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 segment_eq(a, b) ((a).seg == (b).seg) 28 29 30#define get_fs() (current_thread_info()->addr_limit) 31#define set_fs(x) (current_thread_info()->addr_limit = (x)) 32 33#endif /* __ASSEMBLY__ */ 34#endif /* __ASM_SH_SEGMENT_H */ 35