pmap.h revision 1.24
1 /* $NetBSD: pmap.h,v 1.24 2001/09/10 21:19:19 chris Exp $ */ 2 3 /* 4 * Copyright (c) 1987 Carnegie-Mellon University 5 * Copyright (c) 1991, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)pmap.h 8.1 (Berkeley) 6/10/93 41 */ 42 43 #ifndef _MACHINE_PMAP_H_ 44 #define _MACHINE_PMAP_H_ 45 46 #include <machine/pte.h> 47 48 /* 49 * Pmap stuff 50 */ 51 struct pmap { 52 pt_entry_t *pm_ptab; /* KVA of page table */ 53 st_entry_t *pm_stab; /* KVA of segment table */ 54 int pm_stfree; /* 040: free lev2 blocks */ 55 st_entry_t *pm_stpa; /* 040: ST phys addr */ 56 short pm_sref; /* segment table ref count */ 57 short pm_count; /* pmap reference count */ 58 struct simplelock pm_lock; /* lock on pmap */ 59 struct pmap_statistics pm_stats; /* pmap statistics */ 60 long pm_ptpages; /* more stats: PT pages */ 61 }; 62 63 typedef struct pmap *pmap_t; 64 65 /* 66 * On the 040 we keep track of which level 2 blocks are already in use 67 * with the pm_stfree mask. Bits are arranged from LSB (block 0) to MSB 68 * (block 31). For convenience, the level 1 table is considered to be 69 * block 0. 70 * 71 * MAX[KU]L2SIZE control how many pages of level 2 descriptors are allowed. 72 * for the kernel and users. 8 implies only the initial "segment table" 73 * page is used. WARNING: don't change MAXUL2SIZE unless you can allocate 74 * physically contiguous pages for the ST in pmap.c! 75 */ 76 #define MAXKL2SIZE 32 77 #define MAXUL2SIZE 8 78 #define l2tobm(n) (1 << (n)) 79 #define bmtol2(n) (ffs(n) - 1) 80 81 /* 82 * Macros for speed 83 */ 84 #define PMAP_ACTIVATE(pmap, loadhw) \ 85 { \ 86 if ((loadhw)) \ 87 loadustp(m68k_btop((paddr_t)(pmap)->pm_stpa)); \ 88 } 89 90 /* 91 * For each struct vm_page, there is a list of all currently valid virtual 92 * mappings of that page. An entry is a pv_entry, the list is pv_table. 93 */ 94 struct pv_entry { 95 struct pv_entry *pv_next; /* next pv_entry */ 96 struct pmap *pv_pmap; /* pmap where mapping lies */ 97 vaddr_t pv_va; /* virtual address for mapping */ 98 st_entry_t *pv_ptste; /* non-zero if VA maps a PT page */ 99 struct pmap *pv_ptpmap; /* if pv_ptste, pmap for PT page */ 100 int pv_flags; /* flags */ 101 }; 102 103 #define PV_CI 0x01 /* header: all entries are cache inhibited */ 104 #define PV_PTPAGE 0x02 /* header: entry maps a page table page */ 105 106 struct pv_page; 107 108 struct pv_page_info { 109 TAILQ_ENTRY(pv_page) pgi_list; 110 struct pv_entry *pgi_freelist; 111 int pgi_nfree; 112 }; 113 114 /* 115 * This is basically: 116 * ((NBPG - sizeof(struct pv_page_info)) / sizeof(struct pv_entry)) 117 */ 118 #define NPVPPG 170 119 120 struct pv_page { 121 struct pv_page_info pvp_pgi; 122 struct pv_entry pvp_pv[NPVPPG]; 123 }; 124 125 #ifdef _KERNEL 126 127 extern struct pmap kernel_pmap_store; 128 129 #define pmap_kernel() (&kernel_pmap_store) 130 #define active_pmap(pm) \ 131 ((pm) == pmap_kernel() || (pm) == curproc->p_vmspace->vm_map.pmap) 132 #define active_user_pmap(pm) \ 133 (curproc && \ 134 (pm) != pmap_kernel() && (pm) == curproc->p_vmspace->vm_map.pmap) 135 136 extern void _pmap_set_page_cacheable __P((struct pmap *, vaddr_t)); 137 extern void _pmap_set_page_cacheinhibit __P((struct pmap *, vaddr_t)); 138 extern int _pmap_page_is_cacheable __P((struct pmap *, vaddr_t)); 139 140 extern struct pv_entry *pv_table; /* array of entries, one per page */ 141 142 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 143 #define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) 144 145 #define pmap_update(pmap) /* nothing (yet) */ 146 147 extern pt_entry_t *Sysmap; 148 extern char *vmmap; /* map for mem, dumps, etc. */ 149 150 vaddr_t pmap_map __P((vaddr_t, paddr_t, paddr_t, int)); 151 void pmap_procwr __P((struct proc *, vaddr_t, size_t)); 152 #define PMAP_NEED_PROCWR 153 154 /* 155 * Do idle page zero'ing uncached to avoid polluting the cache. 156 */ 157 boolean_t pmap_zero_page_uncached(paddr_t); 158 #define PMAP_PAGEIDLEZERO(pa) pmap_zero_page_uncached((pa)) 159 160 #endif /* _KERNEL */ 161 162 #endif /* !_MACHINE_PMAP_H_ */ 163
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