1 /*
2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4 /*
5 * Copyright 2011 Joyent, Inc. All rights reserved.
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 #if defined(__amd64)
102
103 #define SEL_XPL 0 /* hypervisor privilege level */
104 #define SEL_KPL 3 /* both kernel and user in ring 3 */
105 #define TRP_KPL 1 /* system gate priv (user blocked) */
106
107 #elif defined(__i386)
108
109 #define SEL_XPL 0 /* hypervisor privilege level */
110 #define SEL_KPL 1 /* kernel privilege level */
111 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */
112
113 #endif /* __i386 */
114
115 #define TRP_XPL 0 /* system gate priv (hypervisor) */
116
117 #else /* __xpv */
118
119 #define SEL_KPL 0 /* kernel privilege level on metal */
120 #define TRP_KPL SEL_KPL /* system gate priv (user blocked) */
121
122 #endif /* __xpv */
123
124 #define SEL_UPL 3 /* user priority level */
125 #define TRP_UPL 3 /* system gate priv (user allowed) */
126 #define SEL_TI_LDT 4 /* local descriptor table */
127 #define SEL_LDT(s) (IDXTOSEL(s) | SEL_TI_LDT | SEL_UPL) /* local sel */
128 #define CPL_MASK 3 /* RPL mask for selector */
129 #define SELISLDT(s) (((s) & SEL_TI_LDT) == SEL_TI_LDT)
130 #define SELISUPL(s) (((s) & CPL_MASK) == SEL_UPL)
131
132 #ifndef _ASM
133
134 typedef uint16_t selector_t; /* selector reigster */
135
136 /*
137 * Hardware descriptor table register format for GDT and IDT.
138 */
139 #if defined(__amd64)
140
141 #pragma pack(2)
142 typedef struct {
143 uint16_t dtr_limit; /* table limit */
144 uint64_t dtr_base; /* table base address */
145 } desctbr_t;
146 #pragma pack()
147
148 #elif defined(__i386)
149
150 #pragma pack(2)
151 typedef struct {
152 uint16_t dtr_limit; /* table limit */
153 uint32_t dtr_base; /* table base address */
154 } desctbr_t;
155 #pragma pack()
156
157 #endif /* __i386 */
158
159 /*
160 * Functions for loading and storing descriptor table
161 * registers.
162 */
163 extern void rd_idtr(desctbr_t *);
164 extern void wr_idtr(desctbr_t *);
165 extern void rd_gdtr(desctbr_t *);
166 extern void wr_gdtr(desctbr_t *);
167 extern void wr_ldtr(selector_t);
168 extern selector_t rd_ldtr(void);
169 extern void wr_tsr(selector_t);
170 extern void kmdb_enter(void);
171
172 #if defined(__amd64)
173
174 /*
175 * inlines for update_segregs
176 */
177 extern void __set_ds(selector_t);
178 extern void __set_es(selector_t);
179 extern void __set_fs(selector_t);
180 extern void __set_gs(selector_t);
181 extern void __swapgs(void);
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 void set_gatesegd(gate_desc_t *, void (*)(void), selector_t,
405 uint_t, uint_t, uint_t);
406
407 extern void set_syssegd(system_desc_t *, void *, size_t, uint_t, uint_t);
408
409 extern void *get_ssd_base(system_desc_t *);
410
411 extern void gdt_update_usegd(uint_t, user_desc_t *);
412
413 extern int ldt_update_segd(user_desc_t *, user_desc_t *);
414
415 #if defined(__xpv)
416
417 extern int xen_idt_to_trap_info(uint_t, gate_desc_t *, void *);
418 extern void xen_idt_write(gate_desc_t *, uint_t);
419
420 #endif /* __xen */
421
422 void init_boot_gdt(user_desc_t *);
423
424 #endif /* _ASM */
425
426 /*
427 * Common segment parameter defintions for granularity, default
428 * operand size and operaton mode.
429 */
430 #define SDP_BYTES 0 /* segment limit scaled to bytes */
431 #define SDP_PAGES 1 /* segment limit scaled to pages */
432 #define SDP_OP32 1 /* code and data default operand = 32 bits */
433 #define SDP_LONG 1 /* long mode code segment (64 bits) */
434 #define SDP_SHORT 0 /* compat/legacy code segment (32 bits) */
435 /*
436 * System segments and gate types.
437 *
438 * In long mode i386 32-bit ldt, tss, call, interrupt and trap gate
439 * types are redefined into 64-bit equivalents.
440 */
441 #define SDT_SYSNULL 0 /* system null */
442 #define SDT_SYS286TSS 1 /* system 286 TSS available */
443 #define SDT_SYSLDT 2 /* system local descriptor table */
444 #define SDT_SYS286BSY 3 /* system 286 TSS busy */
445 #define SDT_SYS286CGT 4 /* system 286 call gate */
446 #define SDT_SYSTASKGT 5 /* system task gate */
447 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */
448 #define SDT_SYS286TGT 7 /* system 286 trap gate */
449 #define SDT_SYSNULL2 8 /* system null again */
450 #define SDT_SYSTSS 9 /* system TSS available */
451 #define SDT_SYSNULL3 10 /* system null again */
452 #define SDT_SYSTSSBSY 11 /* system TSS busy */
453 #define SDT_SYSCGT 12 /* system call gate */
454 #define SDT_SYSNULL4 13 /* system null again */
455 #define SDT_SYSIGT 14 /* system interrupt gate */
456 #define SDT_SYSTGT 15 /* system trap gate */
457
458 /*
459 * Memory segment types.
460 *
461 * While in long mode expand-down, writable and accessed type field
462 * attributes are ignored. Only the conforming bit is loaded by hardware
463 * for long mode code segment descriptors.
464 */
465 #define SDT_MEMRO 16 /* read only */
466 #define SDT_MEMROA 17 /* read only accessed */
467 #define SDT_MEMRW 18 /* read write */
468 #define SDT_MEMRWA 19 /* read write accessed */
469 #define SDT_MEMROD 20 /* read only expand dwn limit */
470 #define SDT_MEMRODA 21 /* read only expand dwn limit accessed */
471 #define SDT_MEMRWD 22 /* read write expand dwn limit */
472 #define SDT_MEMRWDA 23 /* read write expand dwn limit accessed */
473 #define SDT_MEME 24 /* execute only */
474 #define SDT_MEMEA 25 /* execute only accessed */
475 #define SDT_MEMER 26 /* execute read */
476 #define SDT_MEMERA 27 /* execute read accessed */
477 #define SDT_MEMEC 28 /* execute only conforming */
478 #define SDT_MEMEAC 29 /* execute only accessed conforming */
479 #define SDT_MEMERC 30 /* execute read conforming */
480 #define SDT_MEMERAC 31 /* execute read accessed conforming */
481
482 /*
483 * Entries in the Interrupt Descriptor Table (IDT)
484 */
485 #define IDT_DE 0 /* #DE: Divide Error */
486 #define IDT_DB 1 /* #DB: Debug */
487 #define IDT_NMI 2 /* Nonmaskable External Interrupt */
488 #define IDT_BP 3 /* #BP: Breakpoint */
489 #define IDT_OF 4 /* #OF: Overflow */
490 #define IDT_BR 5 /* #BR: Bound Range Exceeded */
491 #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */
492 #define IDT_NM 7 /* #NM: No Math Coprocessor */
493 #define IDT_DF 8 /* #DF: Double Fault */
494 #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */
495 #define IDT_TS 10 /* #TS: Invalid TSS */
496 #define IDT_NP 11 /* #NP: Segment Not Present */
497 #define IDT_SS 12 /* #SS: Stack Segment Fault */
498 #define IDT_GP 13 /* #GP: General Protection Fault */
499 #define IDT_PF 14 /* #PF: Page Fault */
500 #define IDT_MF 16 /* #MF: FPU Floating-Point Error */
501 #define IDT_AC 17 /* #AC: Alignment Check */
502 #define IDT_MC 18 /* #MC: Machine Check */
503 #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
504 #define NIDT 256 /* size in entries of IDT */
505
506 /*
507 * Entries in the Global Descriptor Table (GDT)
508 *
509 * We make sure to space the system descriptors (LDT's, TSS')
510 * such that they are double gdt slot aligned. This is because
511 * in long mode system segment decriptors expand to 128 bits.
512 *
513 * GDT_LWPFS and GDT_LWPGS must be the same for both 32 and 64-bit
514 * kernels. See setup_context in libc. 64-bit processes must set
515 * %fs or %gs to null selector to use 64-bit fsbase or gsbase
516 * respectively.
517 */
518 #define GDT_NULL 0 /* null */
519 #define GDT_B32DATA 1 /* dboot 32 bit data descriptor */
520 #define GDT_B32CODE 2 /* dboot 32 bit code descriptor */
521 #define GDT_B16CODE 3 /* bios call 16 bit code descriptor */
522 #define GDT_B16DATA 4 /* bios call 16 bit data descriptor */
523 #define GDT_B64CODE 5 /* dboot 64 bit code descriptor */
524 #define GDT_BGSTMP 7 /* kmdb descriptor only used early in boot */
525
526 #if defined(__amd64)
527
528 #define GDT_KCODE 6 /* kernel code seg %cs */
529 #define GDT_KDATA 7 /* kernel data seg %ds */
530 #define GDT_U32CODE 8 /* 32-bit process on 64-bit kernel %cs */
531 #define GDT_UDATA 9 /* user data seg %ds (32 and 64 bit) */
532 #define GDT_UCODE 10 /* native user code seg %cs */
533 #define GDT_LDT 12 /* LDT for current process */
534 #define GDT_KTSS 14 /* kernel tss */
535 #define GDT_FS GDT_NULL /* kernel %fs segment selector */
536 #define GDT_GS GDT_NULL /* kernel %gs segment selector */
537 #define GDT_LWPFS 55 /* lwp private %fs segment selector (32-bit) */
538 #define GDT_LWPGS 56 /* lwp private %gs segment selector (32-bit) */
539 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */
540 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */
541 #define NGDT 62 /* number of entries in GDT */
542
543 /*
544 * This selector is only used in the temporary GDT used to bring additional
545 * CPUs from 16-bit real mode into long mode in real_mode_start().
546 */
547 #define TEMPGDT_KCODE64 1 /* 64-bit code selector */
548
549 #elif defined(__i386)
550
551 #define GDT_LDT 40 /* LDT for current process */
552 #define GDT_KTSS 42 /* kernel tss */
553 #define GDT_KCODE 43 /* kernel code seg %cs */
554 #define GDT_KDATA 44 /* kernel data seg %ds */
555 #define GDT_UCODE 45 /* native user code seg %cs */
556 #define GDT_UDATA 46 /* user data seg %ds (32 and 64 bit) */
557 #define GDT_DBFLT 47 /* double fault #DF selector */
558 #define GDT_FS 53 /* kernel %fs segment selector */
559 #define GDT_GS 54 /* kernel %gs segment selector */
560 #define GDT_LWPFS 55 /* lwp private %fs segment selector */
561 #define GDT_LWPGS 56 /* lwp private %gs segment selector */
562 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */
563 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */
564 #if !defined(__xpv)
565 #define NGDT 90 /* number of entries in GDT */
566 #else
567 #define NGDT 512 /* single 4K page for the hypervisor */
568 #endif
569
570 #endif /* __i386 */
571
572 /*
573 * Convenient selector definitions.
574 */
575
576 /*
577 * XXPV 64 bit Xen only allows the guest %cs/%ss be the private ones it
578 * provides, not the ones we create for ourselves. See FLAT_RING3_CS64 in
579 * public/arch-x86_64.h
580 *
581 * 64-bit Xen runs paravirtual guests in ring 3 but emulates them running in
582 * ring 0 by clearing CPL in %cs value pushed on guest exception stacks.
583 * Therefore we will have KCS_SEL value indicate ring 0 and use that everywhere
584 * in the kernel. But in the few files where we initialize segment registers or
585 * create and update descriptors we will explicity OR in SEL_KPL (ring 3) for
586 * kernel %cs. See desctbls.c for an example.
587 */
588
589 #if defined(__xpv) && defined(__amd64)
590 #define KCS_SEL 0xe030 /* FLAT_RING3_CS64 & 0xFFF0 */
591 #define KDS_SEL 0xe02b /* FLAT_RING3_SS64 */
592 #else
593 #define KCS_SEL SEL_GDT(GDT_KCODE, SEL_KPL)
594 #define KDS_SEL SEL_GDT(GDT_KDATA, SEL_KPL)
595 #endif
596
597 #define UCS_SEL SEL_GDT(GDT_UCODE, SEL_UPL)
598 #if defined(__amd64)
599 #define TEMP_CS64_SEL SEL_GDT(TEMPGDT_KCODE64, SEL_KPL)
600 #define U32CS_SEL SEL_GDT(GDT_U32CODE, SEL_UPL)
601 #endif
602
603 #define UDS_SEL SEL_GDT(GDT_UDATA, SEL_UPL)
604 #define ULDT_SEL SEL_GDT(GDT_LDT, SEL_KPL)
605 #define KTSS_SEL SEL_GDT(GDT_KTSS, SEL_KPL)
606 #define DFTSS_SEL SEL_GDT(GDT_DBFLT, SEL_KPL)
607 #define KFS_SEL 0
608 #define KGS_SEL SEL_GDT(GDT_GS, SEL_KPL)
609 #define LWPFS_SEL SEL_GDT(GDT_LWPFS, SEL_UPL)
610 #define LWPGS_SEL SEL_GDT(GDT_LWPGS, SEL_UPL)
611 #define BRANDMIN_SEL SEL_GDT(GDT_BRANDMIN, SEL_UPL)
612 #define BRANDMAX_SEL SEL_GDT(GDT_BRANDMAX, SEL_UPL)
613
614 #define B64CODE_SEL SEL_GDT(GDT_B64CODE, SEL_KPL)
615 #define B32CODE_SEL SEL_GDT(GDT_B32CODE, SEL_KPL)
616 #define B32DATA_SEL SEL_GDT(GDT_B32DATA, SEL_KPL)
617 #define B16CODE_SEL SEL_GDT(GDT_B16CODE, SEL_KPL)
618 #define B16DATA_SEL SEL_GDT(GDT_B16DATA, SEL_KPL)
619
620 /*
621 * Temporary %gs descriptor used by kmdb with -d option. Only lives
622 * in boot's GDT and is not copied into kernel's GDT from boot.
623 */
624 #define KMDBGS_SEL SEL_GDT(GDT_BGSTMP, SEL_KPL)
625
626 /*
627 * Selector used for kdi_idt when kmdb has taken over the IDT.
628 */
629 #if defined(__amd64)
630 #define KMDBCODE_SEL B64CODE_SEL
631 #else
632 #define KMDBCODE_SEL B32CODE_SEL
633 #endif
634
635 /*
636 * Entries in default Local Descriptor Table (LDT) for every process.
637 */
638 #define LDT_SYSCALL 0 /* call gate for libc.a (obsolete) */
639 #define LDT_SIGCALL 1 /* EOL me, call gate for static sigreturn */
640 #define LDT_RESVD1 2 /* old user %cs */
641 #define LDT_RESVD2 3 /* old user %ds */
642 #define LDT_ALTSYSCALL 4 /* alternate call gate for system calls */
643 #define LDT_ALTSIGCALL 5 /* EOL me, alternate call gate for sigreturn */
644 #define LDT_UDBASE 6 /* user descriptor base index */
645 #define MINNLDT 512 /* Current min solaris ldt size (1 4K page) */
646 #define MAXNLDT 8192 /* max solaris ldt size (16 4K pages) */
647
648 #ifndef _ASM
649
650 extern gate_desc_t *idt0;
651 extern desctbr_t idt0_default_reg;
652 extern user_desc_t *gdt0;
653
654 extern user_desc_t zero_udesc;
655 extern user_desc_t null_udesc;
656 extern system_desc_t null_sdesc;
657
658 #if defined(__amd64)
659 extern user_desc_t zero_u32desc;
660 #endif
661 #if defined(__amd64)
662 extern user_desc_t ucs_on;
663 extern user_desc_t ucs_off;
664 extern user_desc_t ucs32_on;
665 extern user_desc_t ucs32_off;
666 #endif /* __amd64 */
667
668 extern tss_t *ktss0;
669
670 #if defined(__i386)
671 extern tss_t *dftss0;
672 #endif /* __i386 */
673
674 extern void div0trap(), dbgtrap(), nmiint(), brktrap(), ovflotrap();
675 extern void boundstrap(), invoptrap(), ndptrap();
676 #if !defined(__xpv)
677 extern void syserrtrap();
678 #endif
679 extern void invaltrap(), invtsstrap(), segnptrap(), stktrap();
680 extern void gptrap(), pftrap(), ndperr();
681 extern void overrun(), resvtrap();
682 extern void _start(), cmnint();
683 extern void achktrap(), mcetrap();
684 extern void xmtrap();
685 extern void fasttrap();
686 extern void sys_int80();
687 extern void brand_sys_int80();
688 extern void dtrace_ret();
689
690 #if !defined(__amd64)
691 extern void pentium_pftrap();
692 #endif
693
694 #endif /* _ASM */
695
696 #ifdef __cplusplus
697 }
698 #endif
699
700 #endif /* _SYS_SEGMENTS_H */