| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __ASM_SH_SEGMENT_H |
| 2 | #define __ASM_SH_SEGMENT_H |
| 3 | |
| Paul Mundt | 02f7e62 | 2008-06-03 18:48:54 +0900 | [diff] [blame] | 4 | #ifndef __ASSEMBLY__ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | |
| Paul Mundt | 02f7e62 | 2008-06-03 18:48:54 +0900 | [diff] [blame] | 6 | typedef struct { |
| 7 | unsigned long seg; |
| 8 | } mm_segment_t; |
| 9 | |
| 10 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) |
| 11 | |
| 12 | /* |
| 13 | * The fs value determines whether argument validity checking should be |
| 14 | * performed or not. If get_fs() == USER_DS, checking is performed, with |
| 15 | * get_fs() == KERNEL_DS, checking is bypassed. |
| 16 | * |
| 17 | * For historical reasons, these macros are grossly misnamed. |
| 18 | */ |
| 19 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL) |
| 20 | #ifdef CONFIG_MMU |
| 21 | #define USER_DS MAKE_MM_SEG(PAGE_OFFSET) |
| 22 | #else |
| 23 | #define USER_DS KERNEL_DS |
| 24 | #endif |
| 25 | |
| 26 | #define segment_eq(a,b) ((a).seg == (b).seg) |
| 27 | |
| 28 | #define get_ds() (KERNEL_DS) |
| 29 | |
| 30 | #define get_fs() (current_thread_info()->addr_limit) |
| 31 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) |
| 32 | |
| 33 | #endif /* __ASSEMBLY__ */ |
| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #endif /* __ASM_SH_SEGMENT_H */ |