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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      from: @(#)segments.h    7.1 (Berkeley) 5/9/91
  35  * $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $
  36  */
  37
  38 #ifndef _CPU_SEGMENTS_H_
  39 #define _CPU_SEGMENTS_H_
  40
  41 /*
  42  * x86_64 Segmentation Data Structures and definitions
  43  */
  44
  45 /*
  46  * Selectors
  47  */
  48
  49 #define SEL_RPL_MASK    3       /* requester priv level */
  50 #define ISPL(s) ((s)&3)         /* what is the privilege level of a selector */
  51 #define SEL_KPL 0               /* kernel privilege level */
  52 #define SEL_UPL 3               /* user privilege level */
  53 #define ISLDT(s)        ((s)&SEL_LDT)   /* is it local or global */
  54 #define SEL_LDT 4               /* local descriptor table */
  55 #define IDXSEL(s)       (((s)>>3) & 0x1fff)             /* index of selector */
  56 #define LSEL(s,r)       (((s)<<3) | SEL_LDT | r)        /* a local selector */
  57 #define GSEL(s,r)       (((s)<<3) | r)                  /* a global selector */
  58
  59 #ifndef LOCORE
  60
  61 /*
  62  * User segment descriptors (%cs, %ds etc for compatibility apps. 64 bit wide)
  63  * For long-mode apps, %cs only has the conforming bit in sd_type, the sd_dpl,
  64  * sd_p, sd_l and sd_def32 which must be zero).  %ds only has sd_p.
  65  */
  66 struct  user_segment_descriptor {
  67         u_int64_t sd_lolimit:16;        /* segment extent (lsb) */
  68         u_int64_t sd_lobase:24;         /* segment base address (lsb) */
  69         u_int64_t sd_type:5;            /* segment type */
  70         u_int64_t sd_dpl:2;             /* segment descriptor priority level */
  71         u_int64_t sd_p:1;               /* segment descriptor present */
  72         u_int64_t sd_hilimit:4;         /* segment extent (msb) */
  73         u_int64_t sd_xx:1;              /* unused */
  74         u_int64_t sd_long:1;            /* long mode (cs only) */
  75         u_int64_t sd_def32:1;           /* default 32 vs 16 bit size */
  76         u_int64_t sd_gran:1;            /* limit granularity (byte/page units)*/
  77         u_int64_t sd_hibase:8;          /* segment base address  (msb) */
  78 } __packed;
  79
  80 /*
  81  * System segment descriptors (128 bit wide)
  82  */
  83 struct  system_segment_descriptor {
  84         u_int64_t sd_lolimit:16;        /* segment extent (lsb) */
  85         u_int64_t sd_lobase:24;         /* segment base address (lsb) */
  86         u_int64_t sd_type:5;            /* segment type */
  87         u_int64_t sd_dpl:2;             /* segment descriptor priority level */
  88         u_int64_t sd_p:1;               /* segment descriptor present */
  89         u_int64_t sd_hilimit:4;         /* segment extent (msb) */
  90         u_int64_t sd_xx0:3;             /* unused */
  91         u_int64_t sd_gran:1;            /* limit granularity (byte/page units)*/
  92         u_int64_t sd_hibase:40 __packed;/* segment base address  (msb) */
  93         u_int64_t sd_xx1:8;
  94         u_int64_t sd_mbz:5;             /* MUST be zero */
  95         u_int64_t sd_xx2:19;
  96 } __packed;
  97
  98 /*
  99  * Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit)
 100  * Only interrupt and trap gates have gd_ist.
 101  */
 102 struct  gate_descriptor {
 103         u_int64_t gd_looffset:16;       /* gate offset (lsb) */
 104         u_int64_t gd_selector:16;       /* gate segment selector */
 105         u_int64_t gd_ist:3;             /* IST table index */
 106         u_int64_t gd_xx:5;              /* unused */
 107         u_int64_t gd_type:5;            /* segment type */
 108         u_int64_t gd_dpl:2;             /* segment descriptor priority level */
 109         u_int64_t gd_p:1;               /* segment descriptor present */
 110         u_int64_t gd_hioffset:48 __packed;      /* gate offset (msb) */
 111         u_int64_t sd_xx1:32;
 112 } __packed;
 113
 114 #endif /* LOCORE */
 115
 116 /* system segments and gate types */
 117 #define SDT_SYSNULL      0      /* system null */
 118 #define SDT_SYSLDT       2      /* system 64-bit local descriptor table */
 119 #define SDT_SYSTSS       9      /* system available 64-bit TSS */
 120 #define SDT_SYSBSY      11      /* system busy 64-bit TSS */
 121 #define SDT_SYSCGT      12      /* system 64-bit call gate */
 122 #define SDT_SYSIGT      14      /* system 64-bit interrupt gate */
 123 #define SDT_SYSTGT      15      /* system 64-bit trap gate */
 124
 125         /* memory segment types */
 126 #define SDT_MEMRO       16      /* memory read only */
 127 #define SDT_MEMROA      17      /* memory read only accessed */
 128 #define SDT_MEMRW       18      /* memory read write */
 129 #define SDT_MEMRWA      19      /* memory read write accessed */
 130 #define SDT_MEMROD      20      /* memory read only expand dwn limit */
 131 #define SDT_MEMRODA     21      /* memory read only expand dwn limit accessed */
 132 #define SDT_MEMRWD      22      /* memory read write expand dwn limit */
 133 #define SDT_MEMRWDA     23      /* memory read write expand dwn limit accessed */
 134 #define SDT_MEME        24      /* memory execute only */
 135 #define SDT_MEMEA       25      /* memory execute only accessed */
 136 #define SDT_MEMER       26      /* memory execute read */
 137 #define SDT_MEMERA      27      /* memory execute read accessed */
 138 #define SDT_MEMEC       28      /* memory execute only conforming */
 139 #define SDT_MEMEAC      29      /* memory execute only accessed conforming */
 140 #define SDT_MEMERC      30      /* memory execute read conforming */
 141 #define SDT_MEMERAC     31      /* memory execute read accessed conforming */
 142
 143
 144 #ifndef LOCORE
 145
 146 #ifndef _SYS_TLS_H_
 147 #include <sys/tls.h>
 148 #endif
 149
 150 struct savetls {
 151         struct tls_info info[2];
 152 };
 153
 154 /* is memory segment descriptor pointer ? */
 155 #define ISMEMSDP(s)     ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC)
 156
 157 /* is 286 gate descriptor pointer ? */
 158 #define IS286GDP(s)     (((s->d_type) >= SDT_SYS286CGT \
 159                                  && (s->d_type) < SDT_SYS286TGT))
 160
 161 /* is 386 gate descriptor pointer ? */
 162 #define IS386GDP(s)     (((s->d_type) >= SDT_SYS386CGT \
 163                                 && (s->d_type) < SDT_SYS386TGT))
 164
 165 /* is gate descriptor pointer ? */
 166 #define ISGDP(s)        (IS286GDP(s) || IS386GDP(s))
 167
 168 /* is segment descriptor pointer ? */
 169 #define ISSDP(s)        (ISMEMSDP(s) || !ISGDP(s))
 170
 171 /* is system segment descriptor pointer ? */
 172 #define ISSYSSDP(s)     (!ISMEMSDP(s) && !ISGDP(s))
 173
 174 /*
 175  * Software definitions are in this convenient format,
 176  * which are translated into inconvenient segment descriptors
 177  * when needed to be used by the 386 hardware
 178  */
 179
 180 struct  soft_segment_descriptor {
 181         uint64_t ssd_base;              /* segment base address  */
 182         uint64_t ssd_limit;     /* segment extent */
 183         uint64_t ssd_type:5;    /* segment type */
 184         uint64_t ssd_dpl:2;     /* segment descriptor priority level */
 185         uint64_t ssd_p:1;               /* segment descriptor present */
 186         uint64_t ssd_long:1;    /* long mode (for %cs) */
 187         uint64_t ssd_def32:1;   /* default 32 vs 16 bit size */
 188         uint64_t ssd_gran:1;    /* limit granularity (byte/page units)*/
 189 } __packed;
 190
 191 /*
 192  * region descriptors, used to load gdt/idt tables before segments yet exist.
 193  */
 194 struct region_descriptor {
 195         uint64_t rd_limit:16;           /* segment extent */
 196         uint64_t rd_base:64 __packed;   /* base address  */
 197 } __packed;
 198
 199 #endif /* LOCORE */
 200
 201 /*
 202  * Segment Protection Exception code bits
 203  */
 204
 205 #define SEGEX_EXT       0x01    /* recursive or externally induced */
 206 #define SEGEX_IDT       0x02    /* interrupt descriptor table */
 207 #define SEGEX_TI        0x04    /* local descriptor table */
 208                                 /* other bits are affected descriptor index */
 209 #define SEGEX_IDX(s)    (((s)>>3)&0x1fff)
 210
 211 /*
 212  * Size of the IDT table.
 213  */
 214 #define NIDT    256             /* we use them all */
 215 /*
 216  * Entries in the Interrupt Descriptor Table (IDT)
 217  */
 218 #define IDT_DE          0       /* #DE: Divide Error */
 219 #define IDT_DB          1       /* #DB: Debug */
 220 #define IDT_NMI         2       /* Nonmaskable External Interrupt */
 221 #define IDT_BP          3       /* #BP: Breakpoint */
 222 #define IDT_OF          4       /* #OF: Overflow */
 223 #define IDT_BR          5       /* #BR: Bound Range Exceeded */
 224 #define IDT_UD          6       /* #UD: Undefined/Invalid Opcode */
 225 #define IDT_NM          7       /* #NM: No Math Coprocessor */
 226 #define IDT_DF          8       /* #DF: Double Fault */
 227 #define IDT_FPUGP       9       /* Coprocessor Segment Overrun */
 228 #define IDT_TS          10      /* #TS: Invalid TSS */
 229 #define IDT_NP          11      /* #NP: Segment Not Present */
 230 #define IDT_SS          12      /* #SS: Stack Segment Fault */
 231 #define IDT_GP          13      /* #GP: General Protection Fault */
 232 #define IDT_PF          14      /* #PF: Page Fault */
 233 #define IDT_MF          16      /* #MF: FPU Floating-Point Error */
 234 #define IDT_AC          17      /* #AC: Alignment Check */
 235 #define IDT_MC          18      /* #MC: Machine Check */
 236 #define IDT_XF          19      /* #XF: SIMD Floating-Point Exception */
 237 #define IDT_IO_INTS     NRSVIDT /* Base of IDT entries for I/O interrupts. */
 238 #define IDT_SYSCALL     0x80    /* System Call Interrupt Vector */
 239
 240 /*
 241  * Entries in the Global Descriptor Table (GDT)
 242  */
 243 #define GNULL_SEL       0       /* Null Descriptor */
 244 #define GCODE_SEL       1       /* Kernel Code Descriptor */
 245 #define GDATA_SEL       2       /* Kernel Data Descriptor */
 246 #define GUCODE32_SEL    3       /* User 32 bit code Descriptor */
 247 #define GUDATA_SEL      4       /* User 32/64 bit Data Descriptor */
 248 #define GUCODE_SEL      5       /* User 64 bit Code Descriptor */
 249 #define GPROC0_SEL      6       /* TSS for entering kernel etc */
 250 /* slot 7 is second half of GPROC0_SEL */
 251 #define GUGS32_SEL      8       /* User 32 bit GS Descriptor */
 252 #define NGDT            9
 253
 254 #ifndef LOCORE
 255
 256 #ifdef _KERNEL
 257 extern struct user_segment_descriptor gdt[];
 258 extern struct soft_segment_descriptor gdt_segs[];
 259 extern struct gate_descriptor idt_arr[MAXCPU][NIDT];
 260 extern struct region_descriptor r_idt_arr[];
 261 extern struct mtx dt_lock;
 262
 263 void    lgdt(struct region_descriptor *rdp);
 264 void    sdtossd(struct user_segment_descriptor *sdp,
 265             struct soft_segment_descriptor *ssdp);
 266 void    ssdtosd(struct soft_segment_descriptor *ssdp,
 267             struct user_segment_descriptor *sdp);
 268 void    ssdtosyssd(struct soft_segment_descriptor *ssdp,
 269             struct system_segment_descriptor *sdp);
 270 #endif /* _KERNEL */
 271 #endif /* LOCORE */
 272
 273 #endif /* !_CPU_SEGMENTS_H_ */