include/asm-x86_64/segment.h

   1 #ifndef _ASM_SEGMENT_H
   2 #define _ASM_SEGMENT_H
   3
   4 #include <asm/cache.h>
   5
   6 #define __KERNEL_CS     0x10
   7 #define __KERNEL_DS     0x18
   8
   9 #define __KERNEL32_CS   0x38
  10
  11 /*
  12  * we cannot use the same code segment descriptor for user and kernel
  13  * -- not even in the long flat mode, because of different DPL /kkeil
  14  * The segment offset needs to contain a RPL. Grr. -AK
  15  * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
  16  */
  17
  18 #define __USER32_CS   0x23   /* 4*8+3 */
  19 #define __USER_DS     0x2b   /* 5*8+3 */
  20 #define __USER_CS     0x33   /* 6*8+3 */
  21 #define __USER32_DS     __USER_DS
  22
  23 #define GDT_ENTRY_TSS 8 /* needs two entries */
  24 #define GDT_ENTRY_LDT 10 /* needs two entries */
  25 #define GDT_ENTRY_TLS_MIN 12
  26 #define GDT_ENTRY_TLS_MAX 14
  27
  28 #define GDT_ENTRY_TLS_ENTRIES 3
  29
  30 #define GDT_ENTRY_PER_CPU 15    /* Abused to load per CPU data from limit */
  31 #define __PER_CPU_SEG   (GDT_ENTRY_PER_CPU * 8 + 3)
  32
  33 /* TLS indexes for 64bit - hardcoded in arch_prctl */
  34 #define FS_TLS 0
  35 #define GS_TLS 1
  36
  37 #define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
  38 #define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
  39
  40 #define IDT_ENTRIES 256
  41 #define GDT_ENTRIES 16
  42 #define GDT_SIZE (GDT_ENTRIES * 8)
  43 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
  44
  45 #endif