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-rw-r--r--arch/csky/include/asm/cmpxchg.h155
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 */