Revert "Remove unused define"

[fio.git] / arch / arch-sparc.h

diff --git a/arch/arch-sparc.h b/arch/arch-sparc.h
index be3b394a74c44b4d669e13bd0cd612e33cb4661f..de675daeba0fb497c732a4028b5a6930a3e1e159 100644 (file)
--- a/arch/arch-sparc.h
+++ b/arch/arch-sparc.h
@@ -21,5 +21,35 @@
 #define nop    do { } while (0)
 
 #define read_barrier() __asm__ __volatile__ ("" : : : "memory")
+#define write_barrier()        __asm__ __volatile__ ("" : : : "memory")
+
+typedef struct {
+       volatile unsigned char lock;
+} spinlock_t;
+
+static inline void spin_lock(spinlock_t *lock)
+{
+       __asm__ __volatile__(
+               "\n1:\n\t"
+               "ldstub [%0], %%g2\n\t"
+               "orcc   %%g2, 0x0, %%g0\n\t"
+               "bne,a  2f\n\t"
+               " ldub  [%0], %%g2\n\t"
+               ".subsection    2\n"
+               "2:\n\t"
+               "orcc   %%g2, 0x0, %%g0\n\t"
+               "bne,a  2b\n\t"
+               " ldub  [%0], %%g2\n\t"
+               "b,a    1b\n\t"
+               ".previous\n"
+               : /* no outputs */
+               : "r" (lock)
+               : "g2", "memory", "cc");
+}
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+       __asm__ __volatile__("stb %%g0, [%0]" : : "r" (lock) : "memory");
+}
 
 #endif