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1da177e4 LT |
1 | #ifndef __ASM_SH_SEGMENT_H |
2 | #define __ASM_SH_SEGMENT_H | |
3 | ||
02f7e627 | 4 | #ifndef __ASSEMBLY__ |
1da177e4 | 5 | |
02f7e627 PM |
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 | ||
3237f28e | 26 | #define segment_eq(a, b) ((a).seg == (b).seg) |
02f7e627 PM |
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__ */ | |
1da177e4 | 34 | #endif /* __ASM_SH_SEGMENT_H */ |