/* $NetBSD: pmap.h,v 1.82 2020/03/21 18:47:54 ad Exp $ */ /* * Copyright (c) 1991 Regents of the University of California. * All rights reserved. * * Changed for the VAX port. /IC * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. 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 7.6 (Berkeley) 5/10/91 */ /* * Copyright (c) 1987 Carnegie-Mellon University * * Changed for the VAX port. /IC * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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 7.6 (Berkeley) 5/10/91 */ #ifndef PMAP_H #define PMAP_H #include <sys/atomic.h> #include <uvm/uvm_page.h> #include <machine/pte.h> #include <machine/mtpr.h> #include <machine/pcb.h> /* * Some constants to make life easier. */ #define LTOHPS (PGSHIFT - VAX_PGSHIFT) #define LTOHPN (1 << LTOHPS) /* * Pmap structure * pm_stack holds lowest allocated memory for the process stack. */ struct pmap { struct pte *pm_p1ap; /* Base of alloced p1 pte space */ u_int pm_count; /* reference count */ struct pcb *pm_pcbs; /* PCBs using this pmap */ struct pte *pm_p0br; /* page 0 base register */ long pm_p0lr; /* page 0 length register */ struct pte *pm_p1br; /* page 1 base register */ long pm_p1lr; /* page 1 length register */ struct pmap_statistics pm_stats; /* Some statistics */ }; /* * For each struct vm_page, there is a list of all currently valid virtual * mappings of that page. An entry is a pv_entry_t, the list is pv_table. */ struct pv_entry { struct pv_entry *pv_next; /* next pv_entry */ vaddr_t pv_vaddr; /* address for this physical page */ struct pmap *pv_pmap; /* pmap this entry belongs to */ int pv_attr; /* write/modified bits */ }; extern struct pv_entry *pv_table; /* Mapping macros used when allocating SPT */ #define MAPVIRT(ptr, count) \ ptr = virtual_avail; \ virtual_avail += (count) * VAX_NBPG; #define MAPPHYS(ptr, count, perm) \ ptr = avail_start + KERNBASE; \ avail_start += (count) * VAX_NBPG; /* * Real nice (fast) routines to get the virtual address of a physical page * (and vice versa). */ #define PMAP_VTOPHYS(va) ((va) & ~KERNBASE) #define PMAP_MAP_POOLPAGE(pa) ((pa) | KERNBASE) #define PMAP_UNMAP_POOLPAGE(va) ((va) & ~KERNBASE) #define PMAP_STEAL_MEMORY /* * This is the by far most used pmap routine. Make it inline. */ static __inline bool pmap_extract(pmap_t pmap, vaddr_t va, paddr_t *pap) { int *pte, sva; if (va & KERNBASE) { paddr_t pa; pa = kvtophys(va); /* Is 0 if not mapped */ if (pap) *pap = pa; if (pa) return (true); return (false); } sva = PG_PFNUM(va); if (va < 0x40000000) { if (sva >= (pmap->pm_p0lr & ~AST_MASK)) goto fail; pte = (int *)pmap->pm_p0br; } else { if (sva < pmap->pm_p1lr) goto fail; pte = (int *)pmap->pm_p1br; } /* * Since the PTE tables are sparsely allocated, make sure the page * table page actually exists before deferencing the pte itself. */ if (kvtopte(&pte[sva])->pg_v && (pte[sva] & PG_FRAME)) { if (pap) *pap = (pte[sva] & PG_FRAME) << VAX_PGSHIFT; return (true); } fail: if (pap) *pap = 0; return (false); } void pmap_page_protect_long(struct pv_entry *, vm_prot_t); void pmap_protect_long(pmap_t, vaddr_t, vaddr_t, vm_prot_t); static __inline struct pv_entry * pmap_pg_to_pv(const struct vm_page *pg) { return pv_table + (VM_PAGE_TO_PHYS(pg) >> PGSHIFT); } static __inline bool pmap_is_referenced(struct vm_page *pg) { const struct pv_entry * const pv = pmap_pg_to_pv(pg); return (pv->pv_attr & PG_V) != 0; } static __inline void pmap_page_protect(struct vm_page *pg, vm_prot_t prot) { struct pv_entry * const pv = pmap_pg_to_pv(pg); if (pv->pv_pmap != NULL || pv->pv_next != NULL) pmap_page_protect_long(pv, prot); } static __inline void pmap_protect(pmap_t pmap, vaddr_t start, vaddr_t end, vm_prot_t prot) { if (pmap->pm_p0lr != 0 || pmap->pm_p1lr != 0x200000 || (start & KERNBASE) != 0) pmap_protect_long(pmap, start, end, prot); } static __inline bool pmap_remove_all(struct pmap *pmap) { /* Nothing. */ return false; } /* Routines that are best to define as macros */ #define pmap_phys_address(phys) ((u_int)(phys) << PGSHIFT) #define pmap_copy(a,b,c,d,e) /* Dont do anything */ #define pmap_update(pmap) /* nothing (yet) */ #define pmap_remove(pmap, start, end) pmap_protect(pmap, start, end, 0) #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) #define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) #define pmap_reference(pmap) atomic_inc_uint(&(pmap)->pm_count) /* These can be done as efficient inline macros */ #define pmap_copy_page(src, dst) \ __asm("addl3 $0x80000000,%0,%%r0;" \ "addl3 $0x80000000,%1,%%r1;" \ "movc3 $4096,(%%r0),(%%r1)" \ :: "r"(src), "r"(dst) \ : "r0","r1","r2","r3","r4","r5"); #define pmap_zero_page(phys) \ __asm("addl3 $0x80000000,%0,%%r0;" \ "movc5 $0,(%%r0),$0,$4096,(%%r0)" \ :: "r"(phys) \ : "r0","r1","r2","r3","r4","r5"); /* Prototypes */ void pmap_bootstrap(void); vaddr_t pmap_map(vaddr_t, vaddr_t, vaddr_t, int); #if 0 #define __HAVE_VM_PAGE_MD struct vm_page_md { unsigned int md_attrs; }; #define VM_MDPAGE_INIT(pg) ((pg)->mdpage.md_attrs = 0) #endif #endif /* PMAP_H */
