1 /*- 2 * Copyright (c) 1989, 1990 William F. Jolitz 3 * Copyright (c) 1990 The Regents of the University of California. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * William Jolitz. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 34 * $FreeBSD$ 35 */ 36 37 #ifndef _MACHINE_SEGMENTS_H_ 38 #define _MACHINE_SEGMENTS_H_ 39 40 /* 41 * AMD64 Segmentation Data Structures and definitions 42 */ 43 44 /* 45 * Selectors 46 */ 47 48 #define SEL_RPL_MASK 3 /* requester priv level */ 49 #define ISPL(s) ((s)&3) /* what is the priority level of a selector */ 50 #define SEL_KPL 0 /* kernel priority level */ 51 #define SEL_UPL 3 /* user priority level */ 52 #define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */ 53 #define SEL_LDT 4 /* local descriptor table */ 54 #define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */ 55 #define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */ 56 #define GSEL(s,r) (((s)<<3) | r) /* a global selector */ 57 58 /* 59 * User segment descriptors (%cs, %ds etc for compatability apps. 64 bit wide) 60 * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl, 61 * sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p. 62 */ 63 struct user_segment_descriptor { 64 u_int64_t sd_lolimit:16; /* segment extent (lsb) */ 65 u_int64_t sd_lobase:24; /* segment base address (lsb) */ 66 u_int64_t sd_type:5; /* segment type */ 67 u_int64_t sd_dpl:2; /* segment descriptor priority level */ 68 u_int64_t sd_p:1; /* segment descriptor present */ 69 u_int64_t sd_hilimit:4; /* segment extent (msb) */ 70 u_int64_t sd_xx:1; /* unused */ 71 u_int64_t sd_long:1; /* long mode (cs only) */ 72 u_int64_t sd_def32:1; /* default 32 vs 16 bit size */ 73 u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/ 74 u_int64_t sd_hibase:8; /* segment base address (msb) */ 75 } __packed; 76 77 #define USD_GETBASE(sd) (((sd)->sd_lobase) | (sd)->sd_hibase << 24) 78 #define USD_SETBASE(sd, b) (sd)->sd_lobase = (b); \ 79 (sd)->sd_hibase = ((b) >> 24); 80 #define USD_GETLIMIT(sd) (((sd)->sd_lolimit) | (sd)->sd_hilimit << 16) 81 #define USD_SETLIMIT(sd, l) (sd)->sd_lolimit = (l); \ 82 (sd)->sd_hilimit = ((l) >> 16); 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 /* 119 * Generic descriptor 120 */ 121 union descriptor { 122 struct user_segment_descriptor sd; 123 struct gate_descriptor gd; 124 }; 125 126 /* system segments and gate types */ 127 #define SDT_SYSNULL 0 /* system null */ 128 #define SDT_SYS286TSS 1 /* system 286 TSS available */ 129 #define SDT_SYSLDT 2 /* system 64 bit local descriptor table */ 130 #define SDT_SYS286BSY 3 /* system 286 TSS busy */ 131 #define SDT_SYS286CGT 4 /* system 286 call gate */ 132 #define SDT_SYSTASKGT 5 /* system task gate */ 133 #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 134 #define SDT_SYS286TGT 7 /* system 286 trap gate */ 135 #define SDT_SYSNULL2 8 /* system null again */ 136 #define SDT_SYSTSS 9 /* system available 64 bit TSS */ 137 #define SDT_SYSNULL3 10 /* system null again */ 138 #define SDT_SYSBSY 11 /* system busy 64 bit TSS */ 139 #define SDT_SYSCGT 12 /* system 64 bit call gate */ 140 #define SDT_SYSNULL4 13 /* system null again */ 141 #define SDT_SYSIGT 14 /* system 64 bit interrupt gate */ 142 #define SDT_SYSTGT 15 /* system 64 bit trap gate */ 143 144 /* memory segment types */ 145 #define SDT_MEMRO 16 /* memory read only */ 146 #define SDT_MEMROA 17 /* memory read only accessed */ 147 #define SDT_MEMRW 18 /* memory read write */ 148 #define SDT_MEMRWA 19 /* memory read write accessed */ 149 #define SDT_MEMROD 20 /* memory read only expand dwn limit */ 150 #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ 151 #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ 152 #define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */ 153 #define SDT_MEME 24 /* memory execute only */ 154 #define SDT_MEMEA 25 /* memory execute only accessed */ 155 #define SDT_MEMER 26 /* memory execute read */ 156 #define SDT_MEMERA 27 /* memory execute read accessed */ 157 #define SDT_MEMEC 28 /* memory execute only conforming */ 158 #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ 159 #define SDT_MEMERC 30 /* memory execute read conforming */ 160 #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ 161 162 /* 163 * Software definitions are in this convenient format, 164 * which are translated into inconvenient segment descriptors 165 * when needed to be used by the 386 hardware 166 */ 167 168 struct soft_segment_descriptor { 169 unsigned long ssd_base; /* segment base address */ 170 unsigned long ssd_limit; /* segment extent */ 171 unsigned long ssd_type:5; /* segment type */ 172 unsigned long ssd_dpl:2; /* segment descriptor priority level */ 173 unsigned long ssd_p:1; /* segment descriptor present */ 174 unsigned long ssd_long:1; /* long mode (for %cs) */ 175 unsigned long ssd_def32:1; /* default 32 vs 16 bit size */ 176 unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/ 177 } __packed; 178 179 /* 180 * region descriptors, used to load gdt/idt tables before segments yet exist. 181 */ 182 struct region_descriptor { 183 unsigned long rd_limit:16; /* segment extent */ 184 unsigned long rd_base:64 __packed; /* base address */ 185 } __packed; 186 187 /* 188 * Size of IDT table 189 */ 190 #define NIDT 256 /* 32 reserved, 16 h/w, 0 s/w, linux's 0x80 */ 191 #define NRSVIDT 32 /* reserved entries for cpu exceptions */ 192 193 /* 194 * Entries in the Interrupt Descriptor Table (IDT) 195 */ 196 #define IDT_DE 0 /* #DE: Divide Error */ 197 #define IDT_DB 1 /* #DB: Debug */ 198 #define IDT_NMI 2 /* Nonmaskable External Interrupt */ 199 #define IDT_BP 3 /* #BP: Breakpoint */ 200 #define IDT_OF 4 /* #OF: Overflow */ 201 #define IDT_BR 5 /* #BR: Bound Range Exceeded */ 202 #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ 203 #define IDT_NM 7 /* #NM: No Math Coprocessor */ 204 #define IDT_DF 8 /* #DF: Double Fault */ 205 #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ 206 #define IDT_TS 10 /* #TS: Invalid TSS */ 207 #define IDT_NP 11 /* #NP: Segment Not Present */ 208 #define IDT_SS 12 /* #SS: Stack Segment Fault */ 209 #define IDT_GP 13 /* #GP: General Protection Fault */ 210 #define IDT_PF 14 /* #PF: Page Fault */ 211 #define IDT_MF 16 /* #MF: FPU Floating-Point Error */ 212 #define IDT_AC 17 /* #AC: Alignment Check */ 213 #define IDT_MC 18 /* #MC: Machine Check */ 214 #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ 215 #define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ 216 #define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ 217 #define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */ 218 219 /* 220 * Entries in the Global Descriptor Table (GDT) 221 */ 222 #define GNULL_SEL 0 /* Null Descriptor */ 223 #define GNULL2_SEL 1 /* Null Descriptor */ 224 #define GUFS32_SEL 2 /* User 32 bit %fs Descriptor */ 225 #define GUGS32_SEL 3 /* User 32 bit %gs Descriptor */ 226 #define GCODE_SEL 4 /* Kernel Code Descriptor */ 227 #define GDATA_SEL 5 /* Kernel Data Descriptor */ 228 #define GUCODE32_SEL 6 /* User 32 bit code Descriptor */ 229 #define GUDATA_SEL 7 /* User 32/64 bit Data Descriptor */ 230 #define GUCODE_SEL 8 /* User 64 bit Code Descriptor */ 231 #define GPROC0_SEL 9 /* TSS for entering kernel etc */ 232 /* slot 10 is second half of GPROC0_SEL */ 233 #define GUSERLDT_SEL 11 /* LDT */ 234 /* slot 11 is second half of GUSERLDT_SEL */ 235 #define NGDT 13 236 237 #ifdef _KERNEL 238 extern struct user_segment_descriptor gdt[]; 239 extern struct soft_segment_descriptor gdt_segs[]; 240 extern struct gate_descriptor *idt; 241 extern struct region_descriptor r_gdt, r_idt; 242 243 void lgdt(struct region_descriptor *rdp); 244 void sdtossd(struct user_segment_descriptor *sdp, 245 struct soft_segment_descriptor *ssdp); 246 void ssdtosd(struct soft_segment_descriptor *ssdp, 247 struct user_segment_descriptor *sdp); 248 void ssdtosyssd(struct soft_segment_descriptor *ssdp, 249 struct system_segment_descriptor *sdp); 250 void update_gdt_gsbase(struct thread *td, uint32_t base); 251 void update_gdt_fsbase(struct thread *td, uint32_t base); 252 253 #endif /* _KERNEL */ 254 255 #endif /* !_MACHINE_SEGMENTS_H_ */ 256