1 files changed, 110 insertions, 0 deletions
diff --git a/arch/sparc/lib/bitops.S b/arch/sparc/lib/bitops.S
new file mode 100644
index 00000000000..3e939976907
--- /dev/null
+++ b/arch/sparc/lib/bitops.S
@@ -0,0 +1,110 @@
+/* bitops.S: Low level assembler bit operations.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <linux/config.h>
+#include <asm/ptrace.h>
+#include <asm/psr.h>
+
+	.text
+	.align	4
+
+	.globl  __bitops_begin
+__bitops_begin:
+
+	/* Take bits in %g2 and set them in word at %g1,
+	 * return whether bits were set in original value
+	 * in %g2.  %g4 holds value to restore into %o7
+	 * in delay slot of jmpl return, %g3 + %g5 + %g7 can be
+	 * used as temporaries and thus is considered clobbered
+	 * by all callers.
+	 */
+	.globl	___set_bit
+___set_bit:
+	rd	%psr, %g3
+	nop; nop; nop;
+	or	%g3, PSR_PIL, %g5
+	wr	%g5, 0x0, %psr
+	nop; nop; nop
+#ifdef CONFIG_SMP
+	set	bitops_spinlock, %g5
+2:	ldstub	[%g5], %g7		! Spin on the byte lock for SMP.
+	orcc	%g7, 0x0, %g0		! Did we get it?
+	bne	2b			! Nope...
+#endif
+	 ld	[%g1], %g7
+	or	%g7, %g2, %g5
+	and	%g7, %g2, %g2
+#ifdef CONFIG_SMP
+	st	%g5, [%g1]
+	set	bitops_spinlock, %g5
+	stb	%g0, [%g5]
+#else
+	st	%g5, [%g1]
+#endif
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+	jmpl	%o7, %g0
+	 mov	%g4, %o7
+
+	/* Same as above, but clears the bits from %g2 instead. */
+	.globl	___clear_bit
+___clear_bit:
+	rd	%psr, %g3
+	nop; nop; nop
+	or	%g3, PSR_PIL, %g5
+	wr	%g5, 0x0, %psr
+	nop; nop; nop
+#ifdef CONFIG_SMP
+	set	bitops_spinlock, %g5
+2:	ldstub	[%g5], %g7		! Spin on the byte lock for SMP.
+	orcc	%g7, 0x0, %g0		! Did we get it?
+	bne	2b			! Nope...
+#endif
+	 ld	[%g1], %g7
+	andn	%g7, %g2, %g5
+	and	%g7, %g2, %g2
+#ifdef CONFIG_SMP
+	st	%g5, [%g1]
+	set	bitops_spinlock, %g5
+	stb	%g0, [%g5]
+#else
+	st	%g5, [%g1]
+#endif
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+	jmpl	%o7, %g0
+	 mov	%g4, %o7
+
+	/* Same thing again, but this time toggles the bits from %g2. */
+	.globl	___change_bit
+___change_bit:
+	rd	%psr, %g3
+	nop; nop; nop
+	or	%g3, PSR_PIL, %g5
+	wr	%g5, 0x0, %psr
+	nop; nop; nop
+#ifdef CONFIG_SMP
+	set	bitops_spinlock, %g5
+2:	ldstub	[%g5], %g7		! Spin on the byte lock for SMP.
+	orcc	%g7, 0x0, %g0		! Did we get it?
+	bne	2b			! Nope...
+#endif
+	 ld	[%g1], %g7
+	xor	%g7, %g2, %g5
+	and	%g7, %g2, %g2
+#ifdef CONFIG_SMP
+	st	%g5, [%g1]
+	set	bitops_spinlock, %g5
+	stb	%g0, [%g5]
+#else
+	st	%g5, [%g1]
+#endif
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+	jmpl	%o7, %g0
+	 mov	%g4, %o7
+
+	.globl  __bitops_end
+__bitops_end: