257 lines
7.5 KiB
C
257 lines
7.5 KiB
C
/* $NetBSD: pmap.h,v 1.58 2003/03/02 22:19:06 ragge Exp $ */
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/*
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* Copyright (c) 1987 Carnegie-Mellon University
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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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* Changed for the VAX port. /IC
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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.
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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 7.6 (Berkeley) 5/10/91
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*/
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#ifndef PMAP_H
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#define PMAP_H
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#include <machine/pte.h>
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#include <machine/mtpr.h>
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#include <machine/pcb.h>
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/*
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* Some constants to make life easier.
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*/
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#define LTOHPS (PGSHIFT - VAX_PGSHIFT)
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#define LTOHPN (1 << LTOHPS)
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#if USE_TOPDOWN_VM==0
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#define PROCPTSIZE ((MAXTSIZ + MAXDSIZ + MAXSSIZ + MMAPSPACE) / VAX_NBPG)
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#endif
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/*
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* Link struct if more than one process share pmap (like vfork).
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* This is rarely used.
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*/
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struct pm_share {
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struct pm_share *ps_next;
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struct pcb *ps_pcb;
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};
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/*
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* Pmap structure
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* pm_stack holds lowest allocated memory for the process stack.
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*/
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typedef struct pmap {
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struct pte *pm_p1ap; /* Base of alloced p1 pte space */
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int pm_count; /* reference count */
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struct pm_share *pm_share; /* PCBs using this pmap */
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struct pte *pm_p0br; /* page 0 base register */
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long pm_p0lr; /* page 0 length register */
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struct pte *pm_p1br; /* page 1 base register */
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long pm_p1lr; /* page 1 length register */
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struct simplelock pm_lock; /* Lock entry in MP environment */
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struct pmap_statistics pm_stats; /* Some statistics */
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} *pmap_t;
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/*
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* For each struct vm_page, 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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struct pv_entry {
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struct pv_entry *pv_next; /* next pv_entry */
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vaddr_t pv_vaddr; /* address for this physical page */
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struct pmap *pv_pmap; /* pmap this entry belongs to */
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int pv_attr; /* write/modified bits */
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};
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extern struct pv_entry *pv_table;
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/* Mapping macros used when allocating SPT */
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#define MAPVIRT(ptr, count) \
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(vaddr_t)ptr = virtual_avail; \
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virtual_avail += (count) * VAX_NBPG;
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#define MAPPHYS(ptr, count, perm) \
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(vaddr_t)ptr = avail_start + KERNBASE; \
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avail_start += (count) * VAX_NBPG;
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#ifdef _KERNEL
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extern struct pmap kernel_pmap_store;
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#define pmap_kernel() (&kernel_pmap_store)
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#endif /* _KERNEL */
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/*
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* Real nice (fast) routines to get the virtual address of a physical page
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* (and vice versa).
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*/
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#define PMAP_MAP_POOLPAGE(pa) ((pa) | KERNBASE)
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#define PMAP_UNMAP_POOLPAGE(va) ((va) & ~KERNBASE)
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#define PMAP_STEAL_MEMORY
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/*
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* This is the by far most used pmap routine. Make it inline.
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*/
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__inline static boolean_t
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pmap_extract(pmap_t pmap, vaddr_t va, paddr_t *pap)
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{
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paddr_t pa = 0;
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int *pte, sva;
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if (va & KERNBASE) {
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pa = kvtophys(va); /* Is 0 if not mapped */
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if (pap)
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*pap = pa;
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if (pa)
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return (TRUE);
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return (FALSE);
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}
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sva = PG_PFNUM(va);
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if (va < 0x40000000) {
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if (sva > (pmap->pm_p0lr & ~AST_MASK))
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return FALSE;
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pte = (int *)pmap->pm_p0br;
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} else {
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if (sva < pmap->pm_p1lr)
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return FALSE;
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pte = (int *)pmap->pm_p1br;
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}
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if (kvtopte(&pte[sva])->pg_pfn) {
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if (pap)
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*pap = (pte[sva] & PG_FRAME) << VAX_PGSHIFT;
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return (TRUE);
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}
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return (FALSE);
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}
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boolean_t pmap_clear_modify_long(struct pv_entry *);
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boolean_t pmap_clear_reference_long(struct pv_entry *);
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boolean_t pmap_is_modified_long(struct pv_entry *);
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void pmap_page_protect_long(struct pv_entry *, vm_prot_t);
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void pmap_protect_long(pmap_t, vaddr_t, vaddr_t, vm_prot_t);
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__inline static boolean_t
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pmap_clear_reference(struct vm_page *pg)
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{
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struct pv_entry *pv = pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT);
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boolean_t rv = (pv->pv_attr & PG_V) != 0;
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pv->pv_attr &= ~PG_V;
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if (pv->pv_pmap != NULL || pv->pv_next != NULL)
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rv |= pmap_clear_reference_long(pv);
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return rv;
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}
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__inline static boolean_t
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pmap_clear_modify(struct vm_page *pg)
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{
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struct pv_entry *pv = pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT);
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boolean_t rv = (pv->pv_attr & PG_M) != 0;
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pv->pv_attr &= ~PG_M;
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if (pv->pv_pmap != NULL || pv->pv_next != NULL)
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rv |= pmap_clear_modify_long(pv);
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return rv;
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}
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__inline static boolean_t
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pmap_is_modified(struct vm_page *pg)
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{
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struct pv_entry *pv = pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT);
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if (pv->pv_attr & PG_M)
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return 1;
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else
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return pmap_is_modified_long(pv);
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}
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__inline static void
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pmap_page_protect(struct vm_page *pg, vm_prot_t prot)
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{
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struct pv_entry *pv = pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT);
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if (pv->pv_pmap != NULL || pv->pv_next != NULL)
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pmap_page_protect_long(pv, prot);
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}
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__inline static void
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pmap_protect(pmap_t pmap, vaddr_t start, vaddr_t end, vm_prot_t prot)
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{
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if (pmap->pm_p0lr != 0 || pmap->pm_p1lr != 0x200000 ||
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(start & KERNBASE) != 0)
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pmap_protect_long(pmap, start, end, prot);
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}
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static __inline void
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pmap_remove_all(struct pmap *pmap)
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{
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/* Nothing. */
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}
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/* Routines that are best to define as macros */
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#define pmap_phys_address(phys) ((u_int)(phys) << PGSHIFT)
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#define pmap_copy(a,b,c,d,e) /* Dont do anything */
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#define pmap_update(pmap) /* nothing (yet) */
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#define pmap_collect(pmap) /* No need so far */
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#define pmap_remove(pmap, start, slut) pmap_protect(pmap, start, slut, 0)
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#define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count)
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#define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count)
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#define pmap_reference(pmap) (pmap)->pm_count++
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/* These can be done as efficient inline macros */
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#define pmap_copy_page(src, dst) \
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__asm__("addl3 $0x80000000,%0,%%r0;" \
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"addl3 $0x80000000,%1,%%r1;" \
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"movc3 $4096,(%%r0),(%%r1)" \
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:: "r"(src), "r"(dst) \
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: "r0","r1","r2","r3","r4","r5");
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#define pmap_zero_page(phys) \
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__asm__("addl3 $0x80000000,%0,%%r0;" \
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"movc5 $0,(%%r0),$0,$4096,(%%r0)" \
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:: "r"(phys) \
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: "r0","r1","r2","r3","r4","r5");
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/* Prototypes */
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void pmap_bootstrap __P((void));
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vaddr_t pmap_map __P((vaddr_t, vaddr_t, vaddr_t, int));
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#endif /* PMAP_H */
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