1 files changed, 225 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/spinlock_64.h b/arch/sparc/include/asm/spinlock_64.h
new file mode 100644
index 000000000..968917694
--- /dev/null
+++ b/arch/sparc/include/asm/spinlock_64.h
@@ -0,0 +1,225 @@
+/* spinlock.h: 64-bit Sparc spinlock support.
+ *
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#ifndef __SPARC64_SPINLOCK_H
+#define __SPARC64_SPINLOCK_H
+
+#ifndef __ASSEMBLY__
+
+/* To get debugging spinlocks which detect and catch
+ * deadlock situations, set CONFIG_DEBUG_SPINLOCK
+ * and rebuild your kernel.
+ */
+
+/* Because we play games to save cycles in the non-contention case, we
+ * need to be extra careful about branch targets into the "spinning"
+ * code.  They live in their own section, but the newer V9 branches
+ * have a shorter range than the traditional 32-bit sparc branch
+ * variants.  The rule is that the branches that go into and out of
+ * the spinner sections must be pre-V9 branches.
+ */
+
+#define arch_spin_is_locked(lp)	((lp)->lock != 0)
+
+#define arch_spin_unlock_wait(lp)	\
+	do {	rmb();			\
+	} while((lp)->lock)
+
+static inline void arch_spin_lock(arch_spinlock_t *lock)
+{
+	unsigned long tmp;
+
+	__asm__ __volatile__(
+"1:	ldstub		[%1], %0\n"
+"	brnz,pn		%0, 2f\n"
+"	 nop\n"
+"	.subsection	2\n"
+"2:	ldub		[%1], %0\n"
+"	brnz,pt		%0, 2b\n"
+"	 nop\n"
+"	ba,a,pt		%%xcc, 1b\n"
+"	.previous"
+	: "=&r" (tmp)
+	: "r" (lock)
+	: "memory");
+}
+
+static inline int arch_spin_trylock(arch_spinlock_t *lock)
+{
+	unsigned long result;
+
+	__asm__ __volatile__(
+"	ldstub		[%1], %0\n"
+	: "=r" (result)
+	: "r" (lock)
+	: "memory");
+
+	return (result == 0UL);
+}
+
+static inline void arch_spin_unlock(arch_spinlock_t *lock)
+{
+	__asm__ __volatile__(
+"	stb		%%g0, [%0]"
+	: /* No outputs */
+	: "r" (lock)
+	: "memory");
+}
+
+static inline void arch_spin_lock_flags(arch_spinlock_t *lock, unsigned long flags)
+{
+	unsigned long tmp1, tmp2;
+
+	__asm__ __volatile__(
+"1:	ldstub		[%2], %0\n"
+"	brnz,pn		%0, 2f\n"
+"	 nop\n"
+"	.subsection	2\n"
+"2:	rdpr		%%pil, %1\n"
+"	wrpr		%3, %%pil\n"
+"3:	ldub		[%2], %0\n"
+"	brnz,pt		%0, 3b\n"
+"	 nop\n"
+"	ba,pt		%%xcc, 1b\n"
+"	 wrpr		%1, %%pil\n"
+"	.previous"
+	: "=&r" (tmp1), "=&r" (tmp2)
+	: "r"(lock), "r"(flags)
+	: "memory");
+}
+
+/* Multi-reader locks, these are much saner than the 32-bit Sparc ones... */
+
+static void inline arch_read_lock(arch_rwlock_t *lock)
+{
+	unsigned long tmp1, tmp2;
+
+	__asm__ __volatile__ (
+"1:	ldsw		[%2], %0\n"
+"	brlz,pn		%0, 2f\n"
+"4:	 add		%0, 1, %1\n"
+"	cas		[%2], %0, %1\n"
+"	cmp		%0, %1\n"
+"	bne,pn		%%icc, 1b\n"
+"	 nop\n"
+"	.subsection	2\n"
+"2:	ldsw		[%2], %0\n"
+"	brlz,pt		%0, 2b\n"
+"	 nop\n"
+"	ba,a,pt		%%xcc, 4b\n"
+"	.previous"
+	: "=&r" (tmp1), "=&r" (tmp2)
+	: "r" (lock)
+	: "memory");
+}
+
+static int inline arch_read_trylock(arch_rwlock_t *lock)
+{
+	int tmp1, tmp2;
+
+	__asm__ __volatile__ (
+"1:	ldsw		[%2], %0\n"
+"	brlz,a,pn	%0, 2f\n"
+"	 mov		0, %0\n"
+"	add		%0, 1, %1\n"
+"	cas		[%2], %0, %1\n"
+"	cmp		%0, %1\n"
+"	bne,pn		%%icc, 1b\n"
+"	 mov		1, %0\n"
+"2:"
+	: "=&r" (tmp1), "=&r" (tmp2)
+	: "r" (lock)
+	: "memory");
+
+	return tmp1;
+}
+
+static void inline arch_read_unlock(arch_rwlock_t *lock)
+{
+	unsigned long tmp1, tmp2;
+
+	__asm__ __volatile__(
+"1:	lduw	[%2], %0\n"
+"	sub	%0, 1, %1\n"
+"	cas	[%2], %0, %1\n"
+"	cmp	%0, %1\n"
+"	bne,pn	%%xcc, 1b\n"
+"	 nop"
+	: "=&r" (tmp1), "=&r" (tmp2)
+	: "r" (lock)
+	: "memory");
+}
+
+static void inline arch_write_lock(arch_rwlock_t *lock)
+{
+	unsigned long mask, tmp1, tmp2;
+
+	mask = 0x80000000UL;
+
+	__asm__ __volatile__(
+"1:	lduw		[%2], %0\n"
+"	brnz,pn		%0, 2f\n"
+"4:	 or		%0, %3, %1\n"
+"	cas		[%2], %0, %1\n"
+"	cmp		%0, %1\n"
+"	bne,pn		%%icc, 1b\n"
+"	 nop\n"
+"	.subsection	2\n"
+"2:	lduw		[%2], %0\n"
+"	brnz,pt		%0, 2b\n"
+"	 nop\n"
+"	ba,a,pt		%%xcc, 4b\n"
+"	.previous"
+	: "=&r" (tmp1), "=&r" (tmp2)
+	: "r" (lock), "r" (mask)
+	: "memory");
+}
+
+static void inline arch_write_unlock(arch_rwlock_t *lock)
+{
+	__asm__ __volatile__(
+"	stw		%%g0, [%0]"
+	: /* no outputs */
+	: "r" (lock)
+	: "memory");
+}
+
+static int inline arch_write_trylock(arch_rwlock_t *lock)
+{
+	unsigned long mask, tmp1, tmp2, result;
+
+	mask = 0x80000000UL;
+
+	__asm__ __volatile__(
+"	mov		0, %2\n"
+"1:	lduw		[%3], %0\n"
+"	brnz,pn		%0, 2f\n"
+"	 or		%0, %4, %1\n"
+"	cas		[%3], %0, %1\n"
+"	cmp		%0, %1\n"
+"	bne,pn		%%icc, 1b\n"
+"	 nop\n"
+"	mov		1, %2\n"
+"2:"
+	: "=&r" (tmp1), "=&r" (tmp2), "=&r" (result)
+	: "r" (lock), "r" (mask)
+	: "memory");
+
+	return result;
+}
+
+#define arch_read_lock_flags(p, f) arch_read_lock(p)
+#define arch_write_lock_flags(p, f) arch_write_lock(p)
+
+#define arch_read_can_lock(rw)		(!((rw)->lock & 0x80000000UL))
+#define arch_write_can_lock(rw)	(!(rw)->lock)
+
+#define arch_spin_relax(lock)	cpu_relax()
+#define arch_read_relax(lock)	cpu_relax()
+#define arch_write_relax(lock)	cpu_relax()
+
+#endif /* !(__ASSEMBLY__) */
+
+#endif /* !(__SPARC64_SPINLOCK_H) */