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/kernel/protect.h

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    1 /* Constants for protected mode. */
    2 
    3 /* Table sizes. */
    4 #define GDT_SIZE (FIRST_LDT_INDEX + NR_TASKS + NR_PROCS) 
    5                                         /* spec. and LDT's */
    6 #define IDT_SIZE (IRQ8_VECTOR + 8)      /* only up to the highest vector */
    7 #define LDT_SIZE (2 + NR_REMOTE_SEGS)   /* CS, DS and remote segments */
    8 
    9 /* Fixed global descriptors.  1 to 7 are prescribed by the BIOS. */
   10 #define GDT_INDEX            1  /* GDT descriptor */
   11 #define IDT_INDEX            2  /* IDT descriptor */
   12 #define DS_INDEX             3  /* kernel DS */
   13 #define ES_INDEX             4  /* kernel ES (386: flag 4 Gb at startup) */
   14 #define SS_INDEX             5  /* kernel SS (386: monitor SS at startup) */
   15 #define CS_INDEX             6  /* kernel CS */
   16 #define MON_CS_INDEX         7  /* temp for BIOS (386: monitor CS at startup) */
   17 #define TSS_INDEX            8  /* kernel TSS */
   18 #define DS_286_INDEX         9  /* scratch 16-bit source segment */
   19 #define ES_286_INDEX        10  /* scratch 16-bit destination segment */
   20 #define A_INDEX             11  /* 64K memory segment at A0000 */
   21 #define B_INDEX             12  /* 64K memory segment at B0000 */
   22 #define C_INDEX             13  /* 64K memory segment at C0000 */
   23 #define D_INDEX             14  /* 64K memory segment at D0000 */
   24 #define FIRST_LDT_INDEX     15  /* rest of descriptors are LDT's */
   25 
   26 #define GDT_SELECTOR      0x08  /* (GDT_INDEX * DESC_SIZE) bad for asld */
   27 #define IDT_SELECTOR      0x10  /* (IDT_INDEX * DESC_SIZE) */
   28 #define DS_SELECTOR       0x18  /* (DS_INDEX * DESC_SIZE) */
   29 #define ES_SELECTOR       0x20  /* (ES_INDEX * DESC_SIZE) */
   30 #define FLAT_DS_SELECTOR  0x21  /* less privileged ES */
   31 #define SS_SELECTOR       0x28  /* (SS_INDEX * DESC_SIZE) */
   32 #define CS_SELECTOR       0x30  /* (CS_INDEX * DESC_SIZE) */
   33 #define MON_CS_SELECTOR   0x38  /* (MON_CS_INDEX * DESC_SIZE) */
   34 #define TSS_SELECTOR      0x40  /* (TSS_INDEX * DESC_SIZE) */
   35 #define DS_286_SELECTOR   0x49  /* (DS_286_INDEX*DESC_SIZE+TASK_PRIVILEGE) */
   36 #define ES_286_SELECTOR   0x51  /* (ES_286_INDEX*DESC_SIZE+TASK_PRIVILEGE) */
   37 
   38 /* Fixed local descriptors. */
   39 #define CS_LDT_INDEX         0  /* process CS */
   40 #define DS_LDT_INDEX         1  /* process DS=ES=FS=GS=SS */
   41 #define EXTRA_LDT_INDEX      2  /* first of the extra LDT entries */
   42 
   43 /* Privileges. */
   44 #define INTR_PRIVILEGE       0  /* kernel and interrupt handlers */
   45 #define TASK_PRIVILEGE       1  /* kernel tasks */
   46 #define USER_PRIVILEGE       3  /* servers and user processes */
   47 
   48 /* 286 hardware constants. */
   49 
   50 /* Exception vector numbers. */
   51 #define BOUNDS_VECTOR        5  /* bounds check failed */
   52 #define INVAL_OP_VECTOR      6  /* invalid opcode */
   53 #define COPROC_NOT_VECTOR    7  /* coprocessor not available */
   54 #define DOUBLE_FAULT_VECTOR  8
   55 #define COPROC_SEG_VECTOR    9  /* coprocessor segment overrun */
   56 #define INVAL_TSS_VECTOR    10  /* invalid TSS */
   57 #define SEG_NOT_VECTOR      11  /* segment not present */
   58 #define STACK_FAULT_VECTOR  12  /* stack exception */
   59 #define PROTECTION_VECTOR   13  /* general protection */
   60 
   61 /* Selector bits. */
   62 #define TI                0x04  /* table indicator */
   63 #define RPL               0x03  /* requester privilege level */
   64 
   65 /* Descriptor structure offsets. */
   66 #define DESC_BASE            2  /* to base_low */
   67 #define DESC_BASE_MIDDLE     4  /* to base_middle */
   68 #define DESC_ACCESS          5  /* to access byte */
   69 #define DESC_SIZE            8  /* sizeof (struct segdesc_s) */
   70 
   71 /* Base and limit sizes and shifts. */
   72 #define BASE_MIDDLE_SHIFT   16  /* shift for base --> base_middle */
   73 
   74 /* Access-byte and type-byte bits. */
   75 #define PRESENT           0x80  /* set for descriptor present */
   76 #define DPL               0x60  /* descriptor privilege level mask */
   77 #define DPL_SHIFT            5
   78 #define SEGMENT           0x10  /* set for segment-type descriptors */
   79 
   80 /* Access-byte bits. */
   81 #define EXECUTABLE        0x08  /* set for executable segment */
   82 #define CONFORMING        0x04  /* set for conforming segment if executable */
   83 #define EXPAND_DOWN       0x04  /* set for expand-down segment if !executable*/
   84 #define READABLE          0x02  /* set for readable segment if executable */
   85 #define WRITEABLE         0x02  /* set for writeable segment if !executable */
   86 #define TSS_BUSY          0x02  /* set if TSS descriptor is busy */
   87 #define ACCESSED          0x01  /* set if segment accessed */
   88 
   89 /* Special descriptor types. */
   90 #define AVL_286_TSS          1  /* available 286 TSS */
   91 #define LDT                  2  /* local descriptor table */
   92 #define BUSY_286_TSS         3  /* set transparently to the software */
   93 #define CALL_286_GATE        4  /* not used */
   94 #define TASK_GATE            5  /* only used by debugger */
   95 #define INT_286_GATE         6  /* interrupt gate, used for all vectors */
   96 #define TRAP_286_GATE        7  /* not used */
   97 
   98 /* Extra 386 hardware constants. */
   99 
  100 /* Exception vector numbers. */
  101 #define PAGE_FAULT_VECTOR   14
  102 #define COPROC_ERR_VECTOR   16  /* coprocessor error */
  103 
  104 /* Descriptor structure offsets. */
  105 #define DESC_GRANULARITY     6  /* to granularity byte */
  106 #define DESC_BASE_HIGH       7  /* to base_high */
  107 
  108 /* Base and limit sizes and shifts. */
  109 #define BASE_HIGH_SHIFT     24  /* shift for base --> base_high */
  110 #define BYTE_GRAN_MAX   0xFFFFFL   /* maximum size for byte granular segment */
  111 #define GRANULARITY_SHIFT   16  /* shift for limit --> granularity */
  112 #define OFFSET_HIGH_SHIFT   16  /* shift for (gate) offset --> offset_high */
  113 #define PAGE_GRAN_SHIFT     12  /* extra shift for page granular limits */
  114 
  115 /* Type-byte bits. */
  116 #define DESC_386_BIT  0x08 /* 386 types are obtained by ORing with this */
  117                                 /* LDT's and TASK_GATE's don't need it */
  118 
  119 /* Granularity byte. */
  120 #define GRANULAR          0x80  /* set for 4K granularilty */
  121 #define DEFAULT           0x40  /* set for 32-bit defaults (executable seg) */
  122 #define BIG               0x40  /* set for "BIG" (expand-down seg) */
  123 #define AVL               0x10  /* 0 for available */
  124 #define LIMIT_HIGH        0x0F  /* mask for high bits of limit */

Cache object: 7c41b863bb51bee638eb5abf0fec933d


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