284 lines
9.5 KiB
C
284 lines
9.5 KiB
C
/*
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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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* 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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* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
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* $Id: pmap.h,v 1.11 1994/03/07 11:38:48 davidg Exp $
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*/
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#ifndef _PMAP_MACHINE_
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#define _PMAP_MACHINE_ 1
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#include "vm/vm_prot.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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struct pde
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{
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unsigned int
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pd_v:1, /* valid bit */
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pd_prot:2, /* access control */
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pd_mbz1:2, /* reserved, must be zero */
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pd_u:1, /* hardware maintained 'used' bit */
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:1, /* not used */
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pd_mbz2:2, /* reserved, must be zero */
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:3, /* reserved for software */
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pd_pfnum:20; /* physical page frame number of pte's*/
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};
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#define PD_MASK 0xffc00000UL /* page directory address bits */
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#define PT_MASK 0x003ff000UL /* page table address bits */
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#define PD_SHIFT 22 /* page directory address shift */
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#define PG_SHIFT 12 /* page table address shift */
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struct pte
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{
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unsigned int
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pg_v:1, /* valid bit */
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pg_prot:2, /* access control */
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pg_mbz1:2, /* reserved, must be zero */
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pg_u:1, /* hardware maintained 'used' bit */
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pg_m:1, /* hardware maintained modified bit */
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pg_mbz2:2, /* reserved, must be zero */
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pg_w:1, /* software, wired down page */
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:1, /* software (unused) */
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pg_nc:1, /* 'uncacheable page' bit */
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pg_pfnum:20; /* physical page frame number */
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};
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#define PG_V 0x00000001
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#define PG_RO 0x00000000
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#define PG_RW 0x00000002
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#define PG_u 0x00000004
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#define PG_PROT 0x00000006 /* all protection bits . */
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#define PG_W 0x00000200
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#define PG_N 0x00000800 /* Non-cacheable */
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#define PG_M 0x00000040
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#define PG_U 0x00000020
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#define PG_FRAME 0xfffff000UL
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#define PG_NOACC 0
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#define PG_KR 0x00000000
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#define PG_KW 0x00000002
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#define PG_URKR 0x00000004
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#define PG_URKW 0x00000004
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#define PG_UW 0x00000006
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/* Garbage for current bastardized pager that assumes a hp300 */
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#define PG_NV 0
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#define PG_CI 0
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/*
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* Page Protection Exception bits
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*/
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#define PGEX_P 0x01 /* Protection violation vs. not present */
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#define PGEX_W 0x02 /* during a Write cycle */
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#define PGEX_U 0x04 /* access from User mode (UPL) */
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/* typedef struct pde pd_entry_t; */ /* page directory entry */
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/* typedef struct pte pt_entry_t; */ /* Mach page table entry */
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typedef unsigned int *pd_entry_t;
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typedef unsigned int *pt_entry_t;
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/*
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* NKPDE controls the virtual space of the kernel, what ever is left, minus
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* the alternate page table area is given to the user (NUPDE)
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*/
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/*
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* NKPDE controls the virtual space of the kernel, what ever is left is
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* given to the user (NUPDE)
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*/
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#ifndef NKPT
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#define NKPT 15 /* actual number of kernel pte's */
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#endif
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#ifndef NKPDE
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#define NKPDE 63 /* addressable number of kpte's */
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#endif
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#define NUPDE (NPTEPG-NKPDE) /* number of user pde's */
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/*
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* The *PTDI values control the layout of virtual memory
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*
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* XXX This works for now, but I am not real happy with it, I'll fix it
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* right after I fix locore.s and the magic 28K hole
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*/
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#define APTDPTDI (NPTEPG-1) /* alt ptd entry that points to APTD */
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#define KPTDI (APTDPTDI-NKPDE)/* start of kernel virtual pde's */
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#define PTDPTDI (KPTDI-1) /* ptd entry that points to ptd! */
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#define KSTKPTDI (PTDPTDI-1) /* ptd entry for u./kernel&user stack */
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#define KSTKPTEOFF (NBPG/sizeof(pd_entry_t)-UPAGES) /* pte entry for kernel stack */
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#define PDESIZE sizeof(pd_entry_t) /* for assembly files */
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#define PTESIZE sizeof(pt_entry_t) /* for assembly files */
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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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#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) (((int) (*vtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET))
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#define ispt(va) ((va) >= UPT_MIN_ADDRESS && (va) <= KPT_MAX_ADDRESS)
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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) (((int) (*avtopte(va))&PG_FRAME) | ((int)(va) & PGOFSET))
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/*
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* Routine: pmap_kextract
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* Function:
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* Extract the physical page address associated
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* kernel virtual address.
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*/
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static inline vm_offset_t
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pmap_kextract(va)
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vm_offset_t va;
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{
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vm_offset_t pa = *(int *)vtopte(va);
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pa = (pa & PG_FRAME) | (va & ~PG_FRAME);
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return pa;
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}
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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)>>PD_SHIFT)
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#define ptei(va) (((va)&PT_MASK)>>PG_SHIFT)
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/*
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* Pmap stuff
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*/
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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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};
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typedef struct pmap *pmap_t;
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#ifdef KERNEL
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extern pmap_t kernel_pmap;
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#endif
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/*
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* Macros for speed
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*/
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#define PMAP_ACTIVATE(pmapp, pcbp) \
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if ((pmapp) != NULL /*&& (pmapp)->pm_pdchanged */) { \
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(pcbp)->pcb_cr3 = \
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pmap_extract(kernel_pmap, (vm_offset_t)(pmapp)->pm_pdir); \
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if ((pmapp) == &curproc->p_vmspace->vm_pmap) \
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load_cr3((pcbp)->pcb_cr3); \
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(pmapp)->pm_pdchanged = FALSE; \
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}
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#define PMAP_DEACTIVATE(pmapp, pcbp)
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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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*/
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typedef 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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} *pv_entry_t;
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#define PV_ENTRY_NULL ((pv_entry_t) 0)
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#define PV_CI 0x01 /* all entries must be cache inhibited */
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#define PV_PTPAGE 0x02 /* entry maps a page table page */
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#ifdef KERNEL
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pv_entry_t pv_table; /* array of entries, one per page */
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#define pa_index(pa) atop(pa - vm_first_phys)
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#define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
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#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
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extern pmap_t pmap_create(vm_size_t);
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extern void pmap_pinit(struct pmap *);
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extern void pmap_destroy(pmap_t);
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extern void pmap_release(struct pmap *);
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extern void pmap_reference(pmap_t);
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extern void pmap_remove(struct pmap *, vm_offset_t, vm_offset_t);
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extern void pmap_protect(struct pmap *, vm_offset_t, vm_offset_t, vm_prot_t);
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extern void pmap_enter(pmap_t, vm_offset_t, vm_offset_t, vm_prot_t, boolean_t);
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extern void pmap_change_wiring(pmap_t, vm_offset_t, boolean_t);
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extern inline pt_entry_t *pmap_pte(pmap_t, vm_offset_t);
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extern vm_offset_t pmap_extract(pmap_t, vm_offset_t);
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extern void pmap_copy(pmap_t, pmap_t, vm_offset_t, vm_size_t, vm_offset_t);
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extern void pmap_collect(pmap_t);
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struct pcb; extern void pmap_activate(pmap_t, struct pcb *);
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extern pmap_t pmap_kernel(void);
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extern void pmap_pageable(pmap_t, vm_offset_t, vm_offset_t, boolean_t);
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#endif /* KERNEL */
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#endif /* _PMAP_MACHINE_ */
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