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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
20typedef 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
32static 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
40static inline mm_segment_t get_ds(void)
41{
42 /* return the supervisor data space code */
43 return KERNEL_DS;
44}
45
46static 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 */