1 /* $NetBSD: segments.h,v 1.4 2004/02/13 11:36:20 wiz Exp $ */ 2 3 /*- 4 * Copyright (c) 1990 The Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 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 * @(#)segments.h 7.1 (Berkeley) 5/9/91 35 */ 36 37 /*- 38 * Copyright (c) 1995, 1997 39 * Charles M. Hannum. All rights reserved. 40 * Copyright (c) 1989, 1990 William F. Jolitz 41 * 42 * This code is derived from software contributed to Berkeley by 43 * William Jolitz. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. All advertising materials mentioning features or use of this software 54 * must display the following acknowledgement: 55 * This product includes software developed by the University of 56 * California, Berkeley and its contributors. 57 * 4. Neither the name of the University nor the names of its contributors 58 * may be used to endorse or promote products derived from this software 59 * without specific prior written permission. 60 * 61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 64 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 71 * SUCH DAMAGE. 72 * 73 * @(#)segments.h 7.1 (Berkeley) 5/9/91 74 */ 75 76 /* 77 * Adapted for NetBSD/amd64 by fvdl@wasabisystems.com. 78 */ 79 80 /* 81 * 386 Segmentation Data Structures and definitions 82 * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989 83 */ 84 85 #ifndef _AMD64_SEGMENTS_H_ 86 #define _AMD64_SEGMENTS_H_ 87 88 /* 89 * Selectors 90 */ 91 92 #define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */ 93 #define SEL_KPL 0 /* kernel privilege level */ 94 #define SEL_UPL 3 /* user privilege level */ 95 #define SEL_RPL 3 /* requester's privilege level mask */ 96 #define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */ 97 #define SEL_LDT 4 /* local descriptor table */ 98 99 /* Dynamically allocated TSSs and LDTs start (byte offset) */ 100 #define SYSSEL_START (NGDT_MEM << 3) 101 #define DYNSEL_START (SYSSEL_START + (NGDT_SYS << 4)) 102 103 /* 104 * These define the index not from the start of the GDT, but from 105 * the part of the GDT that they're allocated from. 106 * First NGDT_MEM entries are 8-byte descriptors for CS and DS. 107 * Next NGDT_SYS entries are 16-byte descriptors defining LDTs. 108 * 109 * The rest is 16-byte descriptors for TSS and LDT. 110 */ 111 112 #define IDXSEL(s) (((s) >> 3) & 0x1fff) 113 #define IDXDYNSEL(s) ((((s) & ~SEL_RPL) - DYNSEL_START) >> 4) 114 115 #define GSEL(s,r) (((s) << 3) | r) 116 #define GSYSSEL(s,r) ((((s) << 4) + SYSSEL_START) | r) 117 #define GDYNSEL(s,r) ((((s) << 4) + DYNSEL_START) | r | SEL_KPL) 118 119 #define LSEL(s,r) ((s) | r | SEL_LDT) 120 121 #define USERMODE(c, f) (ISPL(c) == SEL_UPL) 122 #define KERNELMODE(c, f) (ISPL(c) == SEL_KPL) 123 124 #ifndef _LOCORE 125 126 /* 127 * Memory and System segment descriptors 128 */ 129 130 /* 131 * Below is used for TSS and LDT. 132 */ 133 struct sys_segment_descriptor { 134 /*BITFIELDTYPE*/ u_int64_t sd_lolimit:16;/* segment extent (lsb) */ 135 /*BITFIELDTYPE*/ u_int64_t sd_lobase:24;/* segment base address (lsb) */ 136 /*BITFIELDTYPE*/ u_int64_t sd_type:5; /* segment type */ 137 /*BITFIELDTYPE*/ u_int64_t sd_dpl:2; /* segment descriptor priority level */ 138 /*BITFIELDTYPE*/ u_int64_t sd_p:1; /* segment descriptor present */ 139 /*BITFIELDTYPE*/ u_int64_t sd_hilimit:4;/* segment extent (msb) */ 140 /*BITFIELDTYPE*/ u_int64_t sd_xx1:3; /* avl, long and def32 (not used) */ 141 /*BITFIELDTYPE*/ u_int64_t sd_gran:1; /* limit granularity (byte/page) */ 142 /*BITFIELDTYPE*/ u_int64_t sd_hibase:40;/* segment base address (msb) */ 143 /*BITFIELDTYPE*/ u_int64_t sd_xx2:8; /* reserved */ 144 /*BITFIELDTYPE*/ u_int64_t sd_zero:5; /* must be zero */ 145 /*BITFIELDTYPE*/ u_int64_t sd_xx3:19; /* reserved */ 146 } __attribute__((packed)); 147 148 /* 149 * Below is used for cs, ds, etc. 150 */ 151 struct mem_segment_descriptor { 152 unsigned sd_lolimit:16; /* segment extent (lsb) */ 153 unsigned sd_lobase:24; /* segment base address (lsb) */ 154 unsigned sd_type:5; /* segment type */ 155 unsigned sd_dpl:2; /* segment descriptor priority level */ 156 unsigned sd_p:1; /* segment descriptor present */ 157 unsigned sd_hilimit:4; /* segment extent (msb) */ 158 unsigned sd_avl:1; /* available */ 159 unsigned sd_long:1; /* long mode */ 160 unsigned sd_def32:1; /* default 32 vs 16 bit size */ 161 unsigned sd_gran:1; /* limit granularity (byte/page) */ 162 unsigned sd_hibase:8; /* segment base address (msb) */ 163 } __attribute__((packed)); 164 165 /* 166 * Gate descriptors (e.g. indirect descriptors) 167 */ 168 struct gate_descriptor { 169 /*BITFIELDTYPE*/ u_int64_t gd_looffset:16;/* gate offset (lsb) */ 170 /*BITFIELDTYPE*/ u_int64_t gd_selector:16;/* gate segment selector */ 171 /*BITFIELDTYPE*/ u_int64_t gd_ist:3; /* IST select */ 172 /*BITFIELDTYPE*/ u_int64_t gd_xx1:5; /* reserved */ 173 /*BITFIELDTYPE*/ u_int64_t gd_type:5; /* segment type */ 174 /*BITFIELDTYPE*/ u_int64_t gd_dpl:2; /* segment descriptor priority level */ 175 /*BITFIELDTYPE*/ u_int64_t gd_p:1; /* segment descriptor present */ 176 /*BITFIELDTYPE*/ u_int64_t gd_hioffset:48;/* gate offset (msb) */ 177 /*BITFIELDTYPE*/ u_int64_t gd_xx2:8; /* reserved */ 178 /*BITFIELDTYPE*/ u_int64_t gd_zero:5; /* must be zero */ 179 /*BITFIELDTYPE*/ u_int64_t gd_xx3:19; /* reserved */ 180 } __attribute__((packed)); 181 182 /* 183 * region descriptors, used to load gdt/idt tables before segments yet exist. 184 */ 185 struct region_descriptor { 186 u_int16_t rd_limit; /* segment extent */ 187 u_int64_t rd_base; /* base address */ 188 } __attribute__((packed)); 189 190 #ifdef _KERNEL 191 #if 0 192 extern struct sys_segment_descriptor *ldt; 193 #endif 194 extern struct gate_descriptor *idt; 195 extern char *gdtstore; 196 extern char *ldtstore; 197 198 void setgate __P((struct gate_descriptor *, void *, int, int, int, int)); 199 void unsetgate __P((struct gate_descriptor *)); 200 void setregion __P((struct region_descriptor *, void *, u_int16_t)); 201 void set_sys_segment __P((struct sys_segment_descriptor *, void *, size_t, 202 int, int, int)); 203 void set_mem_segment __P((struct mem_segment_descriptor *, void *, size_t, 204 int, int, int, int, int)); 205 int idt_vec_alloc __P((int, int)); 206 void idt_vec_set __P((int, void (*)(void))); 207 void idt_vec_free __P((int)); 208 void cpu_init_idt __P((void)); 209 210 #endif /* _KERNEL */ 211 212 #endif /* !_LOCORE */ 213 214 /* system segments and gate types */ 215 #define SDT_SYSNULL 0 /* system null */ 216 #define SDT_SYS286TSS 1 /* system 286 TSS available */ 217 #define SDT_SYSLDT 2 /* system local descriptor table */ 218 #define SDT_SYS286BSY 3 /* system 286 TSS busy */ 219 #define SDT_SYS286CGT 4 /* system 286 call gate */ 220 #define SDT_SYSTASKGT 5 /* system task gate */ 221 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 222 #define SDT_SYS286TGT 7 /* system 286 trap gate */ 223 #define SDT_SYSNULL2 8 /* system null again */ 224 #define SDT_SYS386TSS 9 /* system 386 TSS available */ 225 #define SDT_SYSNULL3 10 /* system null again */ 226 #define SDT_SYS386BSY 11 /* system 386 TSS busy */ 227 #define SDT_SYS386CGT 12 /* system 386 call gate */ 228 #define SDT_SYSNULL4 13 /* system null again */ 229 #define SDT_SYS386IGT 14 /* system 386 interrupt gate */ 230 #define SDT_SYS386TGT 15 /* system 386 trap gate */ 231 232 /* memory segment types */ 233 #define SDT_MEMRO 16 /* memory read only */ 234 #define SDT_MEMROA 17 /* memory read only accessed */ 235 #define SDT_MEMRW 18 /* memory read write */ 236 #define SDT_MEMRWA 19 /* memory read write accessed */ 237 #define SDT_MEMROD 20 /* memory read only expand dwn limit */ 238 #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ 239 #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ 240 #define SDT_MEMRWDA 23 /* memory read write expand dwn limit acessed */ 241 #define SDT_MEME 24 /* memory execute only */ 242 #define SDT_MEMEA 25 /* memory execute only accessed */ 243 #define SDT_MEMER 26 /* memory execute read */ 244 #define SDT_MEMERA 27 /* memory execute read accessed */ 245 #define SDT_MEMEC 28 /* memory execute only conforming */ 246 #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ 247 #define SDT_MEMERC 30 /* memory execute read conforming */ 248 #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ 249 250 /* is memory segment descriptor pointer ? */ 251 #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && \ 252 (s->d_type) <= SDT_MEMERAC) 253 254 /* is 286 gate descriptor pointer ? */ 255 #define IS286GDP(s) ((s->d_type) >= SDT_SYS286CGT && \ 256 (s->d_type) < SDT_SYS286TGT) 257 258 /* is 386 gate descriptor pointer ? */ 259 #define IS386GDP(s) ((s->d_type) >= SDT_SYS386CGT && \ 260 (s->d_type) < SDT_SYS386TGT) 261 262 /* is gate descriptor pointer ? */ 263 #define ISGDP(s) (IS286GDP(s) || IS386GDP(s)) 264 265 /* is segment descriptor pointer ? */ 266 #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s)) 267 268 /* is system segment descriptor pointer ? */ 269 #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s)) 270 271 /* 272 * Segment Protection Exception code bits 273 */ 274 #define SEGEX_EXT 0x01 /* recursive or externally induced */ 275 #define SEGEX_IDT 0x02 /* interrupt descriptor table */ 276 #define SEGEX_TI 0x04 /* local descriptor table */ 277 278 /* 279 * Entries in the Interrupt Descriptor Table (IDT) 280 */ 281 #define NIDT 256 282 #define NRSVIDT 32 /* reserved entries for CPU exceptions */ 283 284 /* 285 * Entries in the Global Descriptor Table (GDT) 286 * The code and data descriptors must come first. There 287 * are NGDT_MEM of them. 288 * 289 * Then come the predefined LDT (and possibly TSS) descriptors. 290 * There are NGDT_SYS of them. 291 */ 292 #define GNULL_SEL 0 /* Null descriptor */ 293 #define GCODE_SEL 1 /* Kernel code descriptor */ 294 #define GDATA_SEL 2 /* Kernel data descriptor */ 295 #define GUCODE_SEL 3 /* User code descriptor */ 296 #define GUDATA_SEL 4 /* User data descriptor */ 297 #define GAPM32CODE_SEL 5 298 #define GAPM16CODE_SEL 6 299 #define GAPMDATA_SEL 7 300 #define GBIOSCODE_SEL 8 301 #define GBIOSDATA_SEL 9 302 #define GPNPBIOSCODE_SEL 10 303 #define GPNPBIOSDATA_SEL 11 304 #define GPNPBIOSSCRATCH_SEL 12 305 #define GPNPBIOSTRAMP_SEL 13 306 #define GUCODE32_SEL 14 307 #define GUDATA32_SEL 15 308 #define NGDT_MEM 16 309 310 #define GLDT_SEL 0 /* Default LDT descriptor */ 311 #define NGDT_SYS 1 312 313 #define GDT_SYS_OFFSET (NGDT_MEM << 3) 314 315 #define GDT_ADDR_MEM(s,i) \ 316 ((struct mem_segment_descriptor *)((s) + ((i) << 3))) 317 #define GDT_ADDR_SYS(s,i) \ 318 ((struct sys_segment_descriptor *)((s) + (((i) << 4) + SYSSEL_START))) 319 320 /* 321 * Byte offsets in the Local Descriptor Table (LDT) 322 * Strange order because of syscall/sysret insns 323 */ 324 #define LSYS5CALLS_SEL 0 /* iBCS system call gate */ 325 #define LUCODE32_SEL 8 /* 32 bit user code descriptor */ 326 #define LUDATA_SEL 16 /* User data descriptor */ 327 #define LUCODE_SEL 24 /* User code descriptor */ 328 #define LSOL26CALLS_SEL 32 /* Solaris 2.6 system call gate */ 329 #define LUDATA32_SEL 56 /* 32 bit user data descriptor (needed?)*/ 330 #define LBSDICALLS_SEL 128 /* BSDI system call gate */ 331 332 #define LDT_SIZE 144 333 334 #define LSYSRETBASE_SEL LUCODE32_SEL 335 336 /* 337 * Checks for valid user selectors. If USER_LDT ever gets implemented 338 * for amd64, these must check the ldt length and SEL_UPL if a user 339 * ldt is active. 340 */ 341 #define VALID_USER_DSEL32(s) \ 342 ((s) == GSEL(GUDATA32_SEL, SEL_UPL) || (s) == LSEL(LUDATA32_SEL, SEL_UPL)) 343 #define VALID_USER_CSEL32(s) \ 344 ((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL)) 345 346 #define VALID_USER_CSEL(s) \ 347 ((s) == GSEL(GUCODE_SEL, SEL_UPL) || (s) == LSEL(LUCODE_SEL, SEL_UPL)) 348 #define VALID_USER_DSEL(s) \ 349 ((s) == GSEL(GUDATA_SEL, SEL_UPL) || (s) == LSEL(LUDATA_SEL, SEL_UPL)) 350 351 #endif /* _AMD64_SEGMENTS_H_ */ 352