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/i386/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  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by the University of
   20  *      California, Berkeley and its contributors.
   21  * 4. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      from: @(#)segments.h    7.1 (Berkeley) 5/9/91
   38  * $FreeBSD: releng/5.0/sys/i386/include/segments.h 103987 2002-09-26 05:07:41Z peter $
   39  */
   40 
   41 #ifndef _MACHINE_SEGMENTS_H_
   42 #define _MACHINE_SEGMENTS_H_
   43 
   44 /*
   45  * 386 Segmentation Data Structures and definitions
   46  *      William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
   47  */
   48 
   49 /*
   50  * Selectors
   51  */
   52 
   53 #define ISPL(s) ((s)&3)         /* what is the priority level of a selector */
   54 #define SEL_KPL 0               /* kernel priority level */
   55 #define SEL_UPL 3               /* user priority level */
   56 #define ISLDT(s)        ((s)&SEL_LDT)   /* is it local or global */
   57 #define SEL_LDT 4               /* local descriptor table */
   58 #define IDXSEL(s)       (((s)>>3) & 0x1fff)             /* index of selector */
   59 #define LSEL(s,r)       (((s)<<3) | SEL_LDT | r)        /* a local selector */
   60 #define GSEL(s,r)       (((s)<<3) | r)                  /* a global selector */
   61 
   62 /*
   63  * Memory and System segment descriptors
   64  */
   65 struct  segment_descriptor      {
   66         unsigned sd_lolimit:16 ;        /* segment extent (lsb) */
   67         unsigned sd_lobase:24 __packed; /* segment base address (lsb) */
   68         unsigned sd_type:5 ;            /* segment type */
   69         unsigned sd_dpl:2 ;             /* segment descriptor priority level */
   70         unsigned sd_p:1 ;               /* segment descriptor present */
   71         unsigned sd_hilimit:4 ;         /* segment extent (msb) */
   72         unsigned sd_xx:2 ;              /* unused */
   73         unsigned sd_def32:1 ;           /* default 32 vs 16 bit size */
   74         unsigned sd_gran:1 ;            /* limit granularity (byte/page units)*/
   75         unsigned sd_hibase:8 ;          /* segment base address  (msb) */
   76 } ;
   77 
   78 /*
   79  * Gate descriptors (e.g. indirect descriptors)
   80  */
   81 struct  gate_descriptor {
   82         unsigned gd_looffset:16 ;       /* gate offset (lsb) */
   83         unsigned gd_selector:16 ;       /* gate segment selector */
   84         unsigned gd_stkcpy:5 ;          /* number of stack wds to cpy */
   85         unsigned gd_xx:3 ;              /* unused */
   86         unsigned gd_type:5 ;            /* segment type */
   87         unsigned gd_dpl:2 ;             /* segment descriptor priority level */
   88         unsigned gd_p:1 ;               /* segment descriptor present */
   89         unsigned gd_hioffset:16 ;       /* gate offset (msb) */
   90 } ;
   91 
   92 /*
   93  * Generic descriptor
   94  */
   95 union   descriptor      {
   96         struct  segment_descriptor sd;
   97         struct  gate_descriptor gd;
   98 };
   99 
  100         /* system segments and gate types */
  101 #define SDT_SYSNULL      0      /* system null */
  102 #define SDT_SYS286TSS    1      /* system 286 TSS available */
  103 #define SDT_SYSLDT       2      /* system local descriptor table */
  104 #define SDT_SYS286BSY    3      /* system 286 TSS busy */
  105 #define SDT_SYS286CGT    4      /* system 286 call gate */
  106 #define SDT_SYSTASKGT    5      /* system task gate */
  107 #define SDT_SYS286IGT    6      /* system 286 interrupt gate */
  108 #define SDT_SYS286TGT    7      /* system 286 trap gate */
  109 #define SDT_SYSNULL2     8      /* system null again */
  110 #define SDT_SYS386TSS    9      /* system 386 TSS available */
  111 #define SDT_SYSNULL3    10      /* system null again */
  112 #define SDT_SYS386BSY   11      /* system 386 TSS busy */
  113 #define SDT_SYS386CGT   12      /* system 386 call gate */
  114 #define SDT_SYSNULL4    13      /* system null again */
  115 #define SDT_SYS386IGT   14      /* system 386 interrupt gate */
  116 #define SDT_SYS386TGT   15      /* system 386 trap gate */
  117 
  118         /* memory segment types */
  119 #define SDT_MEMRO       16      /* memory read only */
  120 #define SDT_MEMROA      17      /* memory read only accessed */
  121 #define SDT_MEMRW       18      /* memory read write */
  122 #define SDT_MEMRWA      19      /* memory read write accessed */
  123 #define SDT_MEMROD      20      /* memory read only expand dwn limit */
  124 #define SDT_MEMRODA     21      /* memory read only expand dwn limit accessed */
  125 #define SDT_MEMRWD      22      /* memory read write expand dwn limit */
  126 #define SDT_MEMRWDA     23      /* memory read write expand dwn limit accessed */
  127 #define SDT_MEME        24      /* memory execute only */
  128 #define SDT_MEMEA       25      /* memory execute only accessed */
  129 #define SDT_MEMER       26      /* memory execute read */
  130 #define SDT_MEMERA      27      /* memory execute read accessed */
  131 #define SDT_MEMEC       28      /* memory execute only conforming */
  132 #define SDT_MEMEAC      29      /* memory execute only accessed conforming */
  133 #define SDT_MEMERC      30      /* memory execute read conforming */
  134 #define SDT_MEMERAC     31      /* memory execute read accessed conforming */
  135 
  136 /*
  137  * Software definitions are in this convenient format,
  138  * which are translated into inconvenient segment descriptors
  139  * when needed to be used by the 386 hardware
  140  */
  141 
  142 struct  soft_segment_descriptor {
  143         unsigned ssd_base ;             /* segment base address  */
  144         unsigned ssd_limit ;            /* segment extent */
  145         unsigned ssd_type:5 ;           /* segment type */
  146         unsigned ssd_dpl:2 ;            /* segment descriptor priority level */
  147         unsigned ssd_p:1 ;              /* segment descriptor present */
  148         unsigned ssd_xx:4 ;             /* unused */
  149         unsigned ssd_xx1:2 ;            /* unused */
  150         unsigned ssd_def32:1 ;          /* default 32 vs 16 bit size */
  151         unsigned ssd_gran:1 ;           /* limit granularity (byte/page units)*/
  152 };
  153 
  154 /*
  155  * region descriptors, used to load gdt/idt tables before segments yet exist.
  156  */
  157 struct region_descriptor {
  158         unsigned rd_limit:16;           /* segment extent */
  159         unsigned rd_base:32 __packed;   /* base address  */
  160 };
  161 
  162 /*
  163  * Segment Protection Exception code bits
  164  */
  165 
  166 #define SEGEX_EXT       0x01    /* recursive or externally induced */
  167 #define SEGEX_IDT       0x02    /* interrupt descriptor table */
  168 #define SEGEX_TI        0x04    /* local descriptor table */
  169                                 /* other bits are affected descriptor index */
  170 #define SEGEX_IDX(s)    (((s)>>3)&0x1fff)
  171 
  172 /*
  173  * Size of IDT table
  174  */
  175 
  176 #if defined(SMP) || defined(APIC_IO)
  177 #define NIDT    256             /* we use them all */
  178 #else
  179 #define NIDT    129             /* 32 reserved, 16 h/w, 0 s/w, linux's 0x80 */
  180 #endif /* SMP || APIC_IO */
  181 #define NRSVIDT 32              /* reserved entries for cpu exceptions */
  182 
  183 /*
  184  * Entries in the Global Descriptor Table (GDT)
  185  */
  186 #define GNULL_SEL       0       /* Null Descriptor */
  187 #define GCODE_SEL       1       /* Kernel Code Descriptor */
  188 #define GDATA_SEL       2       /* Kernel Data Descriptor */
  189 #define GPRIV_SEL       3       /* SMP Per-Processor Private Data */
  190 #define GPROC0_SEL      4       /* Task state process slot zero and up */
  191 #define GLDT_SEL        5       /* LDT - eventually one per process */
  192 #define GUSERLDT_SEL    6       /* User LDT */
  193 #define GTGATE_SEL      7       /* Process task switch gate */
  194 #define GBIOSLOWMEM_SEL 8       /* BIOS low memory access (must be entry 8) */
  195 #define GPANIC_SEL      9       /* Task state to consider panic from */
  196 #define GBIOSCODE32_SEL 10      /* BIOS interface (32bit Code) */
  197 #define GBIOSCODE16_SEL 11      /* BIOS interface (16bit Code) */
  198 #define GBIOSDATA_SEL   12      /* BIOS interface (Data) */
  199 #define GBIOSUTIL_SEL   13      /* BIOS interface (Utility) */
  200 #define GBIOSARGS_SEL   14      /* BIOS interface (Arguments) */
  201 
  202 #ifdef BDE_DEBUGGER
  203 #define NGDT            18      /* some of 11-17 are reserved for debugger */
  204 #else
  205 #define NGDT            15
  206 #endif
  207 
  208 /*
  209  * Entries in the Local Descriptor Table (LDT)
  210  */
  211 #define LSYS5CALLS_SEL  0       /* forced by intel BCS */
  212 #define LSYS5SIGR_SEL   1
  213 #define L43BSDCALLS_SEL 2       /* notyet */
  214 #define LUCODE_SEL      3
  215 #define LSOL26CALLS_SEL 4       /* Solaris >= 2.6 system call gate */
  216 #define LUDATA_SEL      5
  217 /* separate stack, es,fs,gs sels ? */
  218 /* #define      LPOSIXCALLS_SEL 5*/     /* notyet */
  219 #define LBSDICALLS_SEL  16      /* BSDI system call gate */
  220 #define NLDT            (LBSDICALLS_SEL + 1)
  221 
  222 #ifdef _KERNEL
  223 extern int      _default_ldt;
  224 extern union descriptor gdt[];
  225 extern struct soft_segment_descriptor gdt_segs[];
  226 extern struct gate_descriptor *idt;
  227 extern union descriptor ldt[NLDT];
  228 
  229 void    lgdt(struct region_descriptor *rdp);
  230 void    sdtossd(struct segment_descriptor *sdp,
  231             struct soft_segment_descriptor *ssdp);
  232 void    ssdtosd(struct soft_segment_descriptor *ssdp,
  233             struct segment_descriptor *sdp);
  234 #endif /* _KERNEL */
  235 
  236 #endif /* !_MACHINE_SEGMENTS_H_ */

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