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 __ASM_SH_CMPXCHG_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define __ASM_SH_CMPXCHG_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Atomic operations that C can't guarantee us.  Useful for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * resource counting etc..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #if defined(CONFIG_GUSA_RB)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/cmpxchg-grb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #elif defined(CONFIG_CPU_SH4A)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <asm/cmpxchg-llsc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <asm/cmpxchg-cas.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <asm/cmpxchg-irq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) extern void __xchg_called_with_bad_pointer(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define __xchg(ptr, x, size)				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) ({							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	unsigned long __xchg__res;			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	volatile void *__xchg_ptr = (ptr);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	switch (size) {					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	case 4:						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 		__xchg__res = xchg_u32(__xchg_ptr, x);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		break;					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	case 2:						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		__xchg__res = xchg_u16(__xchg_ptr, x);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		break;					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	case 1:						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		__xchg__res = xchg_u8(__xchg_ptr, x);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		break;					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	default:					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		__xchg_called_with_bad_pointer();	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		__xchg__res = x;			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		break;					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	}						\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 							\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	__xchg__res;					\
^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) #define xchg(ptr,x)	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* This function doesn't exist, so you'll get a linker error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)  * if something tries to do an invalid cmpxchg(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) extern void __cmpxchg_called_with_bad_pointer(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		unsigned long new, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	switch (size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	case 4:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 		return __cmpxchg_u32(ptr, old, new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	__cmpxchg_called_with_bad_pointer();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	return old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define cmpxchg(ptr,o,n)						 \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)   ({									 \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)      __typeof__(*(ptr)) _o_ = (o);					 \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)      __typeof__(*(ptr)) _n_ = (n);					 \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)      (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 				    (unsigned long)_n_, sizeof(*(ptr))); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)   })
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #endif /* __ASM_SH_CMPXCHG_H */