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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/kernel/helpers.S
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/* SPDX-License-Identifier: GPL-2.0-only */

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	.align	32

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	.globl	__flushw_user

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	.type	__flushw_user,#function

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__flushw_user:

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	rdpr	%otherwin, %g1

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	brz,pn	%g1, 2f

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	 clr	%g2

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1:	save	%sp, -128, %sp

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	rdpr	%otherwin, %g1

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	brnz,pt	%g1, 1b

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	 add	%g2, 1, %g2

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1:	sub	%g2, 1, %g2

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	brnz,pt	%g2, 1b

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	 restore %g0, %g0, %g0

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2:	retl

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	 nop

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	.size	__flushw_user,.-__flushw_user

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EXPORT_SYMBOL(__flushw_user)

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	/* Flush %fp and %i7 to the stack for all register

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	 * windows active inside of the cpu.  This allows

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	 * show_stack_trace() to avoid using an expensive

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	 * 'flushw'.

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	 */

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	.globl		stack_trace_flush

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	.type		stack_trace_flush,#function

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stack_trace_flush:

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	rdpr		%pstate, %o0

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	wrpr		%o0, PSTATE_IE, %pstate

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	rdpr		%cwp, %g1

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	rdpr		%canrestore, %g2

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	sub		%g1, 1, %g3

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1:	brz,pn		%g2, 2f

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	 sub		%g2, 1, %g2

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	wrpr		%g3, %cwp

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	stx		%fp, [%sp + STACK_BIAS + RW_V9_I6]

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	stx		%i7, [%sp + STACK_BIAS + RW_V9_I7]

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	ba,pt		%xcc, 1b

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	 sub		%g3, 1, %g3

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2:	wrpr		%g1, %cwp

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	wrpr		%o0, %pstate

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	retl

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	 nop

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	.size		stack_trace_flush,.-stack_trace_flush

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#ifdef CONFIG_SMP

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	.globl		hard_smp_processor_id

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	.type		hard_smp_processor_id,#function

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hard_smp_processor_id:

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#endif

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	.globl		real_hard_smp_processor_id

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	.type		real_hard_smp_processor_id,#function

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real_hard_smp_processor_id:

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	__GET_CPUID(%o0)

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	retl

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	 nop

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#ifdef CONFIG_SMP

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	.size		hard_smp_processor_id,.-hard_smp_processor_id

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#endif

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	.size		real_hard_smp_processor_id,.-real_hard_smp_processor_id

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EXPORT_SYMBOL_GPL(real_hard_smp_processor_id)

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