From 024b246ed24492d6c2ee14c34d742b137fce1b94 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Fri, 15 Aug 2008 09:19:40 -0700
Subject: alpha: move include/asm-alpha to arch/alpha/include/asm

Sam Ravnborg did the build-test that the direct header file move works,
I'm just committing it.

This is a pure move:

	mkdir arch/alpha/include
	git mv include/asm-alpha arch/alpha/include/asm

with no other changes.

Requested-and-tested-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/alpha/include/asm/spinlock.h | 173 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 arch/alpha/include/asm/spinlock.h

(limited to 'arch/alpha/include/asm/spinlock.h')

diff --git a/arch/alpha/include/asm/spinlock.h b/arch/alpha/include/asm/spinlock.h
new file mode 100644
index 0000000..aeeb125
--- /dev/null
+++ b/arch/alpha/include/asm/spinlock.h
@@ -0,0 +1,173 @@
+#ifndef _ALPHA_SPINLOCK_H
+#define _ALPHA_SPINLOCK_H
+
+#include <asm/system.h>
+#include <linux/kernel.h>
+#include <asm/current.h>
+
+/*
+ * Simple spin lock operations.  There are two variants, one clears IRQ's
+ * on the local processor, one does not.
+ *
+ * We make no fairness assumptions. They have a cost.
+ */
+
+#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
+#define __raw_spin_is_locked(x)	((x)->lock != 0)
+#define __raw_spin_unlock_wait(x) \
+		do { cpu_relax(); } while ((x)->lock)
+
+static inline void __raw_spin_unlock(raw_spinlock_t * lock)
+{
+	mb();
+	lock->lock = 0;
+}
+
+static inline void __raw_spin_lock(raw_spinlock_t * lock)
+{
+	long tmp;
+
+	__asm__ __volatile__(
+	"1:	ldl_l	%0,%1\n"
+	"	bne	%0,2f\n"
+	"	lda	%0,1\n"
+	"	stl_c	%0,%1\n"
+	"	beq	%0,2f\n"
+	"	mb\n"
+	".subsection 2\n"
+	"2:	ldl	%0,%1\n"
+	"	bne	%0,2b\n"
+	"	br	1b\n"
+	".previous"
+	: "=&r" (tmp), "=m" (lock->lock)
+	: "m"(lock->lock) : "memory");
+}
+
+static inline int __raw_spin_trylock(raw_spinlock_t *lock)
+{
+	return !test_and_set_bit(0, &lock->lock);
+}
+
+/***********************************************************/
+
+static inline int __raw_read_can_lock(raw_rwlock_t *lock)
+{
+	return (lock->lock & 1) == 0;
+}
+
+static inline int __raw_write_can_lock(raw_rwlock_t *lock)
+{
+	return lock->lock == 0;
+}
+
+static inline void __raw_read_lock(raw_rwlock_t *lock)
+{
+	long regx;
+
+	__asm__ __volatile__(
+	"1:	ldl_l	%1,%0\n"
+	"	blbs	%1,6f\n"
+	"	subl	%1,2,%1\n"
+	"	stl_c	%1,%0\n"
+	"	beq	%1,6f\n"
+	"	mb\n"
+	".subsection 2\n"
+	"6:	ldl	%1,%0\n"
+	"	blbs	%1,6b\n"
+	"	br	1b\n"
+	".previous"
+	: "=m" (*lock), "=&r" (regx)
+	: "m" (*lock) : "memory");
+}
+
+static inline void __raw_write_lock(raw_rwlock_t *lock)
+{
+	long regx;
+
+	__asm__ __volatile__(
+	"1:	ldl_l	%1,%0\n"
+	"	bne	%1,6f\n"
+	"	lda	%1,1\n"
+	"	stl_c	%1,%0\n"
+	"	beq	%1,6f\n"
+	"	mb\n"
+	".subsection 2\n"
+	"6:	ldl	%1,%0\n"
+	"	bne	%1,6b\n"
+	"	br	1b\n"
+	".previous"
+	: "=m" (*lock), "=&r" (regx)
+	: "m" (*lock) : "memory");
+}
+
+static inline int __raw_read_trylock(raw_rwlock_t * lock)
+{
+	long regx;
+	int success;
+
+	__asm__ __volatile__(
+	"1:	ldl_l	%1,%0\n"
+	"	lda	%2,0\n"
+	"	blbs	%1,2f\n"
+	"	subl	%1,2,%2\n"
+	"	stl_c	%2,%0\n"
+	"	beq	%2,6f\n"
+	"2:	mb\n"
+	".subsection 2\n"
+	"6:	br	1b\n"
+	".previous"
+	: "=m" (*lock), "=&r" (regx), "=&r" (success)
+	: "m" (*lock) : "memory");
+
+	return success;
+}
+
+static inline int __raw_write_trylock(raw_rwlock_t * lock)
+{
+	long regx;
+	int success;
+
+	__asm__ __volatile__(
+	"1:	ldl_l	%1,%0\n"
+	"	lda	%2,0\n"
+	"	bne	%1,2f\n"
+	"	lda	%2,1\n"
+	"	stl_c	%2,%0\n"
+	"	beq	%2,6f\n"
+	"2:	mb\n"
+	".subsection 2\n"
+	"6:	br	1b\n"
+	".previous"
+	: "=m" (*lock), "=&r" (regx), "=&r" (success)
+	: "m" (*lock) : "memory");
+
+	return success;
+}
+
+static inline void __raw_read_unlock(raw_rwlock_t * lock)
+{
+	long regx;
+	__asm__ __volatile__(
+	"	mb\n"
+	"1:	ldl_l	%1,%0\n"
+	"	addl	%1,2,%1\n"
+	"	stl_c	%1,%0\n"
+	"	beq	%1,6f\n"
+	".subsection 2\n"
+	"6:	br	1b\n"
+	".previous"
+	: "=m" (*lock), "=&r" (regx)
+	: "m" (*lock) : "memory");
+}
+
+static inline void __raw_write_unlock(raw_rwlock_t * lock)
+{
+	mb();
+	lock->lock = 0;
+}
+
+#define _raw_spin_relax(lock)	cpu_relax()
+#define _raw_read_relax(lock)	cpu_relax()
+#define _raw_write_relax(lock)	cpu_relax()
+
+#endif /* _ALPHA_SPINLOCK_H */
-- 
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