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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
4892242a GU |
2 | #ifndef _M68K_SEGMENT_H |
3 | #define _M68K_SEGMENT_H | |
4 | ||
5 | /* define constants */ | |
6 | /* Address spaces (FC0-FC2) */ | |
7 | #define USER_DATA (1) | |
8 | #ifndef __USER_DS | |
9 | #define __USER_DS (USER_DATA) | |
10 | #endif | |
11 | #define USER_PROGRAM (2) | |
12 | #define SUPER_DATA (5) | |
13 | #ifndef __KERNEL_DS | |
14 | #define __KERNEL_DS (SUPER_DATA) | |
15 | #endif | |
16 | #define SUPER_PROGRAM (6) | |
17 | #define CPU_SPACE (7) | |
18 | ||
19 | #ifndef __ASSEMBLY__ | |
20 | ||
21 | typedef struct { | |
22 | unsigned long seg; | |
23 | } mm_segment_t; | |
24 | ||
25 | #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) | |
4892242a | 26 | |
feb1ee75 | 27 | #ifdef CONFIG_CPU_HAS_ADDRESS_SPACES |
4892242a GU |
28 | /* |
29 | * Get/set the SFC/DFC registers for MOVES instructions | |
30 | */ | |
feb1ee75 GU |
31 | #define USER_DS MAKE_MM_SEG(__USER_DS) |
32 | #define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS) | |
4892242a GU |
33 | |
34 | static inline mm_segment_t get_fs(void) | |
35 | { | |
4892242a GU |
36 | mm_segment_t _v; |
37 | __asm__ ("movec %/dfc,%0":"=r" (_v.seg):); | |
4892242a | 38 | return _v; |
feb1ee75 GU |
39 | } |
40 | ||
41 | static inline void set_fs(mm_segment_t val) | |
42 | { | |
43 | __asm__ __volatile__ ("movec %0,%/sfc\n\t" | |
44 | "movec %0,%/dfc\n\t" | |
45 | : /* no outputs */ : "r" (val.seg) : "memory"); | |
4892242a GU |
46 | } |
47 | ||
48 | static inline mm_segment_t get_ds(void) | |
49 | { | |
50 | /* return the supervisor data space code */ | |
51 | return KERNEL_DS; | |
52 | } | |
53 | ||
feb1ee75 GU |
54 | #else |
55 | #define USER_DS MAKE_MM_SEG(TASK_SIZE) | |
56 | #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) | |
57 | #define get_ds() (KERNEL_DS) | |
58 | #define get_fs() (current_thread_info()->addr_limit) | |
59 | #define set_fs(x) (current_thread_info()->addr_limit = (x)) | |
49148020 | 60 | #endif |
4892242a | 61 | |
e9e6d918 | 62 | #define segment_eq(a, b) ((a).seg == (b).seg) |
4892242a GU |
63 | |
64 | #endif /* __ASSEMBLY__ */ | |
65 | ||
66 | #endif /* _M68K_SEGMENT_H */ |