Add spinlocks

[fio.git] / arch / arch-sparc64.h

diff --git a/arch/arch-sparc64.h b/arch/arch-sparc64.h
index 332cf9179388377ebfc12bf85458f1dd6b73d5ea..6ee8659716f4654a28a00f34fef4f1313191ca1d 100644 (file)
--- a/arch/arch-sparc64.h
+++ b/arch/arch-sparc64.h
@@ -30,4 +30,39 @@
 #define read_barrier()         membar_safe("#LoadLoad")
 #define write_barrier()                membar_safe("#StoreStore")
 
+typedef struct {
+       volatile unsigned char lock;
+} spinlock_t;
+
+static inline void spin_lock(spinlock_t *lock)
+{
+       unsigned long tmp;
+
+       __asm__ __volatile__(
+               "1:     ldstub          [%1], %0\n"
+               "       membar          #StoreLoad | #StoreStore\n"
+               "       brnz,pn         %0, 2f\n"
+               "        nop\n"
+               "       .subsection     2\n"
+               "2:     ldub            [%1], %0\n"
+               "       membar          #LoadLoad\n"
+               "       brnz,pt         %0, 2b\n"
+               "        nop\n"
+               "       ba,a,pt         %%xcc, 1b\n"
+               "       .previous"
+               : "=&r" (tmp)
+               : "r" (lock)
+               : "memory");
+}
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+       __asm__ __volatile__(
+               "       membar          #StoreStore | #LoadStore\n"
+               "       stb             %%g0, [%0]"
+               : /* No outputs */
+               : "r" (lock)
+               : "memory");
+}
+
 #endif