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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sparc/lib/bitops.S
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/* bitops.S: Sparc64 atomic bit operations.

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 *

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 * Copyright (C) 2000, 2007 David S. Miller ([email protected])

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 */

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#include <asm/asi.h>

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#include <asm/backoff.h>

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	.text

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	.globl	test_and_set_bit

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	.type	test_and_set_bit,#function

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test_and_set_bit:	/* %o0=nr, %o1=addr */

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	BACKOFF_SETUP(%o3)

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	srlx	%o0, 6, %g1

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	mov	1, %o2

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	sllx	%g1, 3, %g3

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	and	%o0, 63, %g2

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	sllx	%o2, %g2, %o2

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	add	%o1, %g3, %o1

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1:	ldx	[%o1], %g7

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	or	%g7, %o2, %g1

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	casx	[%o1], %g7, %g1

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	cmp	%g7, %g1

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	bne,pn	%xcc, BACKOFF_LABEL(2f, 1b)

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	 and	%g7, %o2, %g2

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	clr	%o0

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	movrne	%g2, 1, %o0

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	retl

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	 nop

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2:	BACKOFF_SPIN(%o3, %o4, 1b)

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	.size	test_and_set_bit, .-test_and_set_bit

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	.globl	test_and_clear_bit

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	.type	test_and_clear_bit,#function

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test_and_clear_bit:	/* %o0=nr, %o1=addr */

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	BACKOFF_SETUP(%o3)

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	srlx	%o0, 6, %g1

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	mov	1, %o2

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	sllx	%g1, 3, %g3

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	and	%o0, 63, %g2

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	sllx	%o2, %g2, %o2

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	add	%o1, %g3, %o1

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1:	ldx	[%o1], %g7

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	andn	%g7, %o2, %g1

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	casx	[%o1], %g7, %g1

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	cmp	%g7, %g1

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	bne,pn	%xcc, BACKOFF_LABEL(2f, 1b)

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	 and	%g7, %o2, %g2

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	clr	%o0

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	movrne	%g2, 1, %o0

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	retl

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	 nop

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2:	BACKOFF_SPIN(%o3, %o4, 1b)

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	.size	test_and_clear_bit, .-test_and_clear_bit

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	.globl	test_and_change_bit

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	.type	test_and_change_bit,#function

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test_and_change_bit:	/* %o0=nr, %o1=addr */

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	BACKOFF_SETUP(%o3)

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	srlx	%o0, 6, %g1

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	mov	1, %o2

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	sllx	%g1, 3, %g3

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	and	%o0, 63, %g2

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	sllx	%o2, %g2, %o2

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	add	%o1, %g3, %o1

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1:	ldx	[%o1], %g7

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	xor	%g7, %o2, %g1

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	casx	[%o1], %g7, %g1

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	cmp	%g7, %g1

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	bne,pn	%xcc, BACKOFF_LABEL(2f, 1b)

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	 and	%g7, %o2, %g2

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	clr	%o0

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	movrne	%g2, 1, %o0

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	retl

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	 nop

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2:	BACKOFF_SPIN(%o3, %o4, 1b)

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	.size	test_and_change_bit, .-test_and_change_bit

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	.globl	set_bit

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	.type	set_bit,#function

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set_bit:		/* %o0=nr, %o1=addr */

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	BACKOFF_SETUP(%o3)

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	srlx	%o0, 6, %g1

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	mov	1, %o2

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	sllx	%g1, 3, %g3

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	and	%o0, 63, %g2

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	sllx	%o2, %g2, %o2

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	add	%o1, %g3, %o1

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1:	ldx	[%o1], %g7

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	or	%g7, %o2, %g1

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	casx	[%o1], %g7, %g1

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	cmp	%g7, %g1

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	bne,pn	%xcc, BACKOFF_LABEL(2f, 1b)

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	 nop

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	retl

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	 nop

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2:	BACKOFF_SPIN(%o3, %o4, 1b)

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	.size	set_bit, .-set_bit

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	.globl	clear_bit

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	.type	clear_bit,#function

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clear_bit:		/* %o0=nr, %o1=addr */

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	BACKOFF_SETUP(%o3)

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	srlx	%o0, 6, %g1

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	mov	1, %o2

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	sllx	%g1, 3, %g3

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	and	%o0, 63, %g2

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	sllx	%o2, %g2, %o2

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	add	%o1, %g3, %o1

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1:	ldx	[%o1], %g7

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	andn	%g7, %o2, %g1

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	casx	[%o1], %g7, %g1

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	cmp	%g7, %g1

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	bne,pn	%xcc, BACKOFF_LABEL(2f, 1b)

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	 nop

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	retl

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	 nop

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2:	BACKOFF_SPIN(%o3, %o4, 1b)

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	.size	clear_bit, .-clear_bit

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	.globl	change_bit

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	.type	change_bit,#function

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change_bit:		/* %o0=nr, %o1=addr */

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	BACKOFF_SETUP(%o3)

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	srlx	%o0, 6, %g1

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	mov	1, %o2

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	sllx	%g1, 3, %g3

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	and	%o0, 63, %g2

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	sllx	%o2, %g2, %o2

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	add	%o1, %g3, %o1

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1:	ldx	[%o1], %g7

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	xor	%g7, %o2, %g1

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	casx	[%o1], %g7, %g1

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	cmp	%g7, %g1

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	bne,pn	%xcc, BACKOFF_LABEL(2f, 1b)

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	 nop

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	retl

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	 nop

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2:	BACKOFF_SPIN(%o3, %o4, 1b)

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	.size	change_bit, .-change_bit

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