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