patch-2.1.23 linux/arch/sparc/lib/bitops.S

• Lines: 127
• Date: Sun Jan 26 12:07:09 1997
• Orig file: v2.1.22/linux/arch/sparc/lib/bitops.S
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.1.22/linux/arch/sparc/lib/bitops.S linux/arch/sparc/lib/bitops.S
@@ -0,0 +1,126 @@
+/* bitops.S: Low level assembler bit operations.
+ *
+ * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/cprefix.h>
+#include <asm/ptrace.h>
+#include <asm/psr.h>
+
+	.text
+	.align	4
+
+	/* 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
+	andcc	%g3, PSR_PIL, %g0
+	bne	1f
+	 nop
+	wr	%g3, PSR_PIL, %psr
+	nop; nop; nop
+1:
+	ld	[%g1], %g7
+	or	%g7, %g2, %g5
+	andcc	%g3, PSR_PIL, %g0
+	and	%g7, %g2, %g2
+	bne	1f
+	 st	%g5, [%g1]
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+1:
+	jmpl	%o7, %g0
+	 mov	%g4, %o7
+
+	/* Same as above, but clears the bits from %g2 instead. */
+	.globl	___clear_bit
+___clear_bit:
+	rd	%psr, %g3
+	andcc	%g3, PSR_PIL, %g0
+	bne	1f
+	 nop
+	wr	%g3, PSR_PIL, %psr
+	nop; nop; nop
+1:
+	ld	[%g1], %g7
+	andn	%g7, %g2, %g5
+	andcc	%g3, PSR_PIL, %g0
+	and	%g7, %g2, %g2
+	bne	1f
+	 st	%g5, [%g1]
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+1:
+	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
+	andcc	%g3, PSR_PIL, %g0
+	bne	1f
+	 nop
+	wr	%g3, PSR_PIL, %psr
+	nop; nop; nop
+1:
+	ld	[%g1], %g7
+	xor	%g7, %g2, %g5
+	andcc	%g3, PSR_PIL, %g0
+	and	%g7, %g2, %g2
+	bne	1f
+	 st	%g5, [%g1]
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+1:
+	jmpl	%o7, %g0
+	 mov	%g4, %o7
+
+	/* Now the little endian versions. */
+	.globl	___set_le_bit
+___set_le_bit:
+	rd	%psr, %g3
+	andcc	%g3, PSR_PIL, %g0
+	bne	1f
+	 nop
+	wr	%g3, PSR_PIL, %psr
+	nop; nop; nop
+1:
+	ldub	[%g1], %g7
+	or	%g7, %g2, %g5
+	andcc	%g3, PSR_PIL, %g0
+	and	%g7, %g2, %g2
+	bne	1f
+	 stb	%g5, [%g1]
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+1:
+	jmpl	%o7, %g0
+	 mov	%g4, %o7
+
+	.globl	___clear_le_bit
+___clear_le_bit:
+	rd	%psr, %g3
+	andcc	%g3, PSR_PIL, %g0
+	bne	1f
+	 nop
+	wr	%g3, PSR_PIL, %psr
+	nop; nop; nop
+1:
+	ldub	[%g1], %g7
+	andn	%g7, %g2, %g5
+	andcc	%g3, PSR_PIL, %g0
+	and	%g7, %g2, %g2
+	bne	1f
+	 stb	%g5, [%g1]
+	wr	%g3, 0x0, %psr
+	nop; nop; nop
+1:
+	jmpl	%o7, %g0
+	 mov	%g4, %o7