1*9c8f3233SToomas Soome /*- 2*9c8f3233SToomas Soome * Copyright (c) 1989, 1990 William F. Jolitz 3*9c8f3233SToomas Soome * Copyright (c) 1990 The Regents of the University of California. 4*9c8f3233SToomas Soome * All rights reserved. 5*9c8f3233SToomas Soome * 6*9c8f3233SToomas Soome * This code is derived from software contributed to Berkeley by 7*9c8f3233SToomas Soome * William Jolitz. 8*9c8f3233SToomas Soome * 9*9c8f3233SToomas Soome * Redistribution and use in source and binary forms, with or without 10*9c8f3233SToomas Soome * modification, are permitted provided that the following conditions 11*9c8f3233SToomas Soome * are met: 12*9c8f3233SToomas Soome * 1. Redistributions of source code must retain the above copyright 13*9c8f3233SToomas Soome * notice, this list of conditions and the following disclaimer. 14*9c8f3233SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 15*9c8f3233SToomas Soome * notice, this list of conditions and the following disclaimer in the 16*9c8f3233SToomas Soome * documentation and/or other materials provided with the distribution. 17*9c8f3233SToomas Soome * 3. Neither the name of the University nor the names of its contributors 18*9c8f3233SToomas Soome * may be used to endorse or promote products derived from this software 19*9c8f3233SToomas Soome * without specific prior written permission. 20*9c8f3233SToomas Soome * 21*9c8f3233SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22*9c8f3233SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23*9c8f3233SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24*9c8f3233SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25*9c8f3233SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26*9c8f3233SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27*9c8f3233SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28*9c8f3233SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29*9c8f3233SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30*9c8f3233SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31*9c8f3233SToomas Soome * SUCH DAMAGE. 32*9c8f3233SToomas Soome * 33*9c8f3233SToomas Soome * from: @(#)segments.h 7.1 (Berkeley) 5/9/91 34*9c8f3233SToomas Soome */ 35*9c8f3233SToomas Soome 36*9c8f3233SToomas Soome #ifndef _X86_SEGMENTS_H_ 37*9c8f3233SToomas Soome #define _X86_SEGMENTS_H_ 38*9c8f3233SToomas Soome 39*9c8f3233SToomas Soome /* 40*9c8f3233SToomas Soome * X86 Segmentation Data Structures and definitions 41*9c8f3233SToomas Soome */ 42*9c8f3233SToomas Soome 43*9c8f3233SToomas Soome /* 44*9c8f3233SToomas Soome * Selectors 45*9c8f3233SToomas Soome */ 46*9c8f3233SToomas Soome #define SEL_RPL_MASK 3 /* requester priv level */ 47*9c8f3233SToomas Soome #define ISPL(s) ((s)&3) /* priority level of a selector */ 48*9c8f3233SToomas Soome #define SEL_KPL 0 /* kernel priority level */ 49*9c8f3233SToomas Soome #define SEL_UPL 3 /* user priority level */ 50*9c8f3233SToomas Soome #define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */ 51*9c8f3233SToomas Soome #define SEL_LDT 4 /* local descriptor table */ 52*9c8f3233SToomas Soome #define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */ 53*9c8f3233SToomas Soome #define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */ 54*9c8f3233SToomas Soome #define GSEL(s,r) (((s)<<3) | r) /* a global selector */ 55*9c8f3233SToomas Soome 56*9c8f3233SToomas Soome /* 57*9c8f3233SToomas Soome * User segment descriptors (%cs, %ds etc for i386 apps. 64 bit wide) 58*9c8f3233SToomas Soome * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl, 59*9c8f3233SToomas Soome * sd_p, sd_l and sd_def32 which must be zero). %ds only has sd_p. 60*9c8f3233SToomas Soome */ 61*9c8f3233SToomas Soome struct segment_descriptor { 62*9c8f3233SToomas Soome unsigned sd_lolimit:16; /* segment extent (lsb) */ 63*9c8f3233SToomas Soome unsigned sd_lobase:24; /* segment base address (lsb) */ 64*9c8f3233SToomas Soome unsigned sd_type:5; /* segment type */ 65*9c8f3233SToomas Soome unsigned sd_dpl:2; /* segment descriptor priority level */ 66*9c8f3233SToomas Soome unsigned sd_p:1; /* segment descriptor present */ 67*9c8f3233SToomas Soome unsigned sd_hilimit:4; /* segment extent (msb) */ 68*9c8f3233SToomas Soome unsigned sd_xx:2; /* unused */ 69*9c8f3233SToomas Soome unsigned sd_def32:1; /* default 32 vs 16 bit size */ 70*9c8f3233SToomas Soome unsigned sd_gran:1; /* limit granularity (byte/page units)*/ 71*9c8f3233SToomas Soome unsigned sd_hibase:8; /* segment base address (msb) */ 72*9c8f3233SToomas Soome } __packed; 73*9c8f3233SToomas Soome 74*9c8f3233SToomas Soome struct user_segment_descriptor { 75*9c8f3233SToomas Soome unsigned sd_lolimit:16; /* segment extent (lsb) */ 76*9c8f3233SToomas Soome unsigned sd_lobase:24; /* segment base address (lsb) */ 77*9c8f3233SToomas Soome unsigned sd_type:5; /* segment type */ 78*9c8f3233SToomas Soome unsigned sd_dpl:2; /* segment descriptor priority level */ 79*9c8f3233SToomas Soome unsigned sd_p:1; /* segment descriptor present */ 80*9c8f3233SToomas Soome unsigned sd_hilimit:4; /* segment extent (msb) */ 81*9c8f3233SToomas Soome unsigned sd_xx:1; /* unused */ 82*9c8f3233SToomas Soome unsigned sd_long:1; /* long mode (cs only) */ 83*9c8f3233SToomas Soome unsigned sd_def32:1; /* default 32 vs 16 bit size */ 84*9c8f3233SToomas Soome unsigned sd_gran:1; /* limit granularity (byte/page units)*/ 85*9c8f3233SToomas Soome unsigned sd_hibase:8; /* segment base address (msb) */ 86*9c8f3233SToomas Soome } __packed; 87*9c8f3233SToomas Soome 88*9c8f3233SToomas Soome #define USD_GETBASE(sd) (((sd)->sd_lobase) | (sd)->sd_hibase << 24) 89*9c8f3233SToomas Soome #define USD_SETBASE(sd, b) (sd)->sd_lobase = (b); \ 90*9c8f3233SToomas Soome (sd)->sd_hibase = ((b) >> 24); 91*9c8f3233SToomas Soome #define USD_GETLIMIT(sd) (((sd)->sd_lolimit) | (sd)->sd_hilimit << 16) 92*9c8f3233SToomas Soome #define USD_SETLIMIT(sd, l) (sd)->sd_lolimit = (l); \ 93*9c8f3233SToomas Soome (sd)->sd_hilimit = ((l) >> 16); 94*9c8f3233SToomas Soome 95*9c8f3233SToomas Soome #ifdef __i386__ 96*9c8f3233SToomas Soome /* 97*9c8f3233SToomas Soome * Gate descriptors (e.g. indirect descriptors) 98*9c8f3233SToomas Soome */ 99*9c8f3233SToomas Soome struct gate_descriptor { 100*9c8f3233SToomas Soome unsigned gd_looffset:16; /* gate offset (lsb) */ 101*9c8f3233SToomas Soome unsigned gd_selector:16; /* gate segment selector */ 102*9c8f3233SToomas Soome unsigned gd_stkcpy:5; /* number of stack wds to cpy */ 103*9c8f3233SToomas Soome unsigned gd_xx:3; /* unused */ 104*9c8f3233SToomas Soome unsigned gd_type:5; /* segment type */ 105*9c8f3233SToomas Soome unsigned gd_dpl:2; /* segment descriptor priority level */ 106*9c8f3233SToomas Soome unsigned gd_p:1; /* segment descriptor present */ 107*9c8f3233SToomas Soome unsigned gd_hioffset:16; /* gate offset (msb) */ 108*9c8f3233SToomas Soome } __packed; 109*9c8f3233SToomas Soome 110*9c8f3233SToomas Soome /* 111*9c8f3233SToomas Soome * Generic descriptor 112*9c8f3233SToomas Soome */ 113*9c8f3233SToomas Soome union descriptor { 114*9c8f3233SToomas Soome struct segment_descriptor sd; 115*9c8f3233SToomas Soome struct gate_descriptor gd; 116*9c8f3233SToomas Soome }; 117*9c8f3233SToomas Soome #else 118*9c8f3233SToomas Soome /* 119*9c8f3233SToomas Soome * Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit) 120*9c8f3233SToomas Soome * Only interrupt and trap gates have gd_ist. 121*9c8f3233SToomas Soome */ 122*9c8f3233SToomas Soome struct gate_descriptor { 123*9c8f3233SToomas Soome uint64_t gd_looffset:16; /* gate offset (lsb) */ 124*9c8f3233SToomas Soome uint64_t gd_selector:16; /* gate segment selector */ 125*9c8f3233SToomas Soome uint64_t gd_ist:3; /* IST table index */ 126*9c8f3233SToomas Soome uint64_t gd_xx:5; /* unused */ 127*9c8f3233SToomas Soome uint64_t gd_type:5; /* segment type */ 128*9c8f3233SToomas Soome uint64_t gd_dpl:2; /* segment descriptor priority level */ 129*9c8f3233SToomas Soome uint64_t gd_p:1; /* segment descriptor present */ 130*9c8f3233SToomas Soome uint64_t gd_hioffset:48; /* gate offset (msb) */ 131*9c8f3233SToomas Soome uint64_t sd_xx1:32; 132*9c8f3233SToomas Soome } __packed; 133*9c8f3233SToomas Soome 134*9c8f3233SToomas Soome /* 135*9c8f3233SToomas Soome * Generic descriptor 136*9c8f3233SToomas Soome */ 137*9c8f3233SToomas Soome union descriptor { 138*9c8f3233SToomas Soome struct user_segment_descriptor sd; 139*9c8f3233SToomas Soome struct gate_descriptor gd; 140*9c8f3233SToomas Soome }; 141*9c8f3233SToomas Soome #endif 142*9c8f3233SToomas Soome 143*9c8f3233SToomas Soome /* system segments and gate types */ 144*9c8f3233SToomas Soome #define SDT_SYSNULL 0 /* system null */ 145*9c8f3233SToomas Soome #define SDT_SYS286TSS 1 /* system 286 TSS available */ 146*9c8f3233SToomas Soome #define SDT_SYSLDT 2 /* system local descriptor table */ 147*9c8f3233SToomas Soome #define SDT_SYS286BSY 3 /* system 286 TSS busy */ 148*9c8f3233SToomas Soome #define SDT_SYS286CGT 4 /* system 286 call gate */ 149*9c8f3233SToomas Soome #define SDT_SYSTASKGT 5 /* system task gate */ 150*9c8f3233SToomas Soome #define SDT_SYS286IGT 6 /* system 286 interrupt gate */ 151*9c8f3233SToomas Soome #define SDT_SYS286TGT 7 /* system 286 trap gate */ 152*9c8f3233SToomas Soome #define SDT_SYSNULL2 8 /* system null again */ 153*9c8f3233SToomas Soome #define SDT_SYS386TSS 9 /* system 386 TSS available */ 154*9c8f3233SToomas Soome #define SDT_SYSTSS 9 /* system available 64 bit TSS */ 155*9c8f3233SToomas Soome #define SDT_SYSNULL3 10 /* system null again */ 156*9c8f3233SToomas Soome #define SDT_SYS386BSY 11 /* system 386 TSS busy */ 157*9c8f3233SToomas Soome #define SDT_SYSBSY 11 /* system busy 64 bit TSS */ 158*9c8f3233SToomas Soome #define SDT_SYS386CGT 12 /* system 386 call gate */ 159*9c8f3233SToomas Soome #define SDT_SYSCGT 12 /* system 64 bit call gate */ 160*9c8f3233SToomas Soome #define SDT_SYSNULL4 13 /* system null again */ 161*9c8f3233SToomas Soome #define SDT_SYS386IGT 14 /* system 386 interrupt gate */ 162*9c8f3233SToomas Soome #define SDT_SYSIGT 14 /* system 64 bit interrupt gate */ 163*9c8f3233SToomas Soome #define SDT_SYS386TGT 15 /* system 386 trap gate */ 164*9c8f3233SToomas Soome #define SDT_SYSTGT 15 /* system 64 bit trap gate */ 165*9c8f3233SToomas Soome 166*9c8f3233SToomas Soome /* memory segment types */ 167*9c8f3233SToomas Soome #define SDT_MEMRO 16 /* memory read only */ 168*9c8f3233SToomas Soome #define SDT_MEMROA 17 /* memory read only accessed */ 169*9c8f3233SToomas Soome #define SDT_MEMRW 18 /* memory read write */ 170*9c8f3233SToomas Soome #define SDT_MEMRWA 19 /* memory read write accessed */ 171*9c8f3233SToomas Soome #define SDT_MEMROD 20 /* memory read only expand dwn limit */ 172*9c8f3233SToomas Soome #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */ 173*9c8f3233SToomas Soome #define SDT_MEMRWD 22 /* memory read write expand dwn limit */ 174*9c8f3233SToomas Soome #define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed*/ 175*9c8f3233SToomas Soome #define SDT_MEME 24 /* memory execute only */ 176*9c8f3233SToomas Soome #define SDT_MEMEA 25 /* memory execute only accessed */ 177*9c8f3233SToomas Soome #define SDT_MEMER 26 /* memory execute read */ 178*9c8f3233SToomas Soome #define SDT_MEMERA 27 /* memory execute read accessed */ 179*9c8f3233SToomas Soome #define SDT_MEMEC 28 /* memory execute only conforming */ 180*9c8f3233SToomas Soome #define SDT_MEMEAC 29 /* memory execute only accessed conforming */ 181*9c8f3233SToomas Soome #define SDT_MEMERC 30 /* memory execute read conforming */ 182*9c8f3233SToomas Soome #define SDT_MEMERAC 31 /* memory execute read accessed conforming */ 183*9c8f3233SToomas Soome 184*9c8f3233SToomas Soome /* 185*9c8f3233SToomas Soome * Size of IDT table 186*9c8f3233SToomas Soome */ 187*9c8f3233SToomas Soome #define NIDT 256 /* 32 reserved, 0x80 syscall, most are h/w */ 188*9c8f3233SToomas Soome #define NRSVIDT 32 /* reserved entries for cpu exceptions */ 189*9c8f3233SToomas Soome 190*9c8f3233SToomas Soome /* 191*9c8f3233SToomas Soome * Entries in the Interrupt Descriptor Table (IDT) 192*9c8f3233SToomas Soome */ 193*9c8f3233SToomas Soome #define IDT_DE 0 /* #DE: Divide Error */ 194*9c8f3233SToomas Soome #define IDT_DB 1 /* #DB: Debug */ 195*9c8f3233SToomas Soome #define IDT_NMI 2 /* Nonmaskable External Interrupt */ 196*9c8f3233SToomas Soome #define IDT_BP 3 /* #BP: Breakpoint */ 197*9c8f3233SToomas Soome #define IDT_OF 4 /* #OF: Overflow */ 198*9c8f3233SToomas Soome #define IDT_BR 5 /* #BR: Bound Range Exceeded */ 199*9c8f3233SToomas Soome #define IDT_UD 6 /* #UD: Undefined/Invalid Opcode */ 200*9c8f3233SToomas Soome #define IDT_NM 7 /* #NM: No Math Coprocessor */ 201*9c8f3233SToomas Soome #define IDT_DF 8 /* #DF: Double Fault */ 202*9c8f3233SToomas Soome #define IDT_FPUGP 9 /* Coprocessor Segment Overrun */ 203*9c8f3233SToomas Soome #define IDT_TS 10 /* #TS: Invalid TSS */ 204*9c8f3233SToomas Soome #define IDT_NP 11 /* #NP: Segment Not Present */ 205*9c8f3233SToomas Soome #define IDT_SS 12 /* #SS: Stack Segment Fault */ 206*9c8f3233SToomas Soome #define IDT_GP 13 /* #GP: General Protection Fault */ 207*9c8f3233SToomas Soome #define IDT_PF 14 /* #PF: Page Fault */ 208*9c8f3233SToomas Soome #define IDT_MF 16 /* #MF: FPU Floating-Point Error */ 209*9c8f3233SToomas Soome #define IDT_AC 17 /* #AC: Alignment Check */ 210*9c8f3233SToomas Soome #define IDT_MC 18 /* #MC: Machine Check */ 211*9c8f3233SToomas Soome #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ 212*9c8f3233SToomas Soome #define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ 213*9c8f3233SToomas Soome #define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ 214*9c8f3233SToomas Soome #define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */ 215*9c8f3233SToomas Soome #define IDT_EVTCHN 0x93 /* Xen HVM Event Channel Interrupt Vector */ 216*9c8f3233SToomas Soome 217*9c8f3233SToomas Soome #if defined(__i386__) 218*9c8f3233SToomas Soome /* 219*9c8f3233SToomas Soome * Entries in the Global Descriptor Table (GDT) 220*9c8f3233SToomas Soome * Note that each 4 entries share a single 32 byte L1 cache line. 221*9c8f3233SToomas Soome * Some of the fast syscall instructions require a specific order here. 222*9c8f3233SToomas Soome */ 223*9c8f3233SToomas Soome #define GNULL_SEL 0 /* Null Descriptor */ 224*9c8f3233SToomas Soome #define GPRIV_SEL 1 /* SMP Per-Processor Private Data */ 225*9c8f3233SToomas Soome #define GUFS_SEL 2 /* User %fs Descriptor (order critical: 1) */ 226*9c8f3233SToomas Soome #define GUGS_SEL 3 /* User %gs Descriptor (order critical: 2) */ 227*9c8f3233SToomas Soome #define GCODE_SEL 4 /* Kernel Code Descriptor (order critical: 1) */ 228*9c8f3233SToomas Soome #define GDATA_SEL 5 /* Kernel Data Descriptor (order critical: 2) */ 229*9c8f3233SToomas Soome #define GUCODE_SEL 6 /* User Code Descriptor (order critical: 3) */ 230*9c8f3233SToomas Soome #define GUDATA_SEL 7 /* User Data Descriptor (order critical: 4) */ 231*9c8f3233SToomas Soome #define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */ 232*9c8f3233SToomas Soome #define GPROC0_SEL 9 /* Task state process slot zero and up */ 233*9c8f3233SToomas Soome #define GLDT_SEL 10 /* Default User LDT */ 234*9c8f3233SToomas Soome #define GUSERLDT_SEL 11 /* User LDT */ 235*9c8f3233SToomas Soome #define GPANIC_SEL 12 /* Task state to consider panic from */ 236*9c8f3233SToomas Soome #define GBIOSCODE32_SEL 13 /* BIOS interface (32bit Code) */ 237*9c8f3233SToomas Soome #define GBIOSCODE16_SEL 14 /* BIOS interface (16bit Code) */ 238*9c8f3233SToomas Soome #define GBIOSDATA_SEL 15 /* BIOS interface (Data) */ 239*9c8f3233SToomas Soome #define GBIOSUTIL_SEL 16 /* BIOS interface (Utility) */ 240*9c8f3233SToomas Soome #define GBIOSARGS_SEL 17 /* BIOS interface (Arguments) */ 241*9c8f3233SToomas Soome #define GNDIS_SEL 18 /* For the NDIS layer */ 242*9c8f3233SToomas Soome #define NGDT 19 243*9c8f3233SToomas Soome 244*9c8f3233SToomas Soome /* 245*9c8f3233SToomas Soome * Entries in the Local Descriptor Table (LDT) 246*9c8f3233SToomas Soome */ 247*9c8f3233SToomas Soome #define LSYS5CALLS_SEL 0 /* forced by intel BCS */ 248*9c8f3233SToomas Soome #define LSYS5SIGR_SEL 1 249*9c8f3233SToomas Soome #define LUCODE_SEL 3 250*9c8f3233SToomas Soome #define LUDATA_SEL 5 251*9c8f3233SToomas Soome #define NLDT (LUDATA_SEL + 1) 252*9c8f3233SToomas Soome 253*9c8f3233SToomas Soome #else /* !__i386__ */ 254*9c8f3233SToomas Soome /* 255*9c8f3233SToomas Soome * Entries in the Global Descriptor Table (GDT) 256*9c8f3233SToomas Soome */ 257*9c8f3233SToomas Soome #define GNULL_SEL 0 /* Null Descriptor */ 258*9c8f3233SToomas Soome #define GNULL2_SEL 1 /* Null Descriptor */ 259*9c8f3233SToomas Soome #define GUFS32_SEL 2 /* User 32 bit %fs Descriptor */ 260*9c8f3233SToomas Soome #define GUGS32_SEL 3 /* User 32 bit %gs Descriptor */ 261*9c8f3233SToomas Soome #define GCODE_SEL 4 /* Kernel Code Descriptor */ 262*9c8f3233SToomas Soome #define GDATA_SEL 5 /* Kernel Data Descriptor */ 263*9c8f3233SToomas Soome #define GUCODE32_SEL 6 /* User 32 bit code Descriptor */ 264*9c8f3233SToomas Soome #define GUDATA_SEL 7 /* User 32/64 bit Data Descriptor */ 265*9c8f3233SToomas Soome #define GUCODE_SEL 8 /* User 64 bit Code Descriptor */ 266*9c8f3233SToomas Soome #define GPROC0_SEL 9 /* TSS for entering kernel etc */ 267*9c8f3233SToomas Soome /* slot 10 is second half of GPROC0_SEL */ 268*9c8f3233SToomas Soome #define GUSERLDT_SEL 11 /* LDT */ 269*9c8f3233SToomas Soome /* slot 12 is second half of GUSERLDT_SEL */ 270*9c8f3233SToomas Soome #define NGDT 13 271*9c8f3233SToomas Soome #endif /* __i386__ */ 272*9c8f3233SToomas Soome 273*9c8f3233SToomas Soome #endif /* !_X86_SEGMENTS_H_ */ 274