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