segments.h revision 1.18
1 /* $NetBSD: segments.h,v 1.18 2008/04/19 12:10:08 cegger 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 (at) wasabisystems.com. 78 */ 79 80 /* 81 * 386 Segmentation Data Structures and definitions 82 * William F. Jolitz (william (at) ernie.berkeley.edu) 6/20/1989 83 */ 84 85 #ifndef _AMD64_SEGMENTS_H_ 86 #define _AMD64_SEGMENTS_H_ 87 #ifdef _KERNEL_OPT 88 #include "opt_xen.h" 89 #endif 90 91 /* 92 * Selectors 93 */ 94 95 #define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */ 96 #ifdef XEN 97 #define SEL_KPL 3 /* kernel privilege level */ 98 #define SEL_XPL 0 /* Xen Hypervisor privilege level */ 99 #else 100 #define SEL_KPL 0 /* kernel privilege level */ 101 #endif 102 #define SEL_UPL 3 /* user privilege level */ 103 #define SEL_RPL 3 /* requester's privilege level mask */ 104 #define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */ 105 #define SEL_LDT 4 /* local descriptor table */ 106 107 /* Dynamically allocated TSSs and LDTs start (byte offset) */ 108 #define SYSSEL_START (NGDT_MEM << 3) 109 #define DYNSEL_START (SYSSEL_START + (NGDT_SYS << 4)) 110 111 /* 112 * These define the index not from the start of the GDT, but from 113 * the part of the GDT that they're allocated from. 114 * First NGDT_MEM entries are 8-byte descriptors for CS and DS. 115 * Next NGDT_SYS entries are 16-byte descriptors defining LDTs. 116 * 117 * The rest is 16-byte descriptors for TSS and LDT. 118 */ 119 120 #define IDXSEL(s) (((s) >> 3) & 0x1fff) 121 #define IDXDYNSEL(s) ((((s) & ~SEL_RPL) - DYNSEL_START) >> 4) 122 123 #define GSEL(s,r) (((s) << 3) | r) 124 #define GSYSSEL(s,r) ((((s) << 4) + SYSSEL_START) | r) 125 #define GDYNSEL(s,r) ((((s) << 4) + DYNSEL_START) | r | SEL_KPL) 126 127 #define LSEL(s,r) ((s) | r | SEL_LDT) 128 129 #define USERMODE(c, f) (ISPL(c) == SEL_UPL) 130 #ifdef XEN 131 /* 132 * As KPL == UPL, Xen emulate interrupt in kernel context by pushing 133 * a fake CS with XPL privilege 134 */ 135 #define KERNELMODE(c, f) (ISPL(c) == SEL_XPL) 136 #else 137 #define KERNELMODE(c, f) (ISPL(c) == SEL_KPL) 138 #endif 139 140 #ifndef _LOCORE 141 142 /* 143 * Memory and System segment descriptors 144 */ 145 146 /* 147 * Below is used for TSS and LDT. 148 */ 149 struct sys_segment_descriptor { 150 /*BITFIELDTYPE*/ uint64_t sd_lolimit:16;/* segment extent (lsb) */ 151 /*BITFIELDTYPE*/ uint64_t sd_lobase:24;/* segment base address (lsb) */ 152 /*BITFIELDTYPE*/ uint64_t sd_type:5; /* segment type */ 153 /*BITFIELDTYPE*/ uint64_t sd_dpl:2; /* segment descriptor priority level */ 154 /*BITFIELDTYPE*/ uint64_t sd_p:1; /* segment descriptor present */ 155 /*BITFIELDTYPE*/ uint64_t sd_hilimit:4;/* segment extent (msb) */ 156 /*BITFIELDTYPE*/ uint64_t sd_xx1:3; /* avl, long and def32 (not used) */ 157 /*BITFIELDTYPE*/ uint64_t sd_gran:1; /* limit granularity (byte/page) */ 158 /*BITFIELDTYPE*/ uint64_t sd_hibase:40;/* segment base address (msb) */ 159 /*BITFIELDTYPE*/ uint64_t sd_xx2:8; /* reserved */ 160 /*BITFIELDTYPE*/ uint64_t sd_zero:5; /* must be zero */ 161 /*BITFIELDTYPE*/ uint64_t sd_xx3:19; /* reserved */ 162 } __packed; 163 164 /* 165 * Below is used for cs, ds, etc. 166 */ 167 struct mem_segment_descriptor { 168 unsigned sd_lolimit:16; /* segment extent (lsb) */ 169 unsigned sd_lobase:24; /* segment base address (lsb) */ 170 unsigned sd_type:5; /* segment type */ 171 unsigned sd_dpl:2; /* segment descriptor priority level */ 172 unsigned sd_p:1; /* segment descriptor present */ 173 unsigned sd_hilimit:4; /* segment extent (msb) */ 174 unsigned sd_avl:1; /* available */ 175 unsigned sd_long:1; /* long mode */ 176 unsigned sd_def32:1; /* default 32 vs 16 bit size */ 177 unsigned sd_gran:1; /* limit granularity (byte/page) */ 178 unsigned sd_hibase:8; /* segment base address (msb) */ 179 } __packed; 180 181 /* 182 * Common part of the above structures. Used to walk descriptor tables. 183 */ 184 struct common_segment_descriptor { 185 unsigned sdc_lolimit:16; 186 unsigned sdc_lobase:24; 187 unsigned sdc_type:5; 188 unsigned sdc_other:19; 189 } __packed; 190 191 /* 192 * Gate descriptors (e.g. indirect descriptors) 193 */ 194 struct gate_descriptor { 195 /*BITFIELDTYPE*/ uint64_t gd_looffset:16;/* gate offset (lsb) */ 196 /*BITFIELDTYPE*/ uint64_t gd_selector:16;/* gate segment selector */ 197 /*BITFIELDTYPE*/ uint64_t gd_ist:3; /* IST select */ 198 /*BITFIELDTYPE*/ uint64_t gd_xx1:5; /* reserved */ 199 /*BITFIELDTYPE*/ uint64_t gd_type:5; /* segment type */ 200 /*BITFIELDTYPE*/ uint64_t gd_dpl:2; /* segment descriptor priority level */ 201 /*BITFIELDTYPE*/ uint64_t gd_p:1; /* segment descriptor present */ 202 /*BITFIELDTYPE*/ uint64_t gd_hioffset:48;/* gate offset (msb) */ 203 /*BITFIELDTYPE*/ uint64_t gd_xx2:8; /* reserved */ 204 /*BITFIELDTYPE*/ uint64_t gd_zero:5; /* must be zero */ 205 /*BITFIELDTYPE*/ uint64_t gd_xx3:19; /* reserved */ 206 } __packed; 207 208 /* 209 * region descriptors, used to load gdt/idt tables before segments yet exist. 210 */ 211 struct region_descriptor { 212 uint16_t rd_limit; /* segment extent */ 213 uint64_t rd_base; /* base address */ 214 } __packed; 215 216 #ifdef _KERNEL 217 #if 0 218 extern struct sys_segment_descriptor *ldt; 219 #endif 220 #ifdef XEN 221 extern struct trap_info *idt; 222 #else 223 extern struct gate_descriptor *idt; 224 #endif 225 extern char *gdtstore; 226 extern char *ldtstore; 227 228 void setgate(struct gate_descriptor *, void *, int, int, int, int); 229 void unsetgate(struct gate_descriptor *); 230 void setregion(struct region_descriptor *, void *, uint16_t); 231 void set_sys_segment(struct sys_segment_descriptor *, void *, size_t, 232 int, int, int); 233 void set_mem_segment(struct mem_segment_descriptor *, void *, size_t, 234 int, int, int, int, int); 235 void cpu_init_idt(void); 236 237 #if !defined(XEN) 238 void idt_init(void); 239 void idt_vec_reserve(int); 240 int idt_vec_alloc(int, int); 241 void idt_vec_set(int, void (*)(void)); 242 void idt_vec_free(int); 243 #endif 244 245 struct lwp; 246 int memseg_baseaddr(struct lwp *, uint64_t, char *, int, uint64_t *); 247 int valid_user_selector(struct lwp *, uint64_t, char *, int); 248 249 250 #endif /* _KERNEL */ 251 252 #endif /* !_LOCORE */ 253 254 /* system segments and gate types */ 255 #define SDT_SYSNULL 0 /* system null */ 256 #define SDT_SYS286TSS 1 /* system 286 TSS available */ 257 #define SDT_SYSLDT 2 /* system local descriptor table */ 258 #define SDT_SYS286BSY 3 /* system 286 TSS busy */ 259 #define SDT_SYS286CGT 4 /* system 286 call gate */ 260 #define SDT_SYSTASKGT 5 /* system task gate */ 261 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 262 #define SDT_SYS286TGT 7 /* system 286 trap gate */ 263 #define SDT_SYSNULL2 8 /* system null again */ 264 #define SDT_SYS386TSS 9 /* system 386 TSS available */ 265 #define SDT_SYSNULL3 10 /* system null again */ 266 #define SDT_SYS386BSY 11 /* system 386 TSS busy */ 267 #define SDT_SYS386CGT 12 /* system 386 call gate */ 268 #define SDT_SYSNULL4 13 /* system null again */ 269 #define SDT_SYS386IGT 14 /* system 386 interrupt gate */ 270 #define SDT_SYS386TGT 15 /* system 386 trap gate */ 271 272 /* memory segment types */ 273 #define SDT_MEMRO 16 /* memory read only */ 274 #define SDT_MEMROA 17 /* memory read only accessed */ 275 #define SDT_MEMRW 18 /* memory read write */ 276 #define SDT_MEMRWA 19 /* memory read write accessed */ 277 #define SDT_MEMROD 20 /* memory read only expand dwn limit */ 278 #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ 279 #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ 280 #define SDT_MEMRWDA 23 /* memory read write expand dwn limit acessed */ 281 #define SDT_MEME 24 /* memory execute only */ 282 #define SDT_MEMEA 25 /* memory execute only accessed */ 283 #define SDT_MEMER 26 /* memory execute read */ 284 #define SDT_MEMERA 27 /* memory execute read accessed */ 285 #define SDT_MEMEC 28 /* memory execute only conforming */ 286 #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ 287 #define SDT_MEMERC 30 /* memory execute read conforming */ 288 #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ 289 290 /* is memory segment descriptor pointer ? */ 291 #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && \ 292 (s->d_type) <= SDT_MEMERAC) 293 294 /* is 286 gate descriptor pointer ? */ 295 #define IS286GDP(s) ((s->d_type) >= SDT_SYS286CGT && \ 296 (s->d_type) < SDT_SYS286TGT) 297 298 /* is 386 gate descriptor pointer ? */ 299 #define IS386GDP(s) ((s->d_type) >= SDT_SYS386CGT && \ 300 (s->d_type) < SDT_SYS386TGT) 301 302 /* is gate descriptor pointer ? */ 303 #define ISGDP(s) (IS286GDP(s) || IS386GDP(s)) 304 305 /* is segment descriptor pointer ? */ 306 #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s)) 307 308 /* is system segment descriptor pointer ? */ 309 #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s)) 310 311 /* 312 * Segment Protection Exception code bits 313 */ 314 #define SEGEX_EXT 0x01 /* recursive or externally induced */ 315 #define SEGEX_IDT 0x02 /* interrupt descriptor table */ 316 #define SEGEX_TI 0x04 /* local descriptor table */ 317 318 /* 319 * Entries in the Interrupt Descriptor Table (IDT) 320 */ 321 #define NIDT 256 322 #define NRSVIDT 32 /* reserved entries for CPU exceptions */ 323 324 /* 325 * Entries in the Global Descriptor Table (GDT) 326 * The code and data descriptors must come first. There 327 * are NGDT_MEM of them. 328 * 329 * Then come the predefined LDT (and possibly TSS) descriptors. 330 * There are NGDT_SYS of them. 331 */ 332 #define GNULL_SEL 0 /* Null descriptor */ 333 #define GCODE_SEL 1 /* Kernel code descriptor */ 334 #define GDATA_SEL 2 /* Kernel data descriptor */ 335 #define GUCODE_SEL 3 /* User code descriptor */ 336 #define GUDATA_SEL 4 /* User data descriptor */ 337 #define GAPM32CODE_SEL 5 338 #define GAPM16CODE_SEL 6 339 #define GAPMDATA_SEL 7 340 #define GBIOSCODE_SEL 8 341 #define GBIOSDATA_SEL 9 342 #define GPNPBIOSCODE_SEL 10 343 #define GPNPBIOSDATA_SEL 11 344 #define GPNPBIOSSCRATCH_SEL 12 345 #define GPNPBIOSTRAMP_SEL 13 346 #define GUCODE32_SEL 14 347 #define GUDATA32_SEL 15 348 #define NGDT_MEM 16 349 350 #define GLDT_SEL 0 /* Default LDT descriptor */ 351 #define NGDT_SYS 1 352 353 #define GDT_ADDR_MEM(s,i) \ 354 ((struct mem_segment_descriptor *)((s) + ((i) << 3))) 355 #define GDT_ADDR_SYS(s,i) \ 356 ((struct sys_segment_descriptor *)((s) + (((i) << 4) + SYSSEL_START))) 357 358 /* 359 * Byte offsets in the Local Descriptor Table (LDT) 360 * Strange order because of syscall/sysret insns 361 */ 362 #define LSYS5CALLS_SEL 0 /* iBCS system call gate */ 363 #define LUCODE32_SEL 8 /* 32 bit user code descriptor */ 364 #define LUDATA_SEL 16 /* User data descriptor */ 365 #define LUCODE_SEL 24 /* User code descriptor */ 366 #define LSOL26CALLS_SEL 32 /* Solaris 2.6 system call gate */ 367 #define LUDATA32_SEL 56 /* 32 bit user data descriptor (needed?)*/ 368 #define LBSDICALLS_SEL 128 /* BSDI system call gate */ 369 370 #define LDT_SIZE 144 371 372 #define LSYSRETBASE_SEL LUCODE32_SEL 373 374 /* 375 * Checks for valid user selectors. If USER_LDT ever gets implemented 376 * for amd64, these must check the ldt length and SEL_UPL if a user 377 * ldt is active. 378 */ 379 #define VALID_USER_DSEL32(s) \ 380 (((s) & 0xffff) == GSEL(GUDATA32_SEL, SEL_UPL) || \ 381 ((s) & 0xffff) == LSEL(LUDATA32_SEL, SEL_UPL)) 382 #if 0 /* not used */ 383 #define VALID_USER_CSEL32(s) \ 384 ((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL)) 385 #endif 386 387 #define VALID_USER_CSEL(s) \ 388 ((s) == GSEL(GUCODE_SEL, SEL_UPL) || (s) == LSEL(LUCODE_SEL, SEL_UPL)) 389 #define VALID_USER_DSEL(s) \ 390 ((s) == GSEL(GUDATA_SEL, SEL_UPL) || (s) == LSEL(LUDATA_SEL, SEL_UPL)) 391 392 #endif /* _AMD64_SEGMENTS_H_ */ 393
Indexes created Fri Sep 26 08:10:20 GMT 2025