From a439fe51a1f8eb087c22dd24d69cebae4a3addac Mon Sep 17 00:00:00 2001
From: Sam Ravnborg <sam@ravnborg.org>
Date: Sun, 27 Jul 2008 23:00:59 +0200
Subject: sparc, sparc64: use arch/sparc/include

The majority of this patch was created by the following script:

***
ASM=arch/sparc/include/asm
mkdir -p $ASM
git mv include/asm-sparc64/ftrace.h $ASM
git rm include/asm-sparc64/*
git mv include/asm-sparc/* $ASM
sed -ie 's/asm-sparc64/asm/g' $ASM/*
sed -ie 's/asm-sparc/asm/g' $ASM/*
***

The rest was an update of the top-level Makefile to use sparc
for header files when sparc64 is being build.
And a small fixlet to pick up the correct unistd.h from
sparc64 code.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 arch/sparc/include/asm/smpprim.h | 54 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 arch/sparc/include/asm/smpprim.h

(limited to 'arch/sparc/include/asm/smpprim.h')

diff --git a/arch/sparc/include/asm/smpprim.h b/arch/sparc/include/asm/smpprim.h
new file mode 100644
index 000000000000..eb849d862c64
--- /dev/null
+++ 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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