1/* SPDX-License-Identifier: GPL-2.0 */
 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
21typedef struct {
22	unsigned long seg;
23} mm_segment_t;
24
25#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
26
27#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
28/*
29 * Get/set the SFC/DFC registers for MOVES instructions
30 */
31#define USER_DS		MAKE_MM_SEG(__USER_DS)
32#define KERNEL_DS	MAKE_MM_SEG(__KERNEL_DS)
33
34static inline mm_segment_t get_fs(void)
35{
36	mm_segment_t _v;
37	__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
38	return _v;
39}
40
41static 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");
46}
47
48#else
49#define USER_DS		MAKE_MM_SEG(TASK_SIZE)
50#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
51#define get_fs()	(current_thread_info()->addr_limit)
52#define set_fs(x)	(current_thread_info()->addr_limit = (x))
53#endif
54
55#define segment_eq(a, b) ((a).seg == (b).seg)
56
57#endif /* __ASSEMBLY__ */
58
59#endif /* _M68K_SEGMENT_H */

 1/* SPDX-License-Identifier: GPL-2.0 */
 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
21typedef struct {
22	unsigned long seg;
23} mm_segment_t;
24
25#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
26
27#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
28/*
29 * Get/set the SFC/DFC registers for MOVES instructions
30 */
31#define USER_DS		MAKE_MM_SEG(__USER_DS)
32#define KERNEL_DS	MAKE_MM_SEG(__KERNEL_DS)
33
34static inline mm_segment_t get_fs(void)
35{
36	mm_segment_t _v;
37	__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
38	return _v;
39}
40
41static 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");
46}
47
48#else
49#define USER_DS		MAKE_MM_SEG(TASK_SIZE)
50#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
51#define get_fs()	(current_thread_info()->addr_limit)
52#define set_fs(x)	(current_thread_info()->addr_limit = (x))
53#endif
54
55#define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)
56
57#endif /* __ASSEMBLY__ */
58
59#endif /* _M68K_SEGMENT_H */