/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _M68K_SEGMENT_H #define _M68K_SEGMENT_H /* define constants */ /* Address spaces (FC0-FC2) */ #define USER_DATA (1) #ifndef __USER_DS #define __USER_DS (USER_DATA) #endif #define USER_PROGRAM (2) #define SUPER_DATA (5) #ifndef __KERNEL_DS #define __KERNEL_DS (SUPER_DATA) #endif #define SUPER_PROGRAM (6) #define CPU_SPACE (7) #ifndef __ASSEMBLY__ typedef struct { unsigned long seg; } mm_segment_t; #define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) #ifdef [31mCONFIG_CPU_HAS_ADDRESS_SPACES[0m /* * Get/set the SFC/DFC registers for MOVES instructions */ #define USER_DS MAKE_MM_SEG(__USER_DS) #define KERNEL_DS MAKE_MM_SEG(__KERNEL_DS) static inline mm_segment_t get_fs(void) { mm_segment_t _v; __asm__ ("movec %/dfc,%0":"=r" (_v.seg):); return _v; } static inline void set_fs(mm_segment_t val) { __asm__ __volatile__ ("movec %0,%/sfc\n\t" "movec %0,%/dfc\n\t" : /* no outputs */ : "r" (val.seg) : "memory"); } #else #define USER_DS MAKE_MM_SEG(TASK_SIZE) #define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFF) #define get_fs() (current_thread_info()->addr_limit) #define set_fs(x) (current_thread_info()->addr_limit = (x)) #endif #define segment_eq(a, b) ((a).seg == (b).seg) #endif /* __ASSEMBLY__ */ #endif /* _M68K_SEGMENT_H */ |