pmap.h revision 1.54.26.2
1 /* $NetBSD: pmap.h,v 1.54.26.2 2009/12/30 04:51:26 matt Exp $ */ 2 3 /* 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Ralph Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)pmap.h 8.1 (Berkeley) 6/10/93 35 */ 36 37 /* 38 * Copyright (c) 1987 Carnegie-Mellon University 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Ralph Campbell. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)pmap.h 8.1 (Berkeley) 6/10/93 72 */ 73 74 #ifndef _MIPS_PMAP_H_ 75 #define _MIPS_PMAP_H_ 76 77 #include <mips/cpuregs.h> /* for KSEG0 below */ 78 #include <mips/pte.h> 79 80 /* 81 * The user address space is 2Gb (0x0 - 0x80000000). 82 * User programs are laid out in memory as follows: 83 * address 84 * USRTEXT 0x00001000 85 * USRDATA USRTEXT + text_size 86 * USRSTACK 0x7FFFFFFF 87 * 88 * The user address space is mapped using a two level structure where 89 * virtual address bits 30..22 are used to index into a segment table which 90 * points to a page worth of PTEs (4096 page can hold 1024 PTEs). 91 * Bits 21..12 are then used to index a PTE which describes a page within 92 * a segment. 93 * 94 * The wired entries in the TLB will contain the following: 95 * 0-1 (UPAGES) for curproc user struct and kernel stack. 96 * 97 * Note: The kernel doesn't use the same data structures as user programs. 98 * All the PTE entries are stored in a single array in Sysmap which is 99 * dynamically allocated at boot time. 100 */ 101 102 #define mips_trunc_seg(x) ((vaddr_t)(x) & ~SEGOFSET) 103 #define mips_round_seg(x) (((vaddr_t)(x) + SEGOFSET) & ~SEGOFSET) 104 105 #define PMAP_SEGTABSIZE (1 << (31 - SEGSHIFT)) 106 107 union pt_entry; 108 109 struct segtab { 110 union pt_entry *seg_tab[PMAP_SEGTABSIZE]; 111 }; 112 113 struct pmap; 114 typedef bool (*pte_callback_t)(struct pmap *, vaddr_t, vaddr_t, pt_entry_t *, 115 uintptr_t); 116 pt_entry_t *pmap_pte_lookup(struct pmap *, vaddr_t); 117 pt_entry_t *pmap_pte_reserve(struct pmap *, vaddr_t, int); 118 void pmap_pte_process(struct pmap *, vaddr_t, vaddr_t, pte_callback_t, 119 uintptr_t); 120 void pmap_segtab_activate(struct lwp *); 121 void pmap_segtab_alloc(struct pmap *); 122 void pmap_segtab_free(struct pmap *); 123 124 /* 125 * Machine dependent pmap structure. 126 */ 127 typedef struct pmap { 128 kmutex_t pm_lock; /* lock on pmap */ 129 struct segtab *pm_segtab; /* pointers to pages of PTEs */ 130 int pm_count; /* pmap reference count */ 131 unsigned int pm_asid; /* TLB address space tag */ 132 unsigned int pm_asidgen; /* its generation number */ 133 struct pmap_statistics pm_stats; /* pmap statistics */ 134 } *pmap_t; 135 136 /* 137 * For each struct vm_page, there is a list of all currently valid virtual 138 * mappings of that page. An entry is a pv_entry_t, the list is pv_table. 139 * XXX really should do this as a part of the higher level code. 140 */ 141 typedef struct pv_entry { 142 struct pv_entry *pv_next; /* next pv_entry */ 143 struct pmap *pv_pmap; /* pmap where mapping lies */ 144 vaddr_t pv_va; /* virtual address for mapping */ 145 int pv_flags; /* some flags for the mapping */ 146 } *pv_entry_t; 147 148 #define PV_UNCACHED 0x0001 /* page is mapped uncached */ 149 #define PV_MODIFIED 0x0002 /* page has been modified */ 150 #define PV_REFERENCED 0x0004 /* page has been recently referenced */ 151 152 153 #ifdef _KERNEL 154 155 extern char *pmap_attributes; /* reference and modify bits */ 156 extern struct pmap kernel_pmap_store; 157 158 #define pmap_kernel() (&kernel_pmap_store) 159 #define pmap_wired_count(pmap) ((pmap)->pm_stats.wired_count) 160 #define pmap_resident_count(pmap) ((pmap)->pm_stats.resident_count) 161 162 #define pmap_update(pmap) /* nothing (yet) */ 163 #define pmap_phys_address(x) mips_ptob(x) 164 165 static __inline void 166 pmap_remove_all(struct pmap *pmap) 167 { 168 /* Nothing. */ 169 } 170 171 /* 172 * Bootstrap the system enough to run with virtual memory. 173 */ 174 void pmap_bootstrap(void); 175 176 void pmap_set_modified(paddr_t); 177 178 void pmap_procwr(struct proc *, vaddr_t, size_t); 179 #define PMAP_NEED_PROCWR 180 181 /* 182 * pmap_prefer() helps reduce virtual-coherency exceptions in 183 * the virtually-indexed cache on mips3 CPUs. 184 */ 185 #ifdef MIPS3_PLUS 186 #define PMAP_PREFER(pa, va, sz, td) pmap_prefer((pa), (va), (td)) 187 void pmap_prefer(vaddr_t, vaddr_t *, int); 188 #endif /* MIPS3_PLUS */ 189 190 #define PMAP_STEAL_MEMORY /* enable pmap_steal_memory() */ 191 192 /* 193 * Alternate mapping hooks for pool pages. Avoids thrashing the TLB. 194 */ 195 vaddr_t mips_pmap_map_poolpage(paddr_t); 196 paddr_t mips_pmap_unmap_poolpage(vaddr_t); 197 struct vm_page *mips_pmap_alloc_poolpage(int); 198 #define PMAP_ALLOC_POOLPAGE(flags) mips_pmap_alloc_poolpage(flags) 199 #define PMAP_MAP_POOLPAGE(pa) mips_pmap_map_poolpage(pa) 200 #define PMAP_UNMAP_POOLPAGE(va) mips_pmap_unmap_poolpage(va) 201 202 /* 203 * Other hooks for the pool allocator. 204 */ 205 #ifdef _LP64 206 #define POOL_VTOPHYS(va) (MIPS_KSEG0_P(va) \ 207 ? MIPS_KSEG0_TO_PHYS(va) \ 208 : MIPS_XKPHYS_TO_PHYS(va)) 209 #else 210 #define POOL_VTOPHYS(va) MIPS_KSEG0_TO_PHYS((vaddr_t)(va)) 211 #endif 212 213 /* 214 * Select CCA to use for unmanaged pages. 215 */ 216 #define PMAP_CCA_FOR_PA(pa) CCA_UNCACHED /* uncached */ 217 218 #if defined(_MIPS_PADDR_T_64BIT) || defined(_LP64) 219 #define PMAP_NOCACHE 0x4000000000000000ULL 220 #endif 221 222 #endif /* _KERNEL */ 223 #endif /* _MIPS_PMAP_H_ */ 224
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