1 /* $NetBSD: pmap.h,v 1.22 2002/04/16 23:11:20 eeh 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 #endif 41 42 /* 43 * This scheme uses 2-level page tables. 44 * 45 * While we're still in 32-bit mode we do the following: 46 * 47 * offset: 13 bits 48 * 1st level: 1024 64-bit TTEs in an 8K page for 10 bits 49 * 2nd level: 512 32-bit pointers in the pmap for 9 bits 50 * ------- 51 * total: 32 bits 52 * 53 * In 64-bit mode the Spitfire and Blackbird CPUs support only 54 * 44-bit virtual addresses. All addresses between 55 * 0x0000 07ff ffff ffff and 0xffff f800 0000 0000 are in the 56 * "VA hole" and trap, so we don't have to track them. However, 57 * we do need to keep them in mind during PT walking. If they 58 * ever change the size of the address "hole" we need to rework 59 * all the page table handling. 60 * 61 * offset: 13 bits 62 * 1st level: 1024 64-bit TTEs in an 8K page for 10 bits 63 * 2nd level: 1024 64-bit pointers in an 8K page for 10 bits 64 * 3rd level: 1024 64-bit pointers in the segmap for 10 bits 65 * ------- 66 * total: 43 bits 67 * 68 * Of course, this means for 32-bit spaces we always have a (practically) 69 * wasted page for the segmap (only one entry used) and half a page wasted 70 * for the page directory. We still have need of one extra bit 8^(. 71 */ 72 73 #define HOLESHIFT (43) 74 75 #define PTSZ (NBPG/8) 76 #define PDSZ (PTSZ) 77 #define STSZ (PTSZ) 78 79 #define PTSHIFT (13) 80 #define PDSHIFT (10+PTSHIFT) 81 #define STSHIFT (10+PDSHIFT) 82 83 #define PTMASK (PTSZ-1) 84 #define PDMASK (PDSZ-1) 85 #define STMASK (STSZ-1) 86 87 #ifndef _LOCORE 88 89 /* 90 * Support for big page sizes. This maps the page size to the 91 * page bits. 92 */ 93 struct page_size_map { 94 u_int64_t mask; 95 u_int64_t code; 96 #ifdef DEBUG 97 u_int64_t use; 98 #endif 99 }; 100 extern struct page_size_map page_size_map[]; 101 102 /* 103 * Pmap stuff 104 */ 105 106 #define va_to_seg(v) (int)((((paddr_t)(v))>>STSHIFT)&STMASK) 107 #define va_to_dir(v) (int)((((paddr_t)(v))>>PDSHIFT)&PDMASK) 108 #define va_to_pte(v) (int)((((paddr_t)(v))>>PTSHIFT)&PTMASK) 109 110 struct pmap { 111 int pm_ctx; /* Current context */ 112 int pm_refs; /* ref count */ 113 /* 114 * This contains 64-bit pointers to pages that contain 115 * 1024 64-bit pointers to page tables. All addresses 116 * are physical. 117 * 118 * !!! Only touch this through pseg_get() and pseg_set() !!! 119 */ 120 paddr_t pm_physaddr; /* physical address of pm_segs */ 121 int64_t *pm_segs; 122 struct simplelock pm_lock; 123 }; 124 125 /* 126 * This comes from the PROM and is used to map prom entries. 127 */ 128 struct prom_map { 129 u_int64_t vstart; 130 u_int64_t vsize; 131 u_int64_t tte; 132 }; 133 134 #define PMAP_NC 0x001 /* Set the E bit in the page */ 135 #define PMAP_NVC 0x002 /* Don't enable the virtual cache */ 136 #define PMAP_LITTLE 0x004 /* Map in little endian mode */ 137 /* Large page size hints -- we really should use another param to pmap_enter() */ 138 #define PMAP_8K 0x000 139 #define PMAP_64K 0x008 /* Use 64K page */ 140 #define PMAP_512K 0x010 141 #define PMAP_4M 0x018 142 #define PMAP_SZ_TO_TTE(x) (((x)&0x018)<<58) 143 /* If these bits are different in va's to the same PA then there is an aliasing in the d$ */ 144 #define VA_ALIAS_MASK (1<<14) 145 146 typedef struct pmap *pmap_t; 147 148 /* 149 * Encode IO space for pmap_enter() 150 * 151 * Since sun4u machines don't have separate IO spaces, this is a noop. 152 */ 153 #define PMAP_IOENC(io) 0 154 155 #ifdef _KERNEL 156 extern struct pmap kernel_pmap_; 157 #define pmap_kernel() (&kernel_pmap_) 158 159 int pmap_count_res __P((pmap_t pmap)); 160 int pmap_count_wired __P((pmap_t pmap)); 161 #define pmap_resident_count(pm) pmap_count_res((pm)) 162 #define pmap_wired_count(pm) pmap_count_wired((pm)) 163 #define pmap_from_phys_address(x,f) ((x)&~PGOFSET) 164 #define pmap_phys_address(x) (x) 165 #define pmap_update(pmap) /* nothing (yet) */ 166 167 void pmap_bootstrap __P((u_long kernelstart, u_long kernelend, u_int numctx)); 168 /* make sure all page mappings are modulo 16K to prevent d$ aliasing */ 169 #define PMAP_PREFER(pa, va) (*(va)+=(((*(va))^(pa))&(1<<(PGSHIFT)))) 170 171 #define PMAP_GROWKERNEL /* turn on pmap_growkernel interface */ 172 173 /* SPARC specific? */ 174 void pmap_redzone __P((void)); 175 int pmap_dumpsize __P((void)); 176 int pmap_dumpmmu __P((int (*)__P((dev_t, daddr_t, caddr_t, size_t)), 177 daddr_t)); 178 int pmap_pa_exists __P((paddr_t)); 179 struct proc; 180 void switchexit __P((struct proc *)); 181 182 /* SPARC64 specific */ 183 int ctx_alloc __P((struct pmap*)); 184 void ctx_free __P((struct pmap*)); 185 186 187 #endif /* _KERNEL */ 188 189 /* This is only for compatibility with the SPARC */ 190 struct segmap { 191 int *sg_pte; /* points to NPTESG PTEs */ 192 pmeg_t sg_pmeg; /* the MMU segment number (4c) */ 193 u_char sg_npte; /* number of valid PTEs per seg */ 194 }; 195 196 #endif /* _LOCORE */ 197 #endif /* _MACHINE_PMAP_H_ */ 198