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 */
58
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