diff options
Diffstat (limited to 'include/asm-x86/segment_64.h')
| -rw-r--r-- | include/asm-x86/segment_64.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/include/asm-x86/segment_64.h b/include/asm-x86/segment_64.h new file mode 100644 index 000000000000..04b8ab21328f --- /dev/null +++ b/include/asm-x86/segment_64.h @@ -0,0 +1,53 @@ +#ifndef _ASM_SEGMENT_H +#define _ASM_SEGMENT_H + +#include <asm/cache.h> + +/* Simple and small GDT entries for booting only */ + +#define GDT_ENTRY_BOOT_CS 2 +#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8) + +#define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1) +#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8) + +#define __KERNEL_CS 0x10 +#define __KERNEL_DS 0x18 + +#define __KERNEL32_CS 0x08 + +/* + * we cannot use the same code segment descriptor for user and kernel + * -- not even in the long flat mode, because of different DPL /kkeil + * The segment offset needs to contain a RPL. Grr. -AK + * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets) + */ + +#define __USER32_CS 0x23 /* 4*8+3 */ +#define __USER_DS 0x2b /* 5*8+3 */ +#define __USER_CS 0x33 /* 6*8+3 */ +#define __USER32_DS __USER_DS + +#define GDT_ENTRY_TSS 8 /* needs two entries */ +#define GDT_ENTRY_LDT 10 /* needs two entries */ +#define GDT_ENTRY_TLS_MIN 12 +#define GDT_ENTRY_TLS_MAX 14 + +#define GDT_ENTRY_TLS_ENTRIES 3 + +#define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */ +#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3) + +/* TLS indexes for 64bit - hardcoded in arch_prctl */ +#define FS_TLS 0 +#define GS_TLS 1 + +#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3) +#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3) + +#define IDT_ENTRIES 256 +#define GDT_ENTRIES 16 +#define GDT_SIZE (GDT_ENTRIES * 8) +#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) + +#endif |