1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_SEGMENT_H
3#define __ASM_SH_SEGMENT_H
4
5#ifndef __ASSEMBLY__
6
7typedef struct {
8	unsigned long seg;
9} mm_segment_t;
10
11#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
12
13/*
14 * The fs value determines whether argument validity checking should be
15 * performed or not.  If get_fs() == USER_DS, checking is performed, with
16 * get_fs() == KERNEL_DS, checking is bypassed.
17 *
18 * For historical reasons, these macros are grossly misnamed.
19 */
20#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)
21#ifdef CONFIG_MMU
22#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)
23#else
24#define USER_DS		KERNEL_DS
25#endif
26
27#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
28
29#define get_fs()	(current_thread_info()->addr_limit)
30#define set_fs(x)	(current_thread_info()->addr_limit = (x))
31
32#endif /* __ASSEMBLY__ */
33#endif /* __ASM_SH_SEGMENT_H */
34