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/* $OpenBSD: pmap.h,v 1.2 1996/02/28 15:03:41 mickey Exp $ */
/*
* Copyright (c) 1995 Charles M. Hannum. All rights reserved.
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and William Jolitz of UUNET Technologies Inc.
*
* 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.
*
* @(#)pmap.h 7.4 (Berkeley) 5/12/91
*/
/*
* Derived from hp300 version by Mike Hibler, this version by William
* Jolitz uses a recursive map [a pde points to the page directory] to
* map the page tables using the pagetables themselves. This is done to
* reduce the impact on kernel virtual memory for lots of sparse address
* space, and to reduce the cost of memory to each process.
*
* from hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
*/
#ifndef _I386_PMAP_H_
#define _I386_PMAP_H_
#include <machine/cpufunc.h>
#include <machine/pte.h>
/*
* 386 page table entry and page table directory
* W.Jolitz, 8/89
*/
/*
* One page directory, shared between
* kernel and user modes.
*/
#define PTDPTDI 0x3df /* ptd entry that points to ptd! */
#define KPTDI 0x3e0 /* start of kernel virtual pde's */
#define NKPDE 12
#define APTDPTDI 0x3ff /* start of alternate page directory */
/*
* Address of current and alternate address space page table maps
* and directories.
*/
#ifdef _KERNEL
extern pt_entry_t PTmap[], APTmap[], Upte;
extern pd_entry_t PTD[], APTD[], PTDpde, APTDpde, Upde;
extern pt_entry_t *Sysmap;
extern int PTDpaddr; /* physical address of kernel PTD */
void pmap_bootstrap __P((vm_offset_t start));
boolean_t pmap_testbit __P((vm_offset_t, int));
void pmap_changebit __P((vm_offset_t, int, int));
__pure int pmap_page_index __P((vm_offset_t));
#endif
/*
* virtual address to page table entry and
* to physical address. Likewise for alternate address space.
* Note: these work recursively, thus vtopte of a pte will give
* the corresponding pde that in turn maps it.
*/
#define vtopte(va) (PTmap + i386_btop(va))
#define kvtopte(va) vtopte(va)
#define ptetov(pt) (i386_ptob(pt - PTmap))
#define vtophys(va) \
((*vtopte(va) & PG_FRAME) | ((unsigned)(va) & ~PG_FRAME))
#define avtopte(va) (APTmap + i386_btop(va))
#define ptetoav(pt) (i386_ptob(pt - APTmap))
#define avtophys(va) \
((*avtopte(va) & PG_FRAME) | ((unsigned)(va) & ~PG_FRAME))
/*
* macros to generate page directory/table indicies
*/
#define pdei(va) (((va) & PD_MASK) >> PDSHIFT)
#define ptei(va) (((va) & PT_MASK) >> PGSHIFT)
/*
* Pmap stuff
*/
typedef struct pmap {
pd_entry_t *pm_pdir; /* KVA of page directory */
boolean_t pm_pdchanged; /* pdir changed */
short pm_dref; /* page directory ref count */
short pm_count; /* pmap reference count */
simple_lock_data_t pm_lock; /* lock on pmap */
struct pmap_statistics pm_stats; /* pmap statistics */
long pm_ptpages; /* more stats: PT pages */
} *pmap_t;
/*
* For each vm_page_t, there is a list of all currently valid virtual
* mappings of that page. An entry is a pv_entry, the list is pv_table.
*/
struct pv_entry {
struct pv_entry *pv_next; /* next pv_entry */
pmap_t pv_pmap; /* pmap where mapping lies */
vm_offset_t pv_va; /* virtual address for mapping */
};
struct pv_page;
struct pv_page_info {
TAILQ_ENTRY(pv_page) pgi_list;
struct pv_entry *pgi_freelist;
int pgi_nfree;
};
/*
* This is basically:
* ((NBPG - sizeof(struct pv_page_info)) / sizeof(struct pv_entry))
*/
#define NPVPPG 340
struct pv_page {
struct pv_page_info pvp_pgi;
struct pv_entry pvp_pv[NPVPPG];
};
#ifdef _KERNEL
extern struct pmap kernel_pmap_store;
struct pv_entry *pv_table; /* array of entries, one per page */
#define pmap_kernel() (&kernel_pmap_store)
#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
#define pmap_update() tlbflush()
static __inline void
pmap_clear_modify(vm_offset_t pa)
{
pmap_changebit(pa, 0, ~PG_M);
}
static __inline void
pmap_clear_reference(vm_offset_t pa)
{
pmap_changebit(pa, 0, ~PG_U);
}
static __inline void
pmap_copy_on_write(vm_offset_t pa)
{
pmap_changebit(pa, PG_RO, ~PG_RW);
}
static __inline boolean_t
pmap_is_modified(vm_offset_t pa)
{
return pmap_testbit(pa, PG_M);
}
static __inline boolean_t
pmap_is_referenced(vm_offset_t pa)
{
return pmap_testbit(pa, PG_U);
}
static __inline vm_offset_t
pmap_phys_address(int ppn)
{
return i386_ptob(ppn);
}
#endif /* _KERNEL */
#endif /* _I386_PMAP_H_ */
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