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
26#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
27/*
28 * Get/set the SFC/DFC registers for MOVES instructions
29 */
30#define USER_DS		MAKE_MM_SEG(__USER_DS)
31#define KERNEL_DS	MAKE_MM_SEG(__KERNEL_DS)
32
33static inline mm_segment_t get_fs(void)
34{
35	mm_segment_t _v;
36	__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
37	return _v;
38}
39
40static inline void set_fs(mm_segment_t val)
41{
42	__asm__ __volatile__ ("movec %0,%/sfc\n\t"
43			      "movec %0,%/dfc\n\t"
44			      : /* no outputs */ : "r" (val.seg) : "memory");
45}
46
47static inline mm_segment_t get_ds(void)
48{
49    /* return the supervisor data space code */
50    return KERNEL_DS;
51}
52
53#else
54#define USER_DS		MAKE_MM_SEG(TASK_SIZE)
55#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
56#define get_ds()	(KERNEL_DS)
57#define get_fs()	(current_thread_info()->addr_limit)
58#define set_fs(x)	(current_thread_info()->addr_limit = (x))
59#endif
60
61#define segment_eq(a, b) ((a).seg == (b).seg)
62
63#endif /* __ASSEMBLY__ */
64
65#endif /* _M68K_SEGMENT_H */
66