3751 lines
103 KiB
C
3751 lines
103 KiB
C
/* $NetBSD: pmap.c,v 1.85 2004/05/16 15:44:10 wiz Exp $ */
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/*-
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* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jeremy Cooper.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* XXX These comments aren't quite accurate. Need to change.
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* The sun3x uses the MC68851 Memory Management Unit, which is built
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* into the CPU. The 68851 maps virtual to physical addresses using
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* a multi-level table lookup, which is stored in the very memory that
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* it maps. The number of levels of lookup is configurable from one
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* to four. In this implementation, we use three, named 'A' through 'C'.
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*
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* The MMU translates virtual addresses into physical addresses by
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* traversing these tables in a process called a 'table walk'. The most
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* significant 7 bits of the Virtual Address ('VA') being translated are
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* used as an index into the level A table, whose base in physical memory
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* is stored in a special MMU register, the 'CPU Root Pointer' or CRP. The
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* address found at that index in the A table is used as the base
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* address for the next table, the B table. The next six bits of the VA are
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* used as an index into the B table, which in turn gives the base address
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* of the third and final C table.
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*
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* The next six bits of the VA are used as an index into the C table to
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* locate a Page Table Entry (PTE). The PTE is a physical address in memory
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* to which the remaining 13 bits of the VA are added, producing the
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* mapped physical address.
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*
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* To map the entire memory space in this manner would require 2114296 bytes
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* of page tables per process - quite expensive. Instead we will
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* allocate a fixed but considerably smaller space for the page tables at
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* the time the VM system is initialized. When the pmap code is asked by
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* the kernel to map a VA to a PA, it allocates tables as needed from this
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* pool. When there are no more tables in the pool, tables are stolen
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* from the oldest mapped entries in the tree. This is only possible
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* because all memory mappings are stored in the kernel memory map
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* structures, independent of the pmap structures. A VA which references
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* one of these invalidated maps will cause a page fault. The kernel
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* will determine that the page fault was caused by a task using a valid
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* VA, but for some reason (which does not concern it), that address was
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* not mapped. It will ask the pmap code to re-map the entry and then
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* it will resume executing the faulting task.
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*
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* In this manner the most efficient use of the page table space is
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* achieved. Tasks which do not execute often will have their tables
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* stolen and reused by tasks which execute more frequently. The best
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* size for the page table pool will probably be determined by
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* experimentation.
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*
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* You read all of the comments so far. Good for you.
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* Now go play!
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*/
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/*** A Note About the 68851 Address Translation Cache
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* The MC68851 has a 64 entry cache, called the Address Translation Cache
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* or 'ATC'. This cache stores the most recently used page descriptors
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* accessed by the MMU when it does translations. Using a marker called a
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* 'task alias' the MMU can store the descriptors from 8 different table
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* spaces concurrently. The task alias is associated with the base
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* address of the level A table of that address space. When an address
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* space is currently active (the CRP currently points to its A table)
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* the only cached descriptors that will be obeyed are ones which have a
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* matching task alias of the current space associated with them.
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*
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* Since the cache is always consulted before any table lookups are done,
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* it is important that it accurately reflect the state of the MMU tables.
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* Whenever a change has been made to a table that has been loaded into
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* the MMU, the code must be sure to flush any cached entries that are
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* affected by the change. These instances are documented in the code at
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* various points.
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*/
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/*** A Note About the Note About the 68851 Address Translation Cache
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* 4 months into this code I discovered that the sun3x does not have
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* a MC68851 chip. Instead, it has a version of this MMU that is part of the
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* the 68030 CPU.
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* All though it behaves very similarly to the 68851, it only has 1 task
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* alias and a 22 entry cache. So sadly (or happily), the first paragraph
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* of the previous note does not apply to the sun3x pmap.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.85 2004/05/16 15:44:10 wiz Exp $");
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#include "opt_ddb.h"
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#include "opt_pmap_debug.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/malloc.h>
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#include <sys/pool.h>
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#include <sys/user.h>
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#include <sys/queue.h>
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#include <sys/kcore.h>
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#include <uvm/uvm.h>
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#include <machine/cpu.h>
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#include <machine/kcore.h>
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#include <machine/mon.h>
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#include <machine/pmap.h>
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#include <machine/pte.h>
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#include <machine/vmparam.h>
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#include <m68k/cacheops.h>
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#include <sun3/sun3/cache.h>
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#include <sun3/sun3/machdep.h>
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#include "pmap_pvt.h"
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/* XXX - What headers declare these? */
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extern struct pcb *curpcb;
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extern int physmem;
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/* Defined in locore.s */
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extern char kernel_text[];
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/* Defined by the linker */
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extern char etext[], edata[], end[];
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extern char *esym; /* DDB */
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/*************************** DEBUGGING DEFINITIONS ***********************
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* Macros, preprocessor defines and variables used in debugging can make *
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* code hard to read. Anything used exclusively for debugging purposes *
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* is defined here to avoid having such mess scattered around the file. *
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*************************************************************************/
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#ifdef PMAP_DEBUG
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/*
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* To aid the debugging process, macros should be expanded into smaller steps
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* that accomplish the same goal, yet provide convenient places for placing
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* breakpoints. When this code is compiled with PMAP_DEBUG mode defined, the
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* 'INLINE' keyword is defined to an empty string. This way, any function
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* defined to be a 'static INLINE' will become 'outlined' and compiled as
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* a separate function, which is much easier to debug.
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*/
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#define INLINE /* nothing */
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/*
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* It is sometimes convenient to watch the activity of a particular table
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* in the system. The following variables are used for that purpose.
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*/
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a_tmgr_t *pmap_watch_atbl = 0;
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b_tmgr_t *pmap_watch_btbl = 0;
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c_tmgr_t *pmap_watch_ctbl = 0;
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int pmap_debug = 0;
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#define DPRINT(args) if (pmap_debug) printf args
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#else /********** Stuff below is defined if NOT debugging **************/
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#define INLINE inline
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#define DPRINT(args) /* nada */
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#endif /* PMAP_DEBUG */
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/*********************** END OF DEBUGGING DEFINITIONS ********************/
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/*** Management Structure - Memory Layout
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* For every MMU table in the sun3x pmap system there must be a way to
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* manage it; we must know which process is using it, what other tables
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* depend on it, and whether or not it contains any locked pages. This
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* is solved by the creation of 'table management' or 'tmgr'
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* structures. One for each MMU table in the system.
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*
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* MAP OF MEMORY USED BY THE PMAP SYSTEM
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*
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* towards lower memory
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* kernAbase -> +-------------------------------------------------------+
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* | Kernel MMU A level table |
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* kernBbase -> +-------------------------------------------------------+
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* | Kernel MMU B level tables |
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* kernCbase -> +-------------------------------------------------------+
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* | |
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* | Kernel MMU C level tables |
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* | |
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* mmuCbase -> +-------------------------------------------------------+
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* | User MMU C level tables |
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* mmuAbase -> +-------------------------------------------------------+
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* | |
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* | User MMU A level tables |
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* | |
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* mmuBbase -> +-------------------------------------------------------+
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* | User MMU B level tables |
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* tmgrAbase -> +-------------------------------------------------------+
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* | TMGR A level table structures |
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* tmgrBbase -> +-------------------------------------------------------+
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* | TMGR B level table structures |
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* tmgrCbase -> +-------------------------------------------------------+
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* | TMGR C level table structures |
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* pvbase -> +-------------------------------------------------------+
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* | Physical to Virtual mapping table (list heads) |
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* pvebase -> +-------------------------------------------------------+
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* | Physical to Virtual mapping table (list elements) |
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* | |
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* +-------------------------------------------------------+
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* towards higher memory
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*
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* For every A table in the MMU A area, there will be a corresponding
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* a_tmgr structure in the TMGR A area. The same will be true for
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* the B and C tables. This arrangement will make it easy to find the
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* controling tmgr structure for any table in the system by use of
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* (relatively) simple macros.
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*/
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/*
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* Global variables for storing the base addresses for the areas
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* labeled above.
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*/
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static vaddr_t kernAphys;
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static mmu_long_dte_t *kernAbase;
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static mmu_short_dte_t *kernBbase;
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static mmu_short_pte_t *kernCbase;
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static mmu_short_pte_t *mmuCbase;
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static mmu_short_dte_t *mmuBbase;
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static mmu_long_dte_t *mmuAbase;
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static a_tmgr_t *Atmgrbase;
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static b_tmgr_t *Btmgrbase;
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static c_tmgr_t *Ctmgrbase;
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static pv_t *pvbase;
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static pv_elem_t *pvebase;
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struct pmap kernel_pmap;
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/*
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* This holds the CRP currently loaded into the MMU.
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*/
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struct mmu_rootptr kernel_crp;
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/*
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* Just all around global variables.
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*/
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static TAILQ_HEAD(a_pool_head_struct, a_tmgr_struct) a_pool;
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static TAILQ_HEAD(b_pool_head_struct, b_tmgr_struct) b_pool;
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static TAILQ_HEAD(c_pool_head_struct, c_tmgr_struct) c_pool;
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/*
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* Flags used to mark the safety/availability of certain operations or
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* resources.
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*/
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static boolean_t bootstrap_alloc_enabled = FALSE; /*Safe to use pmap_bootstrap_alloc().*/
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int tmp_vpages_inuse; /* Temporary virtual pages are in use */
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/*
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* XXX: For now, retain the traditional variables that were
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* used in the old pmap/vm interface (without NONCONTIG).
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*/
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/* Kernel virtual address space available: */
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vaddr_t virtual_avail, virtual_end;
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/* Physical address space available: */
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paddr_t avail_start, avail_end;
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/* This keep track of the end of the contiguously mapped range. */
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vaddr_t virtual_contig_end;
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/* Physical address used by pmap_next_page() */
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paddr_t avail_next;
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/* These are used by pmap_copy_page(), etc. */
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vaddr_t tmp_vpages[2];
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/* memory pool for pmap structures */
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struct pool pmap_pmap_pool;
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/*
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* The 3/80 is the only member of the sun3x family that has non-contiguous
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* physical memory. Memory is divided into 4 banks which are physically
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* locatable on the system board. Although the size of these banks varies
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* with the size of memory they contain, their base addresses are
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* permenently fixed. The following structure, which describes these
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* banks, is initialized by pmap_bootstrap() after it reads from a similar
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* structure provided by the ROM Monitor.
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*
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* For the other machines in the sun3x architecture which do have contiguous
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* RAM, this list will have only one entry, which will describe the entire
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* range of available memory.
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*/
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struct pmap_physmem_struct avail_mem[SUN3X_NPHYS_RAM_SEGS];
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u_int total_phys_mem;
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/*************************************************************************/
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/*
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* XXX - Should "tune" these based on statistics.
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*
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* My first guess about the relative numbers of these needed is
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* based on the fact that a "typical" process will have several
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* pages mapped at low virtual addresses (text, data, bss), then
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* some mapped shared libraries, and then some stack pages mapped
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* near the high end of the VA space. Each process can use only
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* one A table, and most will use only two B tables (maybe three)
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* and probably about four C tables. Therefore, the first guess
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* at the relative numbers of these needed is 1:2:4 -gwr
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*
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* The number of C tables needed is closely related to the amount
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* of physical memory available plus a certain amount attributable
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* to the use of double mappings. With a few simulation statistics
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* we can find a reasonably good estimation of this unknown value.
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* Armed with that and the above ratios, we have a good idea of what
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* is needed at each level. -j
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*
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* Note: It is not physical memory memory size, but the total mapped
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* virtual space required by the combined working sets of all the
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* currently _runnable_ processes. (Sleeping ones don't count.)
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* The amount of physical memory should be irrelevant. -gwr
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*/
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#ifdef FIXED_NTABLES
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#define NUM_A_TABLES 16
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#define NUM_B_TABLES 32
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#define NUM_C_TABLES 64
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#else
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unsigned int NUM_A_TABLES, NUM_B_TABLES, NUM_C_TABLES;
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#endif /* FIXED_NTABLES */
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/*
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* This determines our total virtual mapping capacity.
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* Yes, it is a FIXED value so we can pre-allocate.
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*/
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#define NUM_USER_PTES (NUM_C_TABLES * MMU_C_TBL_SIZE)
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/*
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* The size of the Kernel Virtual Address Space (KVAS)
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* for purposes of MMU table allocation is -KERNBASE
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* (length from KERNBASE to 0xFFFFffff)
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*/
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#define KVAS_SIZE (-KERNBASE)
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/* Numbers of kernel MMU tables to support KVAS_SIZE. */
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#define KERN_B_TABLES (KVAS_SIZE >> MMU_TIA_SHIFT)
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#define KERN_C_TABLES (KVAS_SIZE >> MMU_TIB_SHIFT)
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#define NUM_KERN_PTES (KVAS_SIZE >> MMU_TIC_SHIFT)
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/*************************** MISCELANEOUS MACROS *************************/
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#define pmap_lock(pmap) simple_lock(&pmap->pm_lock)
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#define pmap_unlock(pmap) simple_unlock(&pmap->pm_lock)
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#define pmap_add_ref(pmap) ++pmap->pm_refcount
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#define pmap_del_ref(pmap) --pmap->pm_refcount
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#define pmap_refcount(pmap) pmap->pm_refcount
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void *pmap_bootstrap_alloc(int);
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static INLINE void *mmu_ptov __P((paddr_t));
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static INLINE paddr_t mmu_vtop __P((void *));
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#if 0
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static INLINE a_tmgr_t * mmuA2tmgr __P((mmu_long_dte_t *));
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#endif /* 0 */
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static INLINE b_tmgr_t * mmuB2tmgr __P((mmu_short_dte_t *));
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static INLINE c_tmgr_t * mmuC2tmgr __P((mmu_short_pte_t *));
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static INLINE pv_t *pa2pv __P((paddr_t));
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static INLINE int pteidx __P((mmu_short_pte_t *));
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static INLINE pmap_t current_pmap __P((void));
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/*
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* We can always convert between virtual and physical addresses
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* for anything in the range [KERNBASE ... avail_start] because
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* that range is GUARANTEED to be mapped linearly.
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* We rely heavily upon this feature!
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*/
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static INLINE void *
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mmu_ptov(pa)
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paddr_t pa;
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{
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vaddr_t va;
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va = (pa + KERNBASE);
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#ifdef PMAP_DEBUG
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if ((va < KERNBASE) || (va >= virtual_contig_end))
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panic("mmu_ptov");
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#endif
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return ((void*)va);
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}
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static INLINE paddr_t
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mmu_vtop(vva)
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void *vva;
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{
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vaddr_t va;
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va = (vaddr_t)vva;
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#ifdef PMAP_DEBUG
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if ((va < KERNBASE) || (va >= virtual_contig_end))
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panic("mmu_vtop");
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#endif
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return (va - KERNBASE);
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}
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/*
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* These macros map MMU tables to their corresponding manager structures.
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* They are needed quite often because many of the pointers in the pmap
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* system reference MMU tables and not the structures that control them.
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* There needs to be a way to find one when given the other and these
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* macros do so by taking advantage of the memory layout described above.
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* Here's a quick step through the first macro, mmuA2tmgr():
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*
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* 1) find the offset of the given MMU A table from the base of its table
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* pool (table - mmuAbase).
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* 2) convert this offset into a table index by dividing it by the
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* size of one MMU 'A' table. (sizeof(mmu_long_dte_t) * MMU_A_TBL_SIZE)
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* 3) use this index to select the corresponding 'A' table manager
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* structure from the 'A' table manager pool (Atmgrbase[index]).
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*/
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/* This function is not currently used. */
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#if 0
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static INLINE a_tmgr_t *
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mmuA2tmgr(mmuAtbl)
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mmu_long_dte_t *mmuAtbl;
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{
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int idx;
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/* Which table is this in? */
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idx = (mmuAtbl - mmuAbase) / MMU_A_TBL_SIZE;
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#ifdef PMAP_DEBUG
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if ((idx < 0) || (idx >= NUM_A_TABLES))
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panic("mmuA2tmgr");
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#endif
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return (&Atmgrbase[idx]);
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}
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#endif /* 0 */
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static INLINE b_tmgr_t *
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mmuB2tmgr(mmuBtbl)
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mmu_short_dte_t *mmuBtbl;
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{
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int idx;
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/* Which table is this in? */
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idx = (mmuBtbl - mmuBbase) / MMU_B_TBL_SIZE;
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#ifdef PMAP_DEBUG
|
|
if ((idx < 0) || (idx >= NUM_B_TABLES))
|
|
panic("mmuB2tmgr");
|
|
#endif
|
|
return (&Btmgrbase[idx]);
|
|
}
|
|
|
|
/* mmuC2tmgr INTERNAL
|
|
**
|
|
* Given a pte known to belong to a C table, return the address of
|
|
* that table's management structure.
|
|
*/
|
|
static INLINE c_tmgr_t *
|
|
mmuC2tmgr(mmuCtbl)
|
|
mmu_short_pte_t *mmuCtbl;
|
|
{
|
|
int idx;
|
|
|
|
/* Which table is this in? */
|
|
idx = (mmuCtbl - mmuCbase) / MMU_C_TBL_SIZE;
|
|
#ifdef PMAP_DEBUG
|
|
if ((idx < 0) || (idx >= NUM_C_TABLES))
|
|
panic("mmuC2tmgr");
|
|
#endif
|
|
return (&Ctmgrbase[idx]);
|
|
}
|
|
|
|
/* This is now a function call below.
|
|
* #define pa2pv(pa) \
|
|
* (&pvbase[(unsigned long)\
|
|
* m68k_btop(pa)\
|
|
* ])
|
|
*/
|
|
|
|
/* pa2pv INTERNAL
|
|
**
|
|
* Return the pv_list_head element which manages the given physical
|
|
* address.
|
|
*/
|
|
static INLINE pv_t *
|
|
pa2pv(pa)
|
|
paddr_t pa;
|
|
{
|
|
struct pmap_physmem_struct *bank;
|
|
int idx;
|
|
|
|
bank = &avail_mem[0];
|
|
while (pa >= bank->pmem_end)
|
|
bank = bank->pmem_next;
|
|
|
|
pa -= bank->pmem_start;
|
|
idx = bank->pmem_pvbase + m68k_btop(pa);
|
|
#ifdef PMAP_DEBUG
|
|
if ((idx < 0) || (idx >= physmem))
|
|
panic("pa2pv");
|
|
#endif
|
|
return &pvbase[idx];
|
|
}
|
|
|
|
/* pteidx INTERNAL
|
|
**
|
|
* Return the index of the given PTE within the entire fixed table of
|
|
* PTEs.
|
|
*/
|
|
static INLINE int
|
|
pteidx(pte)
|
|
mmu_short_pte_t *pte;
|
|
{
|
|
return (pte - kernCbase);
|
|
}
|
|
|
|
/*
|
|
* This just offers a place to put some debugging checks,
|
|
* and reduces the number of places "curlwp" appears...
|
|
*/
|
|
static INLINE pmap_t
|
|
current_pmap()
|
|
{
|
|
struct vmspace *vm;
|
|
struct vm_map *map;
|
|
pmap_t pmap;
|
|
|
|
if (curlwp == NULL)
|
|
pmap = &kernel_pmap;
|
|
else {
|
|
vm = curproc->p_vmspace;
|
|
map = &vm->vm_map;
|
|
pmap = vm_map_pmap(map);
|
|
}
|
|
|
|
return (pmap);
|
|
}
|
|
|
|
|
|
/*************************** FUNCTION DEFINITIONS ************************
|
|
* These appear here merely for the compiler to enforce type checking on *
|
|
* all function calls. *
|
|
*************************************************************************/
|
|
|
|
/** Internal functions
|
|
** Most functions used only within this module are defined in
|
|
** pmap_pvt.h (why not here if used only here?)
|
|
**/
|
|
static void pmap_page_upload __P((void));
|
|
|
|
/** Interface functions
|
|
** - functions required by the Mach VM Pmap interface, with MACHINE_CONTIG
|
|
** defined.
|
|
**/
|
|
void pmap_pinit __P((pmap_t));
|
|
void pmap_release __P((pmap_t));
|
|
|
|
/********************************** CODE ********************************
|
|
* Functions that are called from other parts of the kernel are labeled *
|
|
* as 'INTERFACE' functions. Functions that are only called from *
|
|
* within the pmap module are labeled as 'INTERNAL' functions. *
|
|
* Functions that are internal, but are not (currently) used at all are *
|
|
* labeled 'INTERNAL_X'. *
|
|
************************************************************************/
|
|
|
|
/* pmap_bootstrap INTERNAL
|
|
**
|
|
* Initializes the pmap system. Called at boot time from
|
|
* locore2.c:_vm_init()
|
|
*
|
|
* Reminder: having a pmap_bootstrap_alloc() and also having the VM
|
|
* system implement pmap_steal_memory() is redundant.
|
|
* Don't release this code without removing one or the other!
|
|
*/
|
|
void
|
|
pmap_bootstrap(nextva)
|
|
vaddr_t nextva;
|
|
{
|
|
struct physmemory *membank;
|
|
struct pmap_physmem_struct *pmap_membank;
|
|
vaddr_t va, eva;
|
|
paddr_t pa;
|
|
int b, c, i, j; /* running table counts */
|
|
int size, resvmem;
|
|
|
|
/*
|
|
* This function is called by __bootstrap after it has
|
|
* determined the type of machine and made the appropriate
|
|
* patches to the ROM vectors (XXX- I don't quite know what I meant
|
|
* by that.) It allocates and sets up enough of the pmap system
|
|
* to manage the kernel's address space.
|
|
*/
|
|
|
|
/*
|
|
* Determine the range of kernel virtual and physical
|
|
* space available. Note that we ABSOLUTELY DEPEND on
|
|
* the fact that the first bank of memory (4MB) is
|
|
* mapped linearly to KERNBASE (which we guaranteed in
|
|
* the first instructions of locore.s).
|
|
* That is plenty for our bootstrap work.
|
|
*/
|
|
virtual_avail = m68k_round_page(nextva);
|
|
virtual_contig_end = KERNBASE + 0x400000; /* +4MB */
|
|
virtual_end = VM_MAX_KERNEL_ADDRESS;
|
|
/* Don't need avail_start til later. */
|
|
|
|
/* We may now call pmap_bootstrap_alloc(). */
|
|
bootstrap_alloc_enabled = TRUE;
|
|
|
|
/*
|
|
* This is a somewhat unwrapped loop to deal with
|
|
* copying the PROM's 'phsymem' banks into the pmap's
|
|
* banks. The following is always assumed:
|
|
* 1. There is always at least one bank of memory.
|
|
* 2. There is always a last bank of memory, and its
|
|
* pmem_next member must be set to NULL.
|
|
*/
|
|
membank = romVectorPtr->v_physmemory;
|
|
pmap_membank = avail_mem;
|
|
total_phys_mem = 0;
|
|
|
|
for (;;) { /* break on !membank */
|
|
pmap_membank->pmem_start = membank->address;
|
|
pmap_membank->pmem_end = membank->address + membank->size;
|
|
total_phys_mem += membank->size;
|
|
membank = membank->next;
|
|
if (!membank)
|
|
break;
|
|
/* This silly syntax arises because pmap_membank
|
|
* is really a pre-allocated array, but it is put into
|
|
* use as a linked list.
|
|
*/
|
|
pmap_membank->pmem_next = pmap_membank + 1;
|
|
pmap_membank = pmap_membank->pmem_next;
|
|
}
|
|
/* This is the last element. */
|
|
pmap_membank->pmem_next = NULL;
|
|
|
|
/*
|
|
* Note: total_phys_mem, physmem represent
|
|
* actual physical memory, including that
|
|
* reserved for the PROM monitor.
|
|
*/
|
|
physmem = btoc(total_phys_mem);
|
|
|
|
/*
|
|
* Avail_end is set to the first byte of physical memory
|
|
* after the end of the last bank. We use this only to
|
|
* determine if a physical address is "managed" memory.
|
|
* This address range should be reduced to prevent the
|
|
* physical pages needed by the PROM monitor from being used
|
|
* in the VM system.
|
|
*/
|
|
resvmem = total_phys_mem - *(romVectorPtr->memoryAvail);
|
|
resvmem = m68k_round_page(resvmem);
|
|
avail_end = pmap_membank->pmem_end - resvmem;
|
|
|
|
/*
|
|
* First allocate enough kernel MMU tables to map all
|
|
* of kernel virtual space from KERNBASE to 0xFFFFFFFF.
|
|
* Note: All must be aligned on 256 byte boundaries.
|
|
* Start with the level-A table (one of those).
|
|
*/
|
|
size = sizeof(mmu_long_dte_t) * MMU_A_TBL_SIZE;
|
|
kernAbase = pmap_bootstrap_alloc(size);
|
|
memset(kernAbase, 0, size);
|
|
|
|
/* Now the level-B kernel tables... */
|
|
size = sizeof(mmu_short_dte_t) * MMU_B_TBL_SIZE * KERN_B_TABLES;
|
|
kernBbase = pmap_bootstrap_alloc(size);
|
|
memset(kernBbase, 0, size);
|
|
|
|
/* Now the level-C kernel tables... */
|
|
size = sizeof(mmu_short_pte_t) * MMU_C_TBL_SIZE * KERN_C_TABLES;
|
|
kernCbase = pmap_bootstrap_alloc(size);
|
|
memset(kernCbase, 0, size);
|
|
/*
|
|
* Note: In order for the PV system to work correctly, the kernel
|
|
* and user-level C tables must be allocated contiguously.
|
|
* Nothing should be allocated between here and the allocation of
|
|
* mmuCbase below. XXX: Should do this as one allocation, and
|
|
* then compute a pointer for mmuCbase instead of this...
|
|
*
|
|
* Allocate user MMU tables.
|
|
* These must be contiguous with the preceding.
|
|
*/
|
|
|
|
#ifndef FIXED_NTABLES
|
|
/*
|
|
* The number of user-level C tables that should be allocated is
|
|
* related to the size of physical memory. In general, there should
|
|
* be enough tables to map four times the amount of available RAM.
|
|
* The extra amount is needed because some table space is wasted by
|
|
* fragmentation.
|
|
*/
|
|
NUM_C_TABLES = (total_phys_mem * 4) / (MMU_C_TBL_SIZE * MMU_PAGE_SIZE);
|
|
NUM_B_TABLES = NUM_C_TABLES / 2;
|
|
NUM_A_TABLES = NUM_B_TABLES / 2;
|
|
#endif /* !FIXED_NTABLES */
|
|
|
|
size = sizeof(mmu_short_pte_t) * MMU_C_TBL_SIZE * NUM_C_TABLES;
|
|
mmuCbase = pmap_bootstrap_alloc(size);
|
|
|
|
size = sizeof(mmu_short_dte_t) * MMU_B_TBL_SIZE * NUM_B_TABLES;
|
|
mmuBbase = pmap_bootstrap_alloc(size);
|
|
|
|
size = sizeof(mmu_long_dte_t) * MMU_A_TBL_SIZE * NUM_A_TABLES;
|
|
mmuAbase = pmap_bootstrap_alloc(size);
|
|
|
|
/*
|
|
* Fill in the never-changing part of the kernel tables.
|
|
* For simplicity, the kernel's mappings will be editable as a
|
|
* flat array of page table entries at kernCbase. The
|
|
* higher level 'A' and 'B' tables must be initialized to point
|
|
* to this lower one.
|
|
*/
|
|
b = c = 0;
|
|
|
|
/*
|
|
* Invalidate all mappings below KERNBASE in the A table.
|
|
* This area has already been zeroed out, but it is good
|
|
* practice to explicitly show that we are interpreting
|
|
* it as a list of A table descriptors.
|
|
*/
|
|
for (i = 0; i < MMU_TIA(KERNBASE); i++) {
|
|
kernAbase[i].addr.raw = 0;
|
|
}
|
|
|
|
/*
|
|
* Set up the kernel A and B tables so that they will reference the
|
|
* correct spots in the contiguous table of PTEs allocated for the
|
|
* kernel's virtual memory space.
|
|
*/
|
|
for (i = MMU_TIA(KERNBASE); i < MMU_A_TBL_SIZE; i++) {
|
|
kernAbase[i].attr.raw =
|
|
MMU_LONG_DTE_LU | MMU_LONG_DTE_SUPV | MMU_DT_SHORT;
|
|
kernAbase[i].addr.raw = mmu_vtop(&kernBbase[b]);
|
|
|
|
for (j=0; j < MMU_B_TBL_SIZE; j++) {
|
|
kernBbase[b + j].attr.raw = mmu_vtop(&kernCbase[c])
|
|
| MMU_DT_SHORT;
|
|
c += MMU_C_TBL_SIZE;
|
|
}
|
|
b += MMU_B_TBL_SIZE;
|
|
}
|
|
|
|
pmap_alloc_usermmu(); /* Allocate user MMU tables. */
|
|
pmap_alloc_usertmgr(); /* Allocate user MMU table managers.*/
|
|
pmap_alloc_pv(); /* Allocate physical->virtual map. */
|
|
|
|
/*
|
|
* We are now done with pmap_bootstrap_alloc(). Round up
|
|
* `virtual_avail' to the nearest page, and set the flag
|
|
* to prevent use of pmap_bootstrap_alloc() hereafter.
|
|
*/
|
|
pmap_bootstrap_aalign(PAGE_SIZE);
|
|
bootstrap_alloc_enabled = FALSE;
|
|
|
|
/*
|
|
* Now that we are done with pmap_bootstrap_alloc(), we
|
|
* must save the virtual and physical addresses of the
|
|
* end of the linearly mapped range, which are stored in
|
|
* virtual_contig_end and avail_start, respectively.
|
|
* These variables will never change after this point.
|
|
*/
|
|
virtual_contig_end = virtual_avail;
|
|
avail_start = virtual_avail - KERNBASE;
|
|
|
|
/*
|
|
* `avail_next' is a running pointer used by pmap_next_page() to
|
|
* keep track of the next available physical page to be handed
|
|
* to the VM system during its initialization, in which it
|
|
* asks for physical pages, one at a time.
|
|
*/
|
|
avail_next = avail_start;
|
|
|
|
/*
|
|
* Now allocate some virtual addresses, but not the physical pages
|
|
* behind them. Note that virtual_avail is already page-aligned.
|
|
*
|
|
* tmp_vpages[] is an array of two virtual pages used for temporary
|
|
* kernel mappings in the pmap module to facilitate various physical
|
|
* address-oritented operations.
|
|
*/
|
|
tmp_vpages[0] = virtual_avail;
|
|
virtual_avail += PAGE_SIZE;
|
|
tmp_vpages[1] = virtual_avail;
|
|
virtual_avail += PAGE_SIZE;
|
|
|
|
/** Initialize the PV system **/
|
|
pmap_init_pv();
|
|
|
|
/*
|
|
* Fill in the kernel_pmap structure and kernel_crp.
|
|
*/
|
|
kernAphys = mmu_vtop(kernAbase);
|
|
kernel_pmap.pm_a_tmgr = NULL;
|
|
kernel_pmap.pm_a_phys = kernAphys;
|
|
kernel_pmap.pm_refcount = 1; /* always in use */
|
|
simple_lock_init(&kernel_pmap.pm_lock);
|
|
|
|
kernel_crp.rp_attr = MMU_LONG_DTE_LU | MMU_DT_LONG;
|
|
kernel_crp.rp_addr = kernAphys;
|
|
|
|
/*
|
|
* Now pmap_enter_kernel() may be used safely and will be
|
|
* the main interface used hereafter to modify the kernel's
|
|
* virtual address space. Note that since we are still running
|
|
* under the PROM's address table, none of these table modifications
|
|
* actually take effect until pmap_takeover_mmu() is called.
|
|
*
|
|
* Note: Our tables do NOT have the PROM linear mappings!
|
|
* Only the mappings created here exist in our tables, so
|
|
* remember to map anything we expect to use.
|
|
*/
|
|
va = (vaddr_t)KERNBASE;
|
|
pa = 0;
|
|
|
|
/*
|
|
* The first page of the kernel virtual address space is the msgbuf
|
|
* page. The page attributes (data, non-cached) are set here, while
|
|
* the address is assigned to this global pointer in cpu_startup().
|
|
* It is non-cached, mostly due to paranoia.
|
|
*/
|
|
pmap_enter_kernel(va, pa|PMAP_NC, VM_PROT_ALL);
|
|
va += PAGE_SIZE; pa += PAGE_SIZE;
|
|
|
|
/* Next page is used as the temporary stack. */
|
|
pmap_enter_kernel(va, pa, VM_PROT_ALL);
|
|
va += PAGE_SIZE; pa += PAGE_SIZE;
|
|
|
|
/*
|
|
* Map all of the kernel's text segment as read-only and cacheable.
|
|
* (Cacheable is implied by default). Unfortunately, the last bytes
|
|
* of kernel text and the first bytes of kernel data will often be
|
|
* sharing the same page. Therefore, the last page of kernel text
|
|
* has to be mapped as read/write, to accomodate the data.
|
|
*/
|
|
eva = m68k_trunc_page((vaddr_t)etext);
|
|
for (; va < eva; va += PAGE_SIZE, pa += PAGE_SIZE)
|
|
pmap_enter_kernel(va, pa, VM_PROT_READ|VM_PROT_EXECUTE);
|
|
|
|
/*
|
|
* Map all of the kernel's data as read/write and cacheable.
|
|
* This includes: data, BSS, symbols, and everything in the
|
|
* contiguous memory used by pmap_bootstrap_alloc()
|
|
*/
|
|
for (; pa < avail_start; va += PAGE_SIZE, pa += PAGE_SIZE)
|
|
pmap_enter_kernel(va, pa, VM_PROT_READ|VM_PROT_WRITE);
|
|
|
|
/*
|
|
* At this point we are almost ready to take over the MMU. But first
|
|
* we must save the PROM's address space in our map, as we call its
|
|
* routines and make references to its data later in the kernel.
|
|
*/
|
|
pmap_bootstrap_copyprom();
|
|
pmap_takeover_mmu();
|
|
pmap_bootstrap_setprom();
|
|
|
|
/* Notify the VM system of our page size. */
|
|
uvmexp.pagesize = PAGE_SIZE;
|
|
uvm_setpagesize();
|
|
|
|
pmap_page_upload();
|
|
}
|
|
|
|
|
|
/* pmap_alloc_usermmu INTERNAL
|
|
**
|
|
* Called from pmap_bootstrap() to allocate MMU tables that will
|
|
* eventually be used for user mappings.
|
|
*/
|
|
void
|
|
pmap_alloc_usermmu()
|
|
{
|
|
/* XXX: Moved into caller. */
|
|
}
|
|
|
|
/* pmap_alloc_pv INTERNAL
|
|
**
|
|
* Called from pmap_bootstrap() to allocate the physical
|
|
* to virtual mapping list. Each physical page of memory
|
|
* in the system has a corresponding element in this list.
|
|
*/
|
|
void
|
|
pmap_alloc_pv()
|
|
{
|
|
int i;
|
|
unsigned int total_mem;
|
|
|
|
/*
|
|
* Allocate a pv_head structure for every page of physical
|
|
* memory that will be managed by the system. Since memory on
|
|
* the 3/80 is non-contiguous, we cannot arrive at a total page
|
|
* count by subtraction of the lowest available address from the
|
|
* highest, but rather we have to step through each memory
|
|
* bank and add the number of pages in each to the total.
|
|
*
|
|
* At this time we also initialize the offset of each bank's
|
|
* starting pv_head within the pv_head list so that the physical
|
|
* memory state routines (pmap_is_referenced(),
|
|
* pmap_is_modified(), et al.) can quickly find coresponding
|
|
* pv_heads in spite of the non-contiguity.
|
|
*/
|
|
total_mem = 0;
|
|
for (i = 0; i < SUN3X_NPHYS_RAM_SEGS; i++) {
|
|
avail_mem[i].pmem_pvbase = m68k_btop(total_mem);
|
|
total_mem += avail_mem[i].pmem_end -
|
|
avail_mem[i].pmem_start;
|
|
if (avail_mem[i].pmem_next == NULL)
|
|
break;
|
|
}
|
|
pvbase = (pv_t *) pmap_bootstrap_alloc(sizeof(pv_t) *
|
|
m68k_btop(total_phys_mem));
|
|
}
|
|
|
|
/* pmap_alloc_usertmgr INTERNAL
|
|
**
|
|
* Called from pmap_bootstrap() to allocate the structures which
|
|
* facilitate management of user MMU tables. Each user MMU table
|
|
* in the system has one such structure associated with it.
|
|
*/
|
|
void
|
|
pmap_alloc_usertmgr()
|
|
{
|
|
/* Allocate user MMU table managers */
|
|
/* It would be a lot simpler to just make these BSS, but */
|
|
/* we may want to change their size at boot time... -j */
|
|
Atmgrbase = (a_tmgr_t *) pmap_bootstrap_alloc(sizeof(a_tmgr_t)
|
|
* NUM_A_TABLES);
|
|
Btmgrbase = (b_tmgr_t *) pmap_bootstrap_alloc(sizeof(b_tmgr_t)
|
|
* NUM_B_TABLES);
|
|
Ctmgrbase = (c_tmgr_t *) pmap_bootstrap_alloc(sizeof(c_tmgr_t)
|
|
* NUM_C_TABLES);
|
|
|
|
/*
|
|
* Allocate PV list elements for the physical to virtual
|
|
* mapping system.
|
|
*/
|
|
pvebase = (pv_elem_t *) pmap_bootstrap_alloc(
|
|
sizeof(pv_elem_t) * (NUM_USER_PTES + NUM_KERN_PTES));
|
|
}
|
|
|
|
/* pmap_bootstrap_copyprom() INTERNAL
|
|
**
|
|
* Copy the PROM mappings into our own tables. Note, we
|
|
* can use physical addresses until __bootstrap returns.
|
|
*/
|
|
void
|
|
pmap_bootstrap_copyprom()
|
|
{
|
|
struct sunromvec *romp;
|
|
int *mon_ctbl;
|
|
mmu_short_pte_t *kpte;
|
|
int i, len;
|
|
|
|
romp = romVectorPtr;
|
|
|
|
/*
|
|
* Copy the mappings in SUN3X_MON_KDB_BASE...SUN3X_MONEND
|
|
* Note: mon_ctbl[0] maps SUN3X_MON_KDB_BASE
|
|
*/
|
|
mon_ctbl = *romp->monptaddr;
|
|
i = m68k_btop(SUN3X_MON_KDB_BASE - KERNBASE);
|
|
kpte = &kernCbase[i];
|
|
len = m68k_btop(SUN3X_MONEND - SUN3X_MON_KDB_BASE);
|
|
|
|
for (i = 0; i < len; i++) {
|
|
kpte[i].attr.raw = mon_ctbl[i];
|
|
}
|
|
|
|
/*
|
|
* Copy the mappings at MON_DVMA_BASE (to the end).
|
|
* Note, in here, mon_ctbl[0] maps MON_DVMA_BASE.
|
|
* Actually, we only want the last page, which the
|
|
* PROM has set up for use by the "ie" driver.
|
|
* (The i82686 needs its SCP there.)
|
|
* If we copy all the mappings, pmap_enter_kernel
|
|
* may complain about finding valid PTEs that are
|
|
* not recorded in our PV lists...
|
|
*/
|
|
mon_ctbl = *romp->shadowpteaddr;
|
|
i = m68k_btop(SUN3X_MON_DVMA_BASE - KERNBASE);
|
|
kpte = &kernCbase[i];
|
|
len = m68k_btop(SUN3X_MON_DVMA_SIZE);
|
|
for (i = (len-1); i < len; i++) {
|
|
kpte[i].attr.raw = mon_ctbl[i];
|
|
}
|
|
}
|
|
|
|
/* pmap_takeover_mmu INTERNAL
|
|
**
|
|
* Called from pmap_bootstrap() after it has copied enough of the
|
|
* PROM mappings into the kernel map so that we can use our own
|
|
* MMU table.
|
|
*/
|
|
void
|
|
pmap_takeover_mmu()
|
|
{
|
|
|
|
loadcrp(&kernel_crp);
|
|
}
|
|
|
|
/* pmap_bootstrap_setprom() INTERNAL
|
|
**
|
|
* Set the PROM mappings so it can see kernel space.
|
|
* Note that physical addresses are used here, which
|
|
* we can get away with because this runs with the
|
|
* low 1GB set for transparent translation.
|
|
*/
|
|
void
|
|
pmap_bootstrap_setprom()
|
|
{
|
|
mmu_long_dte_t *mon_dte;
|
|
extern struct mmu_rootptr mon_crp;
|
|
int i;
|
|
|
|
mon_dte = (mmu_long_dte_t *) mon_crp.rp_addr;
|
|
for (i = MMU_TIA(KERNBASE); i < MMU_TIA(KERN_END); i++) {
|
|
mon_dte[i].attr.raw = kernAbase[i].attr.raw;
|
|
mon_dte[i].addr.raw = kernAbase[i].addr.raw;
|
|
}
|
|
}
|
|
|
|
|
|
/* pmap_init INTERFACE
|
|
**
|
|
* Called at the end of vm_init() to set up the pmap system to go
|
|
* into full time operation. All initialization of kernel_pmap
|
|
* should be already done by now, so this should just do things
|
|
* needed for user-level pmaps to work.
|
|
*/
|
|
void
|
|
pmap_init()
|
|
{
|
|
/** Initialize the manager pools **/
|
|
TAILQ_INIT(&a_pool);
|
|
TAILQ_INIT(&b_pool);
|
|
TAILQ_INIT(&c_pool);
|
|
|
|
/**************************************************************
|
|
* Initialize all tmgr structures and MMU tables they manage. *
|
|
**************************************************************/
|
|
/** Initialize A tables **/
|
|
pmap_init_a_tables();
|
|
/** Initialize B tables **/
|
|
pmap_init_b_tables();
|
|
/** Initialize C tables **/
|
|
pmap_init_c_tables();
|
|
|
|
/** Initialize the pmap pools **/
|
|
pool_init(&pmap_pmap_pool, sizeof(struct pmap), 0, 0, 0, "pmappl",
|
|
&pool_allocator_nointr);
|
|
}
|
|
|
|
/* pmap_init_a_tables() INTERNAL
|
|
**
|
|
* Initializes all A managers, their MMU A tables, and inserts
|
|
* them into the A manager pool for use by the system.
|
|
*/
|
|
void
|
|
pmap_init_a_tables()
|
|
{
|
|
int i;
|
|
a_tmgr_t *a_tbl;
|
|
|
|
for (i=0; i < NUM_A_TABLES; i++) {
|
|
/* Select the next available A manager from the pool */
|
|
a_tbl = &Atmgrbase[i];
|
|
|
|
/*
|
|
* Clear its parent entry. Set its wired and valid
|
|
* entry count to zero.
|
|
*/
|
|
a_tbl->at_parent = NULL;
|
|
a_tbl->at_wcnt = a_tbl->at_ecnt = 0;
|
|
|
|
/* Assign it the next available MMU A table from the pool */
|
|
a_tbl->at_dtbl = &mmuAbase[i * MMU_A_TBL_SIZE];
|
|
|
|
/*
|
|
* Initialize the MMU A table with the table in the `proc0',
|
|
* or kernel, mapping. This ensures that every process has
|
|
* the kernel mapped in the top part of its address space.
|
|
*/
|
|
memcpy(a_tbl->at_dtbl, kernAbase, MMU_A_TBL_SIZE *
|
|
sizeof(mmu_long_dte_t));
|
|
|
|
/*
|
|
* Finally, insert the manager into the A pool,
|
|
* making it ready to be used by the system.
|
|
*/
|
|
TAILQ_INSERT_TAIL(&a_pool, a_tbl, at_link);
|
|
}
|
|
}
|
|
|
|
/* pmap_init_b_tables() INTERNAL
|
|
**
|
|
* Initializes all B table managers, their MMU B tables, and
|
|
* inserts them into the B manager pool for use by the system.
|
|
*/
|
|
void
|
|
pmap_init_b_tables()
|
|
{
|
|
int i,j;
|
|
b_tmgr_t *b_tbl;
|
|
|
|
for (i=0; i < NUM_B_TABLES; i++) {
|
|
/* Select the next available B manager from the pool */
|
|
b_tbl = &Btmgrbase[i];
|
|
|
|
b_tbl->bt_parent = NULL; /* clear its parent, */
|
|
b_tbl->bt_pidx = 0; /* parent index, */
|
|
b_tbl->bt_wcnt = 0; /* wired entry count, */
|
|
b_tbl->bt_ecnt = 0; /* valid entry count. */
|
|
|
|
/* Assign it the next available MMU B table from the pool */
|
|
b_tbl->bt_dtbl = &mmuBbase[i * MMU_B_TBL_SIZE];
|
|
|
|
/* Invalidate every descriptor in the table */
|
|
for (j=0; j < MMU_B_TBL_SIZE; j++)
|
|
b_tbl->bt_dtbl[j].attr.raw = MMU_DT_INVALID;
|
|
|
|
/* Insert the manager into the B pool */
|
|
TAILQ_INSERT_TAIL(&b_pool, b_tbl, bt_link);
|
|
}
|
|
}
|
|
|
|
/* pmap_init_c_tables() INTERNAL
|
|
**
|
|
* Initializes all C table managers, their MMU C tables, and
|
|
* inserts them into the C manager pool for use by the system.
|
|
*/
|
|
void
|
|
pmap_init_c_tables()
|
|
{
|
|
int i,j;
|
|
c_tmgr_t *c_tbl;
|
|
|
|
for (i=0; i < NUM_C_TABLES; i++) {
|
|
/* Select the next available C manager from the pool */
|
|
c_tbl = &Ctmgrbase[i];
|
|
|
|
c_tbl->ct_parent = NULL; /* clear its parent, */
|
|
c_tbl->ct_pidx = 0; /* parent index, */
|
|
c_tbl->ct_wcnt = 0; /* wired entry count, */
|
|
c_tbl->ct_ecnt = 0; /* valid entry count, */
|
|
c_tbl->ct_pmap = NULL; /* parent pmap, */
|
|
c_tbl->ct_va = 0; /* base of managed range */
|
|
|
|
/* Assign it the next available MMU C table from the pool */
|
|
c_tbl->ct_dtbl = &mmuCbase[i * MMU_C_TBL_SIZE];
|
|
|
|
for (j=0; j < MMU_C_TBL_SIZE; j++)
|
|
c_tbl->ct_dtbl[j].attr.raw = MMU_DT_INVALID;
|
|
|
|
TAILQ_INSERT_TAIL(&c_pool, c_tbl, ct_link);
|
|
}
|
|
}
|
|
|
|
/* pmap_init_pv() INTERNAL
|
|
**
|
|
* Initializes the Physical to Virtual mapping system.
|
|
*/
|
|
void
|
|
pmap_init_pv()
|
|
{
|
|
int i;
|
|
|
|
/* Initialize every PV head. */
|
|
for (i = 0; i < m68k_btop(total_phys_mem); i++) {
|
|
pvbase[i].pv_idx = PVE_EOL; /* Indicate no mappings */
|
|
pvbase[i].pv_flags = 0; /* Zero out page flags */
|
|
}
|
|
}
|
|
|
|
/* get_a_table INTERNAL
|
|
**
|
|
* Retrieve and return a level A table for use in a user map.
|
|
*/
|
|
a_tmgr_t *
|
|
get_a_table()
|
|
{
|
|
a_tmgr_t *tbl;
|
|
pmap_t pmap;
|
|
|
|
/* Get the top A table in the pool */
|
|
tbl = a_pool.tqh_first;
|
|
if (tbl == NULL) {
|
|
/*
|
|
* XXX - Instead of panicking here and in other get_x_table
|
|
* functions, we do have the option of sleeping on the head of
|
|
* the table pool. Any function which updates the table pool
|
|
* would then issue a wakeup() on the head, thus waking up any
|
|
* processes waiting for a table.
|
|
*
|
|
* Actually, the place to sleep would be when some process
|
|
* asks for a "wired" mapping that would run us short of
|
|
* mapping resources. This design DEPENDS on always having
|
|
* some mapping resources in the pool for stealing, so we
|
|
* must make sure we NEVER let the pool become empty. -gwr
|
|
*/
|
|
panic("get_a_table: out of A tables.");
|
|
}
|
|
|
|
TAILQ_REMOVE(&a_pool, tbl, at_link);
|
|
/*
|
|
* If the table has a non-null parent pointer then it is in use.
|
|
* Forcibly abduct it from its parent and clear its entries.
|
|
* No re-entrancy worries here. This table would not be in the
|
|
* table pool unless it was available for use.
|
|
*
|
|
* Note that the second argument to free_a_table() is FALSE. This
|
|
* indicates that the table should not be relinked into the A table
|
|
* pool. That is a job for the function that called us.
|
|
*/
|
|
if (tbl->at_parent) {
|
|
pmap = tbl->at_parent;
|
|
free_a_table(tbl, FALSE);
|
|
pmap->pm_a_tmgr = NULL;
|
|
pmap->pm_a_phys = kernAphys;
|
|
}
|
|
return tbl;
|
|
}
|
|
|
|
/* get_b_table INTERNAL
|
|
**
|
|
* Return a level B table for use.
|
|
*/
|
|
b_tmgr_t *
|
|
get_b_table()
|
|
{
|
|
b_tmgr_t *tbl;
|
|
|
|
/* See 'get_a_table' for comments. */
|
|
tbl = b_pool.tqh_first;
|
|
if (tbl == NULL)
|
|
panic("get_b_table: out of B tables.");
|
|
TAILQ_REMOVE(&b_pool, tbl, bt_link);
|
|
if (tbl->bt_parent) {
|
|
tbl->bt_parent->at_dtbl[tbl->bt_pidx].attr.raw = MMU_DT_INVALID;
|
|
tbl->bt_parent->at_ecnt--;
|
|
free_b_table(tbl, FALSE);
|
|
}
|
|
return tbl;
|
|
}
|
|
|
|
/* get_c_table INTERNAL
|
|
**
|
|
* Return a level C table for use.
|
|
*/
|
|
c_tmgr_t *
|
|
get_c_table()
|
|
{
|
|
c_tmgr_t *tbl;
|
|
|
|
/* See 'get_a_table' for comments */
|
|
tbl = c_pool.tqh_first;
|
|
if (tbl == NULL)
|
|
panic("get_c_table: out of C tables.");
|
|
TAILQ_REMOVE(&c_pool, tbl, ct_link);
|
|
if (tbl->ct_parent) {
|
|
tbl->ct_parent->bt_dtbl[tbl->ct_pidx].attr.raw = MMU_DT_INVALID;
|
|
tbl->ct_parent->bt_ecnt--;
|
|
free_c_table(tbl, FALSE);
|
|
}
|
|
return tbl;
|
|
}
|
|
|
|
/*
|
|
* The following 'free_table' and 'steal_table' functions are called to
|
|
* detach tables from their current obligations (parents and children) and
|
|
* prepare them for reuse in another mapping.
|
|
*
|
|
* Free_table is used when the calling function will handle the fate
|
|
* of the parent table, such as returning it to the free pool when it has
|
|
* no valid entries. Functions that do not want to handle this should
|
|
* call steal_table, in which the parent table's descriptors and entry
|
|
* count are automatically modified when this table is removed.
|
|
*/
|
|
|
|
/* free_a_table INTERNAL
|
|
**
|
|
* Unmaps the given A table and all child tables from their current
|
|
* mappings. Returns the number of pages that were invalidated.
|
|
* If 'relink' is true, the function will return the table to the head
|
|
* of the available table pool.
|
|
*
|
|
* Cache note: The MC68851 will automatically flush all
|
|
* descriptors derived from a given A table from its
|
|
* Automatic Translation Cache (ATC) if we issue a
|
|
* 'PFLUSHR' instruction with the base address of the
|
|
* table. This function should do, and does so.
|
|
* Note note: We are using an MC68030 - there is no
|
|
* PFLUSHR.
|
|
*/
|
|
int
|
|
free_a_table(a_tbl, relink)
|
|
a_tmgr_t *a_tbl;
|
|
boolean_t relink;
|
|
{
|
|
int i, removed_cnt;
|
|
mmu_long_dte_t *dte;
|
|
mmu_short_dte_t *dtbl;
|
|
b_tmgr_t *tmgr;
|
|
|
|
/*
|
|
* Flush the ATC cache of all cached descriptors derived
|
|
* from this table.
|
|
* Sun3x does not use 68851's cached table feature
|
|
* flush_atc_crp(mmu_vtop(a_tbl->dte));
|
|
*/
|
|
|
|
/*
|
|
* Remove any pending cache flushes that were designated
|
|
* for the pmap this A table belongs to.
|
|
* a_tbl->parent->atc_flushq[0] = 0;
|
|
* Not implemented in sun3x.
|
|
*/
|
|
|
|
/*
|
|
* All A tables in the system should retain a map for the
|
|
* kernel. If the table contains any valid descriptors
|
|
* (other than those for the kernel area), invalidate them all,
|
|
* stopping short of the kernel's entries.
|
|
*/
|
|
removed_cnt = 0;
|
|
if (a_tbl->at_ecnt) {
|
|
dte = a_tbl->at_dtbl;
|
|
for (i=0; i < MMU_TIA(KERNBASE); i++) {
|
|
/*
|
|
* If a table entry points to a valid B table, free
|
|
* it and its children.
|
|
*/
|
|
if (MMU_VALID_DT(dte[i])) {
|
|
/*
|
|
* The following block does several things,
|
|
* from innermost expression to the
|
|
* outermost:
|
|
* 1) It extracts the base (cc 1996)
|
|
* address of the B table pointed
|
|
* to in the A table entry dte[i].
|
|
* 2) It converts this base address into
|
|
* the virtual address it can be
|
|
* accessed with. (all MMU tables point
|
|
* to physical addresses.)
|
|
* 3) It finds the corresponding manager
|
|
* structure which manages this MMU table.
|
|
* 4) It frees the manager structure.
|
|
* (This frees the MMU table and all
|
|
* child tables. See 'free_b_table' for
|
|
* details.)
|
|
*/
|
|
dtbl = mmu_ptov(dte[i].addr.raw);
|
|
tmgr = mmuB2tmgr(dtbl);
|
|
removed_cnt += free_b_table(tmgr, TRUE);
|
|
dte[i].attr.raw = MMU_DT_INVALID;
|
|
}
|
|
}
|
|
a_tbl->at_ecnt = 0;
|
|
}
|
|
if (relink) {
|
|
a_tbl->at_parent = NULL;
|
|
TAILQ_REMOVE(&a_pool, a_tbl, at_link);
|
|
TAILQ_INSERT_HEAD(&a_pool, a_tbl, at_link);
|
|
}
|
|
return removed_cnt;
|
|
}
|
|
|
|
/* free_b_table INTERNAL
|
|
**
|
|
* Unmaps the given B table and all its children from their current
|
|
* mappings. Returns the number of pages that were invalidated.
|
|
* (For comments, see 'free_a_table()').
|
|
*/
|
|
int
|
|
free_b_table(b_tbl, relink)
|
|
b_tmgr_t *b_tbl;
|
|
boolean_t relink;
|
|
{
|
|
int i, removed_cnt;
|
|
mmu_short_dte_t *dte;
|
|
mmu_short_pte_t *dtbl;
|
|
c_tmgr_t *tmgr;
|
|
|
|
removed_cnt = 0;
|
|
if (b_tbl->bt_ecnt) {
|
|
dte = b_tbl->bt_dtbl;
|
|
for (i=0; i < MMU_B_TBL_SIZE; i++) {
|
|
if (MMU_VALID_DT(dte[i])) {
|
|
dtbl = mmu_ptov(MMU_DTE_PA(dte[i]));
|
|
tmgr = mmuC2tmgr(dtbl);
|
|
removed_cnt += free_c_table(tmgr, TRUE);
|
|
dte[i].attr.raw = MMU_DT_INVALID;
|
|
}
|
|
}
|
|
b_tbl->bt_ecnt = 0;
|
|
}
|
|
|
|
if (relink) {
|
|
b_tbl->bt_parent = NULL;
|
|
TAILQ_REMOVE(&b_pool, b_tbl, bt_link);
|
|
TAILQ_INSERT_HEAD(&b_pool, b_tbl, bt_link);
|
|
}
|
|
return removed_cnt;
|
|
}
|
|
|
|
/* free_c_table INTERNAL
|
|
**
|
|
* Unmaps the given C table from use and returns it to the pool for
|
|
* re-use. Returns the number of pages that were invalidated.
|
|
*
|
|
* This function preserves any physical page modification information
|
|
* contained in the page descriptors within the C table by calling
|
|
* 'pmap_remove_pte().'
|
|
*/
|
|
int
|
|
free_c_table(c_tbl, relink)
|
|
c_tmgr_t *c_tbl;
|
|
boolean_t relink;
|
|
{
|
|
int i, removed_cnt;
|
|
|
|
removed_cnt = 0;
|
|
if (c_tbl->ct_ecnt) {
|
|
for (i=0; i < MMU_C_TBL_SIZE; i++) {
|
|
if (MMU_VALID_DT(c_tbl->ct_dtbl[i])) {
|
|
pmap_remove_pte(&c_tbl->ct_dtbl[i]);
|
|
removed_cnt++;
|
|
}
|
|
}
|
|
c_tbl->ct_ecnt = 0;
|
|
}
|
|
|
|
if (relink) {
|
|
c_tbl->ct_parent = NULL;
|
|
TAILQ_REMOVE(&c_pool, c_tbl, ct_link);
|
|
TAILQ_INSERT_HEAD(&c_pool, c_tbl, ct_link);
|
|
}
|
|
return removed_cnt;
|
|
}
|
|
|
|
|
|
/* pmap_remove_pte INTERNAL
|
|
**
|
|
* Unmap the given pte and preserve any page modification
|
|
* information by transfering it to the pv head of the
|
|
* physical page it maps to. This function does not update
|
|
* any reference counts because it is assumed that the calling
|
|
* function will do so.
|
|
*/
|
|
void
|
|
pmap_remove_pte(pte)
|
|
mmu_short_pte_t *pte;
|
|
{
|
|
u_short pv_idx, targ_idx;
|
|
paddr_t pa;
|
|
pv_t *pv;
|
|
|
|
pa = MMU_PTE_PA(*pte);
|
|
if (is_managed(pa)) {
|
|
pv = pa2pv(pa);
|
|
targ_idx = pteidx(pte); /* Index of PTE being removed */
|
|
|
|
/*
|
|
* If the PTE being removed is the first (or only) PTE in
|
|
* the list of PTEs currently mapped to this page, remove the
|
|
* PTE by changing the index found on the PV head. Otherwise
|
|
* a linear search through the list will have to be executed
|
|
* in order to find the PVE which points to the PTE being
|
|
* removed, so that it may be modified to point to its new
|
|
* neighbor.
|
|
*/
|
|
|
|
pv_idx = pv->pv_idx; /* Index of first PTE in PV list */
|
|
if (pv_idx == targ_idx) {
|
|
pv->pv_idx = pvebase[targ_idx].pve_next;
|
|
} else {
|
|
|
|
/*
|
|
* Find the PV element pointing to the target
|
|
* element. Note: may have pv_idx==PVE_EOL
|
|
*/
|
|
|
|
for (;;) {
|
|
if (pv_idx == PVE_EOL) {
|
|
goto pv_not_found;
|
|
}
|
|
if (pvebase[pv_idx].pve_next == targ_idx)
|
|
break;
|
|
pv_idx = pvebase[pv_idx].pve_next;
|
|
}
|
|
|
|
/*
|
|
* At this point, pv_idx is the index of the PV
|
|
* element just before the target element in the list.
|
|
* Unlink the target.
|
|
*/
|
|
|
|
pvebase[pv_idx].pve_next = pvebase[targ_idx].pve_next;
|
|
}
|
|
|
|
/*
|
|
* Save the mod/ref bits of the pte by simply
|
|
* ORing the entire pte onto the pv_flags member
|
|
* of the pv structure.
|
|
* There is no need to use a separate bit pattern
|
|
* for usage information on the pv head than that
|
|
* which is used on the MMU ptes.
|
|
*/
|
|
|
|
pv_not_found:
|
|
pv->pv_flags |= (u_short) pte->attr.raw;
|
|
}
|
|
pte->attr.raw = MMU_DT_INVALID;
|
|
}
|
|
|
|
/* pmap_stroll INTERNAL
|
|
**
|
|
* Retrieve the addresses of all table managers involved in the mapping of
|
|
* the given virtual address. If the table walk completed successfully,
|
|
* return TRUE. If it was only partially successful, return FALSE.
|
|
* The table walk performed by this function is important to many other
|
|
* functions in this module.
|
|
*
|
|
* Note: This function ought to be easier to read.
|
|
*/
|
|
boolean_t
|
|
pmap_stroll(pmap, va, a_tbl, b_tbl, c_tbl, pte, a_idx, b_idx, pte_idx)
|
|
pmap_t pmap;
|
|
vaddr_t va;
|
|
a_tmgr_t **a_tbl;
|
|
b_tmgr_t **b_tbl;
|
|
c_tmgr_t **c_tbl;
|
|
mmu_short_pte_t **pte;
|
|
int *a_idx, *b_idx, *pte_idx;
|
|
{
|
|
mmu_long_dte_t *a_dte; /* A: long descriptor table */
|
|
mmu_short_dte_t *b_dte; /* B: short descriptor table */
|
|
|
|
if (pmap == pmap_kernel())
|
|
return FALSE;
|
|
|
|
/* Does the given pmap have its own A table? */
|
|
*a_tbl = pmap->pm_a_tmgr;
|
|
if (*a_tbl == NULL)
|
|
return FALSE; /* No. Return unknown. */
|
|
/* Does the A table have a valid B table
|
|
* under the corresponding table entry?
|
|
*/
|
|
*a_idx = MMU_TIA(va);
|
|
a_dte = &((*a_tbl)->at_dtbl[*a_idx]);
|
|
if (!MMU_VALID_DT(*a_dte))
|
|
return FALSE; /* No. Return unknown. */
|
|
/* Yes. Extract B table from the A table. */
|
|
*b_tbl = mmuB2tmgr(mmu_ptov(a_dte->addr.raw));
|
|
/* Does the B table have a valid C table
|
|
* under the corresponding table entry?
|
|
*/
|
|
*b_idx = MMU_TIB(va);
|
|
b_dte = &((*b_tbl)->bt_dtbl[*b_idx]);
|
|
if (!MMU_VALID_DT(*b_dte))
|
|
return FALSE; /* No. Return unknown. */
|
|
/* Yes. Extract C table from the B table. */
|
|
*c_tbl = mmuC2tmgr(mmu_ptov(MMU_DTE_PA(*b_dte)));
|
|
*pte_idx = MMU_TIC(va);
|
|
*pte = &((*c_tbl)->ct_dtbl[*pte_idx]);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/* pmap_enter INTERFACE
|
|
**
|
|
* Called by the kernel to map a virtual address
|
|
* to a physical address in the given process map.
|
|
*
|
|
* Note: this function should apply an exclusive lock
|
|
* on the pmap system for its duration. (it certainly
|
|
* would save my hair!!)
|
|
* This function ought to be easier to read.
|
|
*/
|
|
int
|
|
pmap_enter(pmap, va, pa, prot, flags)
|
|
pmap_t pmap;
|
|
vaddr_t va;
|
|
paddr_t pa;
|
|
vm_prot_t prot;
|
|
int flags;
|
|
{
|
|
boolean_t insert, managed; /* Marks the need for PV insertion.*/
|
|
u_short nidx; /* PV list index */
|
|
int mapflags; /* Flags for the mapping (see NOTE1) */
|
|
u_int a_idx, b_idx, pte_idx; /* table indices */
|
|
a_tmgr_t *a_tbl; /* A: long descriptor table manager */
|
|
b_tmgr_t *b_tbl; /* B: short descriptor table manager */
|
|
c_tmgr_t *c_tbl; /* C: short page table manager */
|
|
mmu_long_dte_t *a_dte; /* A: long descriptor table */
|
|
mmu_short_dte_t *b_dte; /* B: short descriptor table */
|
|
mmu_short_pte_t *c_pte; /* C: short page descriptor table */
|
|
pv_t *pv; /* pv list head */
|
|
boolean_t wired; /* is the mapping to be wired? */
|
|
enum {NONE, NEWA, NEWB, NEWC} llevel; /* used at end */
|
|
|
|
if (pmap == pmap_kernel()) {
|
|
pmap_enter_kernel(va, pa, prot);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Determine if the mapping should be wired.
|
|
*/
|
|
wired = ((flags & PMAP_WIRED) != 0);
|
|
|
|
/*
|
|
* NOTE1:
|
|
*
|
|
* On November 13, 1999, someone changed the pmap_enter() API such
|
|
* that it now accepts a 'flags' argument. This new argument
|
|
* contains bit-flags for the architecture-independent (UVM) system to
|
|
* use in signalling certain mapping requirements to the architecture-
|
|
* dependent (pmap) system. The argument it replaces, 'wired', is now
|
|
* one of the flags within it.
|
|
*
|
|
* In addition to flags signaled by the architecture-independent
|
|
* system, parts of the architecture-dependent section of the sun3x
|
|
* kernel pass their own flags in the lower, unused bits of the
|
|
* physical address supplied to this function. These flags are
|
|
* extracted and stored in the temporary variable 'mapflags'.
|
|
*
|
|
* Extract sun3x specific flags from the physical address.
|
|
*/
|
|
mapflags = (pa & ~MMU_PAGE_MASK);
|
|
pa &= MMU_PAGE_MASK;
|
|
|
|
/*
|
|
* Determine if the physical address being mapped is on-board RAM.
|
|
* Any other area of the address space is likely to belong to a
|
|
* device and hence it would be disasterous to cache its contents.
|
|
*/
|
|
if ((managed = is_managed(pa)) == FALSE)
|
|
mapflags |= PMAP_NC;
|
|
|
|
/*
|
|
* For user mappings we walk along the MMU tables of the given
|
|
* pmap, reaching a PTE which describes the virtual page being
|
|
* mapped or changed. If any level of the walk ends in an invalid
|
|
* entry, a table must be allocated and the entry must be updated
|
|
* to point to it.
|
|
* There is a bit of confusion as to whether this code must be
|
|
* re-entrant. For now we will assume it is. To support
|
|
* re-entrancy we must unlink tables from the table pool before
|
|
* we assume we may use them. Tables are re-linked into the pool
|
|
* when we are finished with them at the end of the function.
|
|
* But I don't feel like doing that until we have proof that this
|
|
* needs to be re-entrant.
|
|
* 'llevel' records which tables need to be relinked.
|
|
*/
|
|
llevel = NONE;
|
|
|
|
/*
|
|
* Step 1 - Retrieve the A table from the pmap. If it has no
|
|
* A table, allocate a new one from the available pool.
|
|
*/
|
|
|
|
a_tbl = pmap->pm_a_tmgr;
|
|
if (a_tbl == NULL) {
|
|
/*
|
|
* This pmap does not currently have an A table. Allocate
|
|
* a new one.
|
|
*/
|
|
a_tbl = get_a_table();
|
|
a_tbl->at_parent = pmap;
|
|
|
|
/*
|
|
* Assign this new A table to the pmap, and calculate its
|
|
* physical address so that loadcrp() can be used to make
|
|
* the table active.
|
|
*/
|
|
pmap->pm_a_tmgr = a_tbl;
|
|
pmap->pm_a_phys = mmu_vtop(a_tbl->at_dtbl);
|
|
|
|
/*
|
|
* If the process receiving a new A table is the current
|
|
* process, we are responsible for setting the MMU so that
|
|
* it becomes the current address space. This only adds
|
|
* new mappings, so no need to flush anything.
|
|
*/
|
|
if (pmap == current_pmap()) {
|
|
kernel_crp.rp_addr = pmap->pm_a_phys;
|
|
loadcrp(&kernel_crp);
|
|
}
|
|
|
|
if (!wired)
|
|
llevel = NEWA;
|
|
} else {
|
|
/*
|
|
* Use the A table already allocated for this pmap.
|
|
* Unlink it from the A table pool if necessary.
|
|
*/
|
|
if (wired && !a_tbl->at_wcnt)
|
|
TAILQ_REMOVE(&a_pool, a_tbl, at_link);
|
|
}
|
|
|
|
/*
|
|
* Step 2 - Walk into the B table. If there is no valid B table,
|
|
* allocate one.
|
|
*/
|
|
|
|
a_idx = MMU_TIA(va); /* Calculate the TIA of the VA. */
|
|
a_dte = &a_tbl->at_dtbl[a_idx]; /* Retrieve descriptor from table */
|
|
if (MMU_VALID_DT(*a_dte)) { /* Is the descriptor valid? */
|
|
/* The descriptor is valid. Use the B table it points to. */
|
|
/*************************************
|
|
* a_idx *
|
|
* v *
|
|
* a_tbl -> +-+-+-+-+-+-+-+-+-+-+-+- *
|
|
* | | | | | | | | | | | | *
|
|
* +-+-+-+-+-+-+-+-+-+-+-+- *
|
|
* | *
|
|
* \- b_tbl -> +-+- *
|
|
* | | *
|
|
* +-+- *
|
|
*************************************/
|
|
b_dte = mmu_ptov(a_dte->addr.raw);
|
|
b_tbl = mmuB2tmgr(b_dte);
|
|
|
|
/*
|
|
* If the requested mapping must be wired, but this table
|
|
* being used to map it is not, the table must be removed
|
|
* from the available pool and its wired entry count
|
|
* incremented.
|
|
*/
|
|
if (wired && !b_tbl->bt_wcnt) {
|
|
TAILQ_REMOVE(&b_pool, b_tbl, bt_link);
|
|
a_tbl->at_wcnt++;
|
|
}
|
|
} else {
|
|
/* The descriptor is invalid. Allocate a new B table. */
|
|
b_tbl = get_b_table();
|
|
|
|
/* Point the parent A table descriptor to this new B table. */
|
|
a_dte->addr.raw = mmu_vtop(b_tbl->bt_dtbl);
|
|
a_dte->attr.raw = MMU_LONG_DTE_LU | MMU_DT_SHORT;
|
|
a_tbl->at_ecnt++; /* Update parent's valid entry count */
|
|
|
|
/* Create the necessary back references to the parent table */
|
|
b_tbl->bt_parent = a_tbl;
|
|
b_tbl->bt_pidx = a_idx;
|
|
|
|
/*
|
|
* If this table is to be wired, make sure the parent A table
|
|
* wired count is updated to reflect that it has another wired
|
|
* entry.
|
|
*/
|
|
if (wired)
|
|
a_tbl->at_wcnt++;
|
|
else if (llevel == NONE)
|
|
llevel = NEWB;
|
|
}
|
|
|
|
/*
|
|
* Step 3 - Walk into the C table, if there is no valid C table,
|
|
* allocate one.
|
|
*/
|
|
|
|
b_idx = MMU_TIB(va); /* Calculate the TIB of the VA */
|
|
b_dte = &b_tbl->bt_dtbl[b_idx]; /* Retrieve descriptor from table */
|
|
if (MMU_VALID_DT(*b_dte)) { /* Is the descriptor valid? */
|
|
/* The descriptor is valid. Use the C table it points to. */
|
|
/**************************************
|
|
* c_idx *
|
|
* | v *
|
|
* \- b_tbl -> +-+-+-+-+-+-+-+-+-+-+- *
|
|
* | | | | | | | | | | | *
|
|
* +-+-+-+-+-+-+-+-+-+-+- *
|
|
* | *
|
|
* \- c_tbl -> +-+-- *
|
|
* | | | *
|
|
* +-+-- *
|
|
**************************************/
|
|
c_pte = mmu_ptov(MMU_PTE_PA(*b_dte));
|
|
c_tbl = mmuC2tmgr(c_pte);
|
|
|
|
/* If mapping is wired and table is not */
|
|
if (wired && !c_tbl->ct_wcnt) {
|
|
TAILQ_REMOVE(&c_pool, c_tbl, ct_link);
|
|
b_tbl->bt_wcnt++;
|
|
}
|
|
} else {
|
|
/* The descriptor is invalid. Allocate a new C table. */
|
|
c_tbl = get_c_table();
|
|
|
|
/* Point the parent B table descriptor to this new C table. */
|
|
b_dte->attr.raw = mmu_vtop(c_tbl->ct_dtbl);
|
|
b_dte->attr.raw |= MMU_DT_SHORT;
|
|
b_tbl->bt_ecnt++; /* Update parent's valid entry count */
|
|
|
|
/* Create the necessary back references to the parent table */
|
|
c_tbl->ct_parent = b_tbl;
|
|
c_tbl->ct_pidx = b_idx;
|
|
/*
|
|
* Store the pmap and base virtual managed address for faster
|
|
* retrieval in the PV functions.
|
|
*/
|
|
c_tbl->ct_pmap = pmap;
|
|
c_tbl->ct_va = (va & (MMU_TIA_MASK|MMU_TIB_MASK));
|
|
|
|
/*
|
|
* If this table is to be wired, make sure the parent B table
|
|
* wired count is updated to reflect that it has another wired
|
|
* entry.
|
|
*/
|
|
if (wired)
|
|
b_tbl->bt_wcnt++;
|
|
else if (llevel == NONE)
|
|
llevel = NEWC;
|
|
}
|
|
|
|
/*
|
|
* Step 4 - Deposit a page descriptor (PTE) into the appropriate
|
|
* slot of the C table, describing the PA to which the VA is mapped.
|
|
*/
|
|
|
|
pte_idx = MMU_TIC(va);
|
|
c_pte = &c_tbl->ct_dtbl[pte_idx];
|
|
if (MMU_VALID_DT(*c_pte)) { /* Is the entry currently valid? */
|
|
/*
|
|
* The PTE is currently valid. This particular call
|
|
* is just a synonym for one (or more) of the following
|
|
* operations:
|
|
* change protection of a page
|
|
* change wiring status of a page
|
|
* remove the mapping of a page
|
|
*
|
|
* XXX - Semi critical: This code should unwire the PTE
|
|
* and, possibly, associated parent tables if this is a
|
|
* change wiring operation. Currently it does not.
|
|
*
|
|
* This may be ok if pmap_unwire() is the only
|
|
* interface used to UNWIRE a page.
|
|
*/
|
|
|
|
/* First check if this is a wiring operation. */
|
|
if (wired && (c_pte->attr.raw & MMU_SHORT_PTE_WIRED)) {
|
|
/*
|
|
* The PTE is already wired. To prevent it from being
|
|
* counted as a new wiring operation, reset the 'wired'
|
|
* variable.
|
|
*/
|
|
wired = FALSE;
|
|
}
|
|
|
|
/* Is the new address the same as the old? */
|
|
if (MMU_PTE_PA(*c_pte) == pa) {
|
|
/*
|
|
* Yes, mark that it does not need to be reinserted
|
|
* into the PV list.
|
|
*/
|
|
insert = FALSE;
|
|
|
|
/*
|
|
* Clear all but the modified, referenced and wired
|
|
* bits on the PTE.
|
|
*/
|
|
c_pte->attr.raw &= (MMU_SHORT_PTE_M
|
|
| MMU_SHORT_PTE_USED | MMU_SHORT_PTE_WIRED);
|
|
} else {
|
|
/* No, remove the old entry */
|
|
pmap_remove_pte(c_pte);
|
|
insert = TRUE;
|
|
}
|
|
|
|
/*
|
|
* TLB flush is only necessary if modifying current map.
|
|
* However, in pmap_enter(), the pmap almost always IS
|
|
* the current pmap, so don't even bother to check.
|
|
*/
|
|
TBIS(va);
|
|
} else {
|
|
/*
|
|
* The PTE is invalid. Increment the valid entry count in
|
|
* the C table manager to reflect the addition of a new entry.
|
|
*/
|
|
c_tbl->ct_ecnt++;
|
|
|
|
/* XXX - temporarily make sure the PTE is cleared. */
|
|
c_pte->attr.raw = 0;
|
|
|
|
/* It will also need to be inserted into the PV list. */
|
|
insert = TRUE;
|
|
}
|
|
|
|
/*
|
|
* If page is changing from unwired to wired status, set an unused bit
|
|
* within the PTE to indicate that it is wired. Also increment the
|
|
* wired entry count in the C table manager.
|
|
*/
|
|
if (wired) {
|
|
c_pte->attr.raw |= MMU_SHORT_PTE_WIRED;
|
|
c_tbl->ct_wcnt++;
|
|
}
|
|
|
|
/*
|
|
* Map the page, being careful to preserve modify/reference/wired
|
|
* bits. At this point it is assumed that the PTE either has no bits
|
|
* set, or if there are set bits, they are only modified, reference or
|
|
* wired bits. If not, the following statement will cause erratic
|
|
* behavior.
|
|
*/
|
|
#ifdef PMAP_DEBUG
|
|
if (c_pte->attr.raw & ~(MMU_SHORT_PTE_M |
|
|
MMU_SHORT_PTE_USED | MMU_SHORT_PTE_WIRED)) {
|
|
printf("pmap_enter: junk left in PTE at %p\n", c_pte);
|
|
Debugger();
|
|
}
|
|
#endif
|
|
c_pte->attr.raw |= ((u_long) pa | MMU_DT_PAGE);
|
|
|
|
/*
|
|
* If the mapping should be read-only, set the write protect
|
|
* bit in the PTE.
|
|
*/
|
|
if (!(prot & VM_PROT_WRITE))
|
|
c_pte->attr.raw |= MMU_SHORT_PTE_WP;
|
|
|
|
/*
|
|
* If the mapping should be cache inhibited (indicated by the flag
|
|
* bits found on the lower order of the physical address.)
|
|
* mark the PTE as a cache inhibited page.
|
|
*/
|
|
if (mapflags & PMAP_NC)
|
|
c_pte->attr.raw |= MMU_SHORT_PTE_CI;
|
|
|
|
/*
|
|
* If the physical address being mapped is managed by the PV
|
|
* system then link the pte into the list of pages mapped to that
|
|
* address.
|
|
*/
|
|
if (insert && managed) {
|
|
pv = pa2pv(pa);
|
|
nidx = pteidx(c_pte);
|
|
|
|
pvebase[nidx].pve_next = pv->pv_idx;
|
|
pv->pv_idx = nidx;
|
|
}
|
|
|
|
/* Move any allocated tables back into the active pool. */
|
|
|
|
switch (llevel) {
|
|
case NEWA:
|
|
TAILQ_INSERT_TAIL(&a_pool, a_tbl, at_link);
|
|
/* FALLTHROUGH */
|
|
case NEWB:
|
|
TAILQ_INSERT_TAIL(&b_pool, b_tbl, bt_link);
|
|
/* FALLTHROUGH */
|
|
case NEWC:
|
|
TAILQ_INSERT_TAIL(&c_pool, c_tbl, ct_link);
|
|
/* FALLTHROUGH */
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* pmap_enter_kernel INTERNAL
|
|
**
|
|
* Map the given virtual address to the given physical address within the
|
|
* kernel address space. This function exists because the kernel map does
|
|
* not do dynamic table allocation. It consists of a contiguous array of ptes
|
|
* and can be edited directly without the need to walk through any tables.
|
|
*
|
|
* XXX: "Danger, Will Robinson!"
|
|
* Note that the kernel should never take a fault on any page
|
|
* between [ KERNBASE .. virtual_avail ] and this is checked in
|
|
* trap.c for kernel-mode MMU faults. This means that mappings
|
|
* created in that range must be implicily wired. -gwr
|
|
*/
|
|
void
|
|
pmap_enter_kernel(va, pa, prot)
|
|
vaddr_t va;
|
|
paddr_t pa;
|
|
vm_prot_t prot;
|
|
{
|
|
boolean_t was_valid, insert;
|
|
u_short pte_idx;
|
|
int flags;
|
|
mmu_short_pte_t *pte;
|
|
pv_t *pv;
|
|
paddr_t old_pa;
|
|
|
|
flags = (pa & ~MMU_PAGE_MASK);
|
|
pa &= MMU_PAGE_MASK;
|
|
|
|
if (is_managed(pa))
|
|
insert = TRUE;
|
|
else
|
|
insert = FALSE;
|
|
|
|
/*
|
|
* Calculate the index of the PTE being modified.
|
|
*/
|
|
pte_idx = (u_long) m68k_btop(va - KERNBASE);
|
|
|
|
/* This array is traditionally named "Sysmap" */
|
|
pte = &kernCbase[pte_idx];
|
|
|
|
if (MMU_VALID_DT(*pte)) {
|
|
was_valid = TRUE;
|
|
/*
|
|
* If the PTE already maps a different
|
|
* physical address, umap and pv_unlink.
|
|
*/
|
|
old_pa = MMU_PTE_PA(*pte);
|
|
if (pa != old_pa)
|
|
pmap_remove_pte(pte);
|
|
else {
|
|
/*
|
|
* Old PA and new PA are the same. No need to
|
|
* relink the mapping within the PV list.
|
|
*/
|
|
insert = FALSE;
|
|
|
|
/*
|
|
* Save any mod/ref bits on the PTE.
|
|
*/
|
|
pte->attr.raw &= (MMU_SHORT_PTE_USED|MMU_SHORT_PTE_M);
|
|
}
|
|
} else {
|
|
pte->attr.raw = MMU_DT_INVALID;
|
|
was_valid = FALSE;
|
|
}
|
|
|
|
/*
|
|
* Map the page. Being careful to preserve modified/referenced bits
|
|
* on the PTE.
|
|
*/
|
|
pte->attr.raw |= (pa | MMU_DT_PAGE);
|
|
|
|
if (!(prot & VM_PROT_WRITE)) /* If access should be read-only */
|
|
pte->attr.raw |= MMU_SHORT_PTE_WP;
|
|
if (flags & PMAP_NC)
|
|
pte->attr.raw |= MMU_SHORT_PTE_CI;
|
|
if (was_valid)
|
|
TBIS(va);
|
|
|
|
/*
|
|
* Insert the PTE into the PV system, if need be.
|
|
*/
|
|
if (insert) {
|
|
pv = pa2pv(pa);
|
|
pvebase[pte_idx].pve_next = pv->pv_idx;
|
|
pv->pv_idx = pte_idx;
|
|
}
|
|
}
|
|
|
|
void
|
|
pmap_kenter_pa(va, pa, prot)
|
|
vaddr_t va;
|
|
paddr_t pa;
|
|
vm_prot_t prot;
|
|
{
|
|
mmu_short_pte_t *pte;
|
|
|
|
/* This array is traditionally named "Sysmap" */
|
|
pte = &kernCbase[(u_long)m68k_btop(va - KERNBASE)];
|
|
|
|
KASSERT(!MMU_VALID_DT(*pte));
|
|
pte->attr.raw = MMU_DT_INVALID | MMU_DT_PAGE | (pa & MMU_PAGE_MASK);
|
|
if (!(prot & VM_PROT_WRITE))
|
|
pte->attr.raw |= MMU_SHORT_PTE_WP;
|
|
}
|
|
|
|
void
|
|
pmap_kremove(va, len)
|
|
vaddr_t va;
|
|
vsize_t len;
|
|
{
|
|
int idx, eidx;
|
|
|
|
#ifdef PMAP_DEBUG
|
|
if ((sva & PGOFSET) || (eva & PGOFSET))
|
|
panic("pmap_kremove: alignment");
|
|
#endif
|
|
|
|
idx = m68k_btop(va - KERNBASE);
|
|
eidx = m68k_btop(va + len - KERNBASE);
|
|
|
|
while (idx < eidx) {
|
|
kernCbase[idx++].attr.raw = MMU_DT_INVALID;
|
|
TBIS(va);
|
|
va += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/* pmap_map INTERNAL
|
|
**
|
|
* Map a contiguous range of physical memory into a contiguous range of
|
|
* the kernel virtual address space.
|
|
*
|
|
* Used for device mappings and early mapping of the kernel text/data/bss.
|
|
* Returns the first virtual address beyond the end of the range.
|
|
*/
|
|
vaddr_t
|
|
pmap_map(va, pa, endpa, prot)
|
|
vaddr_t va;
|
|
paddr_t pa;
|
|
paddr_t endpa;
|
|
int prot;
|
|
{
|
|
int sz;
|
|
|
|
sz = endpa - pa;
|
|
do {
|
|
pmap_enter_kernel(va, pa, prot);
|
|
va += PAGE_SIZE;
|
|
pa += PAGE_SIZE;
|
|
sz -= PAGE_SIZE;
|
|
} while (sz > 0);
|
|
pmap_update(pmap_kernel());
|
|
return(va);
|
|
}
|
|
|
|
/* pmap_protect INTERFACE
|
|
**
|
|
* Apply the given protection to the given virtual address range within
|
|
* the given map.
|
|
*
|
|
* It is ok for the protection applied to be stronger than what is
|
|
* specified. We use this to our advantage when the given map has no
|
|
* mapping for the virtual address. By skipping a page when this
|
|
* is discovered, we are effectively applying a protection of VM_PROT_NONE,
|
|
* and therefore do not need to map the page just to apply a protection
|
|
* code. Only pmap_enter() needs to create new mappings if they do not exist.
|
|
*
|
|
* XXX - This function could be speeded up by using pmap_stroll() for inital
|
|
* setup, and then manual scrolling in the for() loop.
|
|
*/
|
|
void
|
|
pmap_protect(pmap, startva, endva, prot)
|
|
pmap_t pmap;
|
|
vaddr_t startva, endva;
|
|
vm_prot_t prot;
|
|
{
|
|
boolean_t iscurpmap;
|
|
int a_idx, b_idx, c_idx;
|
|
a_tmgr_t *a_tbl;
|
|
b_tmgr_t *b_tbl;
|
|
c_tmgr_t *c_tbl;
|
|
mmu_short_pte_t *pte;
|
|
|
|
if (pmap == pmap_kernel()) {
|
|
pmap_protect_kernel(startva, endva, prot);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* In this particular pmap implementation, there are only three
|
|
* types of memory protection: 'all' (read/write/execute),
|
|
* 'read-only' (read/execute) and 'none' (no mapping.)
|
|
* It is not possible for us to treat 'executable' as a separate
|
|
* protection type. Therefore, protection requests that seek to
|
|
* remove execute permission while retaining read or write, and those
|
|
* that make little sense (write-only for example) are ignored.
|
|
*/
|
|
switch (prot) {
|
|
case VM_PROT_NONE:
|
|
/*
|
|
* A request to apply the protection code of
|
|
* 'VM_PROT_NONE' is a synonym for pmap_remove().
|
|
*/
|
|
pmap_remove(pmap, startva, endva);
|
|
return;
|
|
case VM_PROT_EXECUTE:
|
|
case VM_PROT_READ:
|
|
case VM_PROT_READ|VM_PROT_EXECUTE:
|
|
/* continue */
|
|
break;
|
|
case VM_PROT_WRITE:
|
|
case VM_PROT_WRITE|VM_PROT_READ:
|
|
case VM_PROT_WRITE|VM_PROT_EXECUTE:
|
|
case VM_PROT_ALL:
|
|
/* None of these should happen in a sane system. */
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the pmap has no A table, it has no mappings and therefore
|
|
* there is nothing to protect.
|
|
*/
|
|
if ((a_tbl = pmap->pm_a_tmgr) == NULL)
|
|
return;
|
|
|
|
a_idx = MMU_TIA(startva);
|
|
b_idx = MMU_TIB(startva);
|
|
c_idx = MMU_TIC(startva);
|
|
b_tbl = (b_tmgr_t *) c_tbl = NULL;
|
|
|
|
iscurpmap = (pmap == current_pmap());
|
|
while (startva < endva) {
|
|
if (b_tbl || MMU_VALID_DT(a_tbl->at_dtbl[a_idx])) {
|
|
if (b_tbl == NULL) {
|
|
b_tbl = (b_tmgr_t *) a_tbl->at_dtbl[a_idx].addr.raw;
|
|
b_tbl = mmu_ptov((vaddr_t)b_tbl);
|
|
b_tbl = mmuB2tmgr((mmu_short_dte_t *)b_tbl);
|
|
}
|
|
if (c_tbl || MMU_VALID_DT(b_tbl->bt_dtbl[b_idx])) {
|
|
if (c_tbl == NULL) {
|
|
c_tbl = (c_tmgr_t *) MMU_DTE_PA(b_tbl->bt_dtbl[b_idx]);
|
|
c_tbl = mmu_ptov((vaddr_t)c_tbl);
|
|
c_tbl = mmuC2tmgr((mmu_short_pte_t *)c_tbl);
|
|
}
|
|
if (MMU_VALID_DT(c_tbl->ct_dtbl[c_idx])) {
|
|
pte = &c_tbl->ct_dtbl[c_idx];
|
|
/* make the mapping read-only */
|
|
pte->attr.raw |= MMU_SHORT_PTE_WP;
|
|
/*
|
|
* If we just modified the current address space,
|
|
* flush any translations for the modified page from
|
|
* the translation cache and any data from it in the
|
|
* data cache.
|
|
*/
|
|
if (iscurpmap)
|
|
TBIS(startva);
|
|
}
|
|
startva += PAGE_SIZE;
|
|
|
|
if (++c_idx >= MMU_C_TBL_SIZE) { /* exceeded C table? */
|
|
c_tbl = NULL;
|
|
c_idx = 0;
|
|
if (++b_idx >= MMU_B_TBL_SIZE) { /* exceeded B table? */
|
|
b_tbl = NULL;
|
|
b_idx = 0;
|
|
}
|
|
}
|
|
} else { /* C table wasn't valid */
|
|
c_tbl = NULL;
|
|
c_idx = 0;
|
|
startva += MMU_TIB_RANGE;
|
|
if (++b_idx >= MMU_B_TBL_SIZE) { /* exceeded B table? */
|
|
b_tbl = NULL;
|
|
b_idx = 0;
|
|
}
|
|
} /* C table */
|
|
} else { /* B table wasn't valid */
|
|
b_tbl = NULL;
|
|
b_idx = 0;
|
|
startva += MMU_TIA_RANGE;
|
|
a_idx++;
|
|
} /* B table */
|
|
}
|
|
}
|
|
|
|
/* pmap_protect_kernel INTERNAL
|
|
**
|
|
* Apply the given protection code to a kernel address range.
|
|
*/
|
|
void
|
|
pmap_protect_kernel(startva, endva, prot)
|
|
vaddr_t startva, endva;
|
|
vm_prot_t prot;
|
|
{
|
|
vaddr_t va;
|
|
mmu_short_pte_t *pte;
|
|
|
|
pte = &kernCbase[(unsigned long) m68k_btop(startva - KERNBASE)];
|
|
for (va = startva; va < endva; va += PAGE_SIZE, pte++) {
|
|
if (MMU_VALID_DT(*pte)) {
|
|
switch (prot) {
|
|
case VM_PROT_ALL:
|
|
break;
|
|
case VM_PROT_EXECUTE:
|
|
case VM_PROT_READ:
|
|
case VM_PROT_READ|VM_PROT_EXECUTE:
|
|
pte->attr.raw |= MMU_SHORT_PTE_WP;
|
|
break;
|
|
case VM_PROT_NONE:
|
|
/* this is an alias for 'pmap_remove_kernel' */
|
|
pmap_remove_pte(pte);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
/*
|
|
* since this is the kernel, immediately flush any cached
|
|
* descriptors for this address.
|
|
*/
|
|
TBIS(va);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* pmap_unwire INTERFACE
|
|
**
|
|
* Clear the wired attribute of the specified page.
|
|
*
|
|
* This function is called from vm_fault.c to unwire
|
|
* a mapping.
|
|
*/
|
|
void
|
|
pmap_unwire(pmap, va)
|
|
pmap_t pmap;
|
|
vaddr_t va;
|
|
{
|
|
int a_idx, b_idx, c_idx;
|
|
a_tmgr_t *a_tbl;
|
|
b_tmgr_t *b_tbl;
|
|
c_tmgr_t *c_tbl;
|
|
mmu_short_pte_t *pte;
|
|
|
|
/* Kernel mappings always remain wired. */
|
|
if (pmap == pmap_kernel())
|
|
return;
|
|
|
|
/*
|
|
* Walk through the tables. If the walk terminates without
|
|
* a valid PTE then the address wasn't wired in the first place.
|
|
* Return immediately.
|
|
*/
|
|
if (pmap_stroll(pmap, va, &a_tbl, &b_tbl, &c_tbl, &pte, &a_idx,
|
|
&b_idx, &c_idx) == FALSE)
|
|
return;
|
|
|
|
|
|
/* Is the PTE wired? If not, return. */
|
|
if (!(pte->attr.raw & MMU_SHORT_PTE_WIRED))
|
|
return;
|
|
|
|
/* Remove the wiring bit. */
|
|
pte->attr.raw &= ~(MMU_SHORT_PTE_WIRED);
|
|
|
|
/*
|
|
* Decrement the wired entry count in the C table.
|
|
* If it reaches zero the following things happen:
|
|
* 1. The table no longer has any wired entries and is considered
|
|
* unwired.
|
|
* 2. It is placed on the available queue.
|
|
* 3. The parent table's wired entry count is decremented.
|
|
* 4. If it reaches zero, this process repeats at step 1 and
|
|
* stops at after reaching the A table.
|
|
*/
|
|
if (--c_tbl->ct_wcnt == 0) {
|
|
TAILQ_INSERT_TAIL(&c_pool, c_tbl, ct_link);
|
|
if (--b_tbl->bt_wcnt == 0) {
|
|
TAILQ_INSERT_TAIL(&b_pool, b_tbl, bt_link);
|
|
if (--a_tbl->at_wcnt == 0) {
|
|
TAILQ_INSERT_TAIL(&a_pool, a_tbl, at_link);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* pmap_copy INTERFACE
|
|
**
|
|
* Copy the mappings of a range of addresses in one pmap, into
|
|
* the destination address of another.
|
|
*
|
|
* This routine is advisory. Should we one day decide that MMU tables
|
|
* may be shared by more than one pmap, this function should be used to
|
|
* link them together. Until that day however, we do nothing.
|
|
*/
|
|
void
|
|
pmap_copy(pmap_a, pmap_b, dst, len, src)
|
|
pmap_t pmap_a, pmap_b;
|
|
vaddr_t dst;
|
|
vsize_t len;
|
|
vaddr_t src;
|
|
{
|
|
/* not implemented. */
|
|
}
|
|
|
|
/* pmap_copy_page INTERFACE
|
|
**
|
|
* Copy the contents of one physical page into another.
|
|
*
|
|
* This function makes use of two virtual pages allocated in pmap_bootstrap()
|
|
* to map the two specified physical pages into the kernel address space.
|
|
*
|
|
* Note: We could use the transparent translation registers to make the
|
|
* mappings. If we do so, be sure to disable interrupts before using them.
|
|
*/
|
|
void
|
|
pmap_copy_page(srcpa, dstpa)
|
|
paddr_t srcpa, dstpa;
|
|
{
|
|
vaddr_t srcva, dstva;
|
|
int s;
|
|
|
|
srcva = tmp_vpages[0];
|
|
dstva = tmp_vpages[1];
|
|
|
|
s = splvm();
|
|
#ifdef DIAGNOSTIC
|
|
if (tmp_vpages_inuse++)
|
|
panic("pmap_copy_page: temporary vpages are in use.");
|
|
#endif
|
|
|
|
/* Map pages as non-cacheable to avoid cache polution? */
|
|
pmap_kenter_pa(srcva, srcpa, VM_PROT_READ);
|
|
pmap_kenter_pa(dstva, dstpa, VM_PROT_READ|VM_PROT_WRITE);
|
|
|
|
/* Hand-optimized version of bcopy(src, dst, PAGE_SIZE) */
|
|
copypage((char *) srcva, (char *) dstva);
|
|
|
|
pmap_kremove(srcva, PAGE_SIZE);
|
|
pmap_kremove(dstva, PAGE_SIZE);
|
|
|
|
#ifdef DIAGNOSTIC
|
|
--tmp_vpages_inuse;
|
|
#endif
|
|
splx(s);
|
|
}
|
|
|
|
/* pmap_zero_page INTERFACE
|
|
**
|
|
* Zero the contents of the specified physical page.
|
|
*
|
|
* Uses one of the virtual pages allocated in pmap_boostrap()
|
|
* to map the specified page into the kernel address space.
|
|
*/
|
|
void
|
|
pmap_zero_page(dstpa)
|
|
paddr_t dstpa;
|
|
{
|
|
vaddr_t dstva;
|
|
int s;
|
|
|
|
dstva = tmp_vpages[1];
|
|
s = splvm();
|
|
#ifdef DIAGNOSTIC
|
|
if (tmp_vpages_inuse++)
|
|
panic("pmap_zero_page: temporary vpages are in use.");
|
|
#endif
|
|
|
|
/* The comments in pmap_copy_page() above apply here also. */
|
|
pmap_kenter_pa(dstva, dstpa, VM_PROT_READ|VM_PROT_WRITE);
|
|
|
|
/* Hand-optimized version of bzero(ptr, PAGE_SIZE) */
|
|
zeropage((char *) dstva);
|
|
|
|
pmap_kremove(dstva, PAGE_SIZE);
|
|
#ifdef DIAGNOSTIC
|
|
--tmp_vpages_inuse;
|
|
#endif
|
|
splx(s);
|
|
}
|
|
|
|
/* pmap_collect INTERFACE
|
|
**
|
|
* Called from the VM system when we are about to swap out
|
|
* the process using this pmap. This should give up any
|
|
* resources held here, including all its MMU tables.
|
|
*/
|
|
void
|
|
pmap_collect(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
/* XXX - todo... */
|
|
}
|
|
|
|
/* pmap_create INTERFACE
|
|
**
|
|
* Create and return a pmap structure.
|
|
*/
|
|
pmap_t
|
|
pmap_create()
|
|
{
|
|
pmap_t pmap;
|
|
|
|
pmap = pool_get(&pmap_pmap_pool, PR_WAITOK);
|
|
pmap_pinit(pmap);
|
|
return pmap;
|
|
}
|
|
|
|
/* pmap_pinit INTERNAL
|
|
**
|
|
* Initialize a pmap structure.
|
|
*/
|
|
void
|
|
pmap_pinit(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
memset(pmap, 0, sizeof(struct pmap));
|
|
pmap->pm_a_tmgr = NULL;
|
|
pmap->pm_a_phys = kernAphys;
|
|
pmap->pm_refcount = 1;
|
|
simple_lock_init(&pmap->pm_lock);
|
|
}
|
|
|
|
/* pmap_release INTERFACE
|
|
**
|
|
* Release any resources held by the given pmap.
|
|
*
|
|
* This is the reverse analog to pmap_pinit. It does not
|
|
* necessarily mean for the pmap structure to be deallocated,
|
|
* as in pmap_destroy.
|
|
*/
|
|
void
|
|
pmap_release(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
/*
|
|
* As long as the pmap contains no mappings,
|
|
* which always should be the case whenever
|
|
* this function is called, there really should
|
|
* be nothing to do.
|
|
*/
|
|
#ifdef PMAP_DEBUG
|
|
if (pmap == pmap_kernel())
|
|
panic("pmap_release: kernel pmap");
|
|
#endif
|
|
/*
|
|
* XXX - If this pmap has an A table, give it back.
|
|
* The pmap SHOULD be empty by now, and pmap_remove
|
|
* should have already given back the A table...
|
|
* However, I see: pmap->pm_a_tmgr->at_ecnt == 1
|
|
* at this point, which means some mapping was not
|
|
* removed when it should have been. -gwr
|
|
*/
|
|
if (pmap->pm_a_tmgr != NULL) {
|
|
/* First make sure we are not using it! */
|
|
if (kernel_crp.rp_addr == pmap->pm_a_phys) {
|
|
kernel_crp.rp_addr = kernAphys;
|
|
loadcrp(&kernel_crp);
|
|
}
|
|
#ifdef PMAP_DEBUG /* XXX - todo! */
|
|
/* XXX - Now complain... */
|
|
printf("pmap_release: still have table\n");
|
|
Debugger();
|
|
#endif
|
|
free_a_table(pmap->pm_a_tmgr, TRUE);
|
|
pmap->pm_a_tmgr = NULL;
|
|
pmap->pm_a_phys = kernAphys;
|
|
}
|
|
}
|
|
|
|
/* pmap_reference INTERFACE
|
|
**
|
|
* Increment the reference count of a pmap.
|
|
*/
|
|
void
|
|
pmap_reference(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
pmap_lock(pmap);
|
|
pmap_add_ref(pmap);
|
|
pmap_unlock(pmap);
|
|
}
|
|
|
|
/* pmap_dereference INTERNAL
|
|
**
|
|
* Decrease the reference count on the given pmap
|
|
* by one and return the current count.
|
|
*/
|
|
int
|
|
pmap_dereference(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
int rtn;
|
|
|
|
pmap_lock(pmap);
|
|
rtn = pmap_del_ref(pmap);
|
|
pmap_unlock(pmap);
|
|
|
|
return rtn;
|
|
}
|
|
|
|
/* pmap_destroy INTERFACE
|
|
**
|
|
* Decrement a pmap's reference count and delete
|
|
* the pmap if it becomes zero. Will be called
|
|
* only after all mappings have been removed.
|
|
*/
|
|
void
|
|
pmap_destroy(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
if (pmap_dereference(pmap) == 0) {
|
|
pmap_release(pmap);
|
|
pool_put(&pmap_pmap_pool, pmap);
|
|
}
|
|
}
|
|
|
|
/* pmap_is_referenced INTERFACE
|
|
**
|
|
* Determine if the given physical page has been
|
|
* referenced (read from [or written to.])
|
|
*/
|
|
boolean_t
|
|
pmap_is_referenced(pg)
|
|
struct vm_page *pg;
|
|
{
|
|
paddr_t pa = VM_PAGE_TO_PHYS(pg);
|
|
pv_t *pv;
|
|
int idx;
|
|
|
|
/*
|
|
* Check the flags on the pv head. If they are set,
|
|
* return immediately. Otherwise a search must be done.
|
|
*/
|
|
|
|
pv = pa2pv(pa);
|
|
if (pv->pv_flags & PV_FLAGS_USED)
|
|
return TRUE;
|
|
|
|
/*
|
|
* Search through all pv elements pointing
|
|
* to this page and query their reference bits
|
|
*/
|
|
|
|
for (idx = pv->pv_idx; idx != PVE_EOL; idx = pvebase[idx].pve_next) {
|
|
if (MMU_PTE_USED(kernCbase[idx])) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
/* pmap_is_modified INTERFACE
|
|
**
|
|
* Determine if the given physical page has been
|
|
* modified (written to.)
|
|
*/
|
|
boolean_t
|
|
pmap_is_modified(pg)
|
|
struct vm_page *pg;
|
|
{
|
|
paddr_t pa = VM_PAGE_TO_PHYS(pg);
|
|
pv_t *pv;
|
|
int idx;
|
|
|
|
/* see comments in pmap_is_referenced() */
|
|
pv = pa2pv(pa);
|
|
if (pv->pv_flags & PV_FLAGS_MDFY)
|
|
return TRUE;
|
|
|
|
for (idx = pv->pv_idx;
|
|
idx != PVE_EOL;
|
|
idx = pvebase[idx].pve_next) {
|
|
|
|
if (MMU_PTE_MODIFIED(kernCbase[idx])) {
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
return FALSE;
|
|
}
|
|
|
|
/* pmap_page_protect INTERFACE
|
|
**
|
|
* Applies the given protection to all mappings to the given
|
|
* physical page.
|
|
*/
|
|
void
|
|
pmap_page_protect(pg, prot)
|
|
struct vm_page *pg;
|
|
vm_prot_t prot;
|
|
{
|
|
paddr_t pa = VM_PAGE_TO_PHYS(pg);
|
|
pv_t *pv;
|
|
int idx;
|
|
vaddr_t va;
|
|
struct mmu_short_pte_struct *pte;
|
|
c_tmgr_t *c_tbl;
|
|
pmap_t pmap, curpmap;
|
|
|
|
curpmap = current_pmap();
|
|
pv = pa2pv(pa);
|
|
|
|
for (idx = pv->pv_idx; idx != PVE_EOL; idx = pvebase[idx].pve_next) {
|
|
pte = &kernCbase[idx];
|
|
switch (prot) {
|
|
case VM_PROT_ALL:
|
|
/* do nothing */
|
|
break;
|
|
case VM_PROT_EXECUTE:
|
|
case VM_PROT_READ:
|
|
case VM_PROT_READ|VM_PROT_EXECUTE:
|
|
/*
|
|
* Determine the virtual address mapped by
|
|
* the PTE and flush ATC entries if necessary.
|
|
*/
|
|
va = pmap_get_pteinfo(idx, &pmap, &c_tbl);
|
|
pte->attr.raw |= MMU_SHORT_PTE_WP;
|
|
if (pmap == curpmap || pmap == pmap_kernel())
|
|
TBIS(va);
|
|
break;
|
|
case VM_PROT_NONE:
|
|
/* Save the mod/ref bits. */
|
|
pv->pv_flags |= pte->attr.raw;
|
|
/* Invalidate the PTE. */
|
|
pte->attr.raw = MMU_DT_INVALID;
|
|
|
|
/*
|
|
* Update table counts. And flush ATC entries
|
|
* if necessary.
|
|
*/
|
|
va = pmap_get_pteinfo(idx, &pmap, &c_tbl);
|
|
|
|
/*
|
|
* If the PTE belongs to the kernel map,
|
|
* be sure to flush the page it maps.
|
|
*/
|
|
if (pmap == pmap_kernel()) {
|
|
TBIS(va);
|
|
} else {
|
|
/*
|
|
* The PTE belongs to a user map.
|
|
* update the entry count in the C
|
|
* table to which it belongs and flush
|
|
* the ATC if the mapping belongs to
|
|
* the current pmap.
|
|
*/
|
|
c_tbl->ct_ecnt--;
|
|
if (pmap == curpmap)
|
|
TBIS(va);
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the protection code indicates that all mappings to the page
|
|
* be removed, truncate the PV list to zero entries.
|
|
*/
|
|
if (prot == VM_PROT_NONE)
|
|
pv->pv_idx = PVE_EOL;
|
|
}
|
|
|
|
/* pmap_get_pteinfo INTERNAL
|
|
**
|
|
* Called internally to find the pmap and virtual address within that
|
|
* map to which the pte at the given index maps. Also includes the PTE's C
|
|
* table manager.
|
|
*
|
|
* Returns the pmap in the argument provided, and the virtual address
|
|
* by return value.
|
|
*/
|
|
vaddr_t
|
|
pmap_get_pteinfo(idx, pmap, tbl)
|
|
u_int idx;
|
|
pmap_t *pmap;
|
|
c_tmgr_t **tbl;
|
|
{
|
|
vaddr_t va = 0;
|
|
|
|
/*
|
|
* Determine if the PTE is a kernel PTE or a user PTE.
|
|
*/
|
|
if (idx >= NUM_KERN_PTES) {
|
|
/*
|
|
* The PTE belongs to a user mapping.
|
|
*/
|
|
/* XXX: Would like an inline for this to validate idx... */
|
|
*tbl = &Ctmgrbase[(idx - NUM_KERN_PTES) / MMU_C_TBL_SIZE];
|
|
|
|
*pmap = (*tbl)->ct_pmap;
|
|
/*
|
|
* To find the va to which the PTE maps, we first take
|
|
* the table's base virtual address mapping which is stored
|
|
* in ct_va. We then increment this address by a page for
|
|
* every slot skipped until we reach the PTE.
|
|
*/
|
|
va = (*tbl)->ct_va;
|
|
va += m68k_ptob(idx % MMU_C_TBL_SIZE);
|
|
} else {
|
|
/*
|
|
* The PTE belongs to the kernel map.
|
|
*/
|
|
*pmap = pmap_kernel();
|
|
|
|
va = m68k_ptob(idx);
|
|
va += KERNBASE;
|
|
}
|
|
|
|
return va;
|
|
}
|
|
|
|
/* pmap_clear_modify INTERFACE
|
|
**
|
|
* Clear the modification bit on the page at the specified
|
|
* physical address.
|
|
*
|
|
*/
|
|
boolean_t
|
|
pmap_clear_modify(pg)
|
|
struct vm_page *pg;
|
|
{
|
|
paddr_t pa = VM_PAGE_TO_PHYS(pg);
|
|
boolean_t rv;
|
|
|
|
rv = pmap_is_modified(pg);
|
|
pmap_clear_pv(pa, PV_FLAGS_MDFY);
|
|
return rv;
|
|
}
|
|
|
|
/* pmap_clear_reference INTERFACE
|
|
**
|
|
* Clear the referenced bit on the page at the specified
|
|
* physical address.
|
|
*/
|
|
boolean_t
|
|
pmap_clear_reference(pg)
|
|
struct vm_page *pg;
|
|
{
|
|
paddr_t pa = VM_PAGE_TO_PHYS(pg);
|
|
boolean_t rv;
|
|
|
|
rv = pmap_is_referenced(pg);
|
|
pmap_clear_pv(pa, PV_FLAGS_USED);
|
|
return rv;
|
|
}
|
|
|
|
/* pmap_clear_pv INTERNAL
|
|
**
|
|
* Clears the specified flag from the specified physical address.
|
|
* (Used by pmap_clear_modify() and pmap_clear_reference().)
|
|
*
|
|
* Flag is one of:
|
|
* PV_FLAGS_MDFY - Page modified bit.
|
|
* PV_FLAGS_USED - Page used (referenced) bit.
|
|
*
|
|
* This routine must not only clear the flag on the pv list
|
|
* head. It must also clear the bit on every pte in the pv
|
|
* list associated with the address.
|
|
*/
|
|
void
|
|
pmap_clear_pv(pa, flag)
|
|
paddr_t pa;
|
|
int flag;
|
|
{
|
|
pv_t *pv;
|
|
int idx;
|
|
vaddr_t va;
|
|
pmap_t pmap;
|
|
mmu_short_pte_t *pte;
|
|
c_tmgr_t *c_tbl;
|
|
|
|
pv = pa2pv(pa);
|
|
pv->pv_flags &= ~(flag);
|
|
for (idx = pv->pv_idx; idx != PVE_EOL; idx = pvebase[idx].pve_next) {
|
|
pte = &kernCbase[idx];
|
|
pte->attr.raw &= ~(flag);
|
|
|
|
/*
|
|
* The MC68030 MMU will not set the modified or
|
|
* referenced bits on any MMU tables for which it has
|
|
* a cached descriptor with its modify bit set. To insure
|
|
* that it will modify these bits on the PTE during the next
|
|
* time it is written to or read from, we must flush it from
|
|
* the ATC.
|
|
*
|
|
* Ordinarily it is only necessary to flush the descriptor
|
|
* if it is used in the current address space. But since I
|
|
* am not sure that there will always be a notion of
|
|
* 'the current address space' when this function is called,
|
|
* I will skip the test and always flush the address. It
|
|
* does no harm.
|
|
*/
|
|
|
|
va = pmap_get_pteinfo(idx, &pmap, &c_tbl);
|
|
TBIS(va);
|
|
}
|
|
}
|
|
|
|
/* pmap_extract INTERFACE
|
|
**
|
|
* Return the physical address mapped by the virtual address
|
|
* in the specified pmap.
|
|
*
|
|
* Note: this function should also apply an exclusive lock
|
|
* on the pmap system during its duration.
|
|
*/
|
|
boolean_t
|
|
pmap_extract(pmap, va, pap)
|
|
pmap_t pmap;
|
|
vaddr_t va;
|
|
paddr_t *pap;
|
|
{
|
|
int a_idx, b_idx, pte_idx;
|
|
a_tmgr_t *a_tbl;
|
|
b_tmgr_t *b_tbl;
|
|
c_tmgr_t *c_tbl;
|
|
mmu_short_pte_t *c_pte;
|
|
|
|
if (pmap == pmap_kernel())
|
|
return pmap_extract_kernel(va, pap);
|
|
|
|
if (pmap_stroll(pmap, va, &a_tbl, &b_tbl, &c_tbl,
|
|
&c_pte, &a_idx, &b_idx, &pte_idx) == FALSE)
|
|
return FALSE;
|
|
|
|
if (!MMU_VALID_DT(*c_pte))
|
|
return FALSE;
|
|
|
|
if (pap != NULL)
|
|
*pap = MMU_PTE_PA(*c_pte);
|
|
return (TRUE);
|
|
}
|
|
|
|
/* pmap_extract_kernel INTERNAL
|
|
**
|
|
* Extract a translation from the kernel address space.
|
|
*/
|
|
boolean_t
|
|
pmap_extract_kernel(va, pap)
|
|
vaddr_t va;
|
|
paddr_t *pap;
|
|
{
|
|
mmu_short_pte_t *pte;
|
|
|
|
pte = &kernCbase[(u_int) m68k_btop(va - KERNBASE)];
|
|
if (!MMU_VALID_DT(*pte))
|
|
return (FALSE);
|
|
if (pap != NULL)
|
|
*pap = MMU_PTE_PA(*pte);
|
|
return (TRUE);
|
|
}
|
|
|
|
/* pmap_remove_kernel INTERNAL
|
|
**
|
|
* Remove the mapping of a range of virtual addresses from the kernel map.
|
|
* The arguments are already page-aligned.
|
|
*/
|
|
void
|
|
pmap_remove_kernel(sva, eva)
|
|
vaddr_t sva;
|
|
vaddr_t eva;
|
|
{
|
|
int idx, eidx;
|
|
|
|
#ifdef PMAP_DEBUG
|
|
if ((sva & PGOFSET) || (eva & PGOFSET))
|
|
panic("pmap_remove_kernel: alignment");
|
|
#endif
|
|
|
|
idx = m68k_btop(sva - KERNBASE);
|
|
eidx = m68k_btop(eva - KERNBASE);
|
|
|
|
while (idx < eidx) {
|
|
pmap_remove_pte(&kernCbase[idx++]);
|
|
TBIS(sva);
|
|
sva += PAGE_SIZE;
|
|
}
|
|
}
|
|
|
|
/* pmap_remove INTERFACE
|
|
**
|
|
* Remove the mapping of a range of virtual addresses from the given pmap.
|
|
*
|
|
* If the range contains any wired entries, this function will probably create
|
|
* disaster.
|
|
*/
|
|
void
|
|
pmap_remove(pmap, start, end)
|
|
pmap_t pmap;
|
|
vaddr_t start;
|
|
vaddr_t end;
|
|
{
|
|
|
|
if (pmap == pmap_kernel()) {
|
|
pmap_remove_kernel(start, end);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If the pmap doesn't have an A table of its own, it has no mappings
|
|
* that can be removed.
|
|
*/
|
|
if (pmap->pm_a_tmgr == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Remove the specified range from the pmap. If the function
|
|
* returns true, the operation removed all the valid mappings
|
|
* in the pmap and freed its A table. If this happened to the
|
|
* currently loaded pmap, the MMU root pointer must be reloaded
|
|
* with the default 'kernel' map.
|
|
*/
|
|
if (pmap_remove_a(pmap->pm_a_tmgr, start, end)) {
|
|
if (kernel_crp.rp_addr == pmap->pm_a_phys) {
|
|
kernel_crp.rp_addr = kernAphys;
|
|
loadcrp(&kernel_crp);
|
|
/* will do TLB flush below */
|
|
}
|
|
pmap->pm_a_tmgr = NULL;
|
|
pmap->pm_a_phys = kernAphys;
|
|
}
|
|
|
|
/*
|
|
* If we just modified the current address space,
|
|
* make sure to flush the MMU cache.
|
|
*
|
|
* XXX - this could be an unecessarily large flush.
|
|
* XXX - Could decide, based on the size of the VA range
|
|
* to be removed, whether to flush "by pages" or "all".
|
|
*/
|
|
if (pmap == current_pmap())
|
|
TBIAU();
|
|
}
|
|
|
|
/* pmap_remove_a INTERNAL
|
|
**
|
|
* This is function number one in a set of three that removes a range
|
|
* of memory in the most efficient manner by removing the highest possible
|
|
* tables from the memory space. This particular function attempts to remove
|
|
* as many B tables as it can, delegating the remaining fragmented ranges to
|
|
* pmap_remove_b().
|
|
*
|
|
* If the removal operation results in an empty A table, the function returns
|
|
* TRUE.
|
|
*
|
|
* It's ugly but will do for now.
|
|
*/
|
|
boolean_t
|
|
pmap_remove_a(a_tbl, start, end)
|
|
a_tmgr_t *a_tbl;
|
|
vaddr_t start;
|
|
vaddr_t end;
|
|
{
|
|
boolean_t empty;
|
|
int idx;
|
|
vaddr_t nstart, nend;
|
|
b_tmgr_t *b_tbl;
|
|
mmu_long_dte_t *a_dte;
|
|
mmu_short_dte_t *b_dte;
|
|
|
|
/*
|
|
* The following code works with what I call a 'granularity
|
|
* reduction algorithim'. A range of addresses will always have
|
|
* the following properties, which are classified according to
|
|
* how the range relates to the size of the current granularity
|
|
* - an A table entry:
|
|
*
|
|
* 1 2 3 4
|
|
* -+---+---+---+---+---+---+---+-
|
|
* -+---+---+---+---+---+---+---+-
|
|
*
|
|
* A range will always start on a granularity boundary, illustrated
|
|
* by '+' signs in the table above, or it will start at some point
|
|
* inbetween a granularity boundary, as illustrated by point 1.
|
|
* The first step in removing a range of addresses is to remove the
|
|
* range between 1 and 2, the nearest granularity boundary. This
|
|
* job is handled by the section of code governed by the
|
|
* 'if (start < nstart)' statement.
|
|
*
|
|
* A range will always encompass zero or more intergral granules,
|
|
* illustrated by points 2 and 3. Integral granules are easy to
|
|
* remove. The removal of these granules is the second step, and
|
|
* is handled by the code block 'if (nstart < nend)'.
|
|
*
|
|
* Lastly, a range will always end on a granularity boundary,
|
|
* ill. by point 3, or it will fall just beyond one, ill. by point
|
|
* 4. The last step involves removing this range and is handled by
|
|
* the code block 'if (nend < end)'.
|
|
*/
|
|
nstart = MMU_ROUND_UP_A(start);
|
|
nend = MMU_ROUND_A(end);
|
|
|
|
if (start < nstart) {
|
|
/*
|
|
* This block is executed if the range starts between
|
|
* a granularity boundary.
|
|
*
|
|
* First find the DTE which is responsible for mapping
|
|
* the start of the range.
|
|
*/
|
|
idx = MMU_TIA(start);
|
|
a_dte = &a_tbl->at_dtbl[idx];
|
|
|
|
/*
|
|
* If the DTE is valid then delegate the removal of the sub
|
|
* range to pmap_remove_b(), which can remove addresses at
|
|
* a finer granularity.
|
|
*/
|
|
if (MMU_VALID_DT(*a_dte)) {
|
|
b_dte = mmu_ptov(a_dte->addr.raw);
|
|
b_tbl = mmuB2tmgr(b_dte);
|
|
|
|
/*
|
|
* The sub range to be removed starts at the start
|
|
* of the full range we were asked to remove, and ends
|
|
* at the greater of:
|
|
* 1. The end of the full range, -or-
|
|
* 2. The end of the full range, rounded down to the
|
|
* nearest granularity boundary.
|
|
*/
|
|
if (end < nstart)
|
|
empty = pmap_remove_b(b_tbl, start, end);
|
|
else
|
|
empty = pmap_remove_b(b_tbl, start, nstart);
|
|
|
|
/*
|
|
* If the removal resulted in an empty B table,
|
|
* invalidate the DTE that points to it and decrement
|
|
* the valid entry count of the A table.
|
|
*/
|
|
if (empty) {
|
|
a_dte->attr.raw = MMU_DT_INVALID;
|
|
a_tbl->at_ecnt--;
|
|
}
|
|
}
|
|
/*
|
|
* If the DTE is invalid, the address range is already non-
|
|
* existent and can simply be skipped.
|
|
*/
|
|
}
|
|
if (nstart < nend) {
|
|
/*
|
|
* This block is executed if the range spans a whole number
|
|
* multiple of granules (A table entries.)
|
|
*
|
|
* First find the DTE which is responsible for mapping
|
|
* the start of the first granule involved.
|
|
*/
|
|
idx = MMU_TIA(nstart);
|
|
a_dte = &a_tbl->at_dtbl[idx];
|
|
|
|
/*
|
|
* Remove entire sub-granules (B tables) one at a time,
|
|
* until reaching the end of the range.
|
|
*/
|
|
for (; nstart < nend; a_dte++, nstart += MMU_TIA_RANGE)
|
|
if (MMU_VALID_DT(*a_dte)) {
|
|
/*
|
|
* Find the B table manager for the
|
|
* entry and free it.
|
|
*/
|
|
b_dte = mmu_ptov(a_dte->addr.raw);
|
|
b_tbl = mmuB2tmgr(b_dte);
|
|
free_b_table(b_tbl, TRUE);
|
|
|
|
/*
|
|
* Invalidate the DTE that points to the
|
|
* B table and decrement the valid entry
|
|
* count of the A table.
|
|
*/
|
|
a_dte->attr.raw = MMU_DT_INVALID;
|
|
a_tbl->at_ecnt--;
|
|
}
|
|
}
|
|
if (nend < end) {
|
|
/*
|
|
* This block is executed if the range ends beyond a
|
|
* granularity boundary.
|
|
*
|
|
* First find the DTE which is responsible for mapping
|
|
* the start of the nearest (rounded down) granularity
|
|
* boundary.
|
|
*/
|
|
idx = MMU_TIA(nend);
|
|
a_dte = &a_tbl->at_dtbl[idx];
|
|
|
|
/*
|
|
* If the DTE is valid then delegate the removal of the sub
|
|
* range to pmap_remove_b(), which can remove addresses at
|
|
* a finer granularity.
|
|
*/
|
|
if (MMU_VALID_DT(*a_dte)) {
|
|
/*
|
|
* Find the B table manager for the entry
|
|
* and hand it to pmap_remove_b() along with
|
|
* the sub range.
|
|
*/
|
|
b_dte = mmu_ptov(a_dte->addr.raw);
|
|
b_tbl = mmuB2tmgr(b_dte);
|
|
|
|
empty = pmap_remove_b(b_tbl, nend, end);
|
|
|
|
/*
|
|
* If the removal resulted in an empty B table,
|
|
* invalidate the DTE that points to it and decrement
|
|
* the valid entry count of the A table.
|
|
*/
|
|
if (empty) {
|
|
a_dte->attr.raw = MMU_DT_INVALID;
|
|
a_tbl->at_ecnt--;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If there are no more entries in the A table, release it
|
|
* back to the available pool and return TRUE.
|
|
*/
|
|
if (a_tbl->at_ecnt == 0) {
|
|
a_tbl->at_parent = NULL;
|
|
TAILQ_REMOVE(&a_pool, a_tbl, at_link);
|
|
TAILQ_INSERT_HEAD(&a_pool, a_tbl, at_link);
|
|
empty = TRUE;
|
|
} else {
|
|
empty = FALSE;
|
|
}
|
|
|
|
return empty;
|
|
}
|
|
|
|
/* pmap_remove_b INTERNAL
|
|
**
|
|
* Remove a range of addresses from an address space, trying to remove entire
|
|
* C tables if possible.
|
|
*
|
|
* If the operation results in an empty B table, the function returns TRUE.
|
|
*/
|
|
boolean_t
|
|
pmap_remove_b(b_tbl, start, end)
|
|
b_tmgr_t *b_tbl;
|
|
vaddr_t start;
|
|
vaddr_t end;
|
|
{
|
|
boolean_t empty;
|
|
int idx;
|
|
vaddr_t nstart, nend, rstart;
|
|
c_tmgr_t *c_tbl;
|
|
mmu_short_dte_t *b_dte;
|
|
mmu_short_pte_t *c_dte;
|
|
|
|
|
|
nstart = MMU_ROUND_UP_B(start);
|
|
nend = MMU_ROUND_B(end);
|
|
|
|
if (start < nstart) {
|
|
idx = MMU_TIB(start);
|
|
b_dte = &b_tbl->bt_dtbl[idx];
|
|
if (MMU_VALID_DT(*b_dte)) {
|
|
c_dte = mmu_ptov(MMU_DTE_PA(*b_dte));
|
|
c_tbl = mmuC2tmgr(c_dte);
|
|
if (end < nstart)
|
|
empty = pmap_remove_c(c_tbl, start, end);
|
|
else
|
|
empty = pmap_remove_c(c_tbl, start, nstart);
|
|
if (empty) {
|
|
b_dte->attr.raw = MMU_DT_INVALID;
|
|
b_tbl->bt_ecnt--;
|
|
}
|
|
}
|
|
}
|
|
if (nstart < nend) {
|
|
idx = MMU_TIB(nstart);
|
|
b_dte = &b_tbl->bt_dtbl[idx];
|
|
rstart = nstart;
|
|
while (rstart < nend) {
|
|
if (MMU_VALID_DT(*b_dte)) {
|
|
c_dte = mmu_ptov(MMU_DTE_PA(*b_dte));
|
|
c_tbl = mmuC2tmgr(c_dte);
|
|
free_c_table(c_tbl, TRUE);
|
|
b_dte->attr.raw = MMU_DT_INVALID;
|
|
b_tbl->bt_ecnt--;
|
|
}
|
|
b_dte++;
|
|
rstart += MMU_TIB_RANGE;
|
|
}
|
|
}
|
|
if (nend < end) {
|
|
idx = MMU_TIB(nend);
|
|
b_dte = &b_tbl->bt_dtbl[idx];
|
|
if (MMU_VALID_DT(*b_dte)) {
|
|
c_dte = mmu_ptov(MMU_DTE_PA(*b_dte));
|
|
c_tbl = mmuC2tmgr(c_dte);
|
|
empty = pmap_remove_c(c_tbl, nend, end);
|
|
if (empty) {
|
|
b_dte->attr.raw = MMU_DT_INVALID;
|
|
b_tbl->bt_ecnt--;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (b_tbl->bt_ecnt == 0) {
|
|
b_tbl->bt_parent = NULL;
|
|
TAILQ_REMOVE(&b_pool, b_tbl, bt_link);
|
|
TAILQ_INSERT_HEAD(&b_pool, b_tbl, bt_link);
|
|
empty = TRUE;
|
|
} else {
|
|
empty = FALSE;
|
|
}
|
|
|
|
return empty;
|
|
}
|
|
|
|
/* pmap_remove_c INTERNAL
|
|
**
|
|
* Remove a range of addresses from the given C table.
|
|
*/
|
|
boolean_t
|
|
pmap_remove_c(c_tbl, start, end)
|
|
c_tmgr_t *c_tbl;
|
|
vaddr_t start;
|
|
vaddr_t end;
|
|
{
|
|
boolean_t empty;
|
|
int idx;
|
|
mmu_short_pte_t *c_pte;
|
|
|
|
idx = MMU_TIC(start);
|
|
c_pte = &c_tbl->ct_dtbl[idx];
|
|
for (;start < end; start += MMU_PAGE_SIZE, c_pte++) {
|
|
if (MMU_VALID_DT(*c_pte)) {
|
|
pmap_remove_pte(c_pte);
|
|
c_tbl->ct_ecnt--;
|
|
}
|
|
}
|
|
|
|
if (c_tbl->ct_ecnt == 0) {
|
|
c_tbl->ct_parent = NULL;
|
|
TAILQ_REMOVE(&c_pool, c_tbl, ct_link);
|
|
TAILQ_INSERT_HEAD(&c_pool, c_tbl, ct_link);
|
|
empty = TRUE;
|
|
} else {
|
|
empty = FALSE;
|
|
}
|
|
|
|
return empty;
|
|
}
|
|
|
|
/* is_managed INTERNAL
|
|
**
|
|
* Determine if the given physical address is managed by the PV system.
|
|
* Note that this logic assumes that no one will ask for the status of
|
|
* addresses which lie in-between the memory banks on the 3/80. If they
|
|
* do so, it will falsely report that it is managed.
|
|
*
|
|
* Note: A "managed" address is one that was reported to the VM system as
|
|
* a "usable page" during system startup. As such, the VM system expects the
|
|
* pmap module to keep an accurate track of the useage of those pages.
|
|
* Any page not given to the VM system at startup does not exist (as far as
|
|
* the VM system is concerned) and is therefore "unmanaged." Examples are
|
|
* those pages which belong to the ROM monitor and the memory allocated before
|
|
* the VM system was started.
|
|
*/
|
|
boolean_t
|
|
is_managed(pa)
|
|
paddr_t pa;
|
|
{
|
|
if (pa >= avail_start && pa < avail_end)
|
|
return TRUE;
|
|
else
|
|
return FALSE;
|
|
}
|
|
|
|
/* pmap_bootstrap_alloc INTERNAL
|
|
**
|
|
* Used internally for memory allocation at startup when malloc is not
|
|
* available. This code will fail once it crosses the first memory
|
|
* bank boundary on the 3/80. Hopefully by then however, the VM system
|
|
* will be in charge of allocation.
|
|
*/
|
|
void *
|
|
pmap_bootstrap_alloc(size)
|
|
int size;
|
|
{
|
|
void *rtn;
|
|
|
|
#ifdef PMAP_DEBUG
|
|
if (bootstrap_alloc_enabled == FALSE) {
|
|
mon_printf("pmap_bootstrap_alloc: disabled\n");
|
|
sunmon_abort();
|
|
}
|
|
#endif
|
|
|
|
rtn = (void *) virtual_avail;
|
|
virtual_avail += size;
|
|
|
|
#ifdef PMAP_DEBUG
|
|
if (virtual_avail > virtual_contig_end) {
|
|
mon_printf("pmap_bootstrap_alloc: out of mem\n");
|
|
sunmon_abort();
|
|
}
|
|
#endif
|
|
|
|
return rtn;
|
|
}
|
|
|
|
/* pmap_bootstap_aalign INTERNAL
|
|
**
|
|
* Used to insure that the next call to pmap_bootstrap_alloc() will
|
|
* return a chunk of memory aligned to the specified size.
|
|
*
|
|
* Note: This function will only support alignment sizes that are powers
|
|
* of two.
|
|
*/
|
|
void
|
|
pmap_bootstrap_aalign(size)
|
|
int size;
|
|
{
|
|
int off;
|
|
|
|
off = virtual_avail & (size - 1);
|
|
if (off) {
|
|
(void) pmap_bootstrap_alloc(size - off);
|
|
}
|
|
}
|
|
|
|
/* pmap_pa_exists
|
|
**
|
|
* Used by the /dev/mem driver to see if a given PA is memory
|
|
* that can be mapped. (The PA is not in a hole.)
|
|
*/
|
|
int
|
|
pmap_pa_exists(pa)
|
|
paddr_t pa;
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < SUN3X_NPHYS_RAM_SEGS; i++) {
|
|
if ((pa >= avail_mem[i].pmem_start) &&
|
|
(pa < avail_mem[i].pmem_end))
|
|
return (1);
|
|
if (avail_mem[i].pmem_next == NULL)
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/* Called only from locore.s and pmap.c */
|
|
void _pmap_switch __P((pmap_t pmap));
|
|
|
|
/*
|
|
* _pmap_switch INTERNAL
|
|
*
|
|
* This is called by locore.s:cpu_switch() when it is
|
|
* switching to a new process. Load new translations.
|
|
* Note: done in-line by locore.s unless PMAP_DEBUG
|
|
*
|
|
* Note that we do NOT allocate a context here, but
|
|
* share the "kernel only" context until we really
|
|
* need our own context for user-space mappings in
|
|
* pmap_enter_user(). [ s/context/mmu A table/ ]
|
|
*/
|
|
void
|
|
_pmap_switch(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
u_long rootpa;
|
|
|
|
/*
|
|
* Only do reload/flush if we have to.
|
|
* Note that if the old and new process
|
|
* were BOTH using the "null" context,
|
|
* then this will NOT flush the TLB.
|
|
*/
|
|
rootpa = pmap->pm_a_phys;
|
|
if (kernel_crp.rp_addr != rootpa) {
|
|
DPRINT(("pmap_activate(%p)\n", pmap));
|
|
kernel_crp.rp_addr = rootpa;
|
|
loadcrp(&kernel_crp);
|
|
TBIAU();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Exported version of pmap_activate(). This is called from the
|
|
* machine-independent VM code when a process is given a new pmap.
|
|
* If (p == curlwp) do like cpu_switch would do; otherwise just
|
|
* take this as notification that the process has a new pmap.
|
|
*/
|
|
void
|
|
pmap_activate(l)
|
|
struct lwp *l;
|
|
{
|
|
if (l->l_proc == curproc) {
|
|
_pmap_switch(l->l_proc->p_vmspace->vm_map.pmap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pmap_deactivate INTERFACE
|
|
**
|
|
* This is called to deactivate the specified process's address space.
|
|
*/
|
|
void
|
|
pmap_deactivate(l)
|
|
struct lwp *l;
|
|
{
|
|
/* Nothing to do. */
|
|
}
|
|
|
|
/*
|
|
* Fill in the sun3x-specific part of the kernel core header
|
|
* for dumpsys(). (See machdep.c for the rest.)
|
|
*/
|
|
void
|
|
pmap_kcore_hdr(sh)
|
|
struct sun3x_kcore_hdr *sh;
|
|
{
|
|
u_long spa, len;
|
|
int i;
|
|
|
|
sh->pg_frame = MMU_SHORT_PTE_BASEADDR;
|
|
sh->pg_valid = MMU_DT_PAGE;
|
|
sh->contig_end = virtual_contig_end;
|
|
sh->kernCbase = (u_long)kernCbase;
|
|
for (i = 0; i < SUN3X_NPHYS_RAM_SEGS; i++) {
|
|
spa = avail_mem[i].pmem_start;
|
|
spa = m68k_trunc_page(spa);
|
|
len = avail_mem[i].pmem_end - spa;
|
|
len = m68k_round_page(len);
|
|
sh->ram_segs[i].start = spa;
|
|
sh->ram_segs[i].size = len;
|
|
}
|
|
}
|
|
|
|
|
|
/* pmap_virtual_space INTERFACE
|
|
**
|
|
* Return the current available range of virtual addresses in the
|
|
* arguuments provided. Only really called once.
|
|
*/
|
|
void
|
|
pmap_virtual_space(vstart, vend)
|
|
vaddr_t *vstart, *vend;
|
|
{
|
|
*vstart = virtual_avail;
|
|
*vend = virtual_end;
|
|
}
|
|
|
|
/*
|
|
* Provide memory to the VM system.
|
|
*
|
|
* Assume avail_start is always in the
|
|
* first segment as pmap_bootstrap does.
|
|
*/
|
|
static void
|
|
pmap_page_upload()
|
|
{
|
|
paddr_t a, b; /* memory range */
|
|
int i;
|
|
|
|
/* Supply the memory in segments. */
|
|
for (i = 0; i < SUN3X_NPHYS_RAM_SEGS; i++) {
|
|
a = atop(avail_mem[i].pmem_start);
|
|
b = atop(avail_mem[i].pmem_end);
|
|
if (i == 0)
|
|
a = atop(avail_start);
|
|
if (avail_mem[i].pmem_end > avail_end)
|
|
b = atop(avail_end);
|
|
|
|
uvm_page_physload(a, b, a, b, VM_FREELIST_DEFAULT);
|
|
|
|
if (avail_mem[i].pmem_next == NULL)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* pmap_count INTERFACE
|
|
**
|
|
* Return the number of resident (valid) pages in the given pmap.
|
|
*
|
|
* Note: If this function is handed the kernel map, it will report
|
|
* that it has no mappings. Hopefully the VM system won't ask for kernel
|
|
* map statistics.
|
|
*/
|
|
segsz_t
|
|
pmap_count(pmap, type)
|
|
pmap_t pmap;
|
|
int type;
|
|
{
|
|
u_int count;
|
|
int a_idx, b_idx;
|
|
a_tmgr_t *a_tbl;
|
|
b_tmgr_t *b_tbl;
|
|
c_tmgr_t *c_tbl;
|
|
|
|
/*
|
|
* If the pmap does not have its own A table manager, it has no
|
|
* valid entires.
|
|
*/
|
|
if (pmap->pm_a_tmgr == NULL)
|
|
return 0;
|
|
|
|
a_tbl = pmap->pm_a_tmgr;
|
|
|
|
count = 0;
|
|
for (a_idx = 0; a_idx < MMU_TIA(KERNBASE); a_idx++) {
|
|
if (MMU_VALID_DT(a_tbl->at_dtbl[a_idx])) {
|
|
b_tbl = mmuB2tmgr(mmu_ptov(a_tbl->at_dtbl[a_idx].addr.raw));
|
|
for (b_idx = 0; b_idx < MMU_B_TBL_SIZE; b_idx++) {
|
|
if (MMU_VALID_DT(b_tbl->bt_dtbl[b_idx])) {
|
|
c_tbl = mmuC2tmgr(
|
|
mmu_ptov(MMU_DTE_PA(b_tbl->bt_dtbl[b_idx])));
|
|
if (type == 0)
|
|
/*
|
|
* A resident entry count has been requested.
|
|
*/
|
|
count += c_tbl->ct_ecnt;
|
|
else
|
|
/*
|
|
* A wired entry count has been requested.
|
|
*/
|
|
count += c_tbl->ct_wcnt;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
/************************ SUN3 COMPATIBILITY ROUTINES ********************
|
|
* The following routines are only used by DDB for tricky kernel text *
|
|
* text operations in db_memrw.c. They are provided for sun3 *
|
|
* compatibility. *
|
|
*************************************************************************/
|
|
/* get_pte INTERNAL
|
|
**
|
|
* Return the page descriptor the describes the kernel mapping
|
|
* of the given virtual address.
|
|
*/
|
|
extern u_long ptest_addr __P((u_long)); /* XXX: locore.s */
|
|
u_int
|
|
get_pte(va)
|
|
vaddr_t va;
|
|
{
|
|
u_long pte_pa;
|
|
mmu_short_pte_t *pte;
|
|
|
|
/* Get the physical address of the PTE */
|
|
pte_pa = ptest_addr(va & ~PGOFSET);
|
|
|
|
/* Convert to a virtual address... */
|
|
pte = (mmu_short_pte_t *) (KERNBASE + pte_pa);
|
|
|
|
/* Make sure it is in our level-C tables... */
|
|
if ((pte < kernCbase) ||
|
|
(pte >= &mmuCbase[NUM_USER_PTES]))
|
|
return 0;
|
|
|
|
/* ... and just return its contents. */
|
|
return (pte->attr.raw);
|
|
}
|
|
|
|
|
|
/* set_pte INTERNAL
|
|
**
|
|
* Set the page descriptor that describes the kernel mapping
|
|
* of the given virtual address.
|
|
*/
|
|
void
|
|
set_pte(va, pte)
|
|
vaddr_t va;
|
|
u_int pte;
|
|
{
|
|
u_long idx;
|
|
|
|
if (va < KERNBASE)
|
|
return;
|
|
|
|
idx = (unsigned long) m68k_btop(va - KERNBASE);
|
|
kernCbase[idx].attr.raw = pte;
|
|
TBIS(va);
|
|
}
|
|
|
|
/*
|
|
* Routine: pmap_procwr
|
|
*
|
|
* Function:
|
|
* Synchronize caches corresponding to [addr, addr+len) in p.
|
|
*/
|
|
void
|
|
pmap_procwr(p, va, len)
|
|
struct proc *p;
|
|
vaddr_t va;
|
|
size_t len;
|
|
{
|
|
(void)cachectl1(0x80000004, va, len, p);
|
|
}
|
|
|
|
|
|
#ifdef PMAP_DEBUG
|
|
/************************** DEBUGGING ROUTINES **************************
|
|
* The following routines are meant to be an aid to debugging the pmap *
|
|
* system. They are callable from the DDB command line and should be *
|
|
* prepared to be handed unstable or incomplete states of the system. *
|
|
************************************************************************/
|
|
|
|
/* pv_list
|
|
**
|
|
* List all pages found on the pv list for the given physical page.
|
|
* To avoid endless loops, the listing will stop at the end of the list
|
|
* or after 'n' entries - whichever comes first.
|
|
*/
|
|
void
|
|
pv_list(pa, n)
|
|
paddr_t pa;
|
|
int n;
|
|
{
|
|
int idx;
|
|
vaddr_t va;
|
|
pv_t *pv;
|
|
c_tmgr_t *c_tbl;
|
|
pmap_t pmap;
|
|
|
|
pv = pa2pv(pa);
|
|
idx = pv->pv_idx;
|
|
for (; idx != PVE_EOL && n > 0; idx = pvebase[idx].pve_next, n--) {
|
|
va = pmap_get_pteinfo(idx, &pmap, &c_tbl);
|
|
printf("idx %d, pmap 0x%x, va 0x%x, c_tbl %x\n",
|
|
idx, (u_int) pmap, (u_int) va, (u_int) c_tbl);
|
|
}
|
|
}
|
|
#endif /* PMAP_DEBUG */
|
|
|
|
#ifdef NOT_YET
|
|
/* and maybe not ever */
|
|
/************************** LOW-LEVEL ROUTINES **************************
|
|
* These routines will eventually be re-written into assembly and placed*
|
|
* in locore.s. They are here now as stubs so that the pmap module can *
|
|
* be linked as a standalone user program for testing. *
|
|
************************************************************************/
|
|
/* flush_atc_crp INTERNAL
|
|
**
|
|
* Flush all page descriptors derived from the given CPU Root Pointer
|
|
* (CRP), or 'A' table as it is known here, from the 68851's automatic
|
|
* cache.
|
|
*/
|
|
void
|
|
flush_atc_crp(a_tbl)
|
|
{
|
|
mmu_long_rp_t rp;
|
|
|
|
/* Create a temporary root table pointer that points to the
|
|
* given A table.
|
|
*/
|
|
rp.attr.raw = ~MMU_LONG_RP_LU;
|
|
rp.addr.raw = (unsigned int) a_tbl;
|
|
|
|
mmu_pflushr(&rp);
|
|
/* mmu_pflushr:
|
|
* movel sp(4)@,a0
|
|
* pflushr a0@
|
|
* rts
|
|
*/
|
|
}
|
|
#endif /* NOT_YET */
|