1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_SH_SEGMENT_H 3 #define __ASM_SH_SEGMENT_H 4 5 #ifndef __ASSEMBLY__ 6 7 typedef 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