Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
 
#ifndef __ASM_CSKY_CMPXCHG_H
#define __ASM_CSKY_CMPXCHG_H
 
#ifdef CONFIG_CPU_HAS_LDSTEX
#include <asm/barrier.h>
 
extern void __bad_xchg(void);
 
#define __xchg(new, ptr, size)					\
({								\
<------>__typeof__(ptr) __ptr = (ptr);				\
<------>__typeof__(new) __new = (new);				\
<------>__typeof__(*(ptr)) __ret;				\
<------>unsigned long tmp;					\
<------>switch (size) {						\
<------>case 4:							\
<------><------>smp_mb();					\
<------><------>asm volatile (					\
<------><------>"1:	ldex.w		%0, (%3) \n"		\
<------><------>"	mov		%1, %2   \n"		\
<------><------>"	stex.w		%1, (%3) \n"		\
<------><------>"	bez		%1, 1b   \n"		\
<------><------><------>: "=&r" (__ret), "=&r" (tmp)		\
<------><------><------>: "r" (__new), "r"(__ptr)		\
<------><------><------>:);					\
<------><------>smp_mb();					\
<------><------>break;						\
<------>default:						\
<------><------>__bad_xchg();					\
<------>}							\
<------>__ret;							\
})
 
#define xchg(ptr, x)	(__xchg((x), (ptr), sizeof(*(ptr))))
 
#define __cmpxchg(ptr, old, new, size)				\
({								\
<------>__typeof__(ptr) __ptr = (ptr);				\
<------>__typeof__(new) __new = (new);				\
<------>__typeof__(new) __tmp;					\
<------>__typeof__(old) __old = (old);				\
<------>__typeof__(*(ptr)) __ret;				\
<------>switch (size) {						\
<------>case 4:							\
<------><------>smp_mb();					\
<------><------>asm volatile (					\
<------><------>"1:	ldex.w		%0, (%3) \n"		\
<------><------>"	cmpne		%0, %4   \n"		\
<------><------>"	bt		2f       \n"		\
<------><------>"	mov		%1, %2   \n"		\
<------><------>"	stex.w		%1, (%3) \n"		\
<------><------>"	bez		%1, 1b   \n"		\
<------><------>"2:				 \n"		\
<------><------><------>: "=&r" (__ret), "=&r" (__tmp)		\
<------><------><------>: "r" (__new), "r"(__ptr), "r"(__old)	\
<------><------><------>:);					\
<------><------>smp_mb();					\
<------><------>break;						\
<------>default:						\
<------><------>__bad_xchg();					\
<------>}							\
<------>__ret;							\
})
 
#define cmpxchg(ptr, o, n) \
<------>(__cmpxchg((ptr), (o), (n), sizeof(*(ptr))))
#else
#include <asm-generic/cmpxchg.h>
#endif
 
#endif /* __ASM_CSKY_CMPXCHG_H */