202 lines
6.1 KiB
C
202 lines
6.1 KiB
C
/* $NetBSD: pmap.h,v 1.19 1995/05/11 16:53:06 jtc Exp $ */
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/*
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* Copyright (c) 1991 Regents of the University of California.
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* 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 William Jolitz of UUNET Technologies Inc.
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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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* @(#)pmap.h 7.4 (Berkeley) 5/12/91
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*/
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/*
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* Derived from hp300 version by Mike Hibler, this version by William
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* Jolitz uses a recursive map [a pde points to the page directory] to
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* map the page tables using the pagetables themselves. This is done to
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* reduce the impact on kernel virtual memory for lots of sparse address
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* space, and to reduce the cost of memory to each process.
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*
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* from hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
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*/
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#ifndef _I386_PMAP_H_
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#define _I386_PMAP_H_
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#include <machine/cpufunc.h>
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#include <machine/pte.h>
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/*
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* 386 page table entry and page table directory
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* W.Jolitz, 8/89
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*/
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/*
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* One page directory, shared between
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* kernel and user modes.
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*/
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#define UPTDI 0x3de /* ptd entry for u./kernel&user stack */
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#define PTDPTDI 0x3df /* ptd entry that points to ptd! */
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#define KPTDI 0x3e0 /* start of kernel virtual pde's */
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#define NKPDE 12
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#define APTDPTDI 0x3ff /* start of alternate page directory */
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/*
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* Address of current and alternate address space page table maps
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* and directories.
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*/
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#ifdef _KERNEL
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extern pt_entry_t PTmap[], APTmap[], Upte;
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extern pd_entry_t PTD[], APTD[], PTDpde, APTDpde, Upde;
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extern pt_entry_t *Sysmap;
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extern int IdlePTD; /* physical address of "Idle" state directory */
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void pmap_bootstrap __P((vm_offset_t start));
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boolean_t pmap_testbit __P((vm_offset_t, int));
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void pmap_changebit __P((vm_offset_t, int, int));
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__pure u_int pmap_page_index __P((vm_offset_t));
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#endif
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/*
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* virtual address to page table entry and
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* to physical address. Likewise for alternate address space.
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* Note: these work recursively, thus vtopte of a pte will give
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* the corresponding pde that in turn maps it.
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*/
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#define vtopte(va) (PTmap + i386_btop(va))
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#define kvtopte(va) vtopte(va)
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#define ptetov(pt) (i386_ptob(pt - PTmap))
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#define vtophys(va) \
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((*vtopte(va) & PG_FRAME) | ((unsigned)(va) & ~PG_FRAME))
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#define avtopte(va) (APTmap + i386_btop(va))
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#define ptetoav(pt) (i386_ptob(pt - APTmap))
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#define avtophys(va) \
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((*avtopte(va) & PG_FRAME) | ((unsigned)(va) & ~PG_FRAME))
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/*
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* macros to generate page directory/table indicies
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*/
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#define pdei(va) (((va) & PD_MASK) >> PDSHIFT)
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#define ptei(va) (((va) & PT_MASK) >> PGSHIFT)
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/*
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* Pmap stuff
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*/
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typedef struct pmap {
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pd_entry_t *pm_pdir; /* KVA of page directory */
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boolean_t pm_pdchanged; /* pdir changed */
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short pm_dref; /* page directory ref count */
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short pm_count; /* pmap reference count */
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simple_lock_data_t pm_lock; /* lock on pmap */
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struct pmap_statistics pm_stats; /* pmap statistics */
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long pm_ptpages; /* more stats: PT pages */
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} *pmap_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, the list is pv_table.
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*/
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struct pv_entry {
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struct pv_entry *pv_next; /* next pv_entry */
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pmap_t pv_pmap; /* pmap where mapping lies */
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vm_offset_t pv_va; /* virtual address for mapping */
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};
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struct pv_page;
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struct pv_page_info {
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TAILQ_ENTRY(pv_page) pgi_list;
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struct pv_entry *pgi_freelist;
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int pgi_nfree;
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};
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/*
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* This is basically:
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* ((NBPG - sizeof(struct pv_page_info)) / sizeof(struct pv_entry))
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*/
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#define NPVPPG 340
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struct pv_page {
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struct pv_page_info pvp_pgi;
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struct pv_entry pvp_pv[NPVPPG];
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};
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#ifdef _KERNEL
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extern struct pmap kernel_pmap_store;
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struct pv_entry *pv_table; /* array of entries, one per page */
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#define pmap_kernel() (&kernel_pmap_store)
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#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
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#define pmap_update() tlbflush()
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static __inline void
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pmap_clear_modify(vm_offset_t pa)
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{
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pmap_changebit(pa, 0, ~PG_M);
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}
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static __inline void
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pmap_clear_reference(vm_offset_t pa)
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{
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pmap_changebit(pa, 0, ~PG_U);
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}
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static __inline void
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pmap_copy_on_write(vm_offset_t pa)
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{
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pmap_changebit(pa, PG_RO, ~PG_RW);
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}
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static __inline boolean_t
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pmap_is_modified(vm_offset_t pa)
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{
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return pmap_testbit(pa, PG_M);
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}
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static __inline boolean_t
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pmap_is_referenced(vm_offset_t pa)
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{
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return pmap_testbit(pa, PG_U);
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}
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static __inline vm_offset_t
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pmap_phys_address(int ppn)
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{
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return i386_ptob(ppn);
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}
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#endif /* _KERNEL */
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#endif /* _I386_PMAP_H_ */
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