The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/x86/include/segments.h

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    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  * 4. 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  * $FreeBSD: releng/10.0/sys/x86/include/segments.h 255040 2013-08-29 19:52:18Z gibbs $
   35  */
   36 
   37 #ifndef _X86_SEGMENTS_H_
   38 #define _X86_SEGMENTS_H_
   39 
   40 /*
   41  * X86 Segmentation Data Structures and definitions
   42  */
   43 
   44 /*
   45  * Selectors
   46  */
   47 #define SEL_RPL_MASK    3               /* requester priv level */
   48 #define ISPL(s)         ((s)&3)         /* priority level of a selector */
   49 #ifdef XEN
   50 #define SEL_KPL         1               /* kernel priority level */
   51 #else
   52 #define SEL_KPL         0               /* kernel priority level */
   53 #endif
   54 #define SEL_UPL         3               /* user priority level */
   55 #define ISLDT(s)        ((s)&SEL_LDT)   /* is it local or global */
   56 #define SEL_LDT         4               /* local descriptor table */
   57 #define IDXSEL(s)       (((s)>>3) & 0x1fff) /* index of selector */
   58 #define LSEL(s,r)       (((s)<<3) | SEL_LDT | r) /* a local selector */
   59 #define GSEL(s,r)       (((s)<<3) | r)  /* a global selector */
   60 
   61 /*
   62  * User segment descriptors (%cs, %ds etc for i386 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 segment_descriptor {
   67         unsigned sd_lolimit:16;         /* segment extent (lsb) */
   68         unsigned sd_lobase:24;          /* segment base address (lsb) */
   69         unsigned sd_type:5;             /* segment type */
   70         unsigned sd_dpl:2;              /* segment descriptor priority level */
   71         unsigned sd_p:1;                /* segment descriptor present */
   72         unsigned sd_hilimit:4;          /* segment extent (msb) */
   73         unsigned sd_xx:2;               /* unused */
   74         unsigned sd_def32:1;            /* default 32 vs 16 bit size */
   75         unsigned sd_gran:1;             /* limit granularity (byte/page units)*/
   76         unsigned sd_hibase:8;           /* segment base address  (msb) */
   77 } __packed;
   78 
   79 struct user_segment_descriptor {
   80         unsigned sd_lolimit:16;         /* segment extent (lsb) */
   81         unsigned sd_lobase:24;          /* segment base address (lsb) */
   82         unsigned sd_type:5;             /* segment type */
   83         unsigned sd_dpl:2;              /* segment descriptor priority level */
   84         unsigned sd_p:1;                /* segment descriptor present */
   85         unsigned sd_hilimit:4;          /* segment extent (msb) */
   86         unsigned sd_xx:1;               /* unused */
   87         unsigned sd_long:1;             /* long mode (cs only) */
   88         unsigned sd_def32:1;            /* default 32 vs 16 bit size */
   89         unsigned sd_gran:1;             /* limit granularity (byte/page units)*/
   90         unsigned sd_hibase:8;           /* segment base address  (msb) */
   91 } __packed;
   92 
   93 #define USD_GETBASE(sd)         (((sd)->sd_lobase) | (sd)->sd_hibase << 24)
   94 #define USD_SETBASE(sd, b)      (sd)->sd_lobase = (b);  \
   95                                 (sd)->sd_hibase = ((b) >> 24);
   96 #define USD_GETLIMIT(sd)        (((sd)->sd_lolimit) | (sd)->sd_hilimit << 16)
   97 #define USD_SETLIMIT(sd, l)     (sd)->sd_lolimit = (l); \
   98                                 (sd)->sd_hilimit = ((l) >> 16);
   99 
  100 #ifdef __i386__
  101 /*
  102  * Gate descriptors (e.g. indirect descriptors)
  103  */
  104 struct gate_descriptor {
  105         unsigned gd_looffset:16;        /* gate offset (lsb) */
  106         unsigned gd_selector:16;        /* gate segment selector */
  107         unsigned gd_stkcpy:5;           /* number of stack wds to cpy */
  108         unsigned gd_xx:3;               /* unused */
  109         unsigned gd_type:5;             /* segment type */
  110         unsigned gd_dpl:2;              /* segment descriptor priority level */
  111         unsigned gd_p:1;                /* segment descriptor present */
  112         unsigned gd_hioffset:16;        /* gate offset (msb) */
  113 } __packed;
  114 
  115 /*
  116  * Generic descriptor
  117  */
  118 union descriptor {
  119         struct segment_descriptor sd;
  120         struct gate_descriptor gd;
  121 };
  122 #else
  123 /*
  124  * Gate descriptors (e.g. indirect descriptors, trap, interrupt etc. 128 bit)
  125  * Only interrupt and trap gates have gd_ist.
  126  */
  127 struct gate_descriptor {
  128         uint64_t gd_looffset:16;        /* gate offset (lsb) */
  129         uint64_t gd_selector:16;        /* gate segment selector */
  130         uint64_t gd_ist:3;              /* IST table index */
  131         uint64_t gd_xx:5;               /* unused */
  132         uint64_t gd_type:5;             /* segment type */
  133         uint64_t gd_dpl:2;              /* segment descriptor priority level */
  134         uint64_t gd_p:1;                /* segment descriptor present */
  135         uint64_t gd_hioffset:48;        /* gate offset (msb) */
  136         uint64_t sd_xx1:32;
  137 } __packed;
  138 
  139 /*
  140  * Generic descriptor
  141  */
  142 union descriptor {
  143         struct user_segment_descriptor sd;
  144         struct gate_descriptor gd;
  145 };
  146 #endif
  147 
  148         /* system segments and gate types */
  149 #define SDT_SYSNULL      0      /* system null */
  150 #define SDT_SYS286TSS    1      /* system 286 TSS available */
  151 #define SDT_SYSLDT       2      /* system local descriptor table */
  152 #define SDT_SYS286BSY    3      /* system 286 TSS busy */
  153 #define SDT_SYS286CGT    4      /* system 286 call gate */
  154 #define SDT_SYSTASKGT    5      /* system task gate */
  155 #define SDT_SYS286IGT    6      /* system 286 interrupt gate */
  156 #define SDT_SYS286TGT    7      /* system 286 trap gate */
  157 #define SDT_SYSNULL2     8      /* system null again */
  158 #define SDT_SYS386TSS    9      /* system 386 TSS available */
  159 #define SDT_SYSTSS       9      /* system available 64 bit TSS */
  160 #define SDT_SYSNULL3    10      /* system null again */
  161 #define SDT_SYS386BSY   11      /* system 386 TSS busy */
  162 #define SDT_SYSBSY      11      /* system busy 64 bit TSS */
  163 #define SDT_SYS386CGT   12      /* system 386 call gate */
  164 #define SDT_SYSCGT      12      /* system 64 bit call gate */
  165 #define SDT_SYSNULL4    13      /* system null again */
  166 #define SDT_SYS386IGT   14      /* system 386 interrupt gate */
  167 #define SDT_SYSIGT      14      /* system 64 bit interrupt gate */
  168 #define SDT_SYS386TGT   15      /* system 386 trap gate */
  169 #define SDT_SYSTGT      15      /* system 64 bit trap gate */
  170 
  171         /* memory segment types */
  172 #define SDT_MEMRO       16      /* memory read only */
  173 #define SDT_MEMROA      17      /* memory read only accessed */
  174 #define SDT_MEMRW       18      /* memory read write */
  175 #define SDT_MEMRWA      19      /* memory read write accessed */
  176 #define SDT_MEMROD      20      /* memory read only expand dwn limit */
  177 #define SDT_MEMRODA     21      /* memory read only expand dwn limit accessed */
  178 #define SDT_MEMRWD      22      /* memory read write expand dwn limit */
  179 #define SDT_MEMRWDA     23      /* memory read write expand dwn limit accessed*/
  180 #define SDT_MEME        24      /* memory execute only */
  181 #define SDT_MEMEA       25      /* memory execute only accessed */
  182 #define SDT_MEMER       26      /* memory execute read */
  183 #define SDT_MEMERA      27      /* memory execute read accessed */
  184 #define SDT_MEMEC       28      /* memory execute only conforming */
  185 #define SDT_MEMEAC      29      /* memory execute only accessed conforming */
  186 #define SDT_MEMERC      30      /* memory execute read conforming */
  187 #define SDT_MEMERAC     31      /* memory execute read accessed conforming */
  188 
  189 /*
  190  * Size of IDT table
  191  */
  192 #define NIDT            256     /* 32 reserved, 0x80 syscall, most are h/w */
  193 #define NRSVIDT         32      /* reserved entries for cpu exceptions */
  194 
  195 /*
  196  * Entries in the Interrupt Descriptor Table (IDT)
  197  */
  198 #define IDT_DE          0       /* #DE: Divide Error */
  199 #define IDT_DB          1       /* #DB: Debug */
  200 #define IDT_NMI         2       /* Nonmaskable External Interrupt */
  201 #define IDT_BP          3       /* #BP: Breakpoint */
  202 #define IDT_OF          4       /* #OF: Overflow */
  203 #define IDT_BR          5       /* #BR: Bound Range Exceeded */
  204 #define IDT_UD          6       /* #UD: Undefined/Invalid Opcode */
  205 #define IDT_NM          7       /* #NM: No Math Coprocessor */
  206 #define IDT_DF          8       /* #DF: Double Fault */
  207 #define IDT_FPUGP       9       /* Coprocessor Segment Overrun */
  208 #define IDT_TS          10      /* #TS: Invalid TSS */
  209 #define IDT_NP          11      /* #NP: Segment Not Present */
  210 #define IDT_SS          12      /* #SS: Stack Segment Fault */
  211 #define IDT_GP          13      /* #GP: General Protection Fault */
  212 #define IDT_PF          14      /* #PF: Page Fault */
  213 #define IDT_MF          16      /* #MF: FPU Floating-Point Error */
  214 #define IDT_AC          17      /* #AC: Alignment Check */
  215 #define IDT_MC          18      /* #MC: Machine Check */
  216 #define IDT_XF          19      /* #XF: SIMD Floating-Point Exception */
  217 #define IDT_IO_INTS     NRSVIDT /* Base of IDT entries for I/O interrupts. */
  218 #define IDT_SYSCALL     0x80    /* System Call Interrupt Vector */
  219 #define IDT_DTRACE_RET  0x92    /* DTrace pid provider Interrupt Vector */
  220 #define IDT_EVTCHN      0x93    /* Xen HVM Event Channel Interrupt Vector */
  221 
  222 #if defined(__i386__) || defined(__ia64__)
  223 /*
  224  * Entries in the Global Descriptor Table (GDT)
  225  * Note that each 4 entries share a single 32 byte L1 cache line.
  226  * Some of the fast syscall instructions require a specific order here.
  227  */
  228 #define GNULL_SEL       0       /* Null Descriptor */
  229 #define GPRIV_SEL       1       /* SMP Per-Processor Private Data */
  230 #define GUFS_SEL        2       /* User %fs Descriptor (order critical: 1) */
  231 #define GUGS_SEL        3       /* User %gs Descriptor (order critical: 2) */
  232 #define GCODE_SEL       4       /* Kernel Code Descriptor (order critical: 1) */
  233 #define GDATA_SEL       5       /* Kernel Data Descriptor (order critical: 2) */
  234 #define GUCODE_SEL      6       /* User Code Descriptor (order critical: 3) */
  235 #define GUDATA_SEL      7       /* User Data Descriptor (order critical: 4) */
  236 #define GBIOSLOWMEM_SEL 8       /* BIOS low memory access (must be entry 8) */
  237 #define GPROC0_SEL      9       /* Task state process slot zero and up */
  238 #define GLDT_SEL        10      /* Default User LDT */
  239 #define GUSERLDT_SEL    11      /* User LDT */
  240 #define GPANIC_SEL      12      /* Task state to consider panic from */
  241 #define GBIOSCODE32_SEL 13      /* BIOS interface (32bit Code) */
  242 #define GBIOSCODE16_SEL 14      /* BIOS interface (16bit Code) */
  243 #define GBIOSDATA_SEL   15      /* BIOS interface (Data) */
  244 #define GBIOSUTIL_SEL   16      /* BIOS interface (Utility) */
  245 #define GBIOSARGS_SEL   17      /* BIOS interface (Arguments) */
  246 #define GNDIS_SEL       18      /* For the NDIS layer */
  247 #ifdef XEN
  248 #define NGDT            9
  249 #else
  250 #define NGDT            19
  251 #endif
  252 
  253 /*
  254  * Entries in the Local Descriptor Table (LDT)
  255  */
  256 #define LSYS5CALLS_SEL  0       /* forced by intel BCS */
  257 #define LSYS5SIGR_SEL   1
  258 #define L43BSDCALLS_SEL 2       /* notyet */
  259 #define LUCODE_SEL      3
  260 #define LSOL26CALLS_SEL 4       /* Solaris >= 2.6 system call gate */
  261 #define LUDATA_SEL      5
  262 /* separate stack, es,fs,gs sels ? */
  263 /* #define      LPOSIXCALLS_SEL 5*/     /* notyet */
  264 #define LBSDICALLS_SEL  16      /* BSDI system call gate */
  265 #define NLDT            (LBSDICALLS_SEL + 1)
  266 
  267 #else /* !__i386__ && !__ia64__ */
  268 /*
  269  * Entries in the Global Descriptor Table (GDT)
  270  */
  271 #define GNULL_SEL       0       /* Null Descriptor */
  272 #define GNULL2_SEL      1       /* Null Descriptor */
  273 #define GUFS32_SEL      2       /* User 32 bit %fs Descriptor */
  274 #define GUGS32_SEL      3       /* User 32 bit %gs Descriptor */
  275 #define GCODE_SEL       4       /* Kernel Code Descriptor */
  276 #define GDATA_SEL       5       /* Kernel Data Descriptor */
  277 #define GUCODE32_SEL    6       /* User 32 bit code Descriptor */
  278 #define GUDATA_SEL      7       /* User 32/64 bit Data Descriptor */
  279 #define GUCODE_SEL      8       /* User 64 bit Code Descriptor */
  280 #define GPROC0_SEL      9       /* TSS for entering kernel etc */
  281 /* slot 10 is second half of GPROC0_SEL */
  282 #define GUSERLDT_SEL    11      /* LDT */
  283 /* slot 12 is second half of GUSERLDT_SEL */
  284 #define NGDT            13
  285 #endif /* __i386__ || __ia64__ */
  286 
  287 #endif /* !_X86_SEGMENTS_H_ */

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