1 /* $NetBSD: pmap.h,v 1.16 2001/04/22 23:19:30 thorpej Exp $ */ 2 3 /*- 4 * Copyright (C) 1995, 1996 Wolfgang Solfrank. 5 * Copyright (C) 1995, 1996 TooLs GmbH. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by TooLs GmbH. 19 * 4. The name of TooLs GmbH may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #ifndef _MACHINE_PMAP_H_ 35 #define _MACHINE_PMAP_H_ 36 37 #ifndef _LOCORE 38 #include <machine/pte.h> 39 #ifdef _KERNEL 40 #include <sys/queue.h> 41 #endif 42 #include <sys/mutex.h> 43 #endif 44 45 /* 46 * This scheme uses 2-level page tables. 47 * 48 * While we're still in 32-bit mode we do the following: 49 * 50 * offset: 13 bits 51 * 1st level: 1024 64-bit TTEs in an 8K page for 10 bits 52 * 2nd level: 512 32-bit pointers in the pmap for 9 bits 53 * ------- 54 * total: 32 bits 55 * 56 * In 64-bit mode the Spitfire and Blackbird CPUs support only 57 * 44-bit virtual addresses. All addresses between 58 * 0x0000 07ff ffff ffff and 0xffff f800 0000 0000 are in the 59 * "VA hole" and trap, so we don't have to track them. However, 60 * we do need to keep them in mind during PT walking. If they 61 * ever change the size of the address "hole" we need to rework 62 * all the page table handling. 63 * 64 * offset: 13 bits 65 * 1st level: 1024 64-bit TTEs in an 8K page for 10 bits 66 * 2nd level: 1024 64-bit pointers in an 8K page for 10 bits 67 * 3rd level: 1024 64-bit pointers in the segmap for 10 bits 68 * ------- 69 * total: 43 bits 70 * 71 * Of course, this means for 32-bit spaces we always have a (practically) 72 * wasted page for the segmap (only one entry used) and half a page wasted 73 * for the page directory. We still have need of one extra bit 8^(. 74 */ 75 76 #define HOLESHIFT (43) 77 78 #define PTSZ (PAGE_SIZE/8) 79 #define PDSZ (PTSZ) 80 #define STSZ (PTSZ) 81 82 #define PTSHIFT (13) 83 #define PDSHIFT (10+PTSHIFT) 84 #define STSHIFT (10+PDSHIFT) 85 86 #define PTMASK (PTSZ-1) 87 #define PDMASK (PDSZ-1) 88 #define STMASK (STSZ-1) 89 90 #ifndef _LOCORE 91 92 #define va_to_seg(v) (int)((((paddr_t)(v))>>STSHIFT)&STMASK) 93 #define va_to_dir(v) (int)((((paddr_t)(v))>>PDSHIFT)&PDMASK) 94 #define va_to_pte(v) (int)((((paddr_t)(v))>>PTSHIFT)&PTMASK) 95 96 #ifdef _KERNEL 97 98 /* 99 * Support for big page sizes. This maps the page size to the 100 * page bits. 101 */ 102 struct page_size_map { 103 u_int64_t mask; 104 u_int64_t code; 105 #ifdef DEBUG 106 u_int64_t use; 107 #endif 108 }; 109 extern struct page_size_map page_size_map[]; 110 111 struct pmap { 112 struct mutex pm_mtx; 113 int pm_ctx; /* Current context */ 114 int pm_refs; /* ref count */ 115 /* 116 * This contains 64-bit pointers to pages that contain 117 * 1024 64-bit pointers to page tables. All addresses 118 * are physical. 119 * 120 * !!! Only touch this through pseg_get() and pseg_set() !!! 121 */ 122 paddr_t pm_physaddr; /* physical address of pm_segs */ 123 int64_t *pm_segs; 124 125 struct pmap_statistics pm_stats; 126 }; 127 128 /* 129 * This comes from the PROM and is used to map prom entries. 130 */ 131 struct prom_map { 132 u_int64_t vstart; 133 u_int64_t vsize; 134 u_int64_t tte; 135 }; 136 137 #define PMAP_NC 0x001 /* Set the E bit in the page */ 138 #define PMAP_NVC 0x002 /* Don't enable the virtual cache */ 139 #define PMAP_NOCACHE PMAP_NC 140 #define PMAP_LITTLE 0x004 /* Map in little endian mode */ 141 /* Large page size hints -- we really should use another param to pmap_enter() */ 142 #define PMAP_8K 0x000 143 #define PMAP_64K 0x008 /* Use 64K page */ 144 #define PMAP_512K 0x010 145 #define PMAP_4M 0x018 146 #define PMAP_SZ_TO_TTE(x) (((x)&0x018)<<58) 147 /* If these bits are different in va's to the same PA then there is an aliasing in the d$ */ 148 #define VA_ALIAS_MASK (1<<13) /* = (VA_ALIAS_ALIGN - 1) & ~PAGE_MASK */ 149 #define VA_ALIAS_ALIGN (1<<14) 150 151 typedef struct pmap *pmap_t; 152 153 /* 154 * Encode IO space for pmap_enter() 155 * 156 * Since sun4u machines don't have separate IO spaces, this is a noop. 157 */ 158 #define PMAP_IOENC(io) 0 159 160 extern struct pmap kernel_pmap_; 161 #define pmap_kernel() (&kernel_pmap_) 162 163 /* int pmap_change_wiring(pmap_t pm, vaddr_t va, boolean_t wired); */ 164 #define pmap_resident_count(pm) ((pm)->pm_stats.resident_count) 165 #define pmap_update(pm) /* nothing (yet) */ 166 167 #define pmap_proc_iflush(p,va,len) /* nothing */ 168 169 void pmap_bootstrap(u_long, u_long, u_int, u_int); 170 /* make sure all page mappings are modulo 16K to prevent d$ aliasing */ 171 #define PMAP_PREFER(pa, va) ((va) + (((va) ^ (pa)) & VA_ALIAS_MASK)) 172 173 /* pmap prefer alignment */ 174 #define PMAP_PREFER_ALIGN() (VA_ALIAS_ALIGN) 175 /* pmap prefer offset in alignment */ 176 #define PMAP_PREFER_OFFSET(of) ((of) & VA_ALIAS_MASK) 177 178 #define PMAP_GROWKERNEL /* turn on pmap_growkernel interface */ 179 180 /* SPARC specific? */ 181 void pmap_redzone(void); 182 int pmap_dumpsize(void); 183 int pmap_dumpmmu(int (*)(dev_t, daddr_t, caddr_t, size_t), daddr_t); 184 int pmap_pa_exists(paddr_t); 185 struct proc; 186 void switchexit(struct proc *); 187 188 /* SPARC64 specific */ 189 int ctx_alloc(struct pmap*); 190 void ctx_free(struct pmap*); 191 192 #endif /* _KERNEL */ 193 194 /* 195 * For each struct vm_page, there is a list of all currently valid virtual 196 * mappings of that page. 197 */ 198 typedef struct pv_entry { 199 struct pv_entry *pv_next; /* next pv_entry */ 200 struct pmap *pv_pmap; /* pmap where mapping lies */ 201 vaddr_t pv_va; /* virtual address for mapping */ 202 } *pv_entry_t; 203 /* PV flags encoded in the low bits of the VA of the first pv_entry */ 204 205 struct vm_page_md { 206 struct mutex pvmtx; 207 struct pv_entry pvent; 208 }; 209 210 #define VM_MDPAGE_INIT(pg) do { \ 211 mtx_init(&(pg)->mdpage.pvmtx, IPL_VM); \ 212 (pg)->mdpage.pvent.pv_next = NULL; \ 213 (pg)->mdpage.pvent.pv_pmap = NULL; \ 214 (pg)->mdpage.pvent.pv_va = 0; \ 215 } while (0) 216 217 #endif /* _LOCORE */ 218 #endif /* _MACHINE_PMAP_H_ */ 219