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. 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 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 35 * $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $ 36 */ 37 38 #ifndef _CPU_SEGMENTS_H_ 39 #define _CPU_SEGMENTS_H_ 40 41 /* 42 * x86_64 Segmentation Data Structures and definitions 43 */ 44 45 /* 46 * Selectors 47 */ 48 49 #define SEL_RPL_MASK 3 /* requester priv level */ 50 #define ISPL(s) ((s)&3) /* what is the privilege level of a selector */ 51 #define SEL_KPL 0 /* kernel privilege level */ 52 #define SEL_UPL 3 /* user privilege level */ 53 #define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */ 54 #define SEL_LDT 4 /* local descriptor table */ 55 #define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */ 56 #define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */ 57 #define GSEL(s,r) (((s)<<3) | r) /* a global selector */ 58 59 #ifndef LOCORE 60 61 /* 62 * User segment descriptors (%cs, %ds etc for compatibility apps. 64 bit wide) 63 * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl, 64 * sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p. 65 */ 66 struct user_segment_descriptor { 67 u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 68 u_int64_t sd_lobase:24; /* segment base address (lsb) */ 69 u_int64_t sd_type:5; /* segment type */ 70 u_int64_t sd_dpl:2; /* segment descriptor priority level */ 71 u_int64_t sd_p:1; /* segment descriptor present */ 72 u_int64_t sd_hilimit:4; /* segment extent (msb) */ 73 u_int64_t sd_xx:1; /* unused */ 74 u_int64_t sd_long:1; /* long mode (cs only) */ 75 u_int64_t sd_def32:1; /* default 32 vs 16 bit size */ 76 u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 77 u_int64_t sd_hibase:8; /* segment base address (msb) */ 78 } __packed; 79 80 /* 81 * System segment descriptors (128 bit wide) 82 */ 83 struct system_segment_descriptor { 84 u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 85 u_int64_t sd_lobase:24; /* segment base address (lsb) */ 86 u_int64_t sd_type:5; /* segment type */ 87 u_int64_t sd_dpl:2; /* segment descriptor priority level */ 88 u_int64_t sd_p:1; /* segment descriptor present */ 89 u_int64_t sd_hilimit:4; /* segment extent (msb) */ 90 u_int64_t sd_xx0:3; /* unused */ 91 u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 92 u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */ 93 u_int64_t sd_xx1:8; 94 u_int64_t sd_mbz:5; /* MUST be zero */ 95 u_int64_t sd_xx2:19; 96 } __packed; 97 98 /* 99 * Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit) 100 * Only interrupt and trap gates have gd_ist. 101 */ 102 struct gate_descriptor { 103 u_int64_t gd_looffset:16; /* gate offset (lsb) */ 104 u_int64_t gd_selector:16; /* gate segment selector */ 105 u_int64_t gd_ist:3; /* IST table index */ 106 u_int64_t gd_xx:5; /* unused */ 107 u_int64_t gd_type:5; /* segment type */ 108 u_int64_t gd_dpl:2; /* segment descriptor priority level */ 109 u_int64_t gd_p:1; /* segment descriptor present */ 110 u_int64_t gd_hioffset:48 __packed; /* gate offset (msb) */ 111 u_int64_t sd_xx1:32; 112 } __packed; 113 114 #endif /* LOCORE */ 115 116 /* system segments and gate types */ 117 #define SDT_SYSNULL 0 /* system null */ 118 #define SDT_SYSLDT 2 /* system 64-bit local descriptor table */ 119 #define SDT_SYSTSS 9 /* system available 64-bit TSS */ 120 #define SDT_SYSBSY 11 /* system busy 64-bit TSS */ 121 #define SDT_SYSCGT 12 /* system 64-bit call gate */ 122 #define SDT_SYSIGT 14 /* system 64-bit interrupt gate */ 123 #define SDT_SYSTGT 15 /* system 64-bit trap gate */ 124 125 /* memory segment types */ 126 #define SDT_MEMRO 16 /* memory read only */ 127 #define SDT_MEMROA 17 /* memory read only accessed */ 128 #define SDT_MEMRW 18 /* memory read write */ 129 #define SDT_MEMRWA 19 /* memory read write accessed */ 130 #define SDT_MEMROD 20 /* memory read only expand dwn limit */ 131 #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ 132 #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ 133 #define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */ 134 #define SDT_MEME 24 /* memory execute only */ 135 #define SDT_MEMEA 25 /* memory execute only accessed */ 136 #define SDT_MEMER 26 /* memory execute read */ 137 #define SDT_MEMERA 27 /* memory execute read accessed */ 138 #define SDT_MEMEC 28 /* memory execute only conforming */ 139 #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ 140 #define SDT_MEMERC 30 /* memory execute read conforming */ 141 #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ 142 143 144 #ifndef LOCORE 145 146 #ifndef _SYS_TLS_H_ 147 #include <sys/tls.h> 148 #endif 149 150 struct savetls { 151 struct tls_info info[2]; 152 }; 153 154 /* is memory segment descriptor pointer ? */ 155 #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC) 156 157 /* is 286 gate descriptor pointer ? */ 158 #define IS286GDP(s) (((s->d_type) >= SDT_SYS286CGT \ 159 && (s->d_type) < SDT_SYS286TGT)) 160 161 /* is 386 gate descriptor pointer ? */ 162 #define IS386GDP(s) (((s->d_type) >= SDT_SYS386CGT \ 163 && (s->d_type) < SDT_SYS386TGT)) 164 165 /* is gate descriptor pointer ? */ 166 #define ISGDP(s) (IS286GDP(s) || IS386GDP(s)) 167 168 /* is segment descriptor pointer ? */ 169 #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s)) 170 171 /* is system segment descriptor pointer ? */ 172 #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s)) 173 174 /* 175 * Software definitions are in this convenient format, 176 * which are translated into inconvenient segment descriptors 177 * when needed to be used by the 386 hardware 178 */ 179 180 struct soft_segment_descriptor { 181 uint64_t ssd_base; /* segment base address */ 182 uint64_t ssd_limit; /* segment extent */ 183 uint64_t ssd_type:5; /* segment type */ 184 uint64_t ssd_dpl:2; /* segment descriptor priority level */ 185 uint64_t ssd_p:1; /* segment descriptor present */ 186 uint64_t ssd_long:1; /* long mode (for %cs) */ 187 uint64_t ssd_def32:1; /* default 32 vs 16 bit size */ 188 uint64_t ssd_gran:1; /* limit granularity (byte/page units)*/ 189 } __packed; 190 191 /* 192 * region descriptors, used to load gdt/idt tables before segments yet exist. 193 */ 194 struct region_descriptor { 195 uint64_t rd_limit:16; /* segment extent */ 196 uint64_t rd_base:64 __packed; /* base address */ 197 } __packed; 198 199 #endif /* LOCORE */ 200 201 /* 202 * Segment Protection Exception code bits 203 */ 204 205 #define SEGEX_EXT 0x01 /* recursive or externally induced */ 206 #define SEGEX_IDT 0x02 /* interrupt descriptor table */ 207 #define SEGEX_TI 0x04 /* local descriptor table */ 208 /* other bits are affected descriptor index */ 209 #define SEGEX_IDX(s) (((s)>>3)&0x1fff) 210 211 /* 212 * Size of the IDT table. 213 */ 214 #define NIDT 256 /* we use them all */ 215 /* 216 * Entries in the Interrupt Descriptor Table (IDT) 217 */ 218 #define IDT_DE 0 /* #DE: Divide Error */ 219 #define IDT_DB 1 /* #DB: Debug */ 220 #define IDT_NMI 2 /* Nonmaskable External Interrupt */ 221 #define IDT_BP 3 /* #BP: Breakpoint */ 222 #define IDT_OF 4 /* #OF: Overflow */ 223 #define IDT_BR 5 /* #BR: Bound Range Exceeded */ 224 #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ 225 #define IDT_NM 7 /* #NM: No Math Coprocessor */ 226 #define IDT_DF 8 /* #DF: Double Fault */ 227 #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ 228 #define IDT_TS 10 /* #TS: Invalid TSS */ 229 #define IDT_NP 11 /* #NP: Segment Not Present */ 230 #define IDT_SS 12 /* #SS: Stack Segment Fault */ 231 #define IDT_GP 13 /* #GP: General Protection Fault */ 232 #define IDT_PF 14 /* #PF: Page Fault */ 233 #define IDT_MF 16 /* #MF: FPU Floating-Point Error */ 234 #define IDT_AC 17 /* #AC: Alignment Check */ 235 #define IDT_MC 18 /* #MC: Machine Check */ 236 #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ 237 #define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ 238 #define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ 239 240 /* 241 * Entries in the Global Descriptor Table (GDT) 242 */ 243 #define GNULL_SEL 0 /* Null Descriptor */ 244 #define GCODE_SEL 1 /* Kernel Code Descriptor */ 245 #define GDATA_SEL 2 /* Kernel Data Descriptor */ 246 #define GUCODE32_SEL 3 /* User 32 bit code Descriptor */ 247 #define GUDATA_SEL 4 /* User 32/64 bit Data Descriptor */ 248 #define GUCODE_SEL 5 /* User 64 bit Code Descriptor */ 249 #define GPROC0_SEL 6 /* TSS for entering kernel etc */ 250 /* slot 7 is second half of GPROC0_SEL */ 251 #define GUGS32_SEL 8 /* User 32 bit GS Descriptor */ 252 #define NGDT 9 253 254 #ifndef LOCORE 255 256 #ifdef _KERNEL 257 extern struct user_segment_descriptor gdt[]; 258 extern struct soft_segment_descriptor gdt_segs[]; 259 extern struct gate_descriptor idt_arr[MAXCPU][NIDT]; 260 extern struct region_descriptor r_idt_arr[]; 261 262 void lgdt(struct region_descriptor *rdp); 263 void sdtossd(struct user_segment_descriptor *sdp, 264 struct soft_segment_descriptor *ssdp); 265 void ssdtosd(struct soft_segment_descriptor *ssdp, 266 struct user_segment_descriptor *sdp); 267 void ssdtosyssd(struct soft_segment_descriptor *ssdp, 268 struct system_segment_descriptor *sdp); 269 #endif /* _KERNEL */ 270 #endif /* LOCORE */ 271 272 #endif /* !_CPU_SEGMENTS_H_ */ 273