sys/cpu/x86_64/include/segments.h

   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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  *
  38  *      from: @(#)segments.h    7.1 (Berkeley) 5/9/91
  39  * $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $
  40  */
  41
  42 #ifndef _CPU_SEGMENTS_H_
  43 #define _CPU_SEGMENTS_H_
  44
  45 /*
  46  * x86_64 Segmentation Data Structures and definitions
  47  */
  48
  49 /*
  50  * Selectors
  51  */
  52
  53 #define SEL_RPL_MASK    3       /* requester priv level */
  54 #define ISPL(s) ((s)&3)         /* what is the privilege level of a selector */
  55 #define SEL_KPL 0               /* kernel privilege level */
  56 #define SEL_UPL 3               /* user privilege level */
  57 #define ISLDT(s)        ((s)&SEL_LDT)   /* is it local or global */
  58 #define SEL_LDT 4               /* local descriptor table */
  59 #define IDXSEL(s)       (((s)>>3) & 0x1fff)             /* index of selector */
  60 #define LSEL(s,r)       (((s)<<3) | SEL_LDT | r)        /* a local selector */
  61 #define GSEL(s,r)       (((s)<<3) | r)                  /* a global selector */
  62
  63 #ifndef LOCORE
  64
  65 /*
  66  * User segment descriptors (%cs, %ds etc for compatability apps. 64 bit wide)
  67  * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl,
  68  * sd_p, sd_l and sd_def32 which must be zero).  %ds only has sd_p.
  69  */
  70 struct  user_segment_descriptor {
  71         u_int64_t sd_lolimit:16;        /* segment extent (lsb) */
  72         u_int64_t sd_lobase:24;         /* segment base address (lsb) */
  73         u_int64_t sd_type:5;            /* segment type */
  74         u_int64_t sd_dpl:2;             /* segment descriptor priority level */
  75         u_int64_t sd_p:1;               /* segment descriptor present */
  76         u_int64_t sd_hilimit:4;         /* segment extent (msb) */
  77         u_int64_t sd_xx:1;              /* unused */
  78         u_int64_t sd_long:1;            /* long mode (cs only) */
  79         u_int64_t sd_def32:1;           /* default 32 vs 16 bit size */
  80         u_int64_t sd_gran:1;            /* limit granularity (byte/page units)*/
  81         u_int64_t sd_hibase:8;          /* segment base address  (msb) */
  82 } __packed;
  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 #endif /* LOCORE */
 119
 120 /* system segments and gate types */
 121 #define SDT_SYSNULL      0      /* system null */
 122 #define SDT_SYSLDT       2      /* system 64-bit local descriptor table */
 123 #define SDT_SYSTSS       9      /* system available 64-bit TSS */
 124 #define SDT_SYSBSY      11      /* system busy 64-bit TSS */
 125 #define SDT_SYSCGT      12      /* system 64-bit call gate */
 126 #define SDT_SYSIGT      14      /* system 64-bit interrupt gate */
 127 #define SDT_SYSTGT      15      /* system 64-bit trap gate */
 128
 129         /* memory segment types */
 130 #define SDT_MEMRO       16      /* memory read only */
 131 #define SDT_MEMROA      17      /* memory read only accessed */
 132 #define SDT_MEMRW       18      /* memory read write */
 133 #define SDT_MEMRWA      19      /* memory read write accessed */
 134 #define SDT_MEMROD      20      /* memory read only expand dwn limit */
 135 #define SDT_MEMRODA     21      /* memory read only expand dwn limit accessed */
 136 #define SDT_MEMRWD      22      /* memory read write expand dwn limit */
 137 #define SDT_MEMRWDA     23      /* memory read write expand dwn limit accessed */
 138 #define SDT_MEME        24      /* memory execute only */
 139 #define SDT_MEMEA       25      /* memory execute only accessed */
 140 #define SDT_MEMER       26      /* memory execute read */
 141 #define SDT_MEMERA      27      /* memory execute read accessed */
 142 #define SDT_MEMEC       28      /* memory execute only conforming */
 143 #define SDT_MEMEAC      29      /* memory execute only accessed conforming */
 144 #define SDT_MEMERC      30      /* memory execute read conforming */
 145 #define SDT_MEMERAC     31      /* memory execute read accessed conforming */
 146
 147
 148 #ifndef LOCORE
 149
 150 #ifndef _SYS_TLS_H_
 151 #include <sys/tls.h>
 152 #endif
 153
 154 struct savetls {
 155         struct tls_info info[2];
 156 };
 157
 158 /* is memory segment descriptor pointer ? */
 159 #define ISMEMSDP(s)     ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC)
 160
 161 /* is 286 gate descriptor pointer ? */
 162 #define IS286GDP(s)     (((s->d_type) >= SDT_SYS286CGT \
 163                                  && (s->d_type) < SDT_SYS286TGT))
 164
 165 /* is 386 gate descriptor pointer ? */
 166 #define IS386GDP(s)     (((s->d_type) >= SDT_SYS386CGT \
 167                                 && (s->d_type) < SDT_SYS386TGT))
 168
 169 /* is gate descriptor pointer ? */
 170 #define ISGDP(s)        (IS286GDP(s) || IS386GDP(s))
 171
 172 /* is segment descriptor pointer ? */
 173 #define ISSDP(s)        (ISMEMSDP(s) || !ISGDP(s))
 174
 175 /* is system segment descriptor pointer ? */
 176 #define ISSYSSDP(s)     (!ISMEMSDP(s) && !ISGDP(s))
 177
 178 /*
 179  * Software definitions are in this convenient format,
 180  * which are translated into inconvenient segment descriptors
 181  * when needed to be used by the 386 hardware
 182  */
 183
 184 struct  soft_segment_descriptor {
 185         uint64_t ssd_base;              /* segment base address  */
 186         uint64_t ssd_limit;     /* segment extent */
 187         uint64_t ssd_type:5;    /* segment type */
 188         uint64_t ssd_dpl:2;     /* segment descriptor priority level */
 189         uint64_t ssd_p:1;               /* segment descriptor present */
 190         uint64_t ssd_long:1;    /* long mode (for %cs) */
 191         uint64_t ssd_def32:1;   /* default 32 vs 16 bit size */
 192         uint64_t ssd_gran:1;    /* limit granularity (byte/page units)*/
 193 } __packed;
 194
 195 /*
 196  * region descriptors, used to load gdt/idt tables before segments yet exist.
 197  */
 198 struct region_descriptor {
 199         uint64_t rd_limit:16;           /* segment extent */
 200         uint64_t rd_base:64 __packed;   /* base address  */
 201 } __packed;
 202
 203 #endif /* LOCORE */
 204
 205 /*
 206  * Segment Protection Exception code bits
 207  */
 208
 209 #define SEGEX_EXT       0x01    /* recursive or externally induced */
 210 #define SEGEX_IDT       0x02    /* interrupt descriptor table */
 211 #define SEGEX_TI        0x04    /* local descriptor table */
 212                                 /* other bits are affected descriptor index */
 213 #define SEGEX_IDX(s)    ((s)>>3)&0x1fff)
 214
 215 /*
 216  * Size of the IDT table.  Theoretically we only need to cover past 0x81
 217  * (NIDT=130) if not running APIC_IO or SMP, but at this point we might
 218  * as well just use all of them.
 219  */
 220 #define NIDT    256             /* we use them all */
 221 /*
 222  * Entries in the Interrupt Descriptor Table (IDT)
 223  */
 224 #define IDT_DE          0       /* #DE: Divide Error */
 225 #define IDT_DB          1       /* #DB: Debug */
 226 #define IDT_NMI         2       /* Nonmaskable External Interrupt */
 227 #define IDT_BP          3       /* #BP: Breakpoint */
 228 #define IDT_OF          4       /* #OF: Overflow */
 229 #define IDT_BR          5       /* #BR: Bound Range Exceeded */
 230 #define IDT_UD          6       /* #UD: Undefined/Invalid Opcode */
 231 #define IDT_NM          7       /* #NM: No Math Coprocessor */
 232 #define IDT_DF          8       /* #DF: Double Fault */
 233 #define IDT_FPUGP       9       /* Coprocessor Segment Overrun */
 234 #define IDT_TS          10      /* #TS: Invalid TSS */
 235 #define IDT_NP          11      /* #NP: Segment Not Present */
 236 #define IDT_SS          12      /* #SS: Stack Segment Fault */
 237 #define IDT_GP          13      /* #GP: General Protection Fault */
 238 #define IDT_PF          14      /* #PF: Page Fault */
 239 #define IDT_MF          16      /* #MF: FPU Floating-Point Error */
 240 #define IDT_AC          17      /* #AC: Alignment Check */
 241 #define IDT_MC          18      /* #MC: Machine Check */
 242 #define IDT_XF          19      /* #XF: SIMD Floating-Point Exception */
 243 #define IDT_IO_INTS     NRSVIDT /* Base of IDT entries for I/O interrupts. */
 244 #define IDT_SYSCALL     0x80    /* System Call Interrupt Vector */
 245
 246 /*
 247  * Entries in the Global Descriptor Table (GDT)
 248  */
 249 #define GNULL_SEL       0       /* Null Descriptor */
 250 #define GCODE_SEL       1       /* Kernel Code Descriptor */
 251 #define GDATA_SEL       2       /* Kernel Data Descriptor */
 252 #define GUCODE32_SEL    3       /* User 32 bit code Descriptor */
 253 #define GUDATA_SEL      4       /* User 32/64 bit Data Descriptor */
 254 #define GUCODE_SEL      5       /* User 64 bit Code Descriptor */
 255 #define GPROC0_SEL      6       /* TSS for entering kernel etc */
 256 /* slot 7 is second half of GPROC0_SEL */
 257 #define GUGS32_SEL      8       /* User 32 bit GS Descriptor */
 258 #define NGDT            9
 259
 260 #ifndef LOCORE
 261
 262 #ifdef _KERNEL
 263 extern struct user_segment_descriptor gdt[];
 264 extern struct soft_segment_descriptor gdt_segs[];
 265 extern struct gate_descriptor *idt;
 266
 267 void    lgdt(struct region_descriptor *rdp);
 268 void    sdtossd(struct user_segment_descriptor *sdp,
 269             struct soft_segment_descriptor *ssdp);
 270 void    ssdtosd(struct soft_segment_descriptor *ssdp,
 271             struct user_segment_descriptor *sdp);
 272 void    ssdtosyssd(struct soft_segment_descriptor *ssdp,
 273             struct system_segment_descriptor *sdp);
 274 #endif /* _KERNEL */
 275 #endif /* LOCORE */
 276
 277 #endif /* !_CPU_SEGMENTS_H_ */