diff options
Diffstat (limited to 'arch/csky/include/asm/cmpxchg.h')
| -rw-r--r-- | arch/csky/include/asm/cmpxchg.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/csky/include/asm/cmpxchg.h b/arch/csky/include/asm/cmpxchg.h new file mode 100644 index 0000000000..916043b845 --- /dev/null +++ b/arch/csky/include/asm/cmpxchg.h @@ -0,0 +1,155 @@ +/* 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> + +#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 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 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 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 */ |