1233203Stijl/*- 2233203Stijl * Copyright (c) 1989, 1990 William F. Jolitz 3233203Stijl * Copyright (c) 1990 The Regents of the University of California. 4233203Stijl * All rights reserved. 5233203Stijl * 6233203Stijl * This code is derived from software contributed to Berkeley by 7233203Stijl * William Jolitz. 8233203Stijl * 9233203Stijl * Redistribution and use in source and binary forms, with or without 10233203Stijl * modification, are permitted provided that the following conditions 11233203Stijl * are met: 12233203Stijl * 1. Redistributions of source code must retain the above copyright 13233203Stijl * notice, this list of conditions and the following disclaimer. 14233203Stijl * 2. Redistributions in binary form must reproduce the above copyright 15233203Stijl * notice, this list of conditions and the following disclaimer in the 16233203Stijl * documentation and/or other materials provided with the distribution. 17233203Stijl * 4. Neither the name of the University nor the names of its contributors 18233203Stijl * may be used to endorse or promote products derived from this software 19233203Stijl * without specific prior written permission. 20233203Stijl * 21233203Stijl * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22233203Stijl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23233203Stijl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24233203Stijl * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25233203Stijl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26233203Stijl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27233203Stijl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28233203Stijl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29233203Stijl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30233203Stijl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31233203Stijl * SUCH DAMAGE. 32233203Stijl * 33233203Stijl * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 34233203Stijl * $FreeBSD: releng/10.3/sys/x86/include/segments.h 255040 2013-08-29 19:52:18Z gibbs $ 35233203Stijl */ 36233203Stijl 37233203Stijl#ifndef _X86_SEGMENTS_H_ 38233203Stijl#define _X86_SEGMENTS_H_ 39233203Stijl 40233203Stijl/* 41233203Stijl * X86 Segmentation Data Structures and definitions 42233203Stijl */ 43233203Stijl 44233203Stijl/* 45233203Stijl * Selectors 46233203Stijl */ 47233203Stijl#define SEL_RPL_MASK 3 /* requester priv level */ 48233203Stijl#define ISPL(s) ((s)&3) /* priority level of a selector */ 49233203Stijl#ifdef XEN 50233203Stijl#define SEL_KPL 1 /* kernel priority level */ 51233203Stijl#else 52233203Stijl#define SEL_KPL 0 /* kernel priority level */ 53233203Stijl#endif 54233203Stijl#define SEL_UPL 3 /* user priority level */ 55233203Stijl#define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */ 56233203Stijl#define SEL_LDT 4 /* local descriptor table */ 57233203Stijl#define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */ 58233203Stijl#define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */ 59233203Stijl#define GSEL(s,r) (((s)<<3) | r) /* a global selector */ 60233203Stijl 61233203Stijl/* 62233203Stijl * User segment descriptors (%cs, %ds etc for i386 apps. 64 bit wide) 63233203Stijl * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl, 64233203Stijl * sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p. 65233203Stijl */ 66233203Stijlstruct segment_descriptor { 67233203Stijl unsigned sd_lolimit:16; /* segment extent (lsb) */ 68233203Stijl unsigned sd_lobase:24; /* segment base address (lsb) */ 69233203Stijl unsigned sd_type:5; /* segment type */ 70233203Stijl unsigned sd_dpl:2; /* segment descriptor priority level */ 71233203Stijl unsigned sd_p:1; /* segment descriptor present */ 72233203Stijl unsigned sd_hilimit:4; /* segment extent (msb) */ 73233203Stijl unsigned sd_xx:2; /* unused */ 74233203Stijl unsigned sd_def32:1; /* default 32 vs 16 bit size */ 75233203Stijl unsigned sd_gran:1; /* limit granularity (byte/page units)*/ 76233203Stijl unsigned sd_hibase:8; /* segment base address (msb) */ 77233203Stijl} __packed; 78233203Stijl 79233203Stijlstruct user_segment_descriptor { 80233203Stijl unsigned sd_lolimit:16; /* segment extent (lsb) */ 81233203Stijl unsigned sd_lobase:24; /* segment base address (lsb) */ 82233203Stijl unsigned sd_type:5; /* segment type */ 83233203Stijl unsigned sd_dpl:2; /* segment descriptor priority level */ 84233203Stijl unsigned sd_p:1; /* segment descriptor present */ 85233203Stijl unsigned sd_hilimit:4; /* segment extent (msb) */ 86233203Stijl unsigned sd_xx:1; /* unused */ 87233203Stijl unsigned sd_long:1; /* long mode (cs only) */ 88233203Stijl unsigned sd_def32:1; /* default 32 vs 16 bit size */ 89233203Stijl unsigned sd_gran:1; /* limit granularity (byte/page units)*/ 90233203Stijl unsigned sd_hibase:8; /* segment base address (msb) */ 91233203Stijl} __packed; 92233203Stijl 93233203Stijl#define USD_GETBASE(sd) (((sd)->sd_lobase) | (sd)->sd_hibase << 24) 94233203Stijl#define USD_SETBASE(sd, b) (sd)->sd_lobase = (b); \ 95233203Stijl (sd)->sd_hibase = ((b) >> 24); 96233203Stijl#define USD_GETLIMIT(sd) (((sd)->sd_lolimit) | (sd)->sd_hilimit << 16) 97233203Stijl#define USD_SETLIMIT(sd, l) (sd)->sd_lolimit = (l); \ 98233203Stijl (sd)->sd_hilimit = ((l) >> 16); 99233203Stijl 100233203Stijl#ifdef __i386__ 101233203Stijl/* 102233203Stijl * Gate descriptors (e.g. indirect descriptors) 103233203Stijl */ 104233203Stijlstruct gate_descriptor { 105233203Stijl unsigned gd_looffset:16; /* gate offset (lsb) */ 106233203Stijl unsigned gd_selector:16; /* gate segment selector */ 107233203Stijl unsigned gd_stkcpy:5; /* number of stack wds to cpy */ 108233203Stijl unsigned gd_xx:3; /* unused */ 109233203Stijl unsigned gd_type:5; /* segment type */ 110233203Stijl unsigned gd_dpl:2; /* segment descriptor priority level */ 111233203Stijl unsigned gd_p:1; /* segment descriptor present */ 112233203Stijl unsigned gd_hioffset:16; /* gate offset (msb) */ 113233203Stijl} __packed; 114233203Stijl 115233203Stijl/* 116233203Stijl * Generic descriptor 117233203Stijl */ 118233203Stijlunion descriptor { 119233203Stijl struct segment_descriptor sd; 120233203Stijl struct gate_descriptor gd; 121233203Stijl}; 122233203Stijl#else 123233203Stijl/* 124233203Stijl * Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit) 125233203Stijl * Only interrupt and trap gates have gd_ist. 126233203Stijl */ 127233203Stijlstruct gate_descriptor { 128233203Stijl uint64_t gd_looffset:16; /* gate offset (lsb) */ 129233203Stijl uint64_t gd_selector:16; /* gate segment selector */ 130233203Stijl uint64_t gd_ist:3; /* IST table index */ 131233203Stijl uint64_t gd_xx:5; /* unused */ 132233203Stijl uint64_t gd_type:5; /* segment type */ 133233203Stijl uint64_t gd_dpl:2; /* segment descriptor priority level */ 134233203Stijl uint64_t gd_p:1; /* segment descriptor present */ 135233203Stijl uint64_t gd_hioffset:48; /* gate offset (msb) */ 136233203Stijl uint64_t sd_xx1:32; 137233203Stijl} __packed; 138233203Stijl 139233203Stijl/* 140233203Stijl * Generic descriptor 141233203Stijl */ 142233203Stijlunion descriptor { 143233203Stijl struct user_segment_descriptor sd; 144233203Stijl struct gate_descriptor gd; 145233203Stijl}; 146233203Stijl#endif 147233203Stijl 148233203Stijl /* system segments and gate types */ 149233203Stijl#define SDT_SYSNULL 0 /* system null */ 150233203Stijl#define SDT_SYS286TSS 1 /* system 286 TSS available */ 151233203Stijl#define SDT_SYSLDT 2 /* system local descriptor table */ 152233203Stijl#define SDT_SYS286BSY 3 /* system 286 TSS busy */ 153233203Stijl#define SDT_SYS286CGT 4 /* system 286 call gate */ 154233203Stijl#define SDT_SYSTASKGT 5 /* system task gate */ 155233203Stijl#define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 156233203Stijl#define SDT_SYS286TGT 7 /* system 286 trap gate */ 157233203Stijl#define SDT_SYSNULL2 8 /* system null again */ 158233203Stijl#define SDT_SYS386TSS 9 /* system 386 TSS available */ 159233203Stijl#define SDT_SYSTSS 9 /* system available 64 bit TSS */ 160233203Stijl#define SDT_SYSNULL3 10 /* system null again */ 161233203Stijl#define SDT_SYS386BSY 11 /* system 386 TSS busy */ 162233203Stijl#define SDT_SYSBSY 11 /* system busy 64 bit TSS */ 163233203Stijl#define SDT_SYS386CGT 12 /* system 386 call gate */ 164233203Stijl#define SDT_SYSCGT 12 /* system 64 bit call gate */ 165233203Stijl#define SDT_SYSNULL4 13 /* system null again */ 166233203Stijl#define SDT_SYS386IGT 14 /* system 386 interrupt gate */ 167233203Stijl#define SDT_SYSIGT 14 /* system 64 bit interrupt gate */ 168233203Stijl#define SDT_SYS386TGT 15 /* system 386 trap gate */ 169233203Stijl#define SDT_SYSTGT 15 /* system 64 bit trap gate */ 170233203Stijl 171233203Stijl /* memory segment types */ 172233203Stijl#define SDT_MEMRO 16 /* memory read only */ 173233203Stijl#define SDT_MEMROA 17 /* memory read only accessed */ 174233203Stijl#define SDT_MEMRW 18 /* memory read write */ 175233203Stijl#define SDT_MEMRWA 19 /* memory read write accessed */ 176233203Stijl#define SDT_MEMROD 20 /* memory read only expand dwn limit */ 177233203Stijl#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ 178233203Stijl#define SDT_MEMRWD 22 /* memory read write expand dwn limit */ 179233203Stijl#define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed*/ 180233203Stijl#define SDT_MEME 24 /* memory execute only */ 181233203Stijl#define SDT_MEMEA 25 /* memory execute only accessed */ 182233203Stijl#define SDT_MEMER 26 /* memory execute read */ 183233203Stijl#define SDT_MEMERA 27 /* memory execute read accessed */ 184233203Stijl#define SDT_MEMEC 28 /* memory execute only conforming */ 185233203Stijl#define SDT_MEMEAC 29 /* memory execute only accessed conforming */ 186233203Stijl#define SDT_MEMERC 30 /* memory execute read conforming */ 187233203Stijl#define SDT_MEMERAC 31 /* memory execute read accessed conforming */ 188233203Stijl 189233203Stijl/* 190233203Stijl * Size of IDT table 191233203Stijl */ 192233203Stijl#define NIDT 256 /* 32 reserved, 0x80 syscall, most are h/w */ 193233203Stijl#define NRSVIDT 32 /* reserved entries for cpu exceptions */ 194233203Stijl 195233203Stijl/* 196233203Stijl * Entries in the Interrupt Descriptor Table (IDT) 197233203Stijl */ 198233203Stijl#define IDT_DE 0 /* #DE: Divide Error */ 199233203Stijl#define IDT_DB 1 /* #DB: Debug */ 200233203Stijl#define IDT_NMI 2 /* Nonmaskable External Interrupt */ 201233203Stijl#define IDT_BP 3 /* #BP: Breakpoint */ 202233203Stijl#define IDT_OF 4 /* #OF: Overflow */ 203233203Stijl#define IDT_BR 5 /* #BR: Bound Range Exceeded */ 204233203Stijl#define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ 205233203Stijl#define IDT_NM 7 /* #NM: No Math Coprocessor */ 206233203Stijl#define IDT_DF 8 /* #DF: Double Fault */ 207233203Stijl#define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ 208233203Stijl#define IDT_TS 10 /* #TS: Invalid TSS */ 209233203Stijl#define IDT_NP 11 /* #NP: Segment Not Present */ 210233203Stijl#define IDT_SS 12 /* #SS: Stack Segment Fault */ 211233203Stijl#define IDT_GP 13 /* #GP: General Protection Fault */ 212233203Stijl#define IDT_PF 14 /* #PF: Page Fault */ 213233203Stijl#define IDT_MF 16 /* #MF: FPU Floating-Point Error */ 214233203Stijl#define IDT_AC 17 /* #AC: Alignment Check */ 215233203Stijl#define IDT_MC 18 /* #MC: Machine Check */ 216233203Stijl#define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ 217233203Stijl#define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ 218233203Stijl#define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ 219233613Sjhb#define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */ 220255040Sgibbs#define IDT_EVTCHN 0x93 /* Xen HVM Event Channel Interrupt Vector */ 221233203Stijl 222233203Stijl#if defined(__i386__) || defined(__ia64__) 223233203Stijl/* 224233203Stijl * Entries in the Global Descriptor Table (GDT) 225233203Stijl * Note that each 4 entries share a single 32 byte L1 cache line. 226233203Stijl * Some of the fast syscall instructions require a specific order here. 227233203Stijl */ 228233203Stijl#define GNULL_SEL 0 /* Null Descriptor */ 229233203Stijl#define GPRIV_SEL 1 /* SMP Per-Processor Private Data */ 230233203Stijl#define GUFS_SEL 2 /* User %fs Descriptor (order critical: 1) */ 231233203Stijl#define GUGS_SEL 3 /* User %gs Descriptor (order critical: 2) */ 232233203Stijl#define GCODE_SEL 4 /* Kernel Code Descriptor (order critical: 1) */ 233233203Stijl#define GDATA_SEL 5 /* Kernel Data Descriptor (order critical: 2) */ 234233203Stijl#define GUCODE_SEL 6 /* User Code Descriptor (order critical: 3) */ 235233203Stijl#define GUDATA_SEL 7 /* User Data Descriptor (order critical: 4) */ 236233203Stijl#define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */ 237233203Stijl#define GPROC0_SEL 9 /* Task state process slot zero and up */ 238233203Stijl#define GLDT_SEL 10 /* Default User LDT */ 239233203Stijl#define GUSERLDT_SEL 11 /* User LDT */ 240233203Stijl#define GPANIC_SEL 12 /* Task state to consider panic from */ 241233203Stijl#define GBIOSCODE32_SEL 13 /* BIOS interface (32bit Code) */ 242233203Stijl#define GBIOSCODE16_SEL 14 /* BIOS interface (16bit Code) */ 243233203Stijl#define GBIOSDATA_SEL 15 /* BIOS interface (Data) */ 244233203Stijl#define GBIOSUTIL_SEL 16 /* BIOS interface (Utility) */ 245233203Stijl#define GBIOSARGS_SEL 17 /* BIOS interface (Arguments) */ 246233203Stijl#define GNDIS_SEL 18 /* For the NDIS layer */ 247233203Stijl#ifdef XEN 248233203Stijl#define NGDT 9 249233203Stijl#else 250233203Stijl#define NGDT 19 251233203Stijl#endif 252233203Stijl 253233203Stijl/* 254233203Stijl * Entries in the Local Descriptor Table (LDT) 255233203Stijl */ 256233203Stijl#define LSYS5CALLS_SEL 0 /* forced by intel BCS */ 257233203Stijl#define LSYS5SIGR_SEL 1 258233203Stijl#define L43BSDCALLS_SEL 2 /* notyet */ 259233203Stijl#define LUCODE_SEL 3 260233203Stijl#define LSOL26CALLS_SEL 4 /* Solaris >= 2.6 system call gate */ 261233203Stijl#define LUDATA_SEL 5 262233203Stijl/* separate stack, es,fs,gs sels ? */ 263233203Stijl/* #define LPOSIXCALLS_SEL 5*/ /* notyet */ 264233203Stijl#define LBSDICALLS_SEL 16 /* BSDI system call gate */ 265233203Stijl#define NLDT (LBSDICALLS_SEL + 1) 266233203Stijl 267233203Stijl#else /* !__i386__ && !__ia64__ */ 268233203Stijl/* 269233203Stijl * Entries in the Global Descriptor Table (GDT) 270233203Stijl */ 271233203Stijl#define GNULL_SEL 0 /* Null Descriptor */ 272233203Stijl#define GNULL2_SEL 1 /* Null Descriptor */ 273233203Stijl#define GUFS32_SEL 2 /* User 32 bit %fs Descriptor */ 274233203Stijl#define GUGS32_SEL 3 /* User 32 bit %gs Descriptor */ 275233203Stijl#define GCODE_SEL 4 /* Kernel Code Descriptor */ 276233203Stijl#define GDATA_SEL 5 /* Kernel Data Descriptor */ 277233203Stijl#define GUCODE32_SEL 6 /* User 32 bit code Descriptor */ 278233203Stijl#define GUDATA_SEL 7 /* User 32/64 bit Data Descriptor */ 279233203Stijl#define GUCODE_SEL 8 /* User 64 bit Code Descriptor */ 280233203Stijl#define GPROC0_SEL 9 /* TSS for entering kernel etc */ 281233203Stijl/* slot 10 is second half of GPROC0_SEL */ 282233203Stijl#define GUSERLDT_SEL 11 /* LDT */ 283233203Stijl/* slot 12 is second half of GUSERLDT_SEL */ 284233203Stijl#define NGDT 13 285233203Stijl#endif /* __i386__ || __ia64__ */ 286233203Stijl 287233203Stijl#endif /* !_X86_SEGMENTS_H_ */ 288