| 1 | /*- |
| 2 | * Copyright (c) 1989, 1990 William F. Jolitz |
| 3 | * Copyright (c) 1990 The Regents of the University of California. |
| 4 | * Copyright (c) 2008 The DragonFly Project. |
| 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. All advertising materials mentioning features or use of this software |
| 19 | * must display the following acknowledgement: |
| 20 | * This product includes software developed by the University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 |
| 39 | * $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $ |
| 40 | */ |
| 41 | |
| 42 | #ifndef _CPU_SEGMENTS_H_ |
| 43 | #define _CPU_SEGMENTS_H_ |
| 44 | |
| 45 | /* |
| 46 | * x86_64 Segmentation Data Structures and definitions |
| 47 | */ |
| 48 | |
| 49 | /* |
| 50 | * Selectors |
| 51 | */ |
| 52 | |
| 53 | #define SEL_RPL_MASK 3 /* requester priv level */ |
| 54 | #define ISPL(s) ((s)&3) /* what is the privilege level of a selector */ |
| 55 | #define SEL_KPL 0 /* kernel privilege level */ |
| 56 | #define SEL_UPL 3 /* user privilege level */ |
| 57 | #define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */ |
| 58 | #define SEL_LDT 4 /* local descriptor table */ |
| 59 | #define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */ |
| 60 | #define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */ |
| 61 | #define GSEL(s,r) (((s)<<3) | r) /* a global selector */ |
| 62 | |
| 63 | #ifndef LOCORE |
| 64 | |
| 65 | /* |
| 66 | * User segment descriptors (%cs, %ds etc for compatability apps. 64 bit wide) |
| 67 | * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl, |
| 68 | * sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p. |
| 69 | */ |
| 70 | struct user_segment_descriptor { |
| 71 | u_int64_t sd_lolimit:16; /* segment extent (lsb) */ |
| 72 | u_int64_t sd_lobase:24; /* segment base address (lsb) */ |
| 73 | u_int64_t sd_type:5; /* segment type */ |
| 74 | u_int64_t sd_dpl:2; /* segment descriptor priority level */ |
| 75 | u_int64_t sd_p:1; /* segment descriptor present */ |
| 76 | u_int64_t sd_hilimit:4; /* segment extent (msb) */ |
| 77 | u_int64_t sd_xx:1; /* unused */ |
| 78 | u_int64_t sd_long:1; /* long mode (cs only) */ |
| 79 | u_int64_t sd_def32:1; /* default 32 vs 16 bit size */ |
| 80 | u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ |
| 81 | u_int64_t sd_hibase:8; /* segment base address (msb) */ |
| 82 | } __packed; |
| 83 | |
| 84 | /* |
| 85 | * System segment descriptors (128 bit wide) |
| 86 | */ |
| 87 | struct system_segment_descriptor { |
| 88 | u_int64_t sd_lolimit:16; /* segment extent (lsb) */ |
| 89 | u_int64_t sd_lobase:24; /* segment base address (lsb) */ |
| 90 | u_int64_t sd_type:5; /* segment type */ |
| 91 | u_int64_t sd_dpl:2; /* segment descriptor priority level */ |
| 92 | u_int64_t sd_p:1; /* segment descriptor present */ |
| 93 | u_int64_t sd_hilimit:4; /* segment extent (msb) */ |
| 94 | u_int64_t sd_xx0:3; /* unused */ |
| 95 | u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ |
| 96 | u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ |
| 97 | u_int64_t sd_xx1:8; |
| 98 | u_int64_t sd_mbz:5; /* MUST be zero */ |
| 99 | u_int64_t sd_xx2:19; |
| 100 | } __packed; |
| 101 | |
| 102 | /* |
| 103 | * Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit) |
| 104 | * Only interrupt and trap gates have gd_ist. |
| 105 | */ |
| 106 | struct gate_descriptor { |
| 107 | u_int64_t gd_looffset:16; /* gate offset (lsb) */ |
| 108 | u_int64_t gd_selector:16; /* gate segment selector */ |
| 109 | u_int64_t gd_ist:3; /* IST table index */ |
| 110 | u_int64_t gd_xx:5; /* unused */ |
| 111 | u_int64_t gd_type:5; /* segment type */ |
| 112 | u_int64_t gd_dpl:2; /* segment descriptor priority level */ |
| 113 | u_int64_t gd_p:1; /* segment descriptor present */ |
| 114 | u_int64_t gd_hioffset:48 __packed; /* gate offset (msb) */ |
| 115 | u_int64_t sd_xx1:32; |
| 116 | } __packed; |
| 117 | |
| 118 | #endif /* LOCORE */ |
| 119 | |
| 120 | /* system segments and gate types */ |
| 121 | #define SDT_SYSNULL 0 /* system null */ |
| 122 | #define SDT_SYSLDT 2 /* system 64-bit local descriptor table */ |
| 123 | #define SDT_SYSTSS 9 /* system available 64-bit TSS */ |
| 124 | #define SDT_SYSBSY 11 /* system busy 64-bit TSS */ |
| 125 | #define SDT_SYSCGT 12 /* system 64-bit call gate */ |
| 126 | #define SDT_SYSIGT 14 /* system 64-bit interrupt gate */ |
| 127 | #define SDT_SYSTGT 15 /* system 64-bit trap gate */ |
| 128 | |
| 129 | /* memory segment types */ |
| 130 | #define SDT_MEMRO 16 /* memory read only */ |
| 131 | #define SDT_MEMROA 17 /* memory read only accessed */ |
| 132 | #define SDT_MEMRW 18 /* memory read write */ |
| 133 | #define SDT_MEMRWA 19 /* memory read write accessed */ |
| 134 | #define SDT_MEMROD 20 /* memory read only expand dwn limit */ |
| 135 | #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ |
| 136 | #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ |
| 137 | #define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */ |
| 138 | #define SDT_MEME 24 /* memory execute only */ |
| 139 | #define SDT_MEMEA 25 /* memory execute only accessed */ |
| 140 | #define SDT_MEMER 26 /* memory execute read */ |
| 141 | #define SDT_MEMERA 27 /* memory execute read accessed */ |
| 142 | #define SDT_MEMEC 28 /* memory execute only conforming */ |
| 143 | #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ |
| 144 | #define SDT_MEMERC 30 /* memory execute read conforming */ |
| 145 | #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ |
| 146 | |
| 147 | |
| 148 | #ifndef LOCORE |
| 149 | |
| 150 | #ifndef _SYS_TLS_H_ |
| 151 | #include <sys/tls.h> |
| 152 | #endif |
| 153 | |
| 154 | struct savetls { |
| 155 | struct tls_info info[2]; |
| 156 | }; |
| 157 | |
| 158 | /* is memory segment descriptor pointer ? */ |
| 159 | #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC) |
| 160 | |
| 161 | /* is 286 gate descriptor pointer ? */ |
| 162 | #define IS286GDP(s) (((s->d_type) >= SDT_SYS286CGT \ |
| 163 | && (s->d_type) < SDT_SYS286TGT)) |
| 164 | |
| 165 | /* is 386 gate descriptor pointer ? */ |
| 166 | #define IS386GDP(s) (((s->d_type) >= SDT_SYS386CGT \ |
| 167 | && (s->d_type) < SDT_SYS386TGT)) |
| 168 | |
| 169 | /* is gate descriptor pointer ? */ |
| 170 | #define ISGDP(s) (IS286GDP(s) || IS386GDP(s)) |
| 171 | |
| 172 | /* is segment descriptor pointer ? */ |
| 173 | #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s)) |
| 174 | |
| 175 | /* is system segment descriptor pointer ? */ |
| 176 | #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s)) |
| 177 | |
| 178 | /* |
| 179 | * Software definitions are in this convenient format, |
| 180 | * which are translated into inconvenient segment descriptors |
| 181 | * when needed to be used by the 386 hardware |
| 182 | */ |
| 183 | |
| 184 | struct soft_segment_descriptor { |
| 185 | uint64_t ssd_base; /* segment base address */ |
| 186 | uint64_t ssd_limit; /* segment extent */ |
| 187 | uint64_t ssd_type:5; /* segment type */ |
| 188 | uint64_t ssd_dpl:2; /* segment descriptor priority level */ |
| 189 | uint64_t ssd_p:1; /* segment descriptor present */ |
| 190 | uint64_t ssd_long:1; /* long mode (for %cs) */ |
| 191 | uint64_t ssd_def32:1; /* default 32 vs 16 bit size */ |
| 192 | uint64_t ssd_gran:1; /* limit granularity (byte/page units)*/ |
| 193 | } __packed; |
| 194 | |
| 195 | /* |
| 196 | * region descriptors, used to load gdt/idt tables before segments yet exist. |
| 197 | */ |
| 198 | struct region_descriptor { |
| 199 | uint64_t rd_limit:16; /* segment extent */ |
| 200 | uint64_t rd_base:64 __packed; /* base address */ |
| 201 | } __packed; |
| 202 | |
| 203 | #endif /* LOCORE */ |
| 204 | |
| 205 | /* |
| 206 | * Segment Protection Exception code bits |
| 207 | */ |
| 208 | |
| 209 | #define SEGEX_EXT 0x01 /* recursive or externally induced */ |
| 210 | #define SEGEX_IDT 0x02 /* interrupt descriptor table */ |
| 211 | #define SEGEX_TI 0x04 /* local descriptor table */ |
| 212 | /* other bits are affected descriptor index */ |
| 213 | #define SEGEX_IDX(s) (((s)>>3)&0x1fff) |
| 214 | |
| 215 | /* |
| 216 | * Size of the IDT table. Theoretically we only need to cover past 0x81 |
| 217 | * (NIDT=130) if not running APIC_IO or SMP, but at this point we might |
| 218 | * as well just use all of them. |
| 219 | */ |
| 220 | #define NIDT 256 /* we use them all */ |
| 221 | /* |
| 222 | * Entries in the Interrupt Descriptor Table (IDT) |
| 223 | */ |
| 224 | #define IDT_DE 0 /* #DE: Divide Error */ |
| 225 | #define IDT_DB 1 /* #DB: Debug */ |
| 226 | #define IDT_NMI 2 /* Nonmaskable External Interrupt */ |
| 227 | #define IDT_BP 3 /* #BP: Breakpoint */ |
| 228 | #define IDT_OF 4 /* #OF: Overflow */ |
| 229 | #define IDT_BR 5 /* #BR: Bound Range Exceeded */ |
| 230 | #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ |
| 231 | #define IDT_NM 7 /* #NM: No Math Coprocessor */ |
| 232 | #define IDT_DF 8 /* #DF: Double Fault */ |
| 233 | #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ |
| 234 | #define IDT_TS 10 /* #TS: Invalid TSS */ |
| 235 | #define IDT_NP 11 /* #NP: Segment Not Present */ |
| 236 | #define IDT_SS 12 /* #SS: Stack Segment Fault */ |
| 237 | #define IDT_GP 13 /* #GP: General Protection Fault */ |
| 238 | #define IDT_PF 14 /* #PF: Page Fault */ |
| 239 | #define IDT_MF 16 /* #MF: FPU Floating-Point Error */ |
| 240 | #define IDT_AC 17 /* #AC: Alignment Check */ |
| 241 | #define IDT_MC 18 /* #MC: Machine Check */ |
| 242 | #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ |
| 243 | #define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ |
| 244 | #define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ |
| 245 | |
| 246 | /* |
| 247 | * Entries in the Global Descriptor Table (GDT) |
| 248 | */ |
| 249 | #define GNULL_SEL 0 /* Null Descriptor */ |
| 250 | #define GCODE_SEL 1 /* Kernel Code Descriptor */ |
| 251 | #define GDATA_SEL 2 /* Kernel Data Descriptor */ |
| 252 | #define GUCODE32_SEL 3 /* User 32 bit code Descriptor */ |
| 253 | #define GUDATA_SEL 4 /* User 32/64 bit Data Descriptor */ |
| 254 | #define GUCODE_SEL 5 /* User 64 bit Code Descriptor */ |
| 255 | #define GPROC0_SEL 6 /* TSS for entering kernel etc */ |
| 256 | /* slot 7 is second half of GPROC0_SEL */ |
| 257 | #define GUGS32_SEL 8 /* User 32 bit GS Descriptor */ |
| 258 | #define NGDT 9 |
| 259 | |
| 260 | #ifndef LOCORE |
| 261 | |
| 262 | #ifdef _KERNEL |
| 263 | extern struct user_segment_descriptor gdt[]; |
| 264 | extern struct soft_segment_descriptor gdt_segs[]; |
| 265 | extern struct gate_descriptor *idt; |
| 266 | |
| 267 | void lgdt(struct region_descriptor *rdp); |
| 268 | void sdtossd(struct user_segment_descriptor *sdp, |
| 269 | struct soft_segment_descriptor *ssdp); |
| 270 | void ssdtosd(struct soft_segment_descriptor *ssdp, |
| 271 | struct user_segment_descriptor *sdp); |
| 272 | void ssdtosyssd(struct soft_segment_descriptor *ssdp, |
| 273 | struct system_segment_descriptor *sdp); |
| 274 | #endif /* _KERNEL */ |
| 275 | #endif /* LOCORE */ |
| 276 | |
| 277 | #endif /* !_CPU_SEGMENTS_H_ */ |