1487 lines
35 KiB
C
1487 lines
35 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department and Ralph Campbell.
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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 University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: @(#)pmap.c 8.4 (Berkeley) 1/26/94
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* $Id: pmap.c,v 1.5 1994/05/27 09:03:51 glass Exp $
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*/
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/*
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* Manages physical address maps.
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*
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* In addition to hardware address maps, this
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* module is called upon to provide software-use-only
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* maps which may or may not be stored in the same
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* form as hardware maps. These pseudo-maps are
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* used to store intermediate results from copy
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* operations to and from address spaces.
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*
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* Since the information managed by this module is
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* also stored by the logical address mapping module,
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* this module may throw away valid virtual-to-physical
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* mappings at almost any time. However, invalidations
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* of virtual-to-physical mappings must be done as
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* requested.
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*
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* In order to cope with hardware architectures which
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* make virtual-to-physical map invalidates expensive,
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* this module may delay invalidate or reduced protection
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* operations until such time as they are actually
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* necessary. This module is given full information as
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* to which processors are currently using which maps,
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* and to when physical maps must be made correct.
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*/
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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/user.h>
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#include <sys/buf.h>
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#ifdef SYSVSHM
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#include <sys/shm.h>
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#endif
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#include <vm/vm_kern.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <machine/machConst.h>
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#include <machine/pte.h>
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extern vm_page_t vm_page_alloc1 __P((void));
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extern void vm_page_free1 __P((vm_page_t));
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/*
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* For each vm_page_t, there is a list of all currently valid virtual
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* mappings of that page. An entry is a pv_entry_t, the list is pv_table.
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* XXX really should do this as a part of the higher level code.
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*/
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typedef struct pv_entry {
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struct pv_entry *pv_next; /* next pv_entry */
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struct pmap *pv_pmap; /* pmap where mapping lies */
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vm_offset_t pv_va; /* virtual address for mapping */
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} *pv_entry_t;
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pv_entry_t pv_table; /* array of entries, one per page */
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extern void pmap_remove_pv();
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#define pa_index(pa) atop((pa) - first_phys_addr)
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#define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
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#ifdef DEBUG
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struct {
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int kernel; /* entering kernel mapping */
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int user; /* entering user mapping */
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int ptpneeded; /* needed to allocate a PT page */
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int pwchange; /* no mapping change, just wiring or protection */
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int wchange; /* no mapping change, just wiring */
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int mchange; /* was mapped but mapping to different page */
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int managed; /* a managed page */
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int firstpv; /* first mapping for this PA */
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int secondpv; /* second mapping for this PA */
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int ci; /* cache inhibited */
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int unmanaged; /* not a managed page */
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int flushes; /* cache flushes */
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int cachehit; /* new entry forced valid entry out */
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} enter_stats;
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struct {
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int calls;
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int removes;
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int flushes;
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int pidflushes; /* HW pid stolen */
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int pvfirst;
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int pvsearch;
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} remove_stats;
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int pmapdebug;
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#define PDB_FOLLOW 0x0001
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#define PDB_INIT 0x0002
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#define PDB_ENTER 0x0004
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#define PDB_REMOVE 0x0008
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#define PDB_CREATE 0x0010
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#define PDB_PTPAGE 0x0020
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#define PDB_PVENTRY 0x0040
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#define PDB_BITS 0x0080
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#define PDB_COLLECT 0x0100
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#define PDB_PROTECT 0x0200
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#define PDB_TLBPID 0x0400
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#define PDB_PARANOIA 0x2000
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#define PDB_WIRING 0x4000
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#define PDB_PVDUMP 0x8000
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#endif /* DEBUG */
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struct pmap kernel_pmap_store;
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pmap_t kernel_pmap;
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vm_offset_t avail_start; /* PA of first available physical page */
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vm_offset_t avail_end; /* PA of last available physical page */
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vm_size_t mem_size; /* memory size in bytes */
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vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss)*/
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vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */
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int pmaxpagesperpage; /* PAGE_SIZE / NBPG */
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#ifdef ATTR
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char *pmap_attributes; /* reference and modify bits */
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#endif
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struct segtab *free_segtab; /* free list kept locally */
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u_int tlbpid_gen = 1; /* TLB PID generation count */
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int tlbpid_cnt = 2; /* next available TLB PID */
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pt_entry_t *Sysmap; /* kernel pte table */
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u_int Sysmapsize; /* number of pte's in Sysmap */
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/*
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* Bootstrap the system enough to run with virtual memory.
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* firstaddr is the first unused kseg0 address (not page aligned).
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*/
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void
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pmap_bootstrap(firstaddr)
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vm_offset_t firstaddr;
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{
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register int i;
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vm_offset_t start = firstaddr;
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extern int maxmem, physmem;
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#define valloc(name, type, num) \
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(name) = (type *)firstaddr; firstaddr = (vm_offset_t)((name)+(num))
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/*
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* Allocate a PTE table for the kernel.
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* The '1024' comes from PAGER_MAP_SIZE in vm_pager_init().
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* This should be kept in sync.
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* We also reserve space for kmem_alloc_pageable() for vm_fork().
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*/
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Sysmapsize = (VM_KMEM_SIZE + VM_MBUF_SIZE + VM_PHYS_SIZE +
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nbuf * MAXBSIZE + 16 * NCARGS) / NBPG + 1024 + 256;
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#ifdef SYSVSHM
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Sysmapsize += shminfo.shmall;
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#endif
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valloc(Sysmap, pt_entry_t, Sysmapsize);
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#ifdef ATTR
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valloc(pmap_attributes, char, physmem);
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#endif
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/*
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* Allocate memory for pv_table.
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* This will allocate more entries than we really need.
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* We could do this in pmap_init when we know the actual
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* phys_start and phys_end but its better to use kseg0 addresses
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* rather than kernel virtual addresses mapped through the TLB.
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*/
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i = maxmem - pmax_btop(MACH_CACHED_TO_PHYS(firstaddr));
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valloc(pv_table, struct pv_entry, i);
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/*
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* Clear allocated memory.
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*/
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firstaddr = pmax_round_page(firstaddr);
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bzero((caddr_t)start, firstaddr - start);
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avail_start = MACH_CACHED_TO_PHYS(firstaddr);
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avail_end = pmax_ptob(maxmem);
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mem_size = avail_end - avail_start;
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virtual_avail = VM_MIN_KERNEL_ADDRESS;
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virtual_end = VM_MIN_KERNEL_ADDRESS + Sysmapsize * NBPG;
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/* XXX need to decide how to set cnt.v_page_size */
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pmaxpagesperpage = 1;
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kernel_pmap = &kernel_pmap_store;
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simple_lock_init(&kernel_pmap_store.pm_lock);
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kernel_pmap_store.pm_count = 1;
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}
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/*
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* Bootstrap memory allocator. This function allows for early dynamic
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* memory allocation until the virtual memory system has been bootstrapped.
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* After that point, either kmem_alloc or malloc should be used. This
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* function works by stealing pages from the (to be) managed page pool,
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* stealing virtual address space, then mapping the pages and zeroing them.
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*
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* It should be used from pmap_bootstrap till vm_page_startup, afterwards
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* it cannot be used, and will generate a panic if tried. Note that this
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* memory will never be freed, and in essence it is wired down.
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*/
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void *
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pmap_bootstrap_alloc(size)
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int size;
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{
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vm_offset_t val;
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extern boolean_t vm_page_startup_initialized;
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if (vm_page_startup_initialized)
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panic("pmap_bootstrap_alloc: called after startup initialized");
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val = MACH_PHYS_TO_CACHED(avail_start);
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size = round_page(size);
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avail_start += size;
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blkclr((caddr_t)val, size);
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return ((void *)val);
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}
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/*
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* Initialize the pmap module.
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* Called by vm_init, to initialize any structures that the pmap
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* system needs to map virtual memory.
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*/
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void
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pmap_init(phys_start, phys_end)
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vm_offset_t phys_start, phys_end;
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{
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#ifdef DEBUG
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if (pmapdebug & (PDB_FOLLOW|PDB_INIT))
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printf("pmap_init(%x, %x)\n", phys_start, phys_end);
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#endif
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}
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/*
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* Create and return a physical map.
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*
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* If the size specified for the map
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* is zero, the map is an actual physical
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* map, and may be referenced by the
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* hardware.
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*
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* If the size specified is non-zero,
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* the map will be used in software only, and
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* is bounded by that size.
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*/
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pmap_t
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pmap_create(size)
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vm_size_t size;
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{
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register pmap_t pmap;
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#ifdef DEBUG
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if (pmapdebug & (PDB_FOLLOW|PDB_CREATE))
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printf("pmap_create(%x)\n", size);
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#endif
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/*
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* Software use map does not need a pmap
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*/
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if (size)
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return (NULL);
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/* XXX: is it ok to wait here? */
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pmap = (pmap_t) malloc(sizeof *pmap, M_VMPMAP, M_WAITOK);
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#ifdef notifwewait
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if (pmap == NULL)
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panic("pmap_create: cannot allocate a pmap");
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#endif
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bzero(pmap, sizeof(*pmap));
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pmap_pinit(pmap);
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return (pmap);
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}
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/*
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* Initialize a preallocated and zeroed pmap structure,
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* such as one in a vmspace structure.
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*/
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void
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pmap_pinit(pmap)
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register struct pmap *pmap;
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{
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register int i;
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int s;
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extern struct vmspace vmspace0;
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extern struct user *proc0paddr;
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#ifdef DEBUG
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if (pmapdebug & (PDB_FOLLOW|PDB_CREATE))
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printf("pmap_pinit(%x)\n", pmap);
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#endif
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simple_lock_init(&pmap->pm_lock);
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pmap->pm_count = 1;
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if (free_segtab) {
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s = splimp();
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pmap->pm_segtab = free_segtab;
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free_segtab = *(struct segtab **)free_segtab;
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pmap->pm_segtab->seg_tab[0] = NULL;
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splx(s);
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} else {
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register struct segtab *stp;
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vm_page_t mem;
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void pmap_zero_page();
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mem = vm_page_alloc1();
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pmap_zero_page(VM_PAGE_TO_PHYS(mem));
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pmap->pm_segtab = stp = (struct segtab *)
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MACH_PHYS_TO_CACHED(VM_PAGE_TO_PHYS(mem));
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i = pmaxpagesperpage * (NBPG / sizeof(struct segtab));
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s = splimp();
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while (--i != 0) {
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stp++;
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*(struct segtab **)stp = free_segtab;
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free_segtab = stp;
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}
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splx(s);
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}
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#ifdef DIAGNOSTIC
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for (i = 0; i < PMAP_SEGTABSIZE; i++)
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if (pmap->pm_segtab->seg_tab[i] != 0)
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panic("pmap_pinit: pm_segtab != 0");
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#endif
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if (pmap == &vmspace0.vm_pmap) {
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/*
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* The initial process has already been allocated a TLBPID
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* in mach_init().
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*/
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pmap->pm_tlbpid = 1;
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pmap->pm_tlbgen = tlbpid_gen;
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proc0paddr->u_pcb.pcb_segtab = (void *)pmap->pm_segtab;
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} else {
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pmap->pm_tlbpid = 0;
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pmap->pm_tlbgen = 0;
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}
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}
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/*
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* Retire the given physical map from service.
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* Should only be called if the map contains
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* no valid mappings.
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*/
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void
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pmap_destroy(pmap)
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register pmap_t pmap;
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{
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int count;
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#ifdef DEBUG
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if (pmapdebug & (PDB_FOLLOW|PDB_CREATE))
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printf("pmap_destroy(%x)\n", pmap);
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#endif
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if (pmap == NULL)
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return;
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simple_lock(&pmap->pm_lock);
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count = --pmap->pm_count;
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simple_unlock(&pmap->pm_lock);
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if (count == 0) {
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pmap_release(pmap);
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free((caddr_t)pmap, M_VMPMAP);
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}
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}
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/*
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* Release any resources held by the given physical map.
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* Called when a pmap initialized by pmap_pinit is being released.
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* Should only be called if the map contains no valid mappings.
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*/
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void
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pmap_release(pmap)
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register pmap_t pmap;
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{
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#ifdef DEBUG
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if (pmapdebug & (PDB_FOLLOW|PDB_CREATE))
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printf("pmap_release(%x)\n", pmap);
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#endif
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if (pmap->pm_segtab) {
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register pt_entry_t *pte;
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register int i;
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int s;
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#ifdef DIAGNOSTIC
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register int j;
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#endif
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for (i = 0; i < PMAP_SEGTABSIZE; i++) {
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/* get pointer to segment map */
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pte = pmap->pm_segtab->seg_tab[i];
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if (!pte)
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continue;
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vm_page_free1(
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PHYS_TO_VM_PAGE(MACH_CACHED_TO_PHYS(pte)));
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#ifdef DIAGNOSTIC
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for (j = 0; j < NPTEPG; j++) {
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if (pte->pt_entry)
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panic("pmap_release: segmap not empty");
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}
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#endif
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pmap->pm_segtab->seg_tab[i] = NULL;
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}
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s = splimp();
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*(struct segtab **)pmap->pm_segtab = free_segtab;
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free_segtab = pmap->pm_segtab;
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splx(s);
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pmap->pm_segtab = NULL;
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}
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}
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/*
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* Add a reference to the specified pmap.
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*/
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void
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pmap_reference(pmap)
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pmap_t pmap;
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{
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#ifdef DEBUG
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if (pmapdebug & PDB_FOLLOW)
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printf("pmap_reference(%x)\n", pmap);
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#endif
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if (pmap != NULL) {
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simple_lock(&pmap->pm_lock);
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pmap->pm_count++;
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simple_unlock(&pmap->pm_lock);
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}
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}
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/*
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* Remove the given range of addresses from the specified map.
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*
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* It is assumed that the start and end are properly
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* rounded to the page size.
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*/
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void
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pmap_remove(pmap, sva, eva)
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register pmap_t pmap;
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vm_offset_t sva, eva;
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{
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register vm_offset_t nssva;
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register pt_entry_t *pte;
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unsigned entry;
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#ifdef DEBUG
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if (pmapdebug & (PDB_FOLLOW|PDB_REMOVE|PDB_PROTECT))
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printf("pmap_remove(%x, %x, %x)\n", pmap, sva, eva);
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remove_stats.calls++;
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#endif
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if (pmap == NULL)
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return;
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if (!pmap->pm_segtab) {
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register pt_entry_t *pte;
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/* remove entries from kernel pmap */
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#ifdef DIAGNOSTIC
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if (sva < VM_MIN_KERNEL_ADDRESS || eva > virtual_end)
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panic("pmap_remove: kva not in range");
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#endif
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pte = kvtopte(sva);
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for (; sva < eva; sva += NBPG, pte++) {
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entry = pte->pt_entry;
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if (!(entry & PG_V))
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continue;
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if (entry & PG_WIRED)
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pmap->pm_stats.wired_count--;
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pmap->pm_stats.resident_count--;
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pmap_remove_pv(pmap, sva, entry & PG_FRAME);
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#ifdef ATTR
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pmap_attributes[atop(entry & PG_FRAME)] = 0;
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#endif
|
|
pte->pt_entry = PG_NV;
|
|
/*
|
|
* Flush the TLB for the given address.
|
|
*/
|
|
MachTLBFlushAddr(sva);
|
|
#ifdef DEBUG
|
|
remove_stats.flushes++;
|
|
#endif
|
|
}
|
|
return;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (eva > VM_MAXUSER_ADDRESS)
|
|
panic("pmap_remove: uva not in range");
|
|
#endif
|
|
while (sva < eva) {
|
|
nssva = pmax_trunc_seg(sva) + NBSEG;
|
|
if (nssva == 0 || nssva > eva)
|
|
nssva = eva;
|
|
/*
|
|
* If VA belongs to an unallocated segment,
|
|
* skip to the next segment boundary.
|
|
*/
|
|
if (!(pte = pmap_segmap(pmap, sva))) {
|
|
sva = nssva;
|
|
continue;
|
|
}
|
|
/*
|
|
* Invalidate every valid mapping within this segment.
|
|
*/
|
|
pte += (sva >> PGSHIFT) & (NPTEPG - 1);
|
|
for (; sva < nssva; sva += NBPG, pte++) {
|
|
entry = pte->pt_entry;
|
|
if (!(entry & PG_V))
|
|
continue;
|
|
if (entry & PG_WIRED)
|
|
pmap->pm_stats.wired_count--;
|
|
pmap->pm_stats.resident_count--;
|
|
pmap_remove_pv(pmap, sva, entry & PG_FRAME);
|
|
#ifdef ATTR
|
|
pmap_attributes[atop(entry & PG_FRAME)] = 0;
|
|
#endif
|
|
pte->pt_entry = PG_NV;
|
|
/*
|
|
* Flush the TLB for the given address.
|
|
*/
|
|
if (pmap->pm_tlbgen == tlbpid_gen) {
|
|
MachTLBFlushAddr(sva | (pmap->pm_tlbpid <<
|
|
VMMACH_TLB_PID_SHIFT));
|
|
#ifdef DEBUG
|
|
remove_stats.flushes++;
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* pmap_page_protect:
|
|
*
|
|
* Lower the permission for all mappings to a given page.
|
|
*/
|
|
void
|
|
pmap_page_protect(pa, prot)
|
|
vm_offset_t pa;
|
|
vm_prot_t prot;
|
|
{
|
|
register pv_entry_t pv;
|
|
register vm_offset_t va;
|
|
int s;
|
|
|
|
#ifdef DEBUG
|
|
if ((pmapdebug & (PDB_FOLLOW|PDB_PROTECT)) ||
|
|
prot == VM_PROT_NONE && (pmapdebug & PDB_REMOVE))
|
|
printf("pmap_page_protect(%x, %x)\n", pa, prot);
|
|
#endif
|
|
if (!IS_VM_PHYSADDR(pa))
|
|
return;
|
|
|
|
switch (prot) {
|
|
case VM_PROT_READ|VM_PROT_WRITE:
|
|
case VM_PROT_ALL:
|
|
break;
|
|
|
|
/* copy_on_write */
|
|
case VM_PROT_READ:
|
|
case VM_PROT_READ|VM_PROT_EXECUTE:
|
|
pv = pa_to_pvh(pa);
|
|
s = splimp();
|
|
/*
|
|
* Loop over all current mappings setting/clearing as appropos.
|
|
*/
|
|
if (pv->pv_pmap != NULL) {
|
|
for (; pv; pv = pv->pv_next) {
|
|
extern vm_offset_t pager_sva, pager_eva;
|
|
|
|
va = pv->pv_va;
|
|
|
|
/*
|
|
* XXX don't write protect pager mappings
|
|
*/
|
|
if (va >= pager_sva && va < pager_eva)
|
|
continue;
|
|
pmap_protect(pv->pv_pmap, va, va + PAGE_SIZE,
|
|
prot);
|
|
}
|
|
}
|
|
splx(s);
|
|
break;
|
|
|
|
/* remove_all */
|
|
default:
|
|
pv = pa_to_pvh(pa);
|
|
s = splimp();
|
|
while (pv->pv_pmap != NULL) {
|
|
pmap_remove(pv->pv_pmap, pv->pv_va,
|
|
pv->pv_va + PAGE_SIZE);
|
|
}
|
|
splx(s);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set the physical protection on the
|
|
* specified range of this map as requested.
|
|
*/
|
|
void
|
|
pmap_protect(pmap, sva, eva, prot)
|
|
register pmap_t pmap;
|
|
vm_offset_t sva, eva;
|
|
vm_prot_t prot;
|
|
{
|
|
register vm_offset_t nssva;
|
|
register pt_entry_t *pte;
|
|
register unsigned entry;
|
|
u_int p;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & (PDB_FOLLOW|PDB_PROTECT))
|
|
printf("pmap_protect(%x, %x, %x, %x)\n", pmap, sva, eva, prot);
|
|
#endif
|
|
if (pmap == NULL)
|
|
return;
|
|
|
|
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
|
|
pmap_remove(pmap, sva, eva);
|
|
return;
|
|
}
|
|
|
|
p = (prot & VM_PROT_WRITE) ? PG_RW : PG_RO;
|
|
|
|
if (!pmap->pm_segtab) {
|
|
/*
|
|
* Change entries in kernel pmap.
|
|
* This will trap if the page is writeable (in order to set
|
|
* the dirty bit) even if the dirty bit is already set. The
|
|
* optimization isn't worth the effort since this code isn't
|
|
* executed much. The common case is to make a user page
|
|
* read-only.
|
|
*/
|
|
#ifdef DIAGNOSTIC
|
|
if (sva < VM_MIN_KERNEL_ADDRESS || eva > virtual_end)
|
|
panic("pmap_protect: kva not in range");
|
|
#endif
|
|
pte = kvtopte(sva);
|
|
for (; sva < eva; sva += NBPG, pte++) {
|
|
entry = pte->pt_entry;
|
|
if (!(entry & PG_V))
|
|
continue;
|
|
entry = (entry & ~(PG_M | PG_RO)) | p;
|
|
pte->pt_entry = entry;
|
|
/*
|
|
* Update the TLB if the given address is in the cache.
|
|
*/
|
|
MachTLBUpdate(sva, entry);
|
|
}
|
|
return;
|
|
}
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (eva > VM_MAXUSER_ADDRESS)
|
|
panic("pmap_protect: uva not in range");
|
|
#endif
|
|
while (sva < eva) {
|
|
nssva = pmax_trunc_seg(sva) + NBSEG;
|
|
if (nssva == 0 || nssva > eva)
|
|
nssva = eva;
|
|
/*
|
|
* If VA belongs to an unallocated segment,
|
|
* skip to the next segment boundary.
|
|
*/
|
|
if (!(pte = pmap_segmap(pmap, sva))) {
|
|
sva = nssva;
|
|
continue;
|
|
}
|
|
/*
|
|
* Change protection on every valid mapping within this segment.
|
|
*/
|
|
pte += (sva >> PGSHIFT) & (NPTEPG - 1);
|
|
for (; sva < nssva; sva += NBPG, pte++) {
|
|
entry = pte->pt_entry;
|
|
if (!(entry & PG_V))
|
|
continue;
|
|
entry = (entry & ~(PG_M | PG_RO)) | p;
|
|
pte->pt_entry = entry;
|
|
/*
|
|
* Update the TLB if the given address is in the cache.
|
|
*/
|
|
if (pmap->pm_tlbgen == tlbpid_gen)
|
|
MachTLBUpdate(sva | (pmap->pm_tlbpid <<
|
|
VMMACH_TLB_PID_SHIFT), entry);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Insert the given physical page (p) at
|
|
* the specified virtual address (v) in the
|
|
* target physical map with the protection requested.
|
|
*
|
|
* If specified, the page will be wired down, meaning
|
|
* that the related pte can not be reclaimed.
|
|
*
|
|
* NB: This is the only routine which MAY NOT lazy-evaluate
|
|
* or lose information. That is, this routine must actually
|
|
* insert this page into the given map NOW.
|
|
*/
|
|
void
|
|
pmap_enter(pmap, va, pa, prot, wired)
|
|
register pmap_t pmap;
|
|
vm_offset_t va;
|
|
register vm_offset_t pa;
|
|
vm_prot_t prot;
|
|
boolean_t wired;
|
|
{
|
|
register pt_entry_t *pte;
|
|
register u_int npte;
|
|
register int i, j;
|
|
vm_page_t mem;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & (PDB_FOLLOW|PDB_ENTER))
|
|
printf("pmap_enter(%x, %x, %x, %x, %x)\n",
|
|
pmap, va, pa, prot, wired);
|
|
#endif
|
|
#ifdef DIAGNOSTIC
|
|
if (!pmap)
|
|
panic("pmap_enter: pmap");
|
|
if (!pmap->pm_segtab) {
|
|
enter_stats.kernel++;
|
|
if (va < VM_MIN_KERNEL_ADDRESS || va >= virtual_end)
|
|
panic("pmap_enter: kva");
|
|
} else {
|
|
enter_stats.user++;
|
|
if (va >= VM_MAXUSER_ADDRESS)
|
|
panic("pmap_enter: uva");
|
|
}
|
|
if (pa & 0x80000000)
|
|
panic("pmap_enter: pa");
|
|
if (!(prot & VM_PROT_READ))
|
|
panic("pmap_enter: prot");
|
|
#endif
|
|
|
|
if (IS_VM_PHYSADDR(pa)) {
|
|
register pv_entry_t pv, npv;
|
|
int s;
|
|
|
|
if (!(prot & VM_PROT_WRITE))
|
|
npte = PG_RO;
|
|
else {
|
|
register vm_page_t mem;
|
|
|
|
mem = PHYS_TO_VM_PAGE(pa);
|
|
if ((int)va < 0) {
|
|
/*
|
|
* Don't bother to trap on kernel writes,
|
|
* just record page as dirty.
|
|
*/
|
|
npte = PG_M;
|
|
mem->flags &= ~PG_CLEAN;
|
|
} else
|
|
#ifdef ATTR
|
|
if ((pmap_attributes[atop(pa)] &
|
|
PMAP_ATTR_MOD) || !(mem->flags & PG_CLEAN))
|
|
#else
|
|
if (!(mem->flags & PG_CLEAN))
|
|
#endif
|
|
npte = PG_M;
|
|
else
|
|
npte = 0;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
enter_stats.managed++;
|
|
#endif
|
|
/*
|
|
* Enter the pmap and virtual address into the
|
|
* physical to virtual map table.
|
|
*/
|
|
pv = pa_to_pvh(pa);
|
|
s = splimp();
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_ENTER)
|
|
printf("pmap_enter: pv %x: was %x/%x/%x\n",
|
|
pv, pv->pv_va, pv->pv_pmap, pv->pv_next);
|
|
#endif
|
|
if (pv->pv_pmap == NULL) {
|
|
/*
|
|
* No entries yet, use header as the first entry
|
|
*/
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_PVENTRY)
|
|
printf("pmap_enter: first pv: pmap %x va %x\n",
|
|
pmap, va);
|
|
enter_stats.firstpv++;
|
|
#endif
|
|
pv->pv_va = va;
|
|
pv->pv_pmap = pmap;
|
|
pv->pv_next = NULL;
|
|
} else {
|
|
/*
|
|
* There is at least one other VA mapping this page.
|
|
* Place this entry after the header.
|
|
*
|
|
* Note: the entry may already be in the table if
|
|
* we are only changing the protection bits.
|
|
*/
|
|
for (npv = pv; npv; npv = npv->pv_next)
|
|
if (pmap == npv->pv_pmap && va == npv->pv_va) {
|
|
#ifdef DIAGNOSTIC
|
|
unsigned entry;
|
|
|
|
if (!pmap->pm_segtab)
|
|
entry = kvtopte(va)->pt_entry;
|
|
else {
|
|
pte = pmap_segmap(pmap, va);
|
|
if (pte) {
|
|
pte += (va >> PGSHIFT) &
|
|
(NPTEPG - 1);
|
|
entry = pte->pt_entry;
|
|
} else
|
|
entry = 0;
|
|
}
|
|
if (!(entry & PG_V) ||
|
|
(entry & PG_FRAME) != pa)
|
|
printf(
|
|
"pmap_enter: found va %x pa %x in pv_table but != %x\n",
|
|
va, pa, entry);
|
|
#endif
|
|
goto fnd;
|
|
}
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_PVENTRY)
|
|
printf("pmap_enter: new pv: pmap %x va %x\n",
|
|
pmap, va);
|
|
#endif
|
|
/* can this cause us to recurse forever? */
|
|
npv = (pv_entry_t)
|
|
malloc(sizeof *npv, M_VMPVENT, M_NOWAIT);
|
|
npv->pv_va = va;
|
|
npv->pv_pmap = pmap;
|
|
npv->pv_next = pv->pv_next;
|
|
pv->pv_next = npv;
|
|
#ifdef DEBUG
|
|
if (!npv->pv_next)
|
|
enter_stats.secondpv++;
|
|
#endif
|
|
fnd:
|
|
;
|
|
}
|
|
splx(s);
|
|
} else {
|
|
/*
|
|
* Assumption: if it is not part of our managed memory
|
|
* then it must be device memory which may be volitile.
|
|
*/
|
|
#ifdef DEBUG
|
|
enter_stats.unmanaged++;
|
|
#endif
|
|
npte = (prot & VM_PROT_WRITE) ? (PG_M | PG_N) : (PG_RO | PG_N);
|
|
}
|
|
|
|
/*
|
|
* The only time we need to flush the cache is if we
|
|
* execute from a physical address and then change the data.
|
|
* This is the best place to do this.
|
|
* pmap_protect() and pmap_remove() are mostly used to switch
|
|
* between R/W and R/O pages.
|
|
* NOTE: we only support cache flush for read only text.
|
|
*/
|
|
if (prot == (VM_PROT_READ | VM_PROT_EXECUTE))
|
|
MachFlushICache(MACH_PHYS_TO_CACHED(pa), PAGE_SIZE);
|
|
|
|
if (!pmap->pm_segtab) {
|
|
/* enter entries into kernel pmap */
|
|
pte = kvtopte(va);
|
|
npte |= pa | PG_V | PG_G;
|
|
if (wired) {
|
|
pmap->pm_stats.wired_count += pmaxpagesperpage;
|
|
npte |= PG_WIRED;
|
|
}
|
|
i = pmaxpagesperpage;
|
|
do {
|
|
if (!(pte->pt_entry & PG_V)) {
|
|
pmap->pm_stats.resident_count++;
|
|
} else {
|
|
#ifdef DIAGNOSTIC
|
|
if (pte->pt_entry & PG_WIRED)
|
|
panic("pmap_enter: kernel wired");
|
|
#endif
|
|
}
|
|
/*
|
|
* Update the same virtual address entry.
|
|
*/
|
|
MachTLBUpdate(va, npte);
|
|
pte->pt_entry = npte;
|
|
va += NBPG;
|
|
npte += NBPG;
|
|
pte++;
|
|
} while (--i != 0);
|
|
return;
|
|
}
|
|
|
|
if (!(pte = pmap_segmap(pmap, va))) {
|
|
mem = vm_page_alloc1();
|
|
pmap_zero_page(VM_PAGE_TO_PHYS(mem));
|
|
pmap_segmap(pmap, va) = pte = (pt_entry_t *)
|
|
MACH_PHYS_TO_CACHED(VM_PAGE_TO_PHYS(mem));
|
|
}
|
|
pte += (va >> PGSHIFT) & (NPTEPG - 1);
|
|
|
|
/*
|
|
* Now validate mapping with desired protection/wiring.
|
|
* Assume uniform modified and referenced status for all
|
|
* PMAX pages in a MACH page.
|
|
*/
|
|
npte |= pa | PG_V;
|
|
if (wired) {
|
|
pmap->pm_stats.wired_count += pmaxpagesperpage;
|
|
npte |= PG_WIRED;
|
|
}
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_ENTER) {
|
|
printf("pmap_enter: new pte %x", npte);
|
|
if (pmap->pm_tlbgen == tlbpid_gen)
|
|
printf(" tlbpid %d", pmap->pm_tlbpid);
|
|
printf("\n");
|
|
}
|
|
#endif
|
|
i = pmaxpagesperpage;
|
|
do {
|
|
pte->pt_entry = npte;
|
|
if (pmap->pm_tlbgen == tlbpid_gen)
|
|
MachTLBUpdate(va | (pmap->pm_tlbpid <<
|
|
VMMACH_TLB_PID_SHIFT), npte);
|
|
va += NBPG;
|
|
npte += NBPG;
|
|
pte++;
|
|
} while (--i != 0);
|
|
}
|
|
|
|
/*
|
|
* Routine: pmap_change_wiring
|
|
* Function: Change the wiring attribute for a map/virtual-address
|
|
* pair.
|
|
* In/out conditions:
|
|
* The mapping must already exist in the pmap.
|
|
*/
|
|
void
|
|
pmap_change_wiring(pmap, va, wired)
|
|
register pmap_t pmap;
|
|
vm_offset_t va;
|
|
boolean_t wired;
|
|
{
|
|
register pt_entry_t *pte;
|
|
u_int p;
|
|
register int i;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & (PDB_FOLLOW|PDB_WIRING))
|
|
printf("pmap_change_wiring(%x, %x, %x)\n", pmap, va, wired);
|
|
#endif
|
|
if (pmap == NULL)
|
|
return;
|
|
|
|
p = wired ? PG_WIRED : 0;
|
|
|
|
/*
|
|
* Don't need to flush the TLB since PG_WIRED is only in software.
|
|
*/
|
|
if (!pmap->pm_segtab) {
|
|
/* change entries in kernel pmap */
|
|
#ifdef DIAGNOSTIC
|
|
if (va < VM_MIN_KERNEL_ADDRESS || va >= virtual_end)
|
|
panic("pmap_change_wiring");
|
|
#endif
|
|
pte = kvtopte(va);
|
|
} else {
|
|
if (!(pte = pmap_segmap(pmap, va)))
|
|
return;
|
|
pte += (va >> PGSHIFT) & (NPTEPG - 1);
|
|
}
|
|
|
|
i = pmaxpagesperpage;
|
|
if (!(pte->pt_entry & PG_WIRED) && p)
|
|
pmap->pm_stats.wired_count += i;
|
|
else if ((pte->pt_entry & PG_WIRED) && !p)
|
|
pmap->pm_stats.wired_count -= i;
|
|
do {
|
|
if (pte->pt_entry & PG_V)
|
|
pte->pt_entry = (pte->pt_entry & ~PG_WIRED) | p;
|
|
pte++;
|
|
} while (--i != 0);
|
|
}
|
|
|
|
/*
|
|
* Routine: pmap_extract
|
|
* Function:
|
|
* Extract the physical page address associated
|
|
* with the given map/virtual_address pair.
|
|
*/
|
|
vm_offset_t
|
|
pmap_extract(pmap, va)
|
|
register pmap_t pmap;
|
|
vm_offset_t va;
|
|
{
|
|
register vm_offset_t pa;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_extract(%x, %x) -> ", pmap, va);
|
|
#endif
|
|
|
|
if (!pmap->pm_segtab) {
|
|
#ifdef DIAGNOSTIC
|
|
if (va < VM_MIN_KERNEL_ADDRESS || va >= virtual_end)
|
|
panic("pmap_extract");
|
|
#endif
|
|
pa = kvtopte(va)->pt_entry & PG_FRAME;
|
|
} else {
|
|
register pt_entry_t *pte;
|
|
|
|
if (!(pte = pmap_segmap(pmap, va)))
|
|
pa = 0;
|
|
else {
|
|
pte += (va >> PGSHIFT) & (NPTEPG - 1);
|
|
pa = pte->pt_entry & PG_FRAME;
|
|
}
|
|
}
|
|
if (pa)
|
|
pa |= va & PGOFSET;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_extract: pa %x\n", pa);
|
|
#endif
|
|
return (pa);
|
|
}
|
|
|
|
/*
|
|
* Copy the range specified by src_addr/len
|
|
* from the source map to the range dst_addr/len
|
|
* in the destination map.
|
|
*
|
|
* This routine is only advisory and need not do anything.
|
|
*/
|
|
void
|
|
pmap_copy(dst_pmap, src_pmap, dst_addr, len, src_addr)
|
|
pmap_t dst_pmap;
|
|
pmap_t src_pmap;
|
|
vm_offset_t dst_addr;
|
|
vm_size_t len;
|
|
vm_offset_t src_addr;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_copy(%x, %x, %x, %x, %x)\n",
|
|
dst_pmap, src_pmap, dst_addr, len, src_addr);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Require that all active physical maps contain no
|
|
* incorrect entries NOW. [This update includes
|
|
* forcing updates of any address map caching.]
|
|
*
|
|
* Generally used to insure that a thread about
|
|
* to run will see a semantically correct world.
|
|
*/
|
|
void
|
|
pmap_update()
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_update()\n");
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Routine: pmap_collect
|
|
* Function:
|
|
* Garbage collects the physical map system for
|
|
* pages which are no longer used.
|
|
* Success need not be guaranteed -- that is, there
|
|
* may well be pages which are not referenced, but
|
|
* others may be collected.
|
|
* Usage:
|
|
* Called by the pageout daemon when pages are scarce.
|
|
*/
|
|
void
|
|
pmap_collect(pmap)
|
|
pmap_t pmap;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_collect(%x)\n", pmap);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* pmap_zero_page zeros the specified (machine independent)
|
|
* page.
|
|
*/
|
|
void
|
|
pmap_zero_page(phys)
|
|
vm_offset_t phys;
|
|
{
|
|
register int *p, *end;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_zero_page(%x)\n", phys);
|
|
#endif
|
|
p = (int *)MACH_PHYS_TO_CACHED(phys);
|
|
end = p + PAGE_SIZE / sizeof(int);
|
|
do {
|
|
p[0] = 0;
|
|
p[1] = 0;
|
|
p[2] = 0;
|
|
p[3] = 0;
|
|
p += 4;
|
|
} while (p != end);
|
|
}
|
|
|
|
/*
|
|
* pmap_copy_page copies the specified (machine independent)
|
|
* page.
|
|
*/
|
|
void
|
|
pmap_copy_page(src, dst)
|
|
vm_offset_t src, dst;
|
|
{
|
|
register int *s, *d, *end;
|
|
register int tmp0, tmp1, tmp2, tmp3;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_copy_page(%x, %x)\n", src, dst);
|
|
#endif
|
|
s = (int *)MACH_PHYS_TO_CACHED(src);
|
|
d = (int *)MACH_PHYS_TO_CACHED(dst);
|
|
end = s + PAGE_SIZE / sizeof(int);
|
|
do {
|
|
tmp0 = s[0];
|
|
tmp1 = s[1];
|
|
tmp2 = s[2];
|
|
tmp3 = s[3];
|
|
d[0] = tmp0;
|
|
d[1] = tmp1;
|
|
d[2] = tmp2;
|
|
d[3] = tmp3;
|
|
s += 4;
|
|
d += 4;
|
|
} while (s != end);
|
|
}
|
|
|
|
/*
|
|
* Routine: pmap_pageable
|
|
* Function:
|
|
* Make the specified pages (by pmap, offset)
|
|
* pageable (or not) as requested.
|
|
*
|
|
* A page which is not pageable may not take
|
|
* a fault; therefore, its page table entry
|
|
* must remain valid for the duration.
|
|
*
|
|
* This routine is merely advisory; pmap_enter
|
|
* will specify that these pages are to be wired
|
|
* down (or not) as appropriate.
|
|
*/
|
|
void
|
|
pmap_pageable(pmap, sva, eva, pageable)
|
|
pmap_t pmap;
|
|
vm_offset_t sva, eva;
|
|
boolean_t pageable;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_pageable(%x, %x, %x, %x)\n",
|
|
pmap, sva, eva, pageable);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Clear the modify bits on the specified physical page.
|
|
*/
|
|
void
|
|
pmap_clear_modify(pa)
|
|
vm_offset_t pa;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_clear_modify(%x)\n", pa);
|
|
#endif
|
|
#ifdef ATTR
|
|
pmap_attributes[atop(pa)] &= ~PMAP_ATTR_MOD;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* pmap_clear_reference:
|
|
*
|
|
* Clear the reference bit on the specified physical page.
|
|
*/
|
|
void
|
|
pmap_clear_reference(pa)
|
|
vm_offset_t pa;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_clear_reference(%x)\n", pa);
|
|
#endif
|
|
#ifdef ATTR
|
|
pmap_attributes[atop(pa)] &= ~PMAP_ATTR_REF;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* pmap_is_referenced:
|
|
*
|
|
* Return whether or not the specified physical page is referenced
|
|
* by any physical maps.
|
|
*/
|
|
boolean_t
|
|
pmap_is_referenced(pa)
|
|
vm_offset_t pa;
|
|
{
|
|
#ifdef ATTR
|
|
return (pmap_attributes[atop(pa)] & PMAP_ATTR_REF);
|
|
#else
|
|
return (FALSE);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* pmap_is_modified:
|
|
*
|
|
* Return whether or not the specified physical page is modified
|
|
* by any physical maps.
|
|
*/
|
|
boolean_t
|
|
pmap_is_modified(pa)
|
|
vm_offset_t pa;
|
|
{
|
|
#ifdef ATTR
|
|
return (pmap_attributes[atop(pa)] & PMAP_ATTR_MOD);
|
|
#else
|
|
return (FALSE);
|
|
#endif
|
|
}
|
|
|
|
vm_offset_t
|
|
pmap_phys_address(ppn)
|
|
int ppn;
|
|
{
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & PDB_FOLLOW)
|
|
printf("pmap_phys_address(%x)\n", ppn);
|
|
#endif
|
|
return (pmax_ptob(ppn));
|
|
}
|
|
|
|
/*
|
|
* Miscellaneous support routines
|
|
*/
|
|
|
|
/*
|
|
* Allocate a hardware PID and return it.
|
|
* It takes almost as much or more time to search the TLB for a
|
|
* specific PID and flush those entries as it does to flush the entire TLB.
|
|
* Therefore, when we allocate a new PID, we just take the next number. When
|
|
* we run out of numbers, we flush the TLB, increment the generation count
|
|
* and start over. PID zero is reserved for kernel use.
|
|
* This is called only by switch().
|
|
*/
|
|
int
|
|
pmap_alloc_tlbpid(p)
|
|
register struct proc *p;
|
|
{
|
|
register pmap_t pmap;
|
|
register int id;
|
|
|
|
pmap = &p->p_vmspace->vm_pmap;
|
|
if (pmap->pm_tlbgen != tlbpid_gen) {
|
|
id = tlbpid_cnt;
|
|
if (id == VMMACH_NUM_PIDS) {
|
|
MachTLBFlush();
|
|
/* reserve tlbpid_gen == 0 to alway mean invalid */
|
|
if (++tlbpid_gen == 0)
|
|
tlbpid_gen = 1;
|
|
id = 1;
|
|
}
|
|
tlbpid_cnt = id + 1;
|
|
pmap->pm_tlbpid = id;
|
|
pmap->pm_tlbgen = tlbpid_gen;
|
|
} else
|
|
id = pmap->pm_tlbpid;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & (PDB_FOLLOW|PDB_TLBPID)) {
|
|
if (curproc)
|
|
printf("pmap_alloc_tlbpid: curproc %d '%s' ",
|
|
curproc->p_pid, curproc->p_comm);
|
|
else
|
|
printf("pmap_alloc_tlbpid: curproc <none> ");
|
|
printf("segtab %x tlbpid %d pid %d '%s'\n",
|
|
pmap->pm_segtab, id, p->p_pid, p->p_comm);
|
|
}
|
|
#endif
|
|
return (id);
|
|
}
|
|
|
|
/*
|
|
* Remove a physical to virtual address translation.
|
|
*/
|
|
void
|
|
pmap_remove_pv(pmap, va, pa)
|
|
pmap_t pmap;
|
|
vm_offset_t va, pa;
|
|
{
|
|
register pv_entry_t pv, npv;
|
|
int s;
|
|
|
|
#ifdef DEBUG
|
|
if (pmapdebug & (PDB_FOLLOW|PDB_PVENTRY))
|
|
printf("pmap_remove_pv(%x, %x, %x)\n", pmap, va, pa);
|
|
#endif
|
|
/*
|
|
* Remove page from the PV table (raise IPL since we
|
|
* may be called at interrupt time).
|
|
*/
|
|
if (!IS_VM_PHYSADDR(pa))
|
|
return;
|
|
pv = pa_to_pvh(pa);
|
|
s = splimp();
|
|
/*
|
|
* If it is the first entry on the list, it is actually
|
|
* in the header and we must copy the following entry up
|
|
* to the header. Otherwise we must search the list for
|
|
* the entry. In either case we free the now unused entry.
|
|
*/
|
|
if (pmap == pv->pv_pmap && va == pv->pv_va) {
|
|
npv = pv->pv_next;
|
|
if (npv) {
|
|
*pv = *npv;
|
|
free((caddr_t)npv, M_VMPVENT);
|
|
} else
|
|
pv->pv_pmap = NULL;
|
|
#ifdef DEBUG
|
|
remove_stats.pvfirst++;
|
|
#endif
|
|
} else {
|
|
for (npv = pv->pv_next; npv; pv = npv, npv = npv->pv_next) {
|
|
#ifdef DEBUG
|
|
remove_stats.pvsearch++;
|
|
#endif
|
|
if (pmap == npv->pv_pmap && va == npv->pv_va)
|
|
goto fnd;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
printf("pmap_remove_pv(%x, %x, %x) not found\n", pmap, va, pa);
|
|
panic("pmap_remove_pv");
|
|
#endif
|
|
fnd:
|
|
pv->pv_next = npv->pv_next;
|
|
free((caddr_t)npv, M_VMPVENT);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* vm_page_alloc1:
|
|
*
|
|
* Allocate and return a memory cell with no associated object.
|
|
*/
|
|
vm_page_t
|
|
vm_page_alloc1()
|
|
{
|
|
register vm_page_t mem;
|
|
int spl;
|
|
|
|
spl = splimp(); /* XXX */
|
|
simple_lock(&vm_page_queue_free_lock);
|
|
if (vm_page_queue_free.tqh_first == NULL) {
|
|
simple_unlock(&vm_page_queue_free_lock);
|
|
splx(spl);
|
|
return (NULL);
|
|
}
|
|
|
|
mem = vm_page_queue_free.tqh_first;
|
|
TAILQ_REMOVE(&vm_page_queue_free, mem, pageq);
|
|
|
|
cnt.v_free_count--;
|
|
simple_unlock(&vm_page_queue_free_lock);
|
|
splx(spl);
|
|
|
|
mem->flags = PG_BUSY | PG_CLEAN | PG_FAKE;
|
|
mem->wire_count = 0;
|
|
|
|
/*
|
|
* Decide if we should poke the pageout daemon.
|
|
* We do this if the free count is less than the low
|
|
* water mark, or if the free count is less than the high
|
|
* water mark (but above the low water mark) and the inactive
|
|
* count is less than its target.
|
|
*
|
|
* We don't have the counts locked ... if they change a little,
|
|
* it doesn't really matter.
|
|
*/
|
|
|
|
if (cnt.v_free_count < cnt.v_free_min ||
|
|
(cnt.v_free_count < cnt.v_free_target &&
|
|
cnt.v_inactive_count < cnt.v_inactive_target))
|
|
thread_wakeup((int)&vm_pages_needed);
|
|
return (mem);
|
|
}
|
|
|
|
/*
|
|
* vm_page_free1:
|
|
*
|
|
* Returns the given page to the free list,
|
|
* disassociating it with any VM object.
|
|
*
|
|
* Object and page must be locked prior to entry.
|
|
*/
|
|
void
|
|
vm_page_free1(mem)
|
|
register vm_page_t mem;
|
|
{
|
|
|
|
if (mem->flags & PG_ACTIVE) {
|
|
TAILQ_REMOVE(&vm_page_queue_active, mem, pageq);
|
|
mem->flags &= ~PG_ACTIVE;
|
|
cnt.v_active_count--;
|
|
}
|
|
|
|
if (mem->flags & PG_INACTIVE) {
|
|
TAILQ_REMOVE(&vm_page_queue_inactive, mem, pageq);
|
|
mem->flags &= ~PG_INACTIVE;
|
|
cnt.v_inactive_count--;
|
|
}
|
|
|
|
if (!(mem->flags & PG_FICTITIOUS)) {
|
|
int spl;
|
|
|
|
spl = splimp();
|
|
simple_lock(&vm_page_queue_free_lock);
|
|
TAILQ_INSERT_TAIL(&vm_page_queue_free, mem, pageq);
|
|
|
|
cnt.v_free_count++;
|
|
simple_unlock(&vm_page_queue_free_lock);
|
|
splx(spl);
|
|
}
|
|
}
|