diff options
Diffstat (limited to 'include/asm-i386/segment.h')
| -rw-r--r-- | include/asm-i386/segment.h | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/include/asm-i386/segment.h b/include/asm-i386/segment.h index 3c796af..065f10b 100644 --- a/include/asm-i386/segment.h +++ b/include/asm-i386/segment.h @@ -83,14 +83,8 @@ * The GDT has 32 entries */ #define GDT_ENTRIES 32 - #define GDT_SIZE (GDT_ENTRIES * 8) -/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */ -#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8) -/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */ -#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8) - /* Simple and small GDT entries for booting only */ #define GDT_ENTRY_BOOT_CS 2 @@ -134,4 +128,17 @@ #ifndef CONFIG_PARAVIRT #define get_kernel_rpl() 0 #endif +/* + * Matching rules for certain types of segments. + */ + +/* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */ +#define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8) + +/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */ +#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8) + +/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */ +#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8) + #endif |