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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_CSKY_CMPXCHG_H
#define __ASM_CSKY_CMPXCHG_H
#ifdef CONFIG_SMP
#include <linux/bug.h>
#include <asm/barrier.h>
#include <linux/cmpxchg-emu.h>
#define __xchg_relaxed(new, ptr, size) \
({ \
__typeof__(ptr) __ptr = (ptr); \
__typeof__(new) __new = (new); \
__typeof__(*(ptr)) __ret; \
unsigned long tmp; \
switch (size) { \
case 2: { \
u32 ret; \
u32 shif = ((ulong)__ptr & 2) ? 16 : 0; \
u32 mask = 0xffff << shif; \
__ptr = (__typeof__(ptr))((ulong)__ptr & ~2); \
__asm__ __volatile__ ( \
"1: ldex.w %0, (%4)\n" \
" and %1, %0, %2\n" \
" or %1, %1, %3\n" \
" stex.w %1, (%4)\n" \
" bez %1, 1b\n" \
: "=&r" (ret), "=&r" (tmp) \
: "r" (~mask), \
"r" ((u32)__new << shif), \
"r" (__ptr) \
: "memory"); \
__ret = (__typeof__(*(ptr))) \
((ret & mask) >> shif); \
break; \
} \
case 4: \
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) \
:); \
break; \
default: \
BUILD_BUG(); \
} \
__ret; \
})
#define arch_xchg_relaxed(ptr, x) \
(__xchg_relaxed((x), (ptr), sizeof(*(ptr))))
#define __cmpxchg_relaxed(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 1: \
__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \
break; \
case 4: \
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) \
:); \
break; \
default: \
BUILD_BUG(); \
} \
__ret; \
})
#define arch_cmpxchg_relaxed(ptr, o, n) \
(__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr))))
#define __cmpxchg_acquire(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 1: \
__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \
break; \
case 4: \
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" \
ACQUIRE_FENCE \
"2: \n" \
: "=&r" (__ret), "=&r" (__tmp) \
: "r" (__new), "r"(__ptr), "r"(__old) \
:); \
break; \
default: \
BUILD_BUG(); \
} \
__ret; \
})
#define arch_cmpxchg_acquire(ptr, o, n) \
(__cmpxchg_acquire((ptr), (o), (n), 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 1: \
__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \
break; \
case 4: \
asm volatile ( \
RELEASE_FENCE \
"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" \
FULL_FENCE \
"2: \n" \
: "=&r" (__ret), "=&r" (__tmp) \
: "r" (__new), "r"(__ptr), "r"(__old) \
:); \
break; \
default: \
BUILD_BUG(); \
} \
__ret; \
})
#define arch_cmpxchg(ptr, o, n) \
(__cmpxchg((ptr), (o), (n), sizeof(*(ptr))))
#define arch_cmpxchg_local(ptr, o, n) \
(__cmpxchg_relaxed((ptr), (o), (n), sizeof(*(ptr))))
#else
#include <asm-generic/cmpxchg.h>
#endif
#endif /* __ASM_CSKY_CMPXCHG_H */
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