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Greg Ungerer48922422009-02-06 14:14:29 +10001#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)
Sam Ravnborg49148022009-01-16 21:58:10 +10009#endif
Greg Ungerer48922422009-02-06 14:14:29 +100010#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) })
Greg Ungerer48922422009-02-06 14:14:29 +100025
Greg Ungererfeb1ee72011-10-17 17:31:26 +100026#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
Greg Ungerer48922422009-02-06 14:14:29 +100027/*
28 * Get/set the SFC/DFC registers for MOVES instructions
29 */
Greg Ungererfeb1ee72011-10-17 17:31:26 +100030#define USER_DS MAKE_MM_SEG(__USER_DS)
31#define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS)
Greg Ungerer48922422009-02-06 14:14:29 +100032
33static inline mm_segment_t get_fs(void)
34{
Greg Ungerer48922422009-02-06 14:14:29 +100035 mm_segment_t _v;
36 __asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
Greg Ungerer48922422009-02-06 14:14:29 +100037 return _v;
Greg Ungererfeb1ee72011-10-17 17:31:26 +100038}
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");
Greg Ungerer48922422009-02-06 14:14:29 +100045}
46
47static inline mm_segment_t get_ds(void)
48{
49 /* return the supervisor data space code */
50 return KERNEL_DS;
51}
52
Greg Ungererfeb1ee72011-10-17 17:31:26 +100053#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))
Greg Ungerer48922422009-02-06 14:14:29 +100059#endif
Greg Ungerer48922422009-02-06 14:14:29 +100060
61#define segment_eq(a,b) ((a).seg == (b).seg)
62
63#endif /* __ASSEMBLY__ */
64
65#endif /* _M68K_SEGMENT_H */