271 lines
8.4 KiB
C
271 lines
8.4 KiB
C
/* $NetBSD: pmap.h,v 1.82 2020/03/21 18:47:54 ad 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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* 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. 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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/*
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* Copyright (c) 1987 Carnegie-Mellon University
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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 <sys/atomic.h>
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#include <uvm/uvm_page.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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/*
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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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struct pmap {
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struct pte *pm_p1ap; /* Base of alloced p1 pte space */
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u_int pm_count; /* reference count */
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struct pcb *pm_pcbs; /* 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 pmap_statistics pm_stats; /* Some statistics */
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};
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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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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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ptr = avail_start + KERNBASE; \
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avail_start += (count) * VAX_NBPG;
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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_VTOPHYS(va) ((va) & ~KERNBASE)
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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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static __inline bool
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pmap_extract(pmap_t pmap, vaddr_t va, paddr_t *pap)
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{
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int *pte, sva;
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if (va & KERNBASE) {
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paddr_t pa;
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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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goto fail;
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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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goto fail;
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pte = (int *)pmap->pm_p1br;
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}
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/*
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* Since the PTE tables are sparsely allocated, make sure the page
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* table page actually exists before deferencing the pte itself.
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*/
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if (kvtopte(&pte[sva])->pg_v && (pte[sva] & PG_FRAME)) {
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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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fail:
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if (pap)
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*pap = 0;
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return (false);
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}
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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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static __inline struct pv_entry *
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pmap_pg_to_pv(const struct vm_page *pg)
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{
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return pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT);
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}
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static __inline bool
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pmap_is_referenced(struct vm_page *pg)
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{
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const struct pv_entry * const pv = pmap_pg_to_pv(pg);
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return (pv->pv_attr & PG_V) != 0;
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}
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static __inline 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 * const pv = pmap_pg_to_pv(pg);
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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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static __inline 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 bool
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pmap_remove_all(struct pmap *pmap)
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{
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/* Nothing. */
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return false;
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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_remove(pmap, start, end) pmap_protect(pmap, start, end, 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) atomic_inc_uint(&(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(void);
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vaddr_t pmap_map(vaddr_t, vaddr_t, vaddr_t, int);
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#if 0
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#define __HAVE_VM_PAGE_MD
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struct vm_page_md {
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unsigned int md_attrs;
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};
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#define VM_MDPAGE_INIT(pg) ((pg)->mdpage.md_attrs = 0)
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#endif
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#endif /* PMAP_H */
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