1 files changed, 173 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/spinlock.h b/arch/alpha/include/asm/spinlock.h
new file mode 100644
index 000000000000..aeeb125f6851
--- /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 */

diff --git a/arch/alpha/include/asm/spinlock.h b/arch/alpha/include/asm/spinlock.h new file mode 100644 index 000000000000..aeeb125f6851 --- /dev/null +++ b/arch/alpha/include/asm/spinlock.h
@@ -0,0 +1,173 @@
	1	#ifndef _ALPHA_SPINLOCK_H
	2	#define _ALPHA_SPINLOCK_H
	3
	4	#include <asm/system.h>
	5	#include <linux/kernel.h>
	6	#include <asm/current.h>
	7
	8	/*
	9	* Simple spin lock operations. There are two variants, one clears IRQ's
	10	* on the local processor, one does not.
	11	*
	12	* We make no fairness assumptions. They have a cost.
	13	*/
	14
	15	#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
	16	#define __raw_spin_is_locked(x) ((x)->lock != 0)
	17	#define __raw_spin_unlock_wait(x) \
	18	do { cpu_relax(); } while ((x)->lock)
	19
	20	static inline void __raw_spin_unlock(raw_spinlock_t * lock)
	21	{
	22	mb();
	23	lock->lock = 0;
	24	}
	25
	26	static inline void __raw_spin_lock(raw_spinlock_t * lock)
	27	{
	28	long tmp;
	29
	30	__asm__ __volatile__(
	31	"1: ldl_l %0,%1\n"
	32	" bne %0,2f\n"
	33	" lda %0,1\n"
	34	" stl_c %0,%1\n"
	35	" beq %0,2f\n"
	36	" mb\n"
	37	".subsection 2\n"
	38	"2: ldl %0,%1\n"
	39	" bne %0,2b\n"
	40	" br 1b\n"
	41	".previous"
	42	: "=&r" (tmp), "=m" (lock->lock)
	43	: "m"(lock->lock) : "memory");
	44	}
	45
	46	static inline int __raw_spin_trylock(raw_spinlock_t *lock)
	47	{
	48	return !test_and_set_bit(0, &lock->lock);
	49	}
	50
	51	/***********************************************************/
	52
	53	static inline int __raw_read_can_lock(raw_rwlock_t *lock)
	54	{
	55	return (lock->lock & 1) == 0;
	56	}
	57
	58	static inline int __raw_write_can_lock(raw_rwlock_t *lock)
	59	{
	60	return lock->lock == 0;
	61	}
	62
	63	static inline void __raw_read_lock(raw_rwlock_t *lock)
	64	{
	65	long regx;
	66
	67	__asm__ __volatile__(
	68	"1: ldl_l %1,%0\n"
	69	" blbs %1,6f\n"
	70	" subl %1,2,%1\n"
	71	" stl_c %1,%0\n"
	72	" beq %1,6f\n"
	73	" mb\n"
	74	".subsection 2\n"
	75	"6: ldl %1,%0\n"
	76	" blbs %1,6b\n"
	77	" br 1b\n"
	78	".previous"
	79	: "=m" (*lock), "=&r" (regx)
	80	: "m" (*lock) : "memory");
	81	}
	82
	83	static inline void __raw_write_lock(raw_rwlock_t *lock)
	84	{
	85	long regx;
	86
	87	__asm__ __volatile__(
	88	"1: ldl_l %1,%0\n"
	89	" bne %1,6f\n"
	90	" lda %1,1\n"
	91	" stl_c %1,%0\n"
	92	" beq %1,6f\n"
	93	" mb\n"
	94	".subsection 2\n"
	95	"6: ldl %1,%0\n"
	96	" bne %1,6b\n"
	97	" br 1b\n"
	98	".previous"
	99	: "=m" (*lock), "=&r" (regx)
	100	: "m" (*lock) : "memory");
	101	}
	102
	103	static inline int __raw_read_trylock(raw_rwlock_t * lock)
	104	{
	105	long regx;
	106	int success;
	107
	108	__asm__ __volatile__(
	109	"1: ldl_l %1,%0\n"
	110	" lda %2,0\n"
	111	" blbs %1,2f\n"
	112	" subl %1,2,%2\n"
	113	" stl_c %2,%0\n"
	114	" beq %2,6f\n"
	115	"2: mb\n"
	116	".subsection 2\n"
	117	"6: br 1b\n"
	118	".previous"
	119	: "=m" (*lock), "=&r" (regx), "=&r" (success)
	120	: "m" (*lock) : "memory");
	121
	122	return success;
	123	}
	124
	125	static inline int __raw_write_trylock(raw_rwlock_t * lock)
	126	{
	127	long regx;
	128	int success;
	129
	130	__asm__ __volatile__(
	131	"1: ldl_l %1,%0\n"
	132	" lda %2,0\n"
	133	" bne %1,2f\n"
	134	" lda %2,1\n"
	135	" stl_c %2,%0\n"
	136	" beq %2,6f\n"
	137	"2: mb\n"
	138	".subsection 2\n"
	139	"6: br 1b\n"
	140	".previous"
	141	: "=m" (*lock), "=&r" (regx), "=&r" (success)
	142	: "m" (*lock) : "memory");
	143
	144	return success;
	145	}
	146
	147	static inline void __raw_read_unlock(raw_rwlock_t * lock)
	148	{
	149	long regx;
	150	__asm__ __volatile__(
	151	" mb\n"
	152	"1: ldl_l %1,%0\n"
	153	" addl %1,2,%1\n"
	154	" stl_c %1,%0\n"
	155	" beq %1,6f\n"
	156	".subsection 2\n"
	157	"6: br 1b\n"
	158	".previous"
	159	: "=m" (*lock), "=&r" (regx)
	160	: "m" (*lock) : "memory");
	161	}
	162
	163	static inline void __raw_write_unlock(raw_rwlock_t * lock)
	164	{
	165	mb();
	166	lock->lock = 0;
	167	}
	168
	169	#define _raw_spin_relax(lock) cpu_relax()
	170	#define _raw_read_relax(lock) cpu_relax()
	171	#define _raw_write_relax(lock) cpu_relax()
	172
	173	#endif /* _ALPHA_SPINLOCK_H */