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
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 */
58