1 /* 2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #ifndef _SYS_SEGMENTS_H 7 #define _SYS_SEGMENTS_H 8 9 #ifdef __cplusplus 10 extern "C" { 11 #endif 12 13 /* 14 * Copyright (c) 1989, 1990 William F. Jolitz 15 * Copyright (c) 1990 The Regents of the University of California. 16 * All rights reserved. 17 * 18 * This code is derived from software contributed to Berkeley by 19 * William Jolitz. 20 * 21 * Redistribution and use in source and binary forms, with or without 22 * modification, are permitted provided that the following conditions 23 * are met: 24 * 1. Redistributions of source code must retain the above copyright 25 * notice, this list of conditions and the following disclaimer. 26 * 2. Redistributions in binary form must reproduce the above copyright 27 * notice, this list of conditions and the following disclaimer in the 28 * documentation and/or other materials provided with the distribution. 29 * 3. All advertising materials mentioning features or use of this software 30 * must display the following acknowledgement: 31 * This product includes software developed by the University of 32 * California, Berkeley and its contributors. 33 * 4. Neither the name of the University nor the names of its contributors 34 * may be used to endorse or promote products derived from this software 35 * without specific prior written permission. 36 * 37 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 38 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 40 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 41 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 42 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 43 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 45 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 46 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 47 * SUCH DAMAGE. 48 * 49 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 50 * $FreeBSD: src/sys/i386/include/segments.h,v 1.34 2003/09/10 01:07:04 51 * jhb Exp $ 52 * 53 * 386 Segmentation Data Structures and definitions 54 * William F. Jolitz (william (at) ernie.berkeley.edu) 6/20/1989 55 */ 56 57 #include <sys/tss.h> 58 59 /* 60 * Selector register format 61 * CS, DS, ES, FS, GS, SS 62 * 63 * 15 3 2 1 0 64 * +---------------------+---+----+ 65 * | SI |TI |RPL | 66 * +---------------------+---+----+ 67 * 68 * SI = selector index 69 * TI = table indicator (0 = GDT, 1 = LDT) 70 * RPL = requestor privilege level 71 */ 72 #if !defined(_ASM) || defined(__GNUC_AS__) 73 #define IDXTOSEL(s) ((s) << 3) /* index to selector */ 74 #define SEL_GDT(s, r) (IDXTOSEL(s) | r) /* global sel */ 75 #else 76 #define IDXTOSEL(s) [s << 3] 77 #define SEL_GDT(s, r) [IDXTOSEL(s) | r] 78 #endif 79 80 #define SELTOIDX(s) ((s) >> 3) /* selector to index */ 81 82 /* 83 * SEL_(KPL,UPL,XPL) is the RPL or DPL value for code and data selectors 84 * and their descriptors respectively. 85 * 86 * TRP_(KPL,UPL,XPL) is used to indicate the DPL for system gates only. 87 * 88 * This distinction is important to support para-virt guests on the 89 * 64-bit hypervisor. Both guest kernel and user run in ring 3 and the 90 * hypervisor runs in ring 0. When the kernel creates its trap and 91 * interrupt gates it needs a way to prevent any arbitrary int $n 92 * instruction from entering a gate that is not expected. The hypervisor 93 * allows these gates to have a DPL from 1 to 3. By creating gates 94 * with a DPL below user (ring 3) the int $n will generate a #gp fault 95 * which the hypervisor catches and forwards to the guest. 96 */ 97 #if defined(__xpv) 98 99 #if defined(__amd64) 100 101 #define SEL_XPL 0 /* hypervisor privilege level */ 102 #define SEL_KPL 3 /* both kernel and user in ring 3 */ 103 #define TRP_KPL 1 /* system gate priv (user blocked) */ 104 105 #elif defined(__i386) 106 107 #define SEL_XPL 0 /* hypervisor privilege level */ 108 #define SEL_KPL 1 /* kernel privilege level */ 109 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */ 110 111 #endif /* __i386 */ 112 113 #define TRP_XPL 0 /* system gate priv (hypervisor) */ 114 115 #else /* __xpv */ 116 117 #define SEL_KPL 0 /* kernel privilege level on metal */ 118 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */ 119 120 #endif /* __xpv */ 121 122 #define SEL_UPL 3 /* user priority level */ 123 #define TRP_UPL 3 /* system gate priv (user allowed) */ 124 #define SEL_TI_LDT 4 /* local descriptor table */ 125 #define SEL_LDT(s) (IDXTOSEL(s) | SEL_TI_LDT | SEL_UPL) /* local sel */ 126 #define CPL_MASK 3 /* RPL mask for selector */ 127 #define SELISLDT(s) (((s) & SEL_TI_LDT) == SEL_TI_LDT) 128 #define SELISUPL(s) (((s) & CPL_MASK) == SEL_UPL) 129 130 #ifndef _ASM 131 132 typedef uint16_t selector_t; /* selector reigster */ 133 134 /* 135 * Hardware descriptor table register format for GDT and IDT. 136 */ 137 #if defined(__amd64) 138 139 #pragma pack(2) 140 typedef struct { 141 uint16_t dtr_limit; /* table limit */ 142 uint64_t dtr_base; /* table base address */ 143 } desctbr_t; 144 #pragma pack() 145 146 #elif defined(__i386) 147 148 #pragma pack(2) 149 typedef struct { 150 uint16_t dtr_limit; /* table limit */ 151 uint32_t dtr_base; /* table base address */ 152 } desctbr_t; 153 #pragma pack() 154 155 #endif /* __i386 */ 156 157 /* 158 * Functions for loading and storing descriptor table 159 * registers. 160 */ 161 extern void rd_idtr(desctbr_t *); 162 extern void wr_idtr(desctbr_t *); 163 extern void rd_gdtr(desctbr_t *); 164 extern void wr_gdtr(desctbr_t *); 165 extern void wr_ldtr(selector_t); 166 extern selector_t rd_ldtr(void); 167 extern void wr_tsr(selector_t); 168 extern void kmdb_enter(void); 169 170 #if defined(__amd64) 171 172 /* 173 * inlines for update_segregs 174 */ 175 extern void __set_ds(selector_t); 176 extern void __set_es(selector_t); 177 extern void __set_fs(selector_t); 178 extern void __set_gs(selector_t); 179 extern void __swapgs(void); 180 #endif /* __amd64 */ 181 182 #if defined(__amd64) 183 extern void load_segment_registers(selector_t, selector_t, selector_t, 184 selector_t); /* (alphabetical) */ 185 #elif defined(__i386) 186 extern void load_segment_registers(selector_t, selector_t, selector_t, 187 selector_t, selector_t, selector_t); /* (alphabetical) */ 188 #endif /* __i386 */ 189 190 selector_t get_cs_register(); 191 192 #if !defined(__amd64) 193 194 /* 195 * User segment descriptors (code and data). 196 * Legacy mode 64-bits wide. 197 */ 198 typedef struct user_desc { 199 uint32_t usd_lolimit:16; /* segment limit 15:0 */ 200 uint32_t usd_lobase:16; /* segment base 15:0 */ 201 uint32_t usd_midbase:8; /* segment base 23:16 */ 202 uint32_t usd_type:5; /* segment type, includes S bit */ 203 uint32_t usd_dpl:2; /* segment descriptor priority level */ 204 uint32_t usd_p:1; /* segment descriptor present */ 205 uint32_t usd_hilimit:4; /* segment limit 19:16 */ 206 uint32_t usd_avl:1; /* available to sw, but not used */ 207 uint32_t usd_reserved:1; /* unused, ignored */ 208 uint32_t usd_def32:1; /* default 32 vs 16 bit operand */ 209 uint32_t usd_gran:1; /* limit units (bytes vs pages) */ 210 uint32_t usd_hibase:8; /* segment base 31:24 */ 211 } user_desc_t; 212 213 #define USEGD_GETBASE(usd) ((usd)->usd_lobase | \ 214 (usd)->usd_midbase << 16 | \ 215 (usd)->usd_hibase << (16 + 8)) 216 217 #define USEGD_SETBASE(usd, b) ((usd)->usd_lobase = (b), \ 218 (usd)->usd_midbase = (b) >> 16, \ 219 (usd)->usd_hibase = (b) >> (16 + 8)) 220 221 #define USEGD_GETLIMIT(usd) ((usd)->usd_lolimit | \ 222 (usd)->usd_hilimit << 16) 223 224 #define USEGD_SETLIMIT(usd, lim) ((usd)->usd_lolimit = lim, \ 225 (usd)->usd_hilimit = lim >> 16) 226 227 #define USD_TYPESHIFT 5 /* size of usd_type field */ 228 229 #else /* __amd64 */ 230 231 /* 232 * User segment descriptors. 233 * Long mode 64-bits wide. 234 * 235 * In 32-bit compatibility mode (%cs:usd_long=0) all fields are interpreted 236 * as in legacy mode for both code and data. 237 * 238 * In 64-bit mode (%cs:usd_long=1) code segments only have the conforming 239 * bit in usd_type, usd_dpl, usd_p, usd_long and usd_def32=0. usd_def32 240 * must be zero in 64-bit mode. Setting it to 1 is reserved for future use. 241 * All other fields are loaded but ignored by hardware. 242 * 243 * 64-bit data segments only have usd_p. All other fields are loaded but 244 * ignored by hardware when in 64-bit mode. 245 */ 246 typedef struct user_desc { 247 uint64_t usd_lolimit:16; /* segment limit 15:0 */ 248 uint64_t usd_lobase:16; /* segment base 15:0 */ 249 uint64_t usd_midbase:8; /* segment base 23:16 */ 250 uint64_t usd_type:5; /* segment type, includes S bit */ 251 uint64_t usd_dpl:2; /* segment descriptor priority level */ 252 uint64_t usd_p:1; /* segment descriptor present */ 253 uint64_t usd_hilimit:4; /* segment limit 19:16 */ 254 uint64_t usd_avl:1; /* available to sw, but not used */ 255 uint64_t usd_long:1; /* long mode (%cs only) */ 256 uint64_t usd_def32:1; /* default 32 vs 16 bit operand */ 257 uint64_t usd_gran:1; /* limit units (bytes vs page) */ 258 uint64_t usd_hibase:8; /* segment base 31:24 */ 259 } user_desc_t; 260 261 #define USEGD_GETBASE(usd) ((usd)->usd_lobase | \ 262 (usd)->usd_midbase << 16 | \ 263 (usd)->usd_hibase << (16 + 8)) 264 265 #define USEGD_SETBASE(usd, b) ((usd)->usd_lobase = (b), \ 266 (usd)->usd_midbase = (b) >> 16, \ 267 (usd)->usd_hibase = (b) >> (16 + 8)) 268 269 #define USEGD_GETLIMIT(usd) ((usd)->usd_lolimit | \ 270 (usd)->usd_hilimit << 16) 271 272 #define USEGD_SETLIMIT(usd, lim) ((usd)->usd_lolimit = lim, \ 273 (usd)->usd_hilimit = lim >> 16) 274 275 #define USD_TYPESHIFT 5 /* size of usd_type field */ 276 277 #endif /* __amd64 */ 278 279 #if !defined(__amd64) 280 281 /* 282 * System segment descriptors for LDT and TSS segments. 283 * Legacy mode 64-bits wide. 284 */ 285 typedef struct system_desc { 286 uint32_t ssd_lolimit:16; /* segment limit 15:0 */ 287 uint32_t ssd_lobase:16; /* segment base 15:0 */ 288 uint32_t ssd_midbase:8; /* segment base 23:16 */ 289 uint32_t ssd_type:4; /* segment type */ 290 uint32_t ssd_zero:1; /* must be zero */ 291 uint32_t ssd_dpl:2; /* segment descriptor priority level */ 292 uint32_t ssd_p:1; /* segment descriptor present */ 293 uint32_t ssd_hilimit:4; /* segment limit 19:16 */ 294 uint32_t ssd_avl:1; /* available to sw, but not used */ 295 uint32_t ssd_reserved:2; /* unused, ignored */ 296 uint32_t ssd_gran:1; /* limit unit (bytes vs pages) */ 297 uint32_t ssd_hibase:8; /* segment base 31:24 */ 298 } system_desc_t; 299 300 #else /* __amd64 */ 301 302 /* 303 * System segment descriptors for LDT and TSS segments. 304 * Long mode 128-bits wide. 305 * 306 * 32-bit LDT and TSS descriptor types are redefined to 64-bit equivalents. 307 * All other legacy types are reserved and illegal. 308 */ 309 typedef struct system_desc { 310 uint64_t ssd_lolimit:16; /* segment limit 15:0 */ 311 uint64_t ssd_lobase:16; /* segment base 15:0 */ 312 uint64_t ssd_midbase:8; /* segment base 23:16 */ 313 uint64_t ssd_type:4; /* segment type */ 314 uint64_t ssd_zero1:1; /* must be zero */ 315 uint64_t ssd_dpl:2; /* segment descriptor priority level */ 316 uint64_t ssd_p:1; /* segment descriptor present */ 317 uint64_t ssd_hilimit:4; /* segment limit 19:16 */ 318 uint64_t ssd_avl:1; /* available to sw, but not used */ 319 uint64_t ssd_resv1:2; /* unused, ignored */ 320 uint64_t ssd_gran:1; /* limit unit (bytes vs pages) */ 321 uint64_t ssd_hibase:8; /* segment base 31:24 */ 322 uint64_t ssd_hi64base:32; /* segment base 63:32 */ 323 uint64_t ssd_resv2:8; /* unused, ignored */ 324 uint64_t ssd_zero2:5; /* must be zero */ 325 uint64_t ssd_resv3:19; /* unused, ignored */ 326 } system_desc_t; 327 328 #endif /* __amd64 */ 329 330 #define SYSSEGD_SETLIMIT(ssd, lim) ((ssd)->ssd_lolimit = lim, \ 331 (ssd)->ssd_hilimit = lim >> 16) 332 333 #define SYSSEGD_GETLIMIT(ssd) (((ssd)->ssd_hilimit << 16) | \ 334 (ssd)->ssd_lolimit) 335 336 #if !defined(__amd64) 337 338 /* 339 * System gate segment descriptors for interrupt, trap, call and task gates. 340 * Legacy mode 64-bits wide. 341 */ 342 typedef struct gate_desc { 343 uint32_t sgd_looffset:16; /* segment code offset 15:0 */ 344 uint32_t sgd_selector:16; /* target code or task selector */ 345 uint32_t sgd_stkcpy:5; /* number of stack wds to cpy */ 346 uint32_t sgd_resv:3; /* unused, ignored */ 347 uint32_t sgd_type:5; /* segment type, includes S bit */ 348 uint32_t sgd_dpl:2; /* segment descriptor priority level */ 349 uint32_t sgd_p:1; /* segment descriptor present */ 350 uint32_t sgd_hioffset:16; /* code seg off 31:16 */ 351 } gate_desc_t; 352 353 #define GATESEG_GETOFFSET(sgd) ((sgd)->sgd_looffset | \ 354 (sgd)->sgd_hioffset << 16) 355 356 #else /* __amd64 */ 357 358 /* 359 * System segment descriptors for interrupt, trap and call gates. 360 * Long mode 128-bits wide. 361 * 362 * 32-bit interrupt, trap and call gate types are redefined to 64-bit 363 * equivalents. Task gates along with all other legacy types are reserved 364 * and illegal. 365 */ 366 typedef struct gate_desc { 367 uint64_t sgd_looffset:16; /* segment code offset 15:0 */ 368 uint64_t sgd_selector:16; /* target code or task selector */ 369 uint64_t sgd_ist:3; /* IST table index */ 370 uint64_t sgd_resv1:5; /* unused, ignored */ 371 uint64_t sgd_type:5; /* segment type, includes S bit */ 372 uint64_t sgd_dpl:2; /* segment descriptor priority level */ 373 uint64_t sgd_p:1; /* segment descriptor present */ 374 uint64_t sgd_hioffset:16; /* segment code offset 31:16 */ 375 uint64_t sgd_hi64offset:32; /* segment code offset 63:32 */ 376 uint64_t sgd_resv2:8; /* unused, ignored */ 377 uint64_t sgd_zero:5; /* call gate only: must be zero */ 378 uint64_t sgd_resv3:19; /* unused, ignored */ 379 } gate_desc_t; 380 381 #define GATESEG_GETOFFSET(sgd) ((sgd)->sgd_looffset | \ 382 (sgd)->sgd_hioffset << 16 | \ 383 (sgd)->sgd_hi64offset << 32) 384 385 #endif /* __amd64 */ 386 387 /* 388 * functions for initializing and updating segment descriptors. 389 */ 390 #if defined(__amd64) 391 392 extern void set_usegd(user_desc_t *, uint_t, void *, size_t, uint_t, uint_t, 393 uint_t, uint_t); 394 395 #elif defined(__i386) 396 397 extern void set_usegd(user_desc_t *, void *, size_t, uint_t, uint_t, 398 uint_t, uint_t); 399 400 #endif /* __i386 */ 401 402 extern void set_gatesegd(gate_desc_t *, void (*)(void), selector_t, 403 uint_t, uint_t, uint_t); 404 405 extern void set_syssegd(system_desc_t *, void *, size_t, uint_t, uint_t); 406 407 extern void *get_ssd_base(system_desc_t *); 408 409 extern void gdt_update_usegd(uint_t, user_desc_t *); 410 411 extern int ldt_update_segd(user_desc_t *, user_desc_t *); 412 413 #if defined(__xpv) 414 415 extern int xen_idt_to_trap_info(uint_t, gate_desc_t *, void *); 416 extern void xen_idt_write(gate_desc_t *, uint_t); 417 418 #endif /* __xen */ 419 420 void init_boot_gdt(user_desc_t *); 421 422 #endif /* _ASM */ 423 424 /* 425 * Common segment parameter defintions for granularity, default 426 * operand size and operaton mode. 427 */ 428 #define SDP_BYTES 0 /* segment limit scaled to bytes */ 429 #define SDP_PAGES 1 /* segment limit scaled to pages */ 430 #define SDP_OP32 1 /* code and data default operand = 32 bits */ 431 #define SDP_LONG 1 /* long mode code segment (64 bits) */ 432 #define SDP_SHORT 0 /* compat/legacy code segment (32 bits) */ 433 /* 434 * System segments and gate types. 435 * 436 * In long mode i386 32-bit ldt, tss, call, interrupt and trap gate 437 * types are redefined into 64-bit equivalents. 438 */ 439 #define SDT_SYSNULL 0 /* system null */ 440 #define SDT_SYS286TSS 1 /* system 286 TSS available */ 441 #define SDT_SYSLDT 2 /* system local descriptor table */ 442 #define SDT_SYS286BSY 3 /* system 286 TSS busy */ 443 #define SDT_SYS286CGT 4 /* system 286 call gate */ 444 #define SDT_SYSTASKGT 5 /* system task gate */ 445 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 446 #define SDT_SYS286TGT 7 /* system 286 trap gate */ 447 #define SDT_SYSNULL2 8 /* system null again */ 448 #define SDT_SYSTSS 9 /* system TSS available */ 449 #define SDT_SYSNULL3 10 /* system null again */ 450 #define SDT_SYSTSSBSY 11 /* system TSS busy */ 451 #define SDT_SYSCGT 12 /* system call gate */ 452 #define SDT_SYSNULL4 13 /* system null again */ 453 #define SDT_SYSIGT 14 /* system interrupt gate */ 454 #define SDT_SYSTGT 15 /* system trap gate */ 455 456 /* 457 * Memory segment types. 458 * 459 * While in long mode expand-down, writable and accessed type field 460 * attributes are ignored. Only the conforming bit is loaded by hardware 461 * for long mode code segment descriptors. 462 */ 463 #define SDT_MEMRO 16 /* read only */ 464 #define SDT_MEMROA 17 /* read only accessed */ 465 #define SDT_MEMRW 18 /* read write */ 466 #define SDT_MEMRWA 19 /* read write accessed */ 467 #define SDT_MEMROD 20 /* read only expand dwn limit */ 468 #define SDT_MEMRODA 21 /* read only expand dwn limit accessed */ 469 #define SDT_MEMRWD 22 /* read write expand dwn limit */ 470 #define SDT_MEMRWDA 23 /* read write expand dwn limit accessed */ 471 #define SDT_MEME 24 /* execute only */ 472 #define SDT_MEMEA 25 /* execute only accessed */ 473 #define SDT_MEMER 26 /* execute read */ 474 #define SDT_MEMERA 27 /* execute read accessed */ 475 #define SDT_MEMEC 28 /* execute only conforming */ 476 #define SDT_MEMEAC 29 /* execute only accessed conforming */ 477 #define SDT_MEMERC 30 /* execute read conforming */ 478 #define SDT_MEMERAC 31 /* execute read accessed conforming */ 479 480 /* 481 * Entries in the Interrupt Descriptor Table (IDT) 482 */ 483 #define IDT_DE 0 /* #DE: Divide Error */ 484 #define IDT_DB 1 /* #DB: Debug */ 485 #define IDT_NMI 2 /* Nonmaskable External Interrupt */ 486 #define IDT_BP 3 /* #BP: Breakpoint */ 487 #define IDT_OF 4 /* #OF: Overflow */ 488 #define IDT_BR 5 /* #BR: Bound Range Exceeded */ 489 #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ 490 #define IDT_NM 7 /* #NM: No Math Coprocessor */ 491 #define IDT_DF 8 /* #DF: Double Fault */ 492 #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ 493 #define IDT_TS 10 /* #TS: Invalid TSS */ 494 #define IDT_NP 11 /* #NP: Segment Not Present */ 495 #define IDT_SS 12 /* #SS: Stack Segment Fault */ 496 #define IDT_GP 13 /* #GP: General Protection Fault */ 497 #define IDT_PF 14 /* #PF: Page Fault */ 498 #define IDT_MF 16 /* #MF: FPU Floating-Point Error */ 499 #define IDT_AC 17 /* #AC: Alignment Check */ 500 #define IDT_MC 18 /* #MC: Machine Check */ 501 #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ 502 #define NIDT 256 /* size in entries of IDT */ 503 504 /* 505 * Entries in the Global Descriptor Table (GDT) 506 * 507 * We make sure to space the system descriptors (LDT's, TSS') 508 * such that they are double gdt slot aligned. This is because 509 * in long mode system segment decriptors expand to 128 bits. 510 * 511 * GDT_LWPFS and GDT_LWPGS must be the same for both 32 and 64-bit 512 * kernels. See setup_context in libc. 64-bit processes must set 513 * %fs or %gs to null selector to use 64-bit fsbase or gsbase 514 * respectively. 515 */ 516 #define GDT_NULL 0 /* null */ 517 #define GDT_B32DATA 1 /* dboot 32 bit data descriptor */ 518 #define GDT_B32CODE 2 /* dboot 32 bit code descriptor */ 519 #define GDT_B16CODE 3 /* bios call 16 bit code descriptor */ 520 #define GDT_B16DATA 4 /* bios call 16 bit data descriptor */ 521 #define GDT_B64CODE 5 /* dboot 64 bit code descriptor */ 522 #define GDT_BGSTMP 7 /* kmdb descriptor only used early in boot */ 523 524 #if defined(__amd64) 525 526 #define GDT_KCODE 6 /* kernel code seg %cs */ 527 #define GDT_KDATA 7 /* kernel data seg %ds */ 528 #define GDT_U32CODE 8 /* 32-bit process on 64-bit kernel %cs */ 529 #define GDT_UDATA 9 /* user data seg %ds (32 and 64 bit) */ 530 #define GDT_UCODE 10 /* native user code seg %cs */ 531 #define GDT_LDT 12 /* LDT for current process */ 532 #define GDT_KTSS 14 /* kernel tss */ 533 #define GDT_FS GDT_NULL /* kernel %fs segment selector */ 534 #define GDT_GS GDT_NULL /* kernel %gs segment selector */ 535 #define GDT_LWPFS 55 /* lwp private %fs segment selector (32-bit) */ 536 #define GDT_LWPGS 56 /* lwp private %gs segment selector (32-bit) */ 537 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */ 538 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */ 539 #define NGDT 62 /* number of entries in GDT */ 540 541 /* 542 * This selector is only used in the temporary GDT used to bring additional 543 * CPUs from 16-bit real mode into long mode in real_mode_start(). 544 */ 545 #define TEMPGDT_KCODE64 1 /* 64-bit code selector */ 546 547 #elif defined(__i386) 548 549 #define GDT_LDT 40 /* LDT for current process */ 550 #define GDT_KTSS 42 /* kernel tss */ 551 #define GDT_KCODE 43 /* kernel code seg %cs */ 552 #define GDT_KDATA 44 /* kernel data seg %ds */ 553 #define GDT_UCODE 45 /* native user code seg %cs */ 554 #define GDT_UDATA 46 /* user data seg %ds (32 and 64 bit) */ 555 #define GDT_DBFLT 47 /* double fault #DF selector */ 556 #define GDT_FS 53 /* kernel %fs segment selector */ 557 #define GDT_GS 54 /* kernel %gs segment selector */ 558 #define GDT_LWPFS 55 /* lwp private %fs segment selector */ 559 #define GDT_LWPGS 56 /* lwp private %gs segment selector */ 560 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */ 561 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */ 562 #if !defined(__xpv) 563 #define NGDT 90 /* number of entries in GDT */ 564 #else 565 #define NGDT 512 /* single 4K page for the hypervisor */ 566 #endif 567 568 #endif /* __i386 */ 569 570 /* 571 * Convenient selector definitions. 572 */ 573 574 /* 575 * XXPV 64 bit Xen only allows the guest %cs/%ss be the private ones it 576 * provides, not the ones we create for ourselves. See FLAT_RING3_CS64 in 577 * public/arch-x86_64.h 578 * 579 * 64-bit Xen runs paravirtual guests in ring 3 but emulates them running in 580 * ring 0 by clearing CPL in %cs value pushed on guest exception stacks. 581 * Therefore we will have KCS_SEL value indicate ring 0 and use that everywhere 582 * in the kernel. But in the few files where we initialize segment registers or 583 * create and update descriptors we will explicity OR in SEL_KPL (ring 3) for 584 * kernel %cs. See desctbls.c for an example. 585 */ 586 587 #if defined(__xpv) && defined(__amd64) 588 #define KCS_SEL 0xe030 /* FLAT_RING3_CS64 & 0xFFF0 */ 589 #define KDS_SEL 0xe02b /* FLAT_RING3_SS64 */ 590 #else 591 #define KCS_SEL SEL_GDT(GDT_KCODE, SEL_KPL) 592 #define KDS_SEL SEL_GDT(GDT_KDATA, SEL_KPL) 593 #endif 594 595 #define UCS_SEL SEL_GDT(GDT_UCODE, SEL_UPL) 596 #if defined(__amd64) 597 #define TEMP_CS64_SEL SEL_GDT(TEMPGDT_KCODE64, SEL_KPL) 598 #define U32CS_SEL SEL_GDT(GDT_U32CODE, SEL_UPL) 599 #endif 600 601 #define UDS_SEL SEL_GDT(GDT_UDATA, SEL_UPL) 602 #define ULDT_SEL SEL_GDT(GDT_LDT, SEL_KPL) 603 #define KTSS_SEL SEL_GDT(GDT_KTSS, SEL_KPL) 604 #define DFTSS_SEL SEL_GDT(GDT_DBFLT, SEL_KPL) 605 #define KFS_SEL 0 606 #define KGS_SEL SEL_GDT(GDT_GS, SEL_KPL) 607 #define LWPFS_SEL SEL_GDT(GDT_LWPFS, SEL_UPL) 608 #define LWPGS_SEL SEL_GDT(GDT_LWPGS, SEL_UPL) 609 #define BRANDMIN_SEL SEL_GDT(GDT_BRANDMIN, SEL_UPL) 610 #define BRANDMAX_SEL SEL_GDT(GDT_BRANDMAX, SEL_UPL) 611 612 #define B64CODE_SEL SEL_GDT(GDT_B64CODE, SEL_KPL) 613 #define B32CODE_SEL SEL_GDT(GDT_B32CODE, SEL_KPL) 614 #define B32DATA_SEL SEL_GDT(GDT_B32DATA, SEL_KPL) 615 #define B16CODE_SEL SEL_GDT(GDT_B16CODE, SEL_KPL) 616 #define B16DATA_SEL SEL_GDT(GDT_B16DATA, SEL_KPL) 617 618 /* 619 * Temporary %gs descriptor used by kmdb with -d option. Only lives 620 * in boot's GDT and is not copied into kernel's GDT from boot. 621 */ 622 #define KMDBGS_SEL SEL_GDT(GDT_BGSTMP, SEL_KPL) 623 624 /* 625 * Selector used for kdi_idt when kmdb has taken over the IDT. 626 */ 627 #if defined(__amd64) 628 #define KMDBCODE_SEL B64CODE_SEL 629 #else 630 #define KMDBCODE_SEL B32CODE_SEL 631 #endif 632 633 /* 634 * Entries in default Local Descriptor Table (LDT) for every process. 635 */ 636 #define LDT_SYSCALL 0 /* call gate for libc.a (obsolete) */ 637 #define LDT_SIGCALL 1 /* EOL me, call gate for static sigreturn */ 638 #define LDT_RESVD1 2 /* old user %cs */ 639 #define LDT_RESVD2 3 /* old user %ds */ 640 #define LDT_ALTSYSCALL 4 /* alternate call gate for system calls */ 641 #define LDT_ALTSIGCALL 5 /* EOL me, alternate call gate for sigreturn */ 642 #define LDT_UDBASE 6 /* user descriptor base index */ 643 #define MINNLDT 512 /* Current min solaris ldt size (1 4K page) */ 644 #define MAXNLDT 8192 /* max solaris ldt size (16 4K pages) */ 645 646 #ifndef _ASM 647 648 extern gate_desc_t *idt0; 649 extern desctbr_t idt0_default_reg; 650 extern user_desc_t *gdt0; 651 652 extern user_desc_t zero_udesc; 653 extern user_desc_t null_udesc; 654 extern system_desc_t null_sdesc; 655 656 #if defined(__amd64) 657 extern user_desc_t zero_u32desc; 658 #endif 659 #if defined(__amd64) 660 extern user_desc_t ucs_on; 661 extern user_desc_t ucs_off; 662 extern user_desc_t ucs32_on; 663 extern user_desc_t ucs32_off; 664 #endif /* __amd64 */ 665 666 extern struct tss *ktss0; 667 668 #if defined(__i386) 669 extern struct tss *dftss0; 670 #endif /* __i386 */ 671 672 extern void div0trap(), dbgtrap(), nmiint(), brktrap(), ovflotrap(); 673 extern void boundstrap(), invoptrap(), ndptrap(); 674 #if !defined(__xpv) 675 extern void syserrtrap(); 676 #endif 677 extern void invaltrap(), invtsstrap(), segnptrap(), stktrap(); 678 extern void gptrap(), pftrap(), ndperr(); 679 extern void overrun(), resvtrap(); 680 extern void _start(), cmnint(); 681 extern void achktrap(), mcetrap(); 682 extern void xmtrap(); 683 extern void fasttrap(); 684 extern void sys_int80(); 685 extern void brand_sys_int80(); 686 extern void dtrace_ret(); 687 688 #if !defined(__amd64) 689 extern void pentium_pftrap(); 690 #endif 691 692 #endif /* _ASM */ 693 694 #ifdef __cplusplus 695 } 696 #endif 697 698 #endif /* _SYS_SEGMENTS_H */ 699
Indexes created Wed Feb 10 05:58:14 UTC 2010
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