Import of Linux/MIPS 2.1.36

1 files changed, 77 insertions, 0 deletions

diff --git a/arch/sparc64/lib/locks.S b/arch/sparc64/lib/locks.S
new file mode 100644
index 000000000..a1154cb6d
--- /dev/null
+++ b/arch/sparc64/lib/locks.S
@@ -0,0 +1,77 @@
+/* $Id: locks.S,v 1.2 1997/03/10 12:28:02 jj Exp $
+ * locks.S: SMP low-level lock primitives on Sparc64.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/ptrace.h>
+
+	.text
+	.align	4
+
+	.globl	__spinlock_waitfor
+__spinlock_waitfor:
+1:	orcc	%g2, 0x0, %g0
+	bne	1b
+	 ldub	[%g1], %g2
+	ldstub	[%g1], %g2
+	jmpl	%o7 - 12, %g0
+	 mov	%g5, %o7
+
+	.globl	___become_idt
+___become_idt:
+#if 0 /* Don't know how to do this on the Ultra yet... */
+#endif
+	jmpl	%o7 + 8, %g0
+	 mov	%g5, %o7
+
+___lk_busy_spin:
+	orcc	%g2, 0, %g0
+	bne	___lk_busy_spin
+	 ldub	[%g1 + 0], %g2
+	b	1f
+	 ldstub	[%g1 + 0], %g2
+
+	.globl	___lock_kernel
+___lock_kernel:
+	addcc	%g2, -1, %g2
+	rdpr	%pil, %g3
+	bcs,a	9f
+	 st	%g2, [%g6 + AOFF_task_lock_depth]
+	wrpr	15, %pil
+	ldstub	[%g1 + 0], %g2
+1:	orcc	%g2, 0, %g0
+	bne,a	___lk_busy_spin
+	 ldub	[%g1 + 0], %g2
+	ldub	[%g1 + 2], %g2
+	cmp	%g2, %g5
+	be	2f
+	 stb	%g5, [%g1 + 1]
+	stb	%g5, [%g1 + 2]
+#ifdef __SMP__
+	/* XXX Figure out how to become interrupt receiver in SMP system. */
+#endif
+2:	mov	-1, %g2
+	st	%g2, [%g6 + AOFF_task_lock_depth]
+	wrpr	%g3, %pil
+9:	jmpl	%o7 + 0x8, %g0
+	 mov	%g5, %o7
+
+#undef NO_PROC_ID
+#define NO_PROC_ID	0xff
+
+	.globl	___unlock_kernel
+___unlock_kernel:
+	addcc	%g2, 1, %g2
+	rdpr	%pil, %g3
+	bne,a	1f
+	 st	%g2, [%g6 + AOFF_task_lock_depth]
+	wrpr	15, %pil
+	mov	NO_PROC_ID, %g2
+	stb	%g2, [%g1 + 1]
+	stb	%g0, [%g1 + 0]
+	st	%g0, [%g6 + AOFF_task_lock_depth]
+	wrpr	%g3, %pil
+1:	jmpl	%o7 + 0x8, %g0
+	 mov	%g5, %o7
+