1 | /* $NetBSD: segments.h,v 1.28 2016/09/02 08:52:12 maxv Exp $ */ |
2 | |
3 | /*- |
4 | * Copyright (c) 1990 The Regents of the University of California. |
5 | * All rights reserved. |
6 | * |
7 | * This code is derived from software contributed to Berkeley by |
8 | * William Jolitz. |
9 | * |
10 | * Redistribution and use in source and binary forms, with or without |
11 | * modification, are permitted provided that the following conditions |
12 | * are met: |
13 | * 1. Redistributions of source code must retain the above copyright |
14 | * notice, this list of conditions and the following disclaimer. |
15 | * 2. Redistributions in binary form must reproduce the above copyright |
16 | * notice, this list of conditions and the following disclaimer in the |
17 | * documentation and/or other materials provided with the distribution. |
18 | * 3. Neither the name of the University nor the names of its contributors |
19 | * may be used to endorse or promote products derived from this software |
20 | * without specific prior written permission. |
21 | * |
22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
32 | * SUCH DAMAGE. |
33 | * |
34 | * @(#)segments.h 7.1 (Berkeley) 5/9/91 |
35 | */ |
36 | |
37 | /*- |
38 | * Copyright (c) 1995, 1997 |
39 | * Charles M. Hannum. All rights reserved. |
40 | * Copyright (c) 1989, 1990 William F. Jolitz |
41 | * |
42 | * This code is derived from software contributed to Berkeley by |
43 | * William Jolitz. |
44 | * |
45 | * Redistribution and use in source and binary forms, with or without |
46 | * modification, are permitted provided that the following conditions |
47 | * are met: |
48 | * 1. Redistributions of source code must retain the above copyright |
49 | * notice, this list of conditions and the following disclaimer. |
50 | * 2. Redistributions in binary form must reproduce the above copyright |
51 | * notice, this list of conditions and the following disclaimer in the |
52 | * documentation and/or other materials provided with the distribution. |
53 | * 3. All advertising materials mentioning features or use of this software |
54 | * must display the following acknowledgement: |
55 | * This product includes software developed by the University of |
56 | * California, Berkeley and its contributors. |
57 | * 4. Neither the name of the University nor the names of its contributors |
58 | * may be used to endorse or promote products derived from this software |
59 | * without specific prior written permission. |
60 | * |
61 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
62 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
63 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
64 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
65 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
66 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
67 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
68 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
69 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
70 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
71 | * SUCH DAMAGE. |
72 | * |
73 | * @(#)segments.h 7.1 (Berkeley) 5/9/91 |
74 | */ |
75 | |
76 | /* |
77 | * Adapted for NetBSD/amd64 by fvdl@wasabisystems.com. |
78 | */ |
79 | |
80 | /* |
81 | * 386 Segmentation Data Structures and definitions |
82 | * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989 |
83 | */ |
84 | |
85 | #ifndef _AMD64_SEGMENTS_H_ |
86 | #define _AMD64_SEGMENTS_H_ |
87 | |
88 | #ifdef __x86_64__ |
89 | |
90 | #ifdef _KERNEL_OPT |
91 | #include "opt_xen.h" |
92 | #endif |
93 | |
94 | /* |
95 | * Selectors |
96 | */ |
97 | |
98 | #define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */ |
99 | #ifdef XEN |
100 | #define SEL_KPL 3 /* kernel privilege level */ |
101 | #define SEL_XPL 0 /* Xen Hypervisor privilege level */ |
102 | #else |
103 | #define SEL_KPL 0 /* kernel privilege level */ |
104 | #endif |
105 | #define SEL_UPL 3 /* user privilege level */ |
106 | #define SEL_RPL 3 /* requester's privilege level mask */ |
107 | #define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */ |
108 | #define SEL_LDT 4 /* local descriptor table */ |
109 | |
110 | /* Dynamically allocated TSSs and LDTs start (byte offset) */ |
111 | #define SYSSEL_START (NGDT_MEM << 3) |
112 | #define DYNSEL_START (SYSSEL_START + (NGDT_SYS << 4)) |
113 | |
114 | /* |
115 | * These define the index not from the start of the GDT, but from |
116 | * the part of the GDT that they're allocated from. |
117 | * First NGDT_MEM entries are 8-byte descriptors for CS and DS. |
118 | * Next NGDT_SYS entries are 16-byte descriptors defining LDTs. |
119 | * |
120 | * The rest is 16-byte descriptors for TSS and LDT. |
121 | */ |
122 | |
123 | #define IDXSEL(s) (((s) >> 3) & 0x1fff) |
124 | #define IDXDYNSEL(s) ((((s) & ~SEL_RPL) - DYNSEL_START) >> 4) |
125 | |
126 | #define GSEL(s,r) (((s) << 3) | r) |
127 | #define GSYSSEL(s,r) ((((s) << 4) + SYSSEL_START) | r) |
128 | #define GDYNSEL(s,r) ((((s) << 4) + DYNSEL_START) | r | SEL_KPL) |
129 | |
130 | #define LSEL(s,r) ((s) | r | SEL_LDT) |
131 | |
132 | #define USERMODE(c, f) (ISPL(c) == SEL_UPL) |
133 | #ifdef XEN |
134 | /* |
135 | * As KPL == UPL, Xen emulate interrupt in kernel context by pushing |
136 | * a fake CS with XPL privilege |
137 | */ |
138 | #define KERNELMODE(c, f) (ISPL(c) == SEL_XPL) |
139 | #else |
140 | #define KERNELMODE(c, f) (ISPL(c) == SEL_KPL) |
141 | #endif |
142 | |
143 | #ifndef _LOCORE |
144 | |
145 | /* |
146 | * Memory and System segment descriptors |
147 | */ |
148 | |
149 | /* |
150 | * System segment descriptor (16 bytes): used for TSS and LDT. |
151 | */ |
152 | struct sys_segment_descriptor { |
153 | uint64_t sd_lolimit:16; /* segment extent (lsb) */ |
154 | uint64_t sd_lobase:24; /* segment base address (lsb) */ |
155 | uint64_t sd_type:5; /* segment type */ |
156 | uint64_t sd_dpl:2; /* segment descriptor priority level */ |
157 | uint64_t sd_p:1; /* segment descriptor present */ |
158 | uint64_t sd_hilimit:4; /* segment extent (msb) */ |
159 | uint64_t sd_xx1:3; /* avl, long and def32 (not used) */ |
160 | uint64_t sd_gran:1; /* limit granularity (byte/page) */ |
161 | uint64_t sd_hibase:40; /* segment base address (msb) */ |
162 | uint64_t sd_xx2:8; /* reserved */ |
163 | uint64_t sd_zero:5; /* must be zero */ |
164 | uint64_t sd_xx3:19; /* reserved */ |
165 | } __packed; |
166 | |
167 | /* |
168 | * Memory segment descriptor (8 bytes): used for cs, ds, etc. |
169 | */ |
170 | struct mem_segment_descriptor { |
171 | unsigned sd_lolimit:16; /* segment extent (lsb) */ |
172 | unsigned sd_lobase:24; /* segment base address (lsb) */ |
173 | unsigned sd_type:5; /* segment type */ |
174 | unsigned sd_dpl:2; /* segment descriptor priority level */ |
175 | unsigned sd_p:1; /* segment descriptor present */ |
176 | unsigned sd_hilimit:4; /* segment extent (msb) */ |
177 | unsigned sd_avl:1; /* available */ |
178 | unsigned sd_long:1; /* long mode */ |
179 | unsigned sd_def32:1; /* default 32 vs 16 bit size */ |
180 | unsigned sd_gran:1; /* limit granularity (byte/page) */ |
181 | unsigned sd_hibase:8; /* segment base address (msb) */ |
182 | } __packed; |
183 | |
184 | /* |
185 | * Common part of the above structures. Used to walk descriptor tables. |
186 | */ |
187 | struct common_segment_descriptor { |
188 | unsigned sdc_lolimit:16; |
189 | unsigned sdc_lobase:24; |
190 | unsigned sdc_type:5; |
191 | unsigned sdc_other:19; |
192 | } __packed; |
193 | |
194 | /* |
195 | * Gate descriptors (16 bytes). |
196 | */ |
197 | struct gate_descriptor { |
198 | uint64_t gd_looffset:16;/* gate offset (lsb) */ |
199 | uint64_t gd_selector:16;/* gate segment selector */ |
200 | uint64_t gd_ist:3; /* IST select */ |
201 | uint64_t gd_xx1:5; /* reserved */ |
202 | uint64_t gd_type:5; /* segment type */ |
203 | uint64_t gd_dpl:2; /* segment descriptor priority level */ |
204 | uint64_t gd_p:1; /* segment descriptor present */ |
205 | uint64_t gd_hioffset:48;/* gate offset (msb) */ |
206 | uint64_t gd_xx2:8; /* reserved */ |
207 | uint64_t gd_zero:5; /* must be zero */ |
208 | uint64_t gd_xx3:19; /* reserved */ |
209 | } __packed; |
210 | |
211 | /* |
212 | * Generic descriptor (8 bytes). Note: it does not include system segment |
213 | * descriptors and gate descriptors, since these are 16-byte-long. |
214 | */ |
215 | union descriptor { |
216 | struct mem_segment_descriptor sd; |
217 | uint32_t raw[2]; |
218 | uint64_t raw64; |
219 | } __packed; |
220 | |
221 | /* |
222 | * Region descriptors, used to load gdt/idt tables before segments yet exist. |
223 | */ |
224 | struct region_descriptor { |
225 | uint16_t rd_limit; /* segment extent */ |
226 | uint64_t rd_base; /* base address */ |
227 | } __packed; |
228 | |
229 | #ifdef _KERNEL |
230 | #ifdef XEN |
231 | extern struct trap_info *idt; |
232 | #else |
233 | extern struct gate_descriptor *idt; |
234 | #endif |
235 | extern char *gdtstore; |
236 | extern char *ldtstore; |
237 | |
238 | void setgate(struct gate_descriptor *, void *, int, int, int, int); |
239 | void unsetgate(struct gate_descriptor *); |
240 | void setregion(struct region_descriptor *, void *, uint16_t); |
241 | void set_sys_segment(struct sys_segment_descriptor *, void *, size_t, |
242 | int, int, int); |
243 | void set_mem_segment(struct mem_segment_descriptor *, void *, size_t, |
244 | int, int, int, int, int); |
245 | void cpu_init_idt(void); |
246 | void update_descriptor(void *, void *); |
247 | |
248 | #if !defined(XEN) |
249 | void idt_vec_reserve(int); |
250 | int idt_vec_alloc(int, int); |
251 | void idt_vec_set(int, void (*)(void)); |
252 | void idt_vec_free(int); |
253 | #endif |
254 | |
255 | struct lwp; |
256 | void cpu_fsgs_zero(struct lwp *); |
257 | void cpu_fsgs_reload(struct lwp *, int, int); |
258 | |
259 | #endif /* _KERNEL */ |
260 | |
261 | #endif /* !_LOCORE */ |
262 | |
263 | /* system segments and gate types */ |
264 | #define SDT_SYSNULL 0 /* system null */ |
265 | #define SDT_SYS286TSS 1 /* system 286 TSS available */ |
266 | #define SDT_SYSLDT 2 /* system local descriptor table */ |
267 | #define SDT_SYS286BSY 3 /* system 286 TSS busy */ |
268 | #define SDT_SYS286CGT 4 /* system 286 call gate */ |
269 | #define SDT_SYSTASKGT 5 /* system task gate */ |
270 | #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ |
271 | #define SDT_SYS286TGT 7 /* system 286 trap gate */ |
272 | #define SDT_SYSNULL2 8 /* system null again */ |
273 | #define SDT_SYS386TSS 9 /* system 386 TSS available */ |
274 | #define SDT_SYSNULL3 10 /* system null again */ |
275 | #define SDT_SYS386BSY 11 /* system 386 TSS busy */ |
276 | #define SDT_SYS386CGT 12 /* system 386 call gate */ |
277 | #define SDT_SYSNULL4 13 /* system null again */ |
278 | #define SDT_SYS386IGT 14 /* system 386 interrupt gate */ |
279 | #define SDT_SYS386TGT 15 /* system 386 trap gate */ |
280 | |
281 | /* memory segment types */ |
282 | #define SDT_MEMRO 16 /* memory read only */ |
283 | #define SDT_MEMROA 17 /* memory read only accessed */ |
284 | #define SDT_MEMRW 18 /* memory read write */ |
285 | #define SDT_MEMRWA 19 /* memory read write accessed */ |
286 | #define SDT_MEMROD 20 /* memory read only expand dwn limit */ |
287 | #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ |
288 | #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ |
289 | #define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */ |
290 | #define SDT_MEME 24 /* memory execute only */ |
291 | #define SDT_MEMEA 25 /* memory execute only accessed */ |
292 | #define SDT_MEMER 26 /* memory execute read */ |
293 | #define SDT_MEMERA 27 /* memory execute read accessed */ |
294 | #define SDT_MEMEC 28 /* memory execute only conforming */ |
295 | #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ |
296 | #define SDT_MEMERC 30 /* memory execute read conforming */ |
297 | #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ |
298 | |
299 | /* is memory segment descriptor pointer ? */ |
300 | #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && \ |
301 | (s->d_type) <= SDT_MEMERAC) |
302 | |
303 | /* is 286 gate descriptor pointer ? */ |
304 | #define IS286GDP(s) ((s->d_type) >= SDT_SYS286CGT && \ |
305 | (s->d_type) < SDT_SYS286TGT) |
306 | |
307 | /* is 386 gate descriptor pointer ? */ |
308 | #define IS386GDP(s) ((s->d_type) >= SDT_SYS386CGT && \ |
309 | (s->d_type) < SDT_SYS386TGT) |
310 | |
311 | /* is gate descriptor pointer ? */ |
312 | #define ISGDP(s) (IS286GDP(s) || IS386GDP(s)) |
313 | |
314 | /* is segment descriptor pointer ? */ |
315 | #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s)) |
316 | |
317 | /* is system segment descriptor pointer ? */ |
318 | #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s)) |
319 | |
320 | /* |
321 | * Segment Protection Exception code bits |
322 | */ |
323 | #define SEGEX_EXT 0x01 /* recursive or externally induced */ |
324 | #define SEGEX_IDT 0x02 /* interrupt descriptor table */ |
325 | #define SEGEX_TI 0x04 /* local descriptor table */ |
326 | |
327 | /* |
328 | * Entries in the Interrupt Descriptor Table (IDT) |
329 | */ |
330 | #define NIDT 256 |
331 | #define NCPUIDT 32 /* reserved entries for CPU exceptions */ |
332 | |
333 | /* |
334 | * Entries in the Global Descriptor Table (GDT) |
335 | * The code and data descriptors must come first. There |
336 | * are NGDT_MEM of them. |
337 | * |
338 | * Then come the predefined LDT (and possibly TSS) descriptors. |
339 | * There are NGDT_SYS of them. |
340 | */ |
341 | #define GNULL_SEL 0 /* Null descriptor */ |
342 | #define GCODE_SEL 1 /* Kernel code descriptor */ |
343 | #define GDATA_SEL 2 /* Kernel data descriptor */ |
344 | #define GUCODE_SEL 3 /* User code descriptor */ |
345 | #define GUDATA_SEL 4 /* User data descriptor */ |
346 | #define GAPM32CODE_SEL 5 |
347 | #define GAPM16CODE_SEL 6 |
348 | #define GAPMDATA_SEL 7 |
349 | #define GBIOSCODE_SEL 8 |
350 | #define GBIOSDATA_SEL 9 |
351 | #define GPNPBIOSCODE_SEL 10 |
352 | #define GPNPBIOSDATA_SEL 11 |
353 | #define GPNPBIOSSCRATCH_SEL 12 |
354 | #define GPNPBIOSTRAMP_SEL 13 |
355 | #define GUCODE32_SEL 14 |
356 | #define GUDATA32_SEL 15 |
357 | #define GUFS_SEL 16 /* 32-bit Per-thread %fs */ |
358 | #define GUGS_SEL 17 /* 32-bit Per-thread %gs */ |
359 | #define NGDT_MEM 18 |
360 | |
361 | #define GLDT_SEL 0 /* Default LDT descriptor */ |
362 | #define NGDT_SYS 1 |
363 | |
364 | #define GDT_ADDR_MEM(s,i) \ |
365 | ((struct mem_segment_descriptor *)((s) + ((i) << 3))) |
366 | #define GDT_ADDR_SYS(s,i) \ |
367 | ((struct sys_segment_descriptor *)((s) + (((i) << 4) + SYSSEL_START))) |
368 | |
369 | /* |
370 | * Byte offsets in the Local Descriptor Table (LDT) |
371 | * Strange order because of syscall/sysret insns |
372 | */ |
373 | #define LSYS5CALLS_SEL 0 /* iBCS system call gate */ |
374 | /* 8 second half */ |
375 | #define LSOL26CALLS_SEL 32 /* Solaris 2.6 system call gate */ |
376 | /* 40 second half */ |
377 | #define LUCODE32_SEL 48 /* 32 bit user code descriptor */ |
378 | #define LUDATA_SEL 56 /* User data descriptor */ |
379 | #define LUCODE_SEL 64 /* User code descriptor */ |
380 | #define LUDATA32_SEL 72 /* 32 bit user data descriptor (needed?)*/ |
381 | #define LBSDICALLS_SEL 128 /* BSDI system call gate */ |
382 | /* 136 second half */ |
383 | |
384 | #define LDT_SIZE 144 |
385 | |
386 | #define LSYSRETBASE_SEL LUCODE32_SEL |
387 | |
388 | /* |
389 | * Checks for valid user selectors. If USER_LDT ever gets implemented |
390 | * for amd64, these must check the ldt length and SEL_UPL if a user |
391 | * ldt is active. |
392 | */ |
393 | #define VALID_USER_DSEL32(s) \ |
394 | (((s) & 0xffff) == GSEL(GUDATA32_SEL, SEL_UPL) || \ |
395 | ((s) & 0xffff) == LSEL(LUDATA32_SEL, SEL_UPL)) |
396 | #define VALID_USER_CSEL32(s) \ |
397 | ((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL)) |
398 | #define VALID_USER_FSEL32(s) \ |
399 | (((s) & 0xffff) == GSEL(GUFS_SEL, SEL_UPL)) |
400 | #define VALID_USER_GSEL32(s) \ |
401 | (((s) & 0xffff) == GSEL(GUGS_SEL, SEL_UPL)) |
402 | |
403 | #define VALID_USER_CSEL(s) \ |
404 | ((s) == GSEL(GUCODE_SEL, SEL_UPL) || (s) == LSEL(LUCODE_SEL, SEL_UPL)) |
405 | #define VALID_USER_DSEL(s) \ |
406 | ((s) == GSEL(GUDATA_SEL, SEL_UPL) || (s) == LSEL(LUDATA_SEL, SEL_UPL)) |
407 | |
408 | #else /* __x86_64__ */ |
409 | |
410 | #include <i386/segments.h> |
411 | |
412 | #endif /* __x86_64__ */ |
413 | |
414 | #endif /* _AMD64_SEGMENTS_H_ */ |
415 | |