1 /*
2 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
3 */
4 /*
5 * Copyright 2018 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 extern void __swapgs(void);
183 #endif /* __amd64 */
184
185 #if defined(__amd64)
186 extern void load_segment_registers(selector_t, selector_t, selector_t,
187 selector_t); /* (alphabetical) */
188 #elif defined(__i386)
189 extern void load_segment_registers(selector_t, selector_t, selector_t,
190 selector_t, selector_t, selector_t); /* (alphabetical) */
191 #endif /* __i386 */
192
193 selector_t get_cs_register();
194
195 #if !defined(__amd64)
196
197 /*
198 * User segment descriptors (code and data).
199 * Legacy mode 64-bits wide.
200 */
201 typedef struct user_desc {
202 uint32_t usd_lolimit:16; /* segment limit 15:0 */
203 uint32_t usd_lobase:16; /* segment base 15:0 */
204 uint32_t usd_midbase:8; /* segment base 23:16 */
205 uint32_t usd_type:5; /* segment type, includes S bit */
206 uint32_t usd_dpl:2; /* segment descriptor priority level */
207 uint32_t usd_p:1; /* segment descriptor present */
208 uint32_t usd_hilimit:4; /* segment limit 19:16 */
209 uint32_t usd_avl:1; /* available to sw, but not used */
210 uint32_t usd_reserved:1; /* unused, ignored */
211 uint32_t usd_def32:1; /* default 32 vs 16 bit operand */
212 uint32_t usd_gran:1; /* limit units (bytes vs pages) */
213 uint32_t usd_hibase:8; /* segment base 31:24 */
214 } user_desc_t;
215
216 #define USEGD_GETBASE(usd) ((usd)->usd_lobase | \
217 (usd)->usd_midbase << 16 | \
218 (usd)->usd_hibase << (16 + 8))
219
220 #define USEGD_SETBASE(usd, b) ((usd)->usd_lobase = (b), \
221 (usd)->usd_midbase = (b) >> 16, \
222 (usd)->usd_hibase = (b) >> (16 + 8))
223
224 #define USEGD_GETLIMIT(usd) ((usd)->usd_lolimit | \
225 (usd)->usd_hilimit << 16)
226
227 #define USEGD_SETLIMIT(usd, lim) ((usd)->usd_lolimit = lim, \
228 (usd)->usd_hilimit = lim >> 16)
229
230 #define USD_TYPESHIFT 5 /* size of usd_type field */
231
232 #else /* __amd64 */
233
234 /*
235 * User segment descriptors.
236 * Long mode 64-bits wide.
237 *
238 * In 32-bit compatibility mode (%cs:usd_long=0) all fields are interpreted
239 * as in legacy mode for both code and data.
240 *
241 * In 64-bit mode (%cs:usd_long=1) code segments only have the conforming
242 * bit in usd_type, usd_dpl, usd_p, usd_long and usd_def32=0. usd_def32
243 * must be zero in 64-bit mode. Setting it to 1 is reserved for future use.
244 * All other fields are loaded but ignored by hardware.
245 *
246 * 64-bit data segments only have usd_p. All other fields are loaded but
247 * ignored by hardware when in 64-bit mode.
248 */
249 typedef struct user_desc {
250 uint64_t usd_lolimit:16; /* segment limit 15:0 */
251 uint64_t usd_lobase:16; /* segment base 15:0 */
252 uint64_t usd_midbase:8; /* segment base 23:16 */
253 uint64_t usd_type:5; /* segment type, includes S bit */
254 uint64_t usd_dpl:2; /* segment descriptor priority level */
255 uint64_t usd_p:1; /* segment descriptor present */
256 uint64_t usd_hilimit:4; /* segment limit 19:16 */
257 uint64_t usd_avl:1; /* available to sw, but not used */
258 uint64_t usd_long:1; /* long mode (%cs only) */
259 uint64_t usd_def32:1; /* default 32 vs 16 bit operand */
260 uint64_t usd_gran:1; /* limit units (bytes vs page) */
261 uint64_t usd_hibase:8; /* segment base 31:24 */
262 } user_desc_t;
263
264 #define USEGD_GETBASE(usd) ((usd)->usd_lobase | \
265 (usd)->usd_midbase << 16 | \
266 (usd)->usd_hibase << (16 + 8))
267
268 #define USEGD_SETBASE(usd, b) ((usd)->usd_lobase = (b), \
269 (usd)->usd_midbase = (b) >> 16, \
270 (usd)->usd_hibase = (b) >> (16 + 8))
271
272 #define USEGD_GETLIMIT(usd) ((usd)->usd_lolimit | \
273 (usd)->usd_hilimit << 16)
274
275 #define USEGD_SETLIMIT(usd, lim) ((usd)->usd_lolimit = lim, \
276 (usd)->usd_hilimit = lim >> 16)
277
278 #define USD_TYPESHIFT 5 /* size of usd_type field */
279
280 #endif /* __amd64 */
281
282 #if !defined(__amd64)
283
284 /*
285 * System segment descriptors for LDT and TSS segments.
286 * Legacy mode 64-bits wide.
287 */
288 typedef struct system_desc {
289 uint32_t ssd_lolimit:16; /* segment limit 15:0 */
290 uint32_t ssd_lobase:16; /* segment base 15:0 */
291 uint32_t ssd_midbase:8; /* segment base 23:16 */
292 uint32_t ssd_type:4; /* segment type */
293 uint32_t ssd_zero:1; /* must be zero */
294 uint32_t ssd_dpl:2; /* segment descriptor priority level */
295 uint32_t ssd_p:1; /* segment descriptor present */
296 uint32_t ssd_hilimit:4; /* segment limit 19:16 */
297 uint32_t ssd_avl:1; /* available to sw, but not used */
298 uint32_t ssd_reserved:2; /* unused, ignored */
299 uint32_t ssd_gran:1; /* limit unit (bytes vs pages) */
300 uint32_t ssd_hibase:8; /* segment base 31:24 */
301 } system_desc_t;
302
303 #else /* __amd64 */
304
305 /*
306 * System segment descriptors for LDT and TSS segments.
307 * Long mode 128-bits wide.
308 *
309 * 32-bit LDT and TSS descriptor types are redefined to 64-bit equivalents.
310 * All other legacy types are reserved and illegal.
311 */
312 typedef struct system_desc {
313 uint64_t ssd_lolimit:16; /* segment limit 15:0 */
314 uint64_t ssd_lobase:16; /* segment base 15:0 */
315 uint64_t ssd_midbase:8; /* segment base 23:16 */
316 uint64_t ssd_type:4; /* segment type */
317 uint64_t ssd_zero1:1; /* must be zero */
318 uint64_t ssd_dpl:2; /* segment descriptor priority level */
319 uint64_t ssd_p:1; /* segment descriptor present */
320 uint64_t ssd_hilimit:4; /* segment limit 19:16 */
321 uint64_t ssd_avl:1; /* available to sw, but not used */
322 uint64_t ssd_resv1:2; /* unused, ignored */
323 uint64_t ssd_gran:1; /* limit unit (bytes vs pages) */
324 uint64_t ssd_hibase:8; /* segment base 31:24 */
325 uint64_t ssd_hi64base:32; /* segment base 63:32 */
326 uint64_t ssd_resv2:8; /* unused, ignored */
327 uint64_t ssd_zero2:5; /* must be zero */
328 uint64_t ssd_resv3:19; /* unused, ignored */
329 } system_desc_t;
330
331 #endif /* __amd64 */
332
333 #define SYSSEGD_SETLIMIT(ssd, lim) ((ssd)->ssd_lolimit = lim, \
334 (ssd)->ssd_hilimit = lim >> 16)
335
336 #define SYSSEGD_GETLIMIT(ssd) (((ssd)->ssd_hilimit << 16) | \
337 (ssd)->ssd_lolimit)
338
339 #if !defined(__amd64)
340
341 /*
342 * System gate segment descriptors for interrupt, trap, call and task gates.
343 * Legacy mode 64-bits wide.
344 */
345 typedef struct gate_desc {
346 uint32_t sgd_looffset:16; /* segment code offset 15:0 */
347 uint32_t sgd_selector:16; /* target code or task selector */
348 uint32_t sgd_stkcpy:5; /* number of stack wds to cpy */
349 uint32_t sgd_resv:3; /* unused, ignored */
350 uint32_t sgd_type:5; /* segment type, includes S bit */
351 uint32_t sgd_dpl:2; /* segment descriptor priority level */
352 uint32_t sgd_p:1; /* segment descriptor present */
353 uint32_t sgd_hioffset:16; /* code seg off 31:16 */
354 } gate_desc_t;
355
356 #define GATESEG_GETOFFSET(sgd) ((uintptr_t)((sgd)->sgd_looffset | \
357 (sgd)->sgd_hioffset << 16))
358
359 #else /* __amd64 */
360
361 /*
362 * System segment descriptors for interrupt, trap and call gates.
363 * Long mode 128-bits wide.
364 *
365 * 32-bit interrupt, trap and call gate types are redefined to 64-bit
366 * equivalents. Task gates along with all other legacy types are reserved
367 * and illegal.
368 */
369 typedef struct gate_desc {
370 uint64_t sgd_looffset:16; /* segment code offset 15:0 */
371 uint64_t sgd_selector:16; /* target code or task selector */
372 uint64_t sgd_ist:3; /* IST table index */
373 uint64_t sgd_resv1:5; /* unused, ignored */
374 uint64_t sgd_type:5; /* segment type, includes S bit */
375 uint64_t sgd_dpl:2; /* segment descriptor priority level */
376 uint64_t sgd_p:1; /* segment descriptor present */
377 uint64_t sgd_hioffset:16; /* segment code offset 31:16 */
378 uint64_t sgd_hi64offset:32; /* segment code offset 63:32 */
379 uint64_t sgd_resv2:8; /* unused, ignored */
380 uint64_t sgd_zero:5; /* call gate only: must be zero */
381 uint64_t sgd_resv3:19; /* unused, ignored */
382 } gate_desc_t;
383
384 #define GATESEG_GETOFFSET(sgd) ((uintptr_t)((sgd)->sgd_looffset | \
385 (sgd)->sgd_hioffset << 16 | \
386 (uint64_t)((sgd)->sgd_hi64offset) << 32))
387
388 #endif /* __amd64 */
389
390 /*
391 * functions for initializing and updating segment descriptors.
392 */
393 #if defined(__amd64)
394
395 extern void set_usegd(user_desc_t *, uint_t, void *, size_t, uint_t, uint_t,
396 uint_t, uint_t);
397
398 #elif defined(__i386)
399
400 extern void set_usegd(user_desc_t *, void *, size_t, uint_t, uint_t,
401 uint_t, uint_t);
402
403 #endif /* __i386 */
404
405 extern uint_t idt_vector_to_ist(uint_t);
406
407 extern void set_gatesegd(gate_desc_t *, void (*)(void), selector_t,
408 uint_t, uint_t, uint_t);
409
410 extern void set_syssegd(system_desc_t *, void *, size_t, uint_t, uint_t);
411
412 extern void *get_ssd_base(system_desc_t *);
413
414 extern void gdt_update_usegd(uint_t, user_desc_t *);
415
416 extern int ldt_update_segd(user_desc_t *, user_desc_t *);
417
418 #if defined(__xpv)
419
420 extern int xen_idt_to_trap_info(uint_t, gate_desc_t *, void *);
421 extern void xen_idt_write(gate_desc_t *, uint_t);
422
423 #endif /* __xen */
424
425 void init_boot_gdt(user_desc_t *);
426
427 #endif /* _ASM */
428
429 /*
430 * Common segment parameter defintions for granularity, default
431 * operand size and operaton mode.
432 */
433 #define SDP_BYTES 0 /* segment limit scaled to bytes */
434 #define SDP_PAGES 1 /* segment limit scaled to pages */
435 #define SDP_OP32 1 /* code and data default operand = 32 bits */
436 #define SDP_LONG 1 /* long mode code segment (64 bits) */
437 #define SDP_SHORT 0 /* compat/legacy code segment (32 bits) */
438 /*
439 * System segments and gate types.
440 *
441 * In long mode i386 32-bit ldt, tss, call, interrupt and trap gate
442 * types are redefined into 64-bit equivalents.
443 */
444 #define SDT_SYSNULL 0 /* system null */
445 #define SDT_SYS286TSS 1 /* system 286 TSS available */
446 #define SDT_SYSLDT 2 /* system local descriptor table */
447 #define SDT_SYS286BSY 3 /* system 286 TSS busy */
448 #define SDT_SYS286CGT 4 /* system 286 call gate */
449 #define SDT_SYSTASKGT 5 /* system task gate */
450 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */
451 #define SDT_SYS286TGT 7 /* system 286 trap gate */
452 #define SDT_SYSNULL2 8 /* system null again */
453 #define SDT_SYSTSS 9 /* system TSS available */
454 #define SDT_SYSNULL3 10 /* system null again */
455 #define SDT_SYSTSSBSY 11 /* system TSS busy */
456 #define SDT_SYSCGT 12 /* system call gate */
457 #define SDT_SYSNULL4 13 /* system null again */
458 #define SDT_SYSIGT 14 /* system interrupt gate */
459 #define SDT_SYSTGT 15 /* system trap gate */
460
461 /*
462 * Memory segment types.
463 *
464 * While in long mode expand-down, writable and accessed type field
465 * attributes are ignored. Only the conforming bit is loaded by hardware
466 * for long mode code segment descriptors.
467 */
468 #define SDT_MEMRO 16 /* read only */
469 #define SDT_MEMROA 17 /* read only accessed */
470 #define SDT_MEMRW 18 /* read write */
471 #define SDT_MEMRWA 19 /* read write accessed */
472 #define SDT_MEMROD 20 /* read only expand dwn limit */
473 #define SDT_MEMRODA 21 /* read only expand dwn limit accessed */
474 #define SDT_MEMRWD 22 /* read write expand dwn limit */
475 #define SDT_MEMRWDA 23 /* read write expand dwn limit accessed */
476 #define SDT_MEME 24 /* execute only */
477 #define SDT_MEMEA 25 /* execute only accessed */
478 #define SDT_MEMER 26 /* execute read */
479 #define SDT_MEMERA 27 /* execute read accessed */
480 #define SDT_MEMEC 28 /* execute only conforming */
481 #define SDT_MEMEAC 29 /* execute only accessed conforming */
482 #define SDT_MEMERC 30 /* execute read conforming */
483 #define SDT_MEMERAC 31 /* execute read accessed conforming */
484
485 /* These bits are within the "type" field, like the values above. */
486 #define SDT_A 0x01 /* accessed bit */
487 #define SDT_S 0x10 /* S-bit at the top of "type" for usegs */
488
489 /*
490 * Entries in the Interrupt Descriptor Table (IDT)
491 */
492 #define IDT_DE 0 /* #DE: Divide Error */
493 #define IDT_DB 1 /* #DB: Debug */
494 #define IDT_NMI 2 /* Nonmaskable External Interrupt */
495 #define IDT_BP 3 /* #BP: Breakpoint */
496 #define IDT_OF 4 /* #OF: Overflow */
497 #define IDT_BR 5 /* #BR: Bound Range Exceeded */
498 #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */
499 #define IDT_NM 7 /* #NM: No Math Coprocessor */
500 #define IDT_DF 8 /* #DF: Double Fault */
501 #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */
502 #define IDT_TS 10 /* #TS: Invalid TSS */
503 #define IDT_NP 11 /* #NP: Segment Not Present */
504 #define IDT_SS 12 /* #SS: Stack Segment Fault */
505 #define IDT_GP 13 /* #GP: General Protection Fault */
506 #define IDT_PF 14 /* #PF: Page Fault */
507 #define IDT_MF 16 /* #MF: FPU Floating-Point Error */
508 #define IDT_AC 17 /* #AC: Alignment Check */
509 #define IDT_MC 18 /* #MC: Machine Check */
510 #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */
511 #define NIDT 256 /* size in entries of IDT */
512
513 /*
514 * Entries in the Global Descriptor Table (GDT)
515 *
516 * We make sure to space the system descriptors (LDT's, TSS')
517 * such that they are double gdt slot aligned. This is because
518 * in long mode system segment decriptors expand to 128 bits.
519 *
520 * GDT_LWPFS and GDT_LWPGS must be the same for both 32 and 64-bit
521 * kernels. See setup_context in libc. 64-bit processes must set
522 * %fs or %gs to null selector to use 64-bit fsbase or gsbase
523 * respectively.
524 */
525 #define GDT_NULL 0 /* null */
526 #define GDT_B32DATA 1 /* dboot 32 bit data descriptor */
527 #define GDT_B32CODE 2 /* dboot 32 bit code descriptor */
528 #define GDT_B16CODE 3 /* bios call 16 bit code descriptor */
529 #define GDT_B16DATA 4 /* bios call 16 bit data descriptor */
530 #define GDT_B64CODE 5 /* dboot 64 bit code descriptor */
531 #define GDT_BGSTMP 7 /* kmdb descriptor only used early in boot */
532 #define GDT_CPUID 16 /* store numeric id of current CPU */
533
534 #if defined(__amd64)
535
536 #define GDT_KCODE 6 /* kernel code seg %cs */
537 #define GDT_KDATA 7 /* kernel data seg %ds */
538 #define GDT_U32CODE 8 /* 32-bit process on 64-bit kernel %cs */
539 #define GDT_UDATA 9 /* user data seg %ds (32 and 64 bit) */
540 #define GDT_UCODE 10 /* native user code seg %cs */
541 #define GDT_LDT 12 /* (12-13) LDT for current process */
542 #define GDT_KTSS 14 /* (14-15) kernel tss */
543 #define GDT_FS GDT_NULL /* kernel %fs segment selector */
544 #define GDT_GS GDT_NULL /* kernel %gs segment selector */
545 #define GDT_LWPFS 55 /* lwp private %fs segment selector (32-bit) */
546 #define GDT_LWPGS 56 /* lwp private %gs segment selector (32-bit) */
547 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */
548 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */
549 #define NGDT 62 /* number of entries in GDT */
550
551 /*
552 * This selector is only used in the temporary GDT used to bring additional
553 * CPUs from 16-bit real mode into long mode in real_mode_start().
554 */
555 #define TEMPGDT_KCODE64 1 /* 64-bit code selector */
556
557 #elif defined(__i386)
558
559 #define GDT_LDT 40 /* LDT for current process */
560 #define GDT_KTSS 42 /* kernel tss */
561 #define GDT_KCODE 43 /* kernel code seg %cs */
562 #define GDT_KDATA 44 /* kernel data seg %ds */
563 #define GDT_UCODE 45 /* native user code seg %cs */
564 #define GDT_UDATA 46 /* user data seg %ds (32 and 64 bit) */
565 #define GDT_DBFLT 47 /* double fault #DF selector */
566 #define GDT_FS 53 /* kernel %fs segment selector */
567 #define GDT_GS 54 /* kernel %gs segment selector */
568 #define GDT_LWPFS 55 /* lwp private %fs segment selector */
569 #define GDT_LWPGS 56 /* lwp private %gs segment selector */
570 #define GDT_BRANDMIN 57 /* first entry in GDT for brand usage */
571 #define GDT_BRANDMAX 61 /* last entry in GDT for brand usage */
572 #if !defined(__xpv)
573 #define NGDT 90 /* number of entries in GDT */
574 #else
575 #define NGDT 512 /* single 4K page for the hypervisor */
576 #endif
577
578 #endif /* __i386 */
579
580 /*
581 * Convenient selector definitions.
582 */
583
584 /*
585 * XXPV 64 bit Xen only allows the guest %cs/%ss be the private ones it
586 * provides, not the ones we create for ourselves. See FLAT_RING3_CS64 in
587 * public/arch-x86_64.h
588 *
589 * 64-bit Xen runs paravirtual guests in ring 3 but emulates them running in
590 * ring 0 by clearing CPL in %cs value pushed on guest exception stacks.
591 * Therefore we will have KCS_SEL value indicate ring 0 and use that everywhere
592 * in the kernel. But in the few files where we initialize segment registers or
593 * create and update descriptors we will explicity OR in SEL_KPL (ring 3) for
594 * kernel %cs. See desctbls.c for an example.
595 */
596
597 #if defined(__xpv) && defined(__amd64)
598 #define KCS_SEL 0xe030 /* FLAT_RING3_CS64 & 0xFFF0 */
599 #define KDS_SEL 0xe02b /* FLAT_RING3_SS64 */
600 #else
601 #define KCS_SEL SEL_GDT(GDT_KCODE, SEL_KPL)
602 #define KDS_SEL SEL_GDT(GDT_KDATA, SEL_KPL)
603 #endif
604
605 #define UCS_SEL SEL_GDT(GDT_UCODE, SEL_UPL)
606 #if defined(__amd64)
607 #define TEMP_CS64_SEL SEL_GDT(TEMPGDT_KCODE64, SEL_KPL)
608 #define U32CS_SEL SEL_GDT(GDT_U32CODE, SEL_UPL)
609 #endif
610
611 #define UDS_SEL SEL_GDT(GDT_UDATA, SEL_UPL)
612 #define ULDT_SEL SEL_GDT(GDT_LDT, SEL_KPL)
613 #define KTSS_SEL SEL_GDT(GDT_KTSS, SEL_KPL)
614 #define DFTSS_SEL SEL_GDT(GDT_DBFLT, SEL_KPL)
615 #define KFS_SEL 0
616 #define KGS_SEL SEL_GDT(GDT_GS, SEL_KPL)
617 #define LWPFS_SEL SEL_GDT(GDT_LWPFS, SEL_UPL)
618 #define LWPGS_SEL SEL_GDT(GDT_LWPGS, SEL_UPL)
619 #define BRANDMIN_SEL SEL_GDT(GDT_BRANDMIN, SEL_UPL)
620 #define BRANDMAX_SEL SEL_GDT(GDT_BRANDMAX, SEL_UPL)
621
622 #define B64CODE_SEL SEL_GDT(GDT_B64CODE, SEL_KPL)
623 #define B32CODE_SEL SEL_GDT(GDT_B32CODE, SEL_KPL)
624 #define B32DATA_SEL SEL_GDT(GDT_B32DATA, SEL_KPL)
625 #define B16CODE_SEL SEL_GDT(GDT_B16CODE, SEL_KPL)
626 #define B16DATA_SEL SEL_GDT(GDT_B16DATA, SEL_KPL)
627
628 /*
629 * Temporary %gs descriptor used by kmdb with -d option. Only lives
630 * in boot's GDT and is not copied into kernel's GDT from boot.
631 */
632 #define KMDBGS_SEL SEL_GDT(GDT_BGSTMP, SEL_KPL)
633
634 /*
635 * Selector used for kdi_idt when kmdb has taken over the IDT.
636 */
637 #if defined(__amd64)
638 #define KMDBCODE_SEL B64CODE_SEL
639 #else
640 #define KMDBCODE_SEL B32CODE_SEL
641 #endif
642
643 /*
644 * Entries in default Local Descriptor Table (LDT) for every process.
645 */
646 #define LDT_SYSCALL 0 /* call gate for libc.a (obsolete) */
647 #define LDT_SIGCALL 1 /* EOL me, call gate for static sigreturn */
648 #define LDT_RESVD1 2 /* old user %cs */
649 #define LDT_RESVD2 3 /* old user %ds */
650 #define LDT_ALTSYSCALL 4 /* alternate call gate for system calls */
651 #define LDT_ALTSIGCALL 5 /* EOL me, alternate call gate for sigreturn */
652 #define LDT_UDBASE 6 /* user descriptor base index */
653 #define MINNLDT 512 /* Current min solaris ldt size (1 4K page) */
654 #define MAXNLDT 8192 /* max solaris ldt size (16 4K pages) */
655
656 #ifdef _KERNEL
657 #define LDT_CPU_SIZE (16 * 4096) /* Size of kernel per-CPU allocation */
658 #endif
659
660 #ifndef _ASM
661
662 extern gate_desc_t *idt0;
663 extern desctbr_t idt0_default_reg;
664 extern user_desc_t *gdt0;
665
666 extern user_desc_t zero_udesc;
667 extern user_desc_t null_udesc;
668 extern system_desc_t null_sdesc;
669
670 #if defined(__amd64)
671 extern user_desc_t zero_u32desc;
672 #endif
673 #if defined(__amd64)
674 extern user_desc_t ucs_on;
675 extern user_desc_t ucs_off;
676 extern user_desc_t ucs32_on;
677 extern user_desc_t ucs32_off;
678 #endif /* __amd64 */
679
680 extern tss_t *ktss0;
681
682 #if defined(__i386)
683 extern tss_t *dftss0;
684 #endif /* __i386 */
685
686 extern void div0trap(), dbgtrap(), nmiint(), brktrap(), ovflotrap();
687 extern void boundstrap(), invoptrap(), ndptrap();
688 #if !defined(__xpv)
689 extern void syserrtrap();
690 #endif
691 extern void invaltrap(), invtsstrap(), segnptrap(), stktrap();
692 extern void gptrap(), pftrap(), ndperr();
693 extern void overrun(), resvtrap();
694 extern void _start(), cmnint();
695 extern void achktrap(), mcetrap();
696 extern void xmtrap();
697 extern void fasttrap();
698 extern void dtrace_ret();
699
700 /* KPTI trampolines */
701 extern void tr_invaltrap();
702 extern void tr_div0trap(), tr_dbgtrap(), tr_nmiint(), tr_brktrap();
703 extern void tr_ovflotrap(), tr_boundstrap(), tr_invoptrap(), tr_ndptrap();
704 #if !defined(__xpv)
705 extern void tr_syserrtrap();
706 #endif
707 extern void tr_invaltrap(), tr_invtsstrap(), tr_segnptrap(), tr_stktrap();
708 extern void tr_gptrap(), tr_pftrap(), tr_ndperr();
709 extern void tr_overrun(), tr_resvtrap();
710 extern void tr_achktrap(), tr_mcetrap();
711 extern void tr_xmtrap();
712 extern void tr_fasttrap();
713 extern void tr_dtrace_ret();
714
715 #if !defined(__amd64)
716 extern void pentium_pftrap();
717 #endif
718
719 extern uint64_t kpti_enable;
720
721 #endif /* _ASM */
722
723 #ifdef __cplusplus
724 }
725 #endif
726
727 #endif /* _SYS_SEGMENTS_H */