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1da177e4 LT |
1 | #ifndef _M68K_SEGMENT_H |
2 | #define _M68K_SEGMENT_H | |
3 | ||
4 | /* define constants */ | |
5 | /* Address spaces (FC0-FC2) */ | |
6 | #define USER_DATA (1) | |
7 | #ifndef __USER_DS | |
8 | #define __USER_DS (USER_DATA) | |
9 | #endif | |
10 | #define USER_PROGRAM (2) | |
11 | #define SUPER_DATA (5) | |
12 | #ifndef __KERNEL_DS | |
13 | #define __KERNEL_DS (SUPER_DATA) | |
14 | #endif | |
15 | #define SUPER_PROGRAM (6) | |
16 | #define CPU_SPACE (7) | |
17 | ||
18 | #ifndef __ASSEMBLY__ | |
19 | ||
20 | typedef struct { | |
21 | unsigned long seg; | |
22 | } mm_segment_t; | |
23 | ||
24 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
25 | #define USER_DS MAKE_MM_SEG(__USER_DS) | |
26 | #define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS) | |
27 | ||
28 | /* | |
29 | * Get/set the SFC/DFC registers for MOVES instructions | |
30 | */ | |
31 | ||
32 | static inline mm_segment_t get_fs(void) | |
33 | { | |
34 | mm_segment_t _v; | |
35 | __asm__ ("movec %/dfc,%0":"=r" (_v.seg):); | |
36 | ||
37 | return _v; | |
38 | } | |
39 | ||
40 | static inline mm_segment_t get_ds(void) | |
41 | { | |
42 | /* return the supervisor data space code */ | |
43 | return KERNEL_DS; | |
44 | } | |
45 | ||
46 | static inline void set_fs(mm_segment_t val) | |
47 | { | |
48 | __asm__ __volatile__ ("movec %0,%/sfc\n\t" | |
49 | "movec %0,%/dfc\n\t" | |
50 | : /* no outputs */ : "r" (val.seg) : "memory"); | |
51 | } | |
52 | ||
53 | #define segment_eq(a,b) ((a).seg == (b).seg) | |
54 | ||
55 | #endif /* __ASSEMBLY__ */ | |
56 | ||
57 | #endif /* _M68K_SEGMENT_H */ |