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 */ 60