1 /* 2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved. 3 */ 4 /* 5 * Copyright 2019 Joyent, Inc. 6 * Copyright 2022 Oxide Computer Company 7 */ 8 9 #ifndef _SYS_SEGMENTS_H 10 #define _SYS_SEGMENTS_H 11 12 #ifdef __cplusplus 13 extern "C" { 14 #endif 15 16 /* 17 * Copyright (c) 1989, 1990 William F. Jolitz 18 * Copyright (c) 1990 The Regents of the University of California. 19 * All rights reserved. 20 * 21 * This code is derived from software contributed to Berkeley by 22 * William Jolitz. 23 * 24 * Redistribution and use in source and binary forms, with or without 25 * modification, are permitted provided that the following conditions 26 * are met: 27 * 1. Redistributions of source code must retain the above copyright 28 * notice, this list of conditions and the following disclaimer. 29 * 2. Redistributions in binary form must reproduce the above copyright 30 * notice, this list of conditions and the following disclaimer in the 31 * documentation and/or other materials provided with the distribution. 32 * 3. All advertising materials mentioning features or use of this software 33 * must display the following acknowledgement: 34 * This product includes software developed by the University of 35 * California, Berkeley and its contributors. 36 * 4. Neither the name of the University nor the names of its contributors 37 * may be used to endorse or promote products derived from this software 38 * without specific prior written permission. 39 * 40 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 53 * $FreeBSD: src/sys/i386/include/segments.h,v 1.34 2003/09/10 01:07:04 54 * jhb Exp $ 55 * 56 * 386 Segmentation Data Structures and definitions 57 * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989 58 */ 59 60 #include <sys/tss.h> 61 62 /* 63 * Selector register format 64 * CS, DS, ES, FS, GS, SS 65 * 66 * 15 3 2 1 0 67 * +---------------------+---+----+ 68 * | SI |TI |RPL | 69 * +---------------------+---+----+ 70 * 71 * SI = selector index 72 * TI = table indicator (0 = GDT, 1 = LDT) 73 * RPL = requestor privilege level 74 */ 75 #define IDXTOSEL(s) ((s) << 3) /* index to selector */ 76 #define SELTOIDX(s) ((s) >> 3) /* selector to index */ 77 #define SEL_GDT(s, r) (IDXTOSEL(s) | r) /* global sel */ 78 79 /* 80 * SEL_(KPL,UPL,XPL) is the RPL or DPL value for code and data selectors 81 * and their descriptors respectively. 82 * 83 * TRP_(KPL,UPL,XPL) is used to indicate the DPL for system gates only. 84 * 85 * This distinction is important to support para-virt guests on the 86 * 64-bit hypervisor. Both guest kernel and user run in ring 3 and the 87 * hypervisor runs in ring 0. When the kernel creates its trap and 88 * interrupt gates it needs a way to prevent any arbitrary int $n 89 * instruction from entering a gate that is not expected. The hypervisor 90 * allows these gates to have a DPL from 1 to 3. By creating gates 91 * with a DPL below user (ring 3) the int $n will generate a #gp fault 92 * which the hypervisor catches and forwards to the guest. 93 */ 94 #if defined(__xpv) 95 96 #define SEL_XPL 0 /* hypervisor privilege level */ 97 #define SEL_KPL 3 /* both kernel and user in ring 3 */ 98 #define TRP_KPL 1 /* system gate priv (user blocked) */ 99 #define TRP_XPL 0 /* system gate priv (hypervisor) */ 100 101 #define IST_DBG 0 102 103 #else /* __xpv */ 104 105 #define SEL_KPL 0 /* kernel privilege level on metal */ 106 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */ 107 108 109 #define IST_DF 1 110 #define IST_NMI 2 111 #define IST_MCE 3 112 #define IST_DBG 4 113 #define IST_NESTABLE 5 114 #define IST_DEFAULT 6 115 116 #endif /* __xpv */ 117 118 #define IST_NONE 0 119 120 #define SEL_UPL 3 /* user priority level */ 121 #define TRP_UPL 3 /* system gate priv (user allowed) */ 122 #define SEL_TI_LDT 4 /* local descriptor table */ 123 #define SEL_LDT(s) (IDXTOSEL(s) | SEL_TI_LDT | SEL_UPL) /* local sel */ 124 #define CPL_MASK 3 /* RPL mask for selector */ 125 #define SELISLDT(s) (((s) & SEL_TI_LDT) == SEL_TI_LDT) 126 #define SELISUPL(s) (((s) & CPL_MASK) == SEL_UPL) 127 128 #ifndef _ASM 129 130 typedef uint16_t selector_t; /* selector reigster */ 131 132 /* 133 * Hardware descriptor table register format for GDT and IDT. 134 */ 135 #if defined(__amd64) 136 137 #pragma pack(2) 138 typedef struct { 139 uint16_t dtr_limit; /* table limit */ 140 uint64_t dtr_base; /* table base address */ 141 } desctbr_t; 142 #pragma pack() 143 144 #elif defined(__i386) 145 146 #pragma pack(2) 147 typedef struct { 148 uint16_t dtr_limit; /* table limit */ 149 uint32_t dtr_base; /* table base address */ 150 } desctbr_t; 151 #pragma pack() 152 153 #endif /* __i386 */ 154 155 /* 156 * Functions for loading and storing descriptor table 157 * registers. 158 */ 159 extern void rd_idtr(desctbr_t *); 160 extern void wr_idtr(desctbr_t *); 161 extern void rd_gdtr(desctbr_t *); 162 extern void wr_gdtr(desctbr_t *); 163 extern void wr_ldtr(selector_t); 164 extern selector_t rd_ldtr(void); 165 extern void wr_tsr(selector_t); 166 extern void kmdb_enter(void); 167 168 #if defined(__amd64) 169 170 /* 171 * inlines for update_segregs 172 */ 173 extern void __set_ds(selector_t); 174 extern void __set_es(selector_t); 175 extern void __set_fs(selector_t); 176 extern void __set_gs(selector_t); 177 #endif /* __amd64 */ 178 179 #if defined(__amd64) 180 extern void load_segment_registers(selector_t, selector_t, selector_t, 181 selector_t); /* (alphabetical) */ 182 #elif defined(__i386) 183 extern void load_segment_registers(selector_t, selector_t, selector_t, 184 selector_t, selector_t, selector_t); /* (alphabetical) */ 185 #endif /* __i386 */ 186 187 selector_t get_cs_register(); 188 189 #if !defined(__amd64) 190 191 /* 192 * User segment descriptors (code and data). 193 * Legacy mode 64-bits wide. 194 */ 195 typedef struct user_desc { 196 uint32_t usd_lolimit:16; /* segment limit 15:0 */ 197 uint32_t usd_lobase:16; /* segment base 15:0 */ 198 uint32_t usd_midbase:8; /* segment base 23:16 */ 199 uint32_t usd_type:5; /* segment type, includes S bit */ 200 uint32_t usd_dpl:2; /* segment descriptor priority level */ 201 uint32_t usd_p:1; /* segment descriptor present */ 202 uint32_t usd_hilimit:4; /* segment limit 19:16 */ 203 uint32_t usd_avl:1; /* available to sw, but not used */ 204 uint32_t usd_reserved:1; /* unused, ignored */ 205 uint32_t usd_def32:1; /* default 32 vs 16 bit operand */ 206 uint32_t usd_gran:1; /* limit units (bytes vs pages) */ 207 uint32_t usd_hibase:8; /* segment base 31:24 */ 208 } user_desc_t; 209 210 #define USEGD_GETBASE(usd) ((usd)->usd_lobase | \ 211 (usd)->usd_midbase << 16 | \ 212 (usd)->usd_hibase << (16 + 8)) 213 214 #define USEGD_SETBASE(usd, b) ((usd)->usd_lobase = (b), \ 215 (usd)->usd_midbase = (b) >> 16, \ 216 (usd)->usd_hibase = (b) >> (16 + 8)) 217 218 #define USEGD_GETLIMIT(usd) ((usd)->usd_lolimit | \ 219 (usd)->usd_hilimit << 16) 220 221 #define USEGD_SETLIMIT(usd, lim) ((usd)->usd_lolimit = lim, \ 222 (usd)->usd_hilimit = lim >> 16) 223 224 #define USD_TYPESHIFT 5 /* size of usd_type field */ 225 226 #else /* __amd64 */ 227 228 /* 229 * User segment descriptors. 230 * Long mode 64-bits wide. 231 * 232 * In 32-bit compatibility mode (%cs:usd_long=0) all fields are interpreted 233 * as in legacy mode for both code and data. 234 * 235 * In 64-bit mode (%cs:usd_long=1) code segments only have the conforming 236 * bit in usd_type, usd_dpl, usd_p, usd_long and usd_def32=0. usd_def32 237 * must be zero in 64-bit mode. Setting it to 1 is reserved for future use. 238 * All other fields are loaded but ignored by hardware. 239 * 240 * 64-bit data segments only have usd_p. All other fields are loaded but 241 * ignored by hardware when in 64-bit mode. 242 */ 243 typedef struct user_desc { 244 uint64_t usd_lolimit:16; /* segment limit 15:0 */ 245 uint64_t usd_lobase:16; /* segment base 15:0 */ 246 uint64_t usd_midbase:8; /* segment base 23:16 */ 247 uint64_t usd_type:5; /* segment type, includes S bit */ 248 uint64_t usd_dpl:2; /* segment descriptor priority level */ 249 uint64_t usd_p:1; /* segment descriptor present */ 250 uint64_t usd_hilimit:4; /* segment limit 19:16 */ 251 uint64_t usd_avl:1; /* available to sw, but not used */ 252 uint64_t usd_long:1; /* long mode (%cs only) */ 253 uint64_t usd_def32:1; /* default 32 vs 16 bit operand */ 254 uint64_t usd_gran:1; /* limit units (bytes vs page) */ 255 uint64_t usd_hibase:8; /* segment base 31:24 */ 256 } user_desc_t; 257 258 #define USEGD_GETBASE(usd) ((usd)->usd_lobase | \ 259 (usd)->usd_midbase << 16 | \ 260 (usd)->usd_hibase << (16 + 8)) 261 262 #define USEGD_SETBASE(usd, b) ((usd)->usd_lobase = (b), \ 263 (usd)->usd_midbase = (b) >> 16, \ 264 (usd)->usd_hibase = (b) >> (16 + 8)) 265 266 #define USEGD_GETLIMIT(usd) ((usd)->usd_lolimit | \ 267 (usd)->usd_hilimit << 16) 268 269 #define USEGD_SETLIMIT(usd, lim) ((usd)->usd_lolimit = lim, \ 270 (usd)->usd_hilimit = lim >> 16) 271 272 #define USD_TYPESHIFT 5 /* size of usd_type field */ 273 274 #endif /* __amd64 */ 275 276 #if !defined(__amd64) 277 278 /* 279 * System segment descriptors for LDT and TSS segments. 280 * Legacy mode 64-bits wide. 281 */ 282 typedef struct system_desc { 283 uint32_t ssd_lolimit:16; /* segment limit 15:0 */ 284 uint32_t ssd_lobase:16; /* segment base 15:0 */ 285 uint32_t ssd_midbase:8; /* segment base 23:16 */ 286 uint32_t ssd_type:4; /* segment type */ 287 uint32_t ssd_zero:1; /* must be zero */ 288 uint32_t ssd_dpl:2; /* segment descriptor priority level */ 289 uint32_t ssd_p:1; /* segment descriptor present */ 290 uint32_t ssd_hilimit:4; /* segment limit 19:16 */ 291 uint32_t ssd_avl:1; /* available to sw, but not used */ 292 uint32_t ssd_reserved:2; /* unused, ignored */ 293 uint32_t ssd_gran:1; /* limit unit (bytes vs pages) */ 294 uint32_t ssd_hibase:8; /* segment base 31:24 */ 295 } system_desc_t; 296 297 #else /* __amd64 */ 298 299 /* 300 * System segment descriptors for LDT and TSS segments. 301 * Long mode 128-bits wide. 302 * 303 * 32-bit LDT and TSS descriptor types are redefined to 64-bit equivalents. 304 * All other legacy types are reserved and illegal. 305 */ 306 typedef struct system_desc { 307 uint64_t ssd_lolimit:16; /* segment limit 15:0 */ 308 uint64_t ssd_lobase:16; /* segment base 15:0 */ 309 uint64_t ssd_midbase:8; /* segment base 23:16 */ 310 uint64_t ssd_type:4; /* segment type */ 311 uint64_t ssd_zero1:1; /* must be zero */ 312 uint64_t ssd_dpl:2; /* segment descriptor priority level */ 313 uint64_t ssd_p:1; /* segment descriptor present */ 314 uint64_t ssd_hilimit:4; /* segment limit 19:16 */ 315 uint64_t ssd_avl:1; /* available to sw, but not used */ 316 uint64_t ssd_resv1:2; /* unused, ignored */ 317 uint64_t ssd_gran:1; /* limit unit (bytes vs pages) */ 318 uint64_t ssd_hibase:8; /* segment base 31:24 */ 319 uint64_t ssd_hi64base:32; /* segment base 63:32 */ 320 uint64_t ssd_resv2:8; /* unused, ignored */ 321 uint64_t ssd_zero2:5; /* must be zero */ 322 uint64_t ssd_resv3:19; /* unused, ignored */ 323 } system_desc_t; 324 325 #endif /* __amd64 */ 326 327 #define SYSSEGD_SETLIMIT(ssd, lim) ((ssd)->ssd_lolimit = lim, \ 328 (ssd)->ssd_hilimit = lim >> 16) 329 330 #define SYSSEGD_GETLIMIT(ssd) (((ssd)->ssd_hilimit << 16) | \ 331 (ssd)->ssd_lolimit) 332 333 #if !defined(__amd64) 334 335 /* 336 * System gate segment descriptors for interrupt, trap, call and task gates. 337 * Legacy mode 64-bits wide. 338 */ 339 typedef struct gate_desc { 340 uint32_t sgd_looffset:16; /* segment code offset 15:0 */ 341 uint32_t sgd_selector:16; /* target code or task selector */ 342 uint32_t sgd_stkcpy:5; /* number of stack wds to cpy */ 343 uint32_t sgd_resv:3; /* unused, ignored */ 344 uint32_t sgd_type:5; /* segment type, includes S bit */ 345 uint32_t sgd_dpl:2; /* segment descriptor priority level */ 346 uint32_t sgd_p:1; /* segment descriptor present */ 347 uint32_t sgd_hioffset:16; /* code seg off 31:16 */ 348 } gate_desc_t; 349 350 #define GATESEG_GETOFFSET(sgd) ((uintptr_t)((sgd)->sgd_looffset | \ 351 (sgd)->sgd_hioffset << 16)) 352 353 #else /* __amd64 */ 354 355 /* 356 * System segment descriptors for interrupt, trap and call gates. 357 * Long mode 128-bits wide. 358 * 359 * 32-bit interrupt, trap and call gate types are redefined to 64-bit 360 * equivalents. Task gates along with all other legacy types are reserved 361 * and illegal. 362 */ 363 typedef struct gate_desc { 364 uint64_t sgd_looffset:16; /* segment code offset 15:0 */ 365 uint64_t sgd_selector:16; /* target code or task selector */ 366 uint64_t sgd_ist:3; /* IST table index */ 367 uint64_t sgd_resv1:5; /* unused, ignored */ 368 uint64_t sgd_type:5; /* segment type, includes S bit */ 369 uint64_t sgd_dpl:2; /* segment descriptor priority level */ 370 uint64_t sgd_p:1; /* segment descriptor present */ 371 uint64_t sgd_hioffset:16; /* segment code offset 31:16 */ 372 uint64_t sgd_hi64offset:32; /* segment code offset 63:32 */ 373 uint64_t sgd_resv2:8; /* unused, ignored */ 374 uint64_t sgd_zero:5; /* call gate only: must be zero */ 375 uint64_t sgd_resv3:19; /* unused, ignored */ 376 } gate_desc_t; 377 378 #define GATESEG_GETOFFSET(sgd) ((uintptr_t)((sgd)->sgd_looffset | \ 379 (sgd)->sgd_hioffset << 16 | \ 380 (uint64_t)((sgd)->sgd_hi64offset) << 32)) 381 382 #endif /* __amd64 */ 383 384 /* 385 * functions for initializing and updating segment descriptors. 386 */ 387 #if defined(__amd64) 388 389 extern void set_usegd(user_desc_t *, uint_t, void *, uint32_t, uint_t, uint_t, 390 uint_t, uint_t); 391 392 #elif defined(__i386) 393 394 extern void set_usegd(user_desc_t *, void *, size_t, uint_t, uint_t, 395 uint_t, uint_t); 396 397 #endif /* __i386 */ 398 399 extern uint_t idt_vector_to_ist(uint_t); 400 401 extern void set_gatesegd(gate_desc_t *, void (*)(void), selector_t, 402 uint_t, uint_t, uint_t); 403 404 extern void set_syssegd(system_desc_t *, void *, size_t, uint_t, uint_t); 405 406 extern void *get_ssd_base(system_desc_t *); 407 408 extern void gdt_update_usegd(uint_t, user_desc_t *); 409 410 extern int ldt_update_segd(user_desc_t *, user_desc_t *); 411 412 #if defined(__xpv) 413 414 extern int xen_idt_to_trap_info(uint_t, gate_desc_t *, void *); 415 extern void xen_idt_write(gate_desc_t *, uint_t); 416 417 #endif /* __xen */ 418 419 void init_boot_gdt(user_desc_t *); 420 421 #endif /* _ASM */ 422 423 /* 424 * Common segment parameter defintions for granularity, default 425 * operand size and operaton mode. 426 */ 427 #define SDP_BYTES 0 /* segment limit scaled to bytes */ 428 #define SDP_PAGES 1 /* segment limit scaled to pages */ 429 #define SDP_OP32 1 /* code and data default operand = 32 bits */ 430 #define SDP_LONG 1 /* long mode code segment (64 bits) */ 431 #define SDP_SHORT 0 /* compat/legacy code segment (32 bits) */ 432 433 /* 434 * The maximum segment limit that can be put into a segment descriptor for 435 * 16-bit and 32-bit segments. In 64-bit mode, segment base addresses are 436 * fixed to 0 and the segment limit is ignored. 437 */ 438 #define SDP_LIMIT_MAX 0xFFFFFU 439 440 /* 441 * System segments and gate types. 442 * 443 * In long mode i386 32-bit ldt, tss, call, interrupt and trap gate 444 * types are redefined into 64-bit equivalents. 445 */ 446 #define SDT_SYSNULL 0 /* system null */ 447 #define SDT_SYS286TSS 1 /* system 286 TSS available */ 448 #define SDT_SYSLDT 2 /* system local descriptor table */ 449 #define SDT_SYS286BSY 3 /* system 286 TSS busy */ 450 #define SDT_SYS286CGT 4 /* system 286 call gate */ 451 #define SDT_SYSTASKGT 5 /* system task gate */ 452 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 453 #define SDT_SYS286TGT 7 /* system 286 trap gate */ 454 #define SDT_SYSNULL2 8 /* system null again */ 455 #define SDT_SYSTSS 9 /* system TSS available */ 456 #define SDT_SYSNULL3 10 /* system null again */ 457 #define SDT_SYSTSSBSY 11 /* system TSS busy */ 458 #define SDT_SYSCGT 12 /* system call gate */ 459 #define SDT_SYSNULL4 13 /* system null again */ 460 #define SDT_SYSIGT 14 /* system interrupt gate */ 461 #define SDT_SYSTGT 15 /* system trap gate */ 462 463 /* 464 * Memory segment types. 465 * 466 * While in long mode expand-down, writable and accessed type field 467 * attributes are ignored. Only the conforming bit is loaded by hardware 468 * for long mode code segment descriptors. 469 */ 470 #define SDT_MEMRO 16 /* read only */ 471 #define SDT_MEMROA 17 /* read only accessed */ 472 #define SDT_MEMRW 18 /* read write */ 473 #define SDT_MEMRWA 19 /* read write accessed */ 474 #define SDT_MEMROD 20 /* read only expand dwn limit */ 475 #define SDT_MEMRODA 21 /* read only expand dwn limit accessed */ 476 #define SDT_MEMRWD 22 /* read write expand dwn limit */ 477 #define SDT_MEMRWDA 23 /* read write expand dwn limit accessed */ 478 #define SDT_MEME 24 /* execute only */ 479 #define SDT_MEMEA 25 /* execute only accessed */ 480 #define SDT_MEMER 26 /* execute read */ 481 #define SDT_MEMERA 27 /* execute read accessed */ 482 #define SDT_MEMEC 28 /* execute only conforming */ 483 #define SDT_MEMEAC 29 /* execute only accessed conforming */ 484 #define SDT_MEMERC 30 /* execute read conforming */ 485 #define SDT_MEMERAC 31 /* execute read accessed conforming */ 486 487 /* These bits are within the "type" field, like the values above. */ 488 #define SDT_A 0x01 /* accessed bit */ 489 #define SDT_S 0x10 /* S-bit at the top of "type" for usegs */ 490 491 /* 492 * Entries in the Interrupt Descriptor Table (IDT) 493 */ 494 #define IDT_DE 0 /* #DE: Divide Error */ 495 #define IDT_DB 1 /* #DB: Debug */ 496 #define IDT_NMI 2 /* Nonmaskable External Interrupt */ 497 #define IDT_BP 3 /* #BP: Breakpoint */ 498 #define IDT_OF 4 /* #OF: Overflow */ 499 #define IDT_BR 5 /* #BR: Bound Range Exceeded */ 500 #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ 501 #define IDT_NM 7 /* #NM: No Math Coprocessor */ 502 #define IDT_DF 8 /* #DF: Double Fault */ 503 #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ 504 #define IDT_TS 10 /* #TS: Invalid TSS */ 505 #define IDT_NP 11 /* #NP: Segment Not Present */ 506 #define IDT_SS 12 /* #SS: Stack Segment Fault */ 507 #define IDT_GP 13 /* #GP: General Protection Fault */ 508 #define IDT_PF 14 /* #PF: Page Fault */ 509 #define IDT_MF 16 /* #MF: FPU Floating-Point Error */ 510 #define IDT_AC 17 /* #AC: Alignment Check */ 511 #define IDT_MC 18 /* #MC: Machine Check */ 512 #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ 513 #define NIDT 256 /* size in entries of IDT */ 514 515 /* 516 * Entries in the Global Descriptor Table (GDT) 517 * 518 * We make sure to space the system descriptors (LDT's, TSS') 519 * such that they are double gdt slot aligned. This is because 520 * in long mode system segment decriptors expand to 128 bits. 521 * 522 * GDT_LWPFS and GDT_LWPGS must be the same for both 32 and 64-bit 523 * kernels. See setup_context in libc. 64-bit processes must set 524 * %fs or %gs to null selector to use 64-bit fsbase or gsbase 525 * respectively. 526 */ 527 #define GDT_NULL 0 /* null */ 528 #define GDT_B32DATA 1 /* dboot 32 bit data descriptor */ 529 #define GDT_B32CODE 2 /* dboot 32 bit code descriptor */ 530 #define GDT_B16CODE 3 /* bios call 16 bit code descriptor */ 531 #define GDT_B16DATA 4 /* bios call 16 bit data descriptor */ 532 #define GDT_B64CODE 5 /* dboot 64 bit code descriptor */ 533 #define GDT_BGSTMP 7 /* kmdb descriptor only used early in boot */ 534 #define GDT_CPUID 16 /* store numeric id of current CPU */ 535 536 /* 537 * Early boot code may need to create a temporary GDT; 538 * this is the minimum length required. 539 */ 540 #define LEN_MIN_GDT_BOOT (GDT_B64CODE + 1) 541 542 #if defined(__amd64) 543 544 #define GDT_KCODE 6 /* kernel code seg %cs */ 545 #define GDT_KDATA 7 /* kernel data seg %ds */ 546 #define GDT_U32CODE 8 /* 32-bit process on 64-bit kernel %cs */ 547 #define GDT_UDATA 9 /* user data seg %ds (32 and 64 bit) */ 548 #define GDT_UCODE 10 /* native user code seg %cs */ 549 #define GDT_LDT 12 /* (12-13) LDT for current process */ 550 #define GDT_KTSS 14 /* (14-15) kernel tss */ 551 #define GDT_FS GDT_NULL /* kernel %fs segment selector */ 552 #define GDT_GS GDT_NULL /* kernel %gs segment selector */ 553 #define GDT_LWPFS 55 /* lwp private %fs segment selector (32-bit) */ 554 #define GDT_LWPGS 56 /* lwp private %gs segment selector (32-bit) */ 555 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */ 556 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */ 557 #define NGDT 62 /* number of entries in GDT */ 558 559 /* 560 * This selector is only used in the temporary GDT used to bring additional 561 * CPUs from 16-bit real mode into long mode in real_mode_start(). 562 */ 563 #define TEMPGDT_KCODE64 1 /* 64-bit code selector */ 564 565 #elif defined(__i386) 566 567 #define GDT_LDT 40 /* LDT for current process */ 568 #define GDT_KTSS 42 /* kernel tss */ 569 #define GDT_KCODE 43 /* kernel code seg %cs */ 570 #define GDT_KDATA 44 /* kernel data seg %ds */ 571 #define GDT_UCODE 45 /* native user code seg %cs */ 572 #define GDT_UDATA 46 /* user data seg %ds (32 and 64 bit) */ 573 #define GDT_DBFLT 47 /* double fault #DF selector */ 574 #define GDT_FS 53 /* kernel %fs segment selector */ 575 #define GDT_GS 54 /* kernel %gs segment selector */ 576 #define GDT_LWPFS 55 /* lwp private %fs segment selector */ 577 #define GDT_LWPGS 56 /* lwp private %gs segment selector */ 578 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */ 579 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */ 580 #if !defined(__xpv) 581 #define NGDT 90 /* number of entries in GDT */ 582 #else 583 #define NGDT 512 /* single 4K page for the hypervisor */ 584 #endif 585 586 #endif /* __i386 */ 587 588 /* 589 * Convenient selector definitions. 590 */ 591 592 /* 593 * XXPV 64 bit Xen only allows the guest %cs/%ss be the private ones it 594 * provides, not the ones we create for ourselves. See FLAT_RING3_CS64 in 595 * public/arch-x86_64.h 596 * 597 * 64-bit Xen runs paravirtual guests in ring 3 but emulates them running in 598 * ring 0 by clearing CPL in %cs value pushed on guest exception stacks. 599 * Therefore we will have KCS_SEL value indicate ring 0 and use that everywhere 600 * in the kernel. But in the few files where we initialize segment registers or 601 * create and update descriptors we will explicity OR in SEL_KPL (ring 3) for 602 * kernel %cs. See desctbls.c for an example. 603 */ 604 605 #if defined(__xpv) && defined(__amd64) 606 #define KCS_SEL 0xe030 /* FLAT_RING3_CS64 & 0xFFF0 */ 607 #define KDS_SEL 0xe02b /* FLAT_RING3_SS64 */ 608 #else 609 #define KCS_SEL SEL_GDT(GDT_KCODE, SEL_KPL) 610 #define KDS_SEL SEL_GDT(GDT_KDATA, SEL_KPL) 611 #endif 612 613 #define UCS_SEL SEL_GDT(GDT_UCODE, SEL_UPL) 614 #if defined(__amd64) 615 #define TEMP_CS64_SEL SEL_GDT(TEMPGDT_KCODE64, SEL_KPL) 616 #define U32CS_SEL SEL_GDT(GDT_U32CODE, SEL_UPL) 617 #endif 618 619 #define UDS_SEL SEL_GDT(GDT_UDATA, SEL_UPL) 620 #define ULDT_SEL SEL_GDT(GDT_LDT, SEL_KPL) 621 #define KTSS_SEL SEL_GDT(GDT_KTSS, SEL_KPL) 622 #define DFTSS_SEL SEL_GDT(GDT_DBFLT, SEL_KPL) 623 #define KFS_SEL 0 624 #define KGS_SEL SEL_GDT(GDT_GS, SEL_KPL) 625 #define LWPFS_SEL SEL_GDT(GDT_LWPFS, SEL_UPL) 626 #define LWPGS_SEL SEL_GDT(GDT_LWPGS, SEL_UPL) 627 #define BRANDMIN_SEL SEL_GDT(GDT_BRANDMIN, SEL_UPL) 628 #define BRANDMAX_SEL SEL_GDT(GDT_BRANDMAX, SEL_UPL) 629 630 #define B64CODE_SEL SEL_GDT(GDT_B64CODE, SEL_KPL) 631 #define B32CODE_SEL SEL_GDT(GDT_B32CODE, SEL_KPL) 632 #define B32DATA_SEL SEL_GDT(GDT_B32DATA, SEL_KPL) 633 #define B16CODE_SEL SEL_GDT(GDT_B16CODE, SEL_KPL) 634 #define B16DATA_SEL SEL_GDT(GDT_B16DATA, SEL_KPL) 635 636 /* 637 * Temporary %gs descriptor used by kmdb with -d option. Only lives 638 * in boot's GDT and is not copied into kernel's GDT from boot. 639 */ 640 #define KMDBGS_SEL SEL_GDT(GDT_BGSTMP, SEL_KPL) 641 642 /* 643 * Selector used for kdi_idt when kmdb has taken over the IDT. 644 */ 645 #if defined(__amd64) 646 #define KMDBCODE_SEL B64CODE_SEL 647 #else 648 #define KMDBCODE_SEL B32CODE_SEL 649 #endif 650 651 /* 652 * Entries in default Local Descriptor Table (LDT) for every process. 653 */ 654 #define LDT_SYSCALL 0 /* call gate for libc.a (obsolete) */ 655 #define LDT_SIGCALL 1 /* EOL me, call gate for static sigreturn */ 656 #define LDT_RESVD1 2 /* old user %cs */ 657 #define LDT_RESVD2 3 /* old user %ds */ 658 #define LDT_ALTSYSCALL 4 /* alternate call gate for system calls */ 659 #define LDT_ALTSIGCALL 5 /* EOL me, alternate call gate for sigreturn */ 660 #define LDT_UDBASE 6 /* user descriptor base index */ 661 #define MINNLDT 512 /* Current min solaris ldt size (1 4K page) */ 662 #define MAXNLDT 8192 /* max solaris ldt size (16 4K pages) */ 663 664 #ifdef _KERNEL 665 #define LDT_CPU_SIZE (16 * 4096) /* Size of kernel per-CPU allocation */ 666 #endif 667 668 #ifndef _ASM 669 670 extern gate_desc_t *idt0; 671 extern desctbr_t idt0_default_reg; 672 extern user_desc_t *gdt0; 673 674 extern user_desc_t zero_udesc; 675 extern user_desc_t null_udesc; 676 extern system_desc_t null_sdesc; 677 678 #if defined(__amd64) 679 extern user_desc_t zero_u32desc; 680 #endif 681 #if defined(__amd64) 682 extern user_desc_t ucs_on; 683 extern user_desc_t ucs_off; 684 extern user_desc_t ucs32_on; 685 extern user_desc_t ucs32_off; 686 #endif /* __amd64 */ 687 688 extern tss_t *ktss0; 689 690 #if defined(__i386) 691 extern tss_t *dftss0; 692 #endif /* __i386 */ 693 694 extern void div0trap(), dbgtrap(), nmiint(), brktrap(), ovflotrap(); 695 extern void boundstrap(), invoptrap(), ndptrap(); 696 #if !defined(__xpv) 697 extern void syserrtrap(); 698 #endif 699 extern void invaltrap(), invtsstrap(), segnptrap(), stktrap(); 700 extern void gptrap(), pftrap(), ndperr(); 701 extern void overrun(), resvtrap(); 702 extern void _start(), cmnint(); 703 extern void achktrap(), mcetrap(); 704 extern void xmtrap(); 705 extern void fasttrap(); 706 extern void dtrace_ret(); 707 708 /* KPTI trampolines */ 709 extern void tr_invaltrap(); 710 extern void tr_div0trap(), tr_dbgtrap(), tr_nmiint(), tr_brktrap(); 711 extern void tr_ovflotrap(), tr_boundstrap(), tr_invoptrap(), tr_ndptrap(); 712 #if !defined(__xpv) 713 extern void tr_syserrtrap(); 714 #endif 715 extern void tr_invaltrap(), tr_invtsstrap(), tr_segnptrap(), tr_stktrap(); 716 extern void tr_gptrap(), tr_pftrap(), tr_ndperr(); 717 extern void tr_overrun(), tr_resvtrap(); 718 extern void tr_achktrap(), tr_mcetrap(); 719 extern void tr_xmtrap(); 720 extern void tr_fasttrap(); 721 extern void tr_dtrace_ret(); 722 723 #if !defined(__amd64) 724 extern void pentium_pftrap(); 725 #endif 726 727 extern uint64_t kpti_enable; 728 729 #endif /* _ASM */ 730 731 #ifdef __cplusplus 732 } 733 #endif 734 735 #endif /* _SYS_SEGMENTS_H */ 736