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-rw-r--r--arch/sparc/include/asm/smpprim.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/smpprim.h b/arch/sparc/include/asm/smpprim.h
new file mode 100644
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+++ b/arch/sparc/include/asm/smpprim.h
@@ -0,0 +1,54 @@
+/*
+ * smpprim.h: SMP locking primitives on the Sparc
+ *
+ * God knows we won't be actually using this code for some time
+ * but I thought I'd write it since I knew how.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef __SPARC_SMPPRIM_H
+#define __SPARC_SMPPRIM_H
+
+/* Test and set the unsigned byte at ADDR to 1. Returns the previous
+ * value. On the Sparc we use the ldstub instruction since it is
+ * atomic.
+ */
+
+static inline __volatile__ char test_and_set(void *addr)
+{
+ char state = 0;
+
+ __asm__ __volatile__("ldstub [%0], %1 ! test_and_set\n\t"
+ "=r" (addr), "=r" (state) :
+ "0" (addr), "1" (state) : "memory");
+
+ return state;
+}
+
+/* Initialize a spin-lock. */
+static inline __volatile__ smp_initlock(void *spinlock)
+{
+ /* Unset the lock. */
+ *((unsigned char *) spinlock) = 0;
+
+ return;
+}
+
+/* This routine spins until it acquires the lock at ADDR. */
+static inline __volatile__ smp_lock(void *addr)
+{
+ while(test_and_set(addr) == 0xff)
+ ;
+
+ /* We now have the lock */
+ return;
+}
+
+/* This routine releases the lock at ADDR. */
+static inline __volatile__ smp_unlock(void *addr)
+{
+ *((unsigned char *) addr) = 0;
+}
+
+#endif /* !(__SPARC_SMPPRIM_H) */
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