include/asm-x86_64/segment.h

   1 #ifndef _ASM_SEGMENT_H
   2 #define _ASM_SEGMENT_H
   3
   4 #include <asm/cache.h>
   5
   6 /* Simple and small GDT entries for booting only */
   7
   8 #define GDT_ENTRY_BOOT_CS               2
   9 #define __BOOT_CS       (GDT_ENTRY_BOOT_CS * 8)
  10
  11 #define GDT_ENTRY_BOOT_DS               (GDT_ENTRY_BOOT_CS + 1)
  12 #define __BOOT_DS       (GDT_ENTRY_BOOT_DS * 8)
  13
  14 #define __KERNEL_CS     0x10
  15 #define __KERNEL_DS     0x18
  16
  17 #define __KERNEL32_CS   0x08
  18
  19 /*
  20  * we cannot use the same code segment descriptor for user and kernel
  21  * -- not even in the long flat mode, because of different DPL /kkeil
  22  * The segment offset needs to contain a RPL. Grr. -AK
  23  * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
  24  */
  25
  26 #define __USER32_CS   0x23   /* 4*8+3 */
  27 #define __USER_DS     0x2b   /* 5*8+3 */
  28 #define __USER_CS     0x33   /* 6*8+3 */
  29 #define __USER32_DS     __USER_DS
  30
  31 #define GDT_ENTRY_TSS 8 /* needs two entries */
  32 #define GDT_ENTRY_LDT 10 /* needs two entries */
  33 #define GDT_ENTRY_TLS_MIN 12
  34 #define GDT_ENTRY_TLS_MAX 14
  35
  36 #define GDT_ENTRY_TLS_ENTRIES 3
  37
  38 #define GDT_ENTRY_PER_CPU 15    /* Abused to load per CPU data from limit */
  39 #define __PER_CPU_SEG   (GDT_ENTRY_PER_CPU * 8 + 3)
  40
  41 /* TLS indexes for 64bit - hardcoded in arch_prctl */
  42 #define FS_TLS 0
  43 #define GS_TLS 1
  44
  45 #define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
  46 #define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
  47
  48 #define IDT_ENTRIES 256
  49 #define GDT_ENTRIES 16
  50 #define GDT_SIZE (GDT_ENTRIES * 8)
  51 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
  52
  53 #endif