NetBSD/sys/arch/pmax/include/pmap.h

121 lines
4.7 KiB
C

/*
* Copyright (c) 1987 Carnegie-Mellon University
* Copyright (c) 1992 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)pmap.h 7.6 (Berkeley) 2/4/93
* $Id: pmap.h,v 1.1.1.1 1993/10/12 03:22:40 deraadt Exp $
*/
#ifndef _PMAP_MACHINE_
#define _PMAP_MACHINE_
/*
* TLB hash table values.
* SHIFT2 should shift virtual address bit 22 to the high bit of the index.
* address: index:
* USRTEXT 0x00400000 10xxxxxxx
* USRDATA 0x10000000 00xxxxxxx
* USRSTACK 0x7FFFFFFF 11xxxxxxx
* This gives 1/2 the table to data, 1/4 for text and 1/4 for stack.
* Note: the current process has its hash table mapped at PMAP_HASH_UADDR.
* the kernel's hash table is mapped at PMAP_HASH_KADDR.
* The size of the hash table is known in locore.s.
* The wired entries in the TLB will contain the following:
* UPAGES (for curproc)
* PMAP_HASH_UPAGES (for curproc)
* PMAP_HASH_KPAGES (for kernel)
* The kernel doesn't actually use a pmap_hash_t, the pm_hash field is NULL and
* all the PTE entries are stored in a single array at PMAP_HASH_KADDR.
* If we need more KPAGES that the TLB has wired entries, then we can switch
* to a global pointer for the kernel TLB table.
* If we try to use a hash table for the kernel, wired TLB entries become a
* problem.
* Note: PMAP_HASH_UPAGES should be a multiple of MACH pages (see pmap_enter()).
*/
#define PMAP_HASH_UPAGES 1
#define PMAP_HASH_KPAGES 5
#define PMAP_HASH_UADDR (UADDR - PMAP_HASH_UPAGES * NBPG)
#define PMAP_HASH_KADDR (UADDR - (PMAP_HASH_UPAGES + PMAP_HASH_KPAGES) * NBPG)
#define PMAP_HASH_NUM_ENTRIES 256
#define PMAP_HASH_SIZE_SHIFT 4
#define PMAP_HASH_SHIFT1 12
#define PMAP_HASH_SHIFT2 21
#define PMAP_HASH_MASK1 0x07f
#define PMAP_HASH_MASK2 0x080
#define PMAP_HASH_SIZE (PMAP_HASH_NUM_ENTRIES*sizeof(struct pmap_hash))
/* compute pointer to pmap hash table */
#define PMAP_HASH(va) \
((((va) >> PMAP_HASH_SHIFT1) & PMAP_HASH_MASK1) | \
(((va) >> PMAP_HASH_SHIFT2) & PMAP_HASH_MASK2))
/*
* A TLB hash entry.
*/
typedef struct pmap_hash {
struct {
u_int low; /* The TLB low register value. */
u_int high; /* The TLB high register value. */
} pmh_pte[2];
} *pmap_hash_t;
/*
* Machine dependent pmap structure.
*/
typedef struct pmap {
int pm_count; /* pmap reference count */
simple_lock_data_t pm_lock; /* lock on pmap */
struct pmap_statistics pm_stats; /* pmap statistics */
int pm_flags; /* see below */
int pm_tlbpid; /* address space tag */
pmap_hash_t pm_hash; /* TLB cache */
unsigned pm_hash_ptes[PMAP_HASH_UPAGES];
} *pmap_t;
#define PM_MODIFIED 1 /* flush tlbpid before resume() */
/*
* Defines for pmap_attributes[phys_mach_page];
*/
#define PMAP_ATTR_MOD 0x01 /* page has been modified */
#define PMAP_ATTR_REF 0x02 /* page has been referenced */
#ifdef KERNEL
extern struct pmap kernel_pmap_store;
#define kernel_pmap (&kernel_pmap_store)
extern char *pmap_attributes; /* reference and modify bits */
#endif KERNEL
#endif _PMAP_MACHINE_