Revert "Remove unused define"

[fio.git] / arch / arch-ia64.h

diff --git a/arch/arch-ia64.h b/arch/arch-ia64.h
index 6dd8196d2e49231bf97bb4a651cd4b8571e886c8..d9afc32e702389ab0cc94fae80f696bf3a30d501 100644 (file)
--- a/arch/arch-ia64.h
+++ b/arch/arch-ia64.h
@@ -20,6 +20,7 @@
 
 #define nop            asm volatile ("hint @pause" ::: "memory");
 #define read_barrier() asm volatile ("mf" ::: "memory")
+#define writebarrier() asm volatile ("mf" ::: "memory")
 
 #define ia64_popcnt(x)                                                 \
 ({                                                                     \
@@ -34,4 +35,38 @@ static inline unsigned long arch_ffz(unsigned long bitmask)
 }
 #define ARCH_HAVE_FFZ
 
+typedef struct {
+       volatile unsigned int lock;
+} spinlock_t;
+
+#define IA64_SPINLOCK_CLOBBERS "ar.ccv", "ar.pfs", "p14", "p15", "r27", "r28", "r29", "r30", "b6", "memory"
+
+static inline void spin_lock(spinlock_t *lock)
+{
+       register volatile unsigned int *ptr asm ("r31") = &lock->lock;
+       unsigned long flags = 0;
+
+       __asm__ __volatile__("{\n\t"
+                       "  mov ar.ccv = r0\n\t"
+                       "  mov r28 = ip\n\t"
+                       "  mov r30 = 1;;\n\t"
+                       "}\n\t"
+                       "cmpxchg4.acq r30 = [%1], r30, ar.ccv\n\t"
+                       "movl r29 = ia64_spinlock_contention_pre3_4;;\n\t"
+                       "cmp4.ne p14, p0 = r30, r0\n\t"
+                       "mov b6 = r29;;\n\t"
+                       "mov r27=%2\n\t"
+                       "(p14) br.cond.spnt.many b6"
+                       : "=r"(ptr) : "r"(ptr), "r" (flags)
+                       : IA64_SPINLOCK_CLOBBERS);
+}
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+       read_barrier();
+       __asm__ __volatile__("st4.rel.nta [%0] = r0\n\t" :: "r" (lock));
+}
+
+#define __SPIN_LOCK_UNLOCKED   { 0 }
+
 #endif