diff options
Diffstat (limited to 'include/asm-m68k/segment.h')
-rw-r--r-- | include/asm-m68k/segment.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/include/asm-m68k/segment.h b/include/asm-m68k/segment.h new file mode 100644 index 000000000000..7b0b2d3127f9 --- /dev/null +++ b/include/asm-m68k/segment.h | |||
@@ -0,0 +1,57 @@ | |||
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 */ | ||