| 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 | |