pmap.h revision 1.23
1 /* $NetBSD: pmap.h,v 1.23 2002/09/22 07:19:45 chs 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 #include <sys/queue.h> 40 #include <uvm/uvm_object.h> 41 #endif 42 43 /* 44 * This scheme uses 2-level page tables. 45 * 46 * While we're still in 32-bit mode we do the following: 47 * 48 * offset: 13 bits 49 * 1st level: 1024 64-bit TTEs in an 8K page for 10 bits 50 * 2nd level: 512 32-bit pointers in the pmap for 9 bits 51 * ------- 52 * total: 32 bits 53 * 54 * In 64-bit mode the Spitfire and Blackbird CPUs support only 55 * 44-bit virtual addresses. All addresses between 56 * 0x0000 07ff ffff ffff and 0xffff f800 0000 0000 are in the 57 * "VA hole" and trap, so we don't have to track them. However, 58 * we do need to keep them in mind during PT walking. If they 59 * ever change the size of the address "hole" we need to rework 60 * all the page table handling. 61 * 62 * offset: 13 bits 63 * 1st level: 1024 64-bit TTEs in an 8K page for 10 bits 64 * 2nd level: 1024 64-bit pointers in an 8K page for 10 bits 65 * 3rd level: 1024 64-bit pointers in the segmap for 10 bits 66 * ------- 67 * total: 43 bits 68 * 69 * Of course, this means for 32-bit spaces we always have a (practically) 70 * wasted page for the segmap (only one entry used) and half a page wasted 71 * for the page directory. We still have need of one extra bit 8^(. 72 */ 73 74 #define HOLESHIFT (43) 75 76 #define PTSZ (NBPG/8) 77 #define PDSZ (PTSZ) 78 #define STSZ (PTSZ) 79 80 #define PTSHIFT (13) 81 #define PDSHIFT (10+PTSHIFT) 82 #define STSHIFT (10+PDSHIFT) 83 84 #define PTMASK (PTSZ-1) 85 #define PDMASK (PDSZ-1) 86 #define STMASK (STSZ-1) 87 88 #ifndef _LOCORE 89 90 /* 91 * Support for big page sizes. This maps the page size to the 92 * page bits. 93 */ 94 struct page_size_map { 95 u_int64_t mask; 96 u_int64_t code; 97 #ifdef DEBUG 98 u_int64_t use; 99 #endif 100 }; 101 extern struct page_size_map page_size_map[]; 102 103 /* 104 * Pmap stuff 105 */ 106 107 #define va_to_seg(v) (int)((((paddr_t)(v))>>STSHIFT)&STMASK) 108 #define va_to_dir(v) (int)((((paddr_t)(v))>>PDSHIFT)&PDMASK) 109 #define va_to_pte(v) (int)((((paddr_t)(v))>>PTSHIFT)&PTMASK) 110 111 struct pmap { 112 struct uvm_object pm_obj; 113 #define pm_lock pm_obj.vmobjlock 114 #define pm_refs pm_obj.uo_refs 115 LIST_ENTRY(pmap) pm_list; 116 int pm_ctx; /* Current context */ 117 118 /* 119 * This contains 64-bit pointers to pages that contain 120 * 1024 64-bit pointers to page tables. All addresses 121 * are physical. 122 * 123 * !!! Only touch this through pseg_get() and pseg_set() !!! 124 */ 125 paddr_t pm_physaddr; /* physical address of pm_segs */ 126 int64_t *pm_segs; 127 }; 128 129 /* 130 * This comes from the PROM and is used to map prom entries. 131 */ 132 struct prom_map { 133 u_int64_t vstart; 134 u_int64_t vsize; 135 u_int64_t tte; 136 }; 137 138 #define PMAP_NC 0x001 /* Set the E bit in the page */ 139 #define PMAP_NVC 0x002 /* Don't enable the virtual cache */ 140 #define PMAP_LITTLE 0x004 /* Map in little endian mode */ 141 /* Large page size hints -- 142 we really should use another param to pmap_enter() */ 143 #define PMAP_8K 0x000 144 #define PMAP_64K 0x008 /* Use 64K page */ 145 #define PMAP_512K 0x010 146 #define PMAP_4M 0x018 147 #define PMAP_SZ_TO_TTE(x) (((x)&0x018)<<58) 148 /* If these bits are different in va's to the same PA 149 then there is an aliasing in the d$ */ 150 #define VA_ALIAS_MASK (1 << 14) 151 152 typedef struct pmap *pmap_t; 153 154 #ifdef _KERNEL 155 extern struct pmap kernel_pmap_; 156 #define pmap_kernel() (&kernel_pmap_) 157 158 int pmap_count_res __P((struct pmap *)); 159 int pmap_count_wired __P((struct pmap *)); 160 #define pmap_resident_count(pm) pmap_count_res((pm)) 161 #define pmap_wired_count(pm) pmap_count_wired((pm)) 162 #define pmap_phys_address(x) (x) 163 164 void pmap_activate_pmap(struct pmap *); 165 166 static __inline void 167 pmap_update(struct pmap *pmap) 168 { 169 170 if (pmap->pm_refs > 0) { 171 return; 172 } 173 pmap->pm_refs = 1; 174 pmap_activate_pmap(pmap); 175 } 176 177 void pmap_bootstrap __P((u_long kernelstart, u_long kernelend, u_int numctx)); 178 /* make sure all page mappings are modulo 16K to prevent d$ aliasing */ 179 #define PMAP_PREFER(pa, va) (*(va)+=(((*(va))^(pa))&(1<<(PGSHIFT)))) 180 181 #define PMAP_GROWKERNEL /* turn on pmap_growkernel interface */ 182 #define PMAP_NEED_PROCWR 183 #define __HAVE_PMAP_PREDESTROY 184 #define __HAVE_PMAP_ACTIVATE_KERNEL 185 186 void pmap_procwr(struct proc *, vaddr_t, size_t); 187 188 /* SPARC specific? */ 189 int pmap_dumpsize __P((void)); 190 int pmap_dumpmmu __P((int (*)__P((dev_t, daddr_t, caddr_t, size_t)), 191 daddr_t)); 192 int pmap_pa_exists __P((paddr_t)); 193 struct proc; 194 void switchexit __P((struct proc *)); 195 196 /* SPARC64 specific */ 197 int ctx_alloc __P((struct pmap *)); 198 void ctx_free __P((struct pmap *)); 199 200 #endif /* _KERNEL */ 201 202 #endif /* _LOCORE */ 203 #endif /* _MACHINE_PMAP_H_ */ 204
Indexes created Sun Sep 28 16:09:52 GMT 2025