Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef _M68K_SEGMENT_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define _M68K_SEGMENT_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) /* define constants */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) /* Address spaces (FC0-FC2) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #define USER_DATA     (1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #ifndef __USER_DS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #define __USER_DS     (USER_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define USER_PROGRAM  (2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #define SUPER_DATA    (5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #ifndef __KERNEL_DS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define __KERNEL_DS   (SUPER_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define SUPER_PROGRAM (6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define CPU_SPACE     (7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #ifndef __ASSEMBLY__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) typedef struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	unsigned long seg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) } mm_segment_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  * Get/set the SFC/DFC registers for MOVES instructions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define USER_DS		MAKE_MM_SEG(__USER_DS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define KERNEL_DS	MAKE_MM_SEG(__KERNEL_DS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) static inline mm_segment_t get_fs(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	mm_segment_t _v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	return _v;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static inline void set_fs(mm_segment_t val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	__asm__ __volatile__ ("movec %0,%/sfc\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 			      "movec %0,%/dfc\n\t"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 			      : /* no outputs */ : "r" (val.seg) : "memory");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define USER_DS		MAKE_MM_SEG(TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define get_fs()	(current_thread_info()->addr_limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define set_fs(x)	(current_thread_info()->addr_limit = (x))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #endif /* __ASSEMBLY__ */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #endif /* _M68K_SEGMENT_H */