lunaix-os/includes/arch/x86/gdt.h

   1 #ifndef __LUNAIX_GDT_H
   2 #define __LUNAIX_GDT_H 1
   3
   4 #define SD_TYPE(x)              (x << 8)
   5 #define SD_CODE_DATA(x)         (x << 12)
   6 #define SD_DPL(x)               (x << 13)
   7 #define SD_PRESENT(x)           (x << 15)
   8 #define SD_AVL(x)               (x << 20)
   9 #define SD_64BITS(x)            (x << 21)
  10 #define SD_32BITS(x)            (x << 22)
  11 #define SD_4K_GRAN(x)           (x << 23)
  12
  13 #define SEG_LIM_L(x)            (x & 0x0ffff)
  14 #define SEG_LIM_H(x)            (x & 0xf0000)
  15 #define SEG_BASE_L(x)           ((x & 0x0000ffff) << 16)
  16 #define SEG_BASE_M(x)           ((x & 0x00ff0000) >> 16)
  17 #define SEG_BASE_H(x)            (x & 0xff000000)
  18
  19 #define SEG_DATA_RD         0x00 // Read-Only
  20 #define SEG_DATA_RDA        0x01 // Read-Only, accessed
  21 #define SEG_DATA_RDWR       0x02 // Read/Write
  22 #define SEG_DATA_RDWRA      0x03 // Read/Write, accessed
  23 #define SEG_DATA_RDEXPD     0x04 // Read-Only, expand-down
  24 #define SEG_DATA_RDEXPDA    0x05 // Read-Only, expand-down, accessed
  25 #define SEG_DATA_RDWREXPD   0x06 // Read/Write, expand-down
  26 #define SEG_DATA_RDWREXPDA  0x07 // Read/Write, expand-down, accessed
  27 #define SEG_CODE_EX         0x08 // Execute-Only
  28 #define SEG_CODE_EXA        0x09 // Execute-Only, accessed
  29 #define SEG_CODE_EXRD       0x0A // Execute/Read
  30 #define SEG_CODE_EXRDA      0x0B // Execute/Read, accessed
  31 #define SEG_CODE_EXC        0x0C // Execute-Only, conforming
  32 #define SEG_CODE_EXCA       0x0D // Execute-Only, conforming, accessed
  33 #define SEG_CODE_EXRDC      0x0E // Execute/Read, conforming
  34 #define SEG_CODE_EXRDCA     0x0F // Execute/Read, conforming, accessed
  35
  36 #define SEG_R0_CODE         SD_TYPE(SEG_CODE_EXRD) | SD_CODE_DATA(1) | SD_DPL(0) | \
  37                             SD_PRESENT(1) | SD_AVL(0) | SD_64BITS(0) | SD_32BITS(1) | \
  38                             SD_4K_GRAN(1)
  39
  40 #define SEG_R0_DATA         SD_TYPE(SEG_DATA_RDWR) | SD_CODE_DATA(1) | SD_DPL(0) | \
  41                             SD_PRESENT(1) | SD_AVL(0) | SD_64BITS(0) | SD_32BITS(1) | \
  42                             SD_4K_GRAN(1)
  43
  44 #define SEG_R3_CODE         SD_TYPE(SEG_CODE_EXRD) | SD_CODE_DATA(1) | SD_DPL(3) | \
  45                             SD_PRESENT(1) | SD_AVL(0) | SD_64BITS(0) | SD_32BITS(1) | \
  46                             SD_4K_GRAN(1)
  47
  48 #define SEG_R3_DATA         SD_TYPE(SEG_DATA_RDWR) | SD_CODE_DATA(1) | SD_DPL(3) | \
  49                             SD_PRESENT(1) | SD_AVL(0) | SD_64BITS(0) | SD_32BITS(1) | \
  50                             SD_4K_GRAN(1)
  51
  52 #define SEG_TSS             SD_TYPE(9) | SD_DPL(0) | SD_PRESENT(1)
  53
  54
  55 void
  56 _init_gdt();
  57
  58 #endif