summaryrefslogtreecommitdiffstats
path: root/arch/tile/include/asm/cmpxchg.h
diff options
context:
space:
mode:
Diffstat (limited to 'arch/tile/include/asm/cmpxchg.h')
-rw-r--r--arch/tile/include/asm/cmpxchg.h97
1 files changed, 73 insertions, 24 deletions
diff --git a/arch/tile/include/asm/cmpxchg.h b/arch/tile/include/asm/cmpxchg.h
index 1da5bfbd8c61..4001d5eab4bb 100644
--- a/arch/tile/include/asm/cmpxchg.h
+++ b/arch/tile/include/asm/cmpxchg.h
@@ -20,59 +20,108 @@
#ifndef __ASSEMBLY__
-/* Nonexistent functions intended to cause link errors. */
-extern unsigned long __xchg_called_with_bad_pointer(void);
-extern unsigned long __cmpxchg_called_with_bad_pointer(void);
+#include <asm/barrier.h>
-#define xchg(ptr, x) \
+/* Nonexistent functions intended to cause compile errors. */
+extern void __xchg_called_with_bad_pointer(void)
+ __compiletime_error("Bad argument size for xchg");
+extern void __cmpxchg_called_with_bad_pointer(void)
+ __compiletime_error("Bad argument size for cmpxchg");
+
+#ifndef __tilegx__
+
+/* Note the _atomic_xxx() routines include a final mb(). */
+int _atomic_xchg(int *ptr, int n);
+int _atomic_xchg_add(int *v, int i);
+int _atomic_xchg_add_unless(int *v, int a, int u);
+int _atomic_cmpxchg(int *ptr, int o, int n);
+u64 _atomic64_xchg(u64 *v, u64 n);
+u64 _atomic64_xchg_add(u64 *v, u64 i);
+u64 _atomic64_xchg_add_unless(u64 *v, u64 a, u64 u);
+u64 _atomic64_cmpxchg(u64 *v, u64 o, u64 n);
+
+#define xchg(ptr, n) \
+ ({ \
+ if (sizeof(*(ptr)) != 4) \
+ __xchg_called_with_bad_pointer(); \
+ smp_mb(); \
+ (typeof(*(ptr)))_atomic_xchg((int *)(ptr), (int)(n)); \
+ })
+
+#define cmpxchg(ptr, o, n) \
+ ({ \
+ if (sizeof(*(ptr)) != 4) \
+ __cmpxchg_called_with_bad_pointer(); \
+ smp_mb(); \
+ (typeof(*(ptr)))_atomic_cmpxchg((int *)ptr, (int)o, (int)n); \
+ })
+
+#define xchg64(ptr, n) \
+ ({ \
+ if (sizeof(*(ptr)) != 8) \
+ __xchg_called_with_bad_pointer(); \
+ smp_mb(); \
+ (typeof(*(ptr)))_atomic64_xchg((u64 *)(ptr), (u64)(n)); \
+ })
+
+#define cmpxchg64(ptr, o, n) \
+ ({ \
+ if (sizeof(*(ptr)) != 8) \
+ __cmpxchg_called_with_bad_pointer(); \
+ smp_mb(); \
+ (typeof(*(ptr)))_atomic64_cmpxchg((u64 *)ptr, (u64)o, (u64)n); \
+ })
+
+#else
+
+#define xchg(ptr, n) \
({ \
typeof(*(ptr)) __x; \
+ smp_mb(); \
switch (sizeof(*(ptr))) { \
case 4: \
- __x = (typeof(__x))(typeof(__x-__x))atomic_xchg( \
- (atomic_t *)(ptr), \
- (u32)(typeof((x)-(x)))(x)); \
+ __x = (typeof(__x))(unsigned long) \
+ __insn_exch4((ptr), (u32)(unsigned long)(n)); \
break; \
case 8: \
- __x = (typeof(__x))(typeof(__x-__x))atomic64_xchg( \
- (atomic64_t *)(ptr), \
- (u64)(typeof((x)-(x)))(x)); \
+ __x = (typeof(__x)) \
+ __insn_exch((ptr), (unsigned long)(n)); \
break; \
default: \
__xchg_called_with_bad_pointer(); \
+ break; \
} \
+ smp_mb(); \
__x; \
})
#define cmpxchg(ptr, o, n) \
({ \
typeof(*(ptr)) __x; \
+ __insn_mtspr(SPR_CMPEXCH_VALUE, (unsigned long)(o)); \
+ smp_mb(); \
switch (sizeof(*(ptr))) { \
case 4: \
- __x = (typeof(__x))(typeof(__x-__x))atomic_cmpxchg( \
- (atomic_t *)(ptr), \
- (u32)(typeof((o)-(o)))(o), \
- (u32)(typeof((n)-(n)))(n)); \
+ __x = (typeof(__x))(unsigned long) \
+ __insn_cmpexch4((ptr), (u32)(unsigned long)(n)); \
break; \
case 8: \
- __x = (typeof(__x))(typeof(__x-__x))atomic64_cmpxchg( \
- (atomic64_t *)(ptr), \
- (u64)(typeof((o)-(o)))(o), \
- (u64)(typeof((n)-(n)))(n)); \
+ __x = (typeof(__x))__insn_cmpexch((ptr), (u64)(n)); \
break; \
default: \
__cmpxchg_called_with_bad_pointer(); \
+ break; \
} \
+ smp_mb(); \
__x; \
})
-#define tas(ptr) (xchg((ptr), 1))
+#define xchg64 xchg
+#define cmpxchg64 cmpxchg
-#define cmpxchg64(ptr, o, n) \
-({ \
- BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
- cmpxchg((ptr), (o), (n)); \
-})
+#endif
+
+#define tas(ptr) xchg((ptr), 1)
#endif /* __ASSEMBLY__ */