+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 }
+