usr/src/boot/sys/x86/include/segments.h

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