pmap.h revision 1.5.2.2
1 /* 2 * Copyright (c) 1991 Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * the Systems Programming Group of the University of Utah Computer 7 * Science Department and William Jolitz of UUNET Technologies Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * from: @(#)pmap.h 7.4 (Berkeley) 5/12/91 38 * $Id: pmap.h,v 1.5.2.2 1993/10/15 13:12:48 mycroft Exp $ 39 */ 40 41 /* 42 * Derived from hp300 version by Mike Hibler, this version by William 43 * Jolitz uses a recursive map [a pde points to the page directory] to 44 * map the page tables using the pagetables themselves. This is done to 45 * reduce the impact on kernel virtual memory for lots of sparse address 46 * space, and to reduce the cost of memory to each process. 47 * 48 * from hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90 49 */ 50 51 #ifndef _I386_PMAP_H_ 52 #define _I386_PMAP_H_ 53 54 #include <machine/pte.h> 55 56 /* 57 * 386 page table entry and page table directory 58 * W.Jolitz, 8/89 59 */ 60 61 /* 62 * One page directory, shared between 63 * kernel and user modes. 64 */ 65 #define I386_PAGE_SIZE NBPG 66 #define I386_PDR_SIZE NBPD 67 68 #define UPTDI 0x3f6 /* ptd entry for u./kernel&user stack */ 69 #define PTDPTDI 0x3f7 /* ptd entry that points to ptd! */ 70 #define KPTDI_FIRST 0x3f8 /* start of kernel virtual pde's */ 71 #define KPTDI_LAST 0x3fA /* last of kernel virtual pde's */ 72 73 /* 74 * Address of current and alternate address space page table maps 75 * and directories. 76 */ 77 #ifdef KERNEL 78 extern struct pte PTmap[], APTmap[], Upte; 79 extern struct pde PTD[], APTD[], PTDpde, APTDpde, Upde; 80 extern pt_entry_t *Sysmap; 81 82 extern int IdlePTD; /* physical address of "Idle" state directory */ 83 #endif 84 85 /* 86 * virtual address to page table entry and 87 * to physical address. Likewise for alternate address space. 88 * Note: these work recursively, thus vtopte of a pte will give 89 * the corresponding pde that in turn maps it. 90 */ 91 #define vtopte(va) (PTmap + i386_btop(va)) 92 #define kvtopte(va) vtopte(va) 93 #define ptetov(pt) (i386_ptob(pt - PTmap)) 94 #define vtophys(va) (i386_ptob(vtopte(va)->pg_pfnum) | ((int)(va) & PGOFSET)) 95 96 #define avtopte(va) (APTmap + i386_btop(va)) 97 #define ptetoav(pt) (i386_ptob(pt - APTmap)) 98 #define avtophys(va) (i386_ptob(avtopte(va)->pg_pfnum) | ((int)(va) & PGOFSET)) 99 100 /* 101 * macros to generate page directory/table indicies 102 */ 103 104 #define pdei(va) (((va)&PD_MASK)>>PDSHIFT) 105 #define ptei(va) (((va)&PT_MASK)>>PGSHIFT) 106 107 /* 108 * Pmap stuff 109 */ 110 111 struct pmap { 112 pd_entry_t *pm_pdir; /* KVA of page directory */ 113 boolean_t pm_pdchanged; /* pdir changed */ 114 short pm_dref; /* page directory ref count */ 115 short pm_count; /* pmap reference count */ 116 simple_lock_data_t pm_lock; /* lock on pmap */ 117 struct pmap_statistics pm_stats; /* pmap statistics */ 118 long pm_ptpages; /* more stats: PT pages */ 119 }; 120 121 typedef struct pmap *pmap_t; 122 123 #ifdef KERNEL 124 extern pmap_t kernel_pmap; 125 #endif 126 127 /* 128 * Macros for speed 129 */ 130 #define PMAP_ACTIVATE(pmapp, pcbp) \ 131 if ((pmapp) != NULL /*&& (pmapp)->pm_pdchanged */) { \ 132 (pcbp)->pcb_cr3 = \ 133 pmap_extract(kernel_pmap, (pmapp)->pm_pdir); \ 134 if ((pmapp) == &curproc->p_vmspace->vm_pmap) \ 135 lcr3((pcbp)->pcb_cr3); \ 136 (pmapp)->pm_pdchanged = FALSE; \ 137 } 138 139 #define PMAP_DEACTIVATE(pmapp, pcbp) 140 141 /* 142 * For each vm_page_t, there is a list of all currently valid virtual 143 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 144 */ 145 typedef struct pv_entry { 146 struct pv_entry *pv_next; /* next pv_entry */ 147 pmap_t pv_pmap; /* pmap where mapping lies */ 148 vm_offset_t pv_va; /* virtual address for mapping */ 149 int pv_flags; /* flags */ 150 } *pv_entry_t; 151 152 #ifdef KERNEL 153 154 pv_entry_t pv_table; /* array of entries, one per page */ 155 156 #define pa_to_pvh(pa) (&pv_table[pmap_page_index(pa)]) 157 void pmap_bootstrap __P((vm_offset_t start)); 158 159 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 160 161 #endif /* KERNEL */ 162 163 #endif /* _I386_PMAP_H_ */ 164
Indexes created Wed Oct 22 13:09:56 GMT 2025