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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
*
* Copyright (C) IBM Corporation, 2012
*
* Author: Anton Blanchard <anton@au.ibm.com>
*/
#include <asm/ppc_asm.h>
#include <asm/vdso.h>
.text
/*
* Exact prototype of getcpu
*
* int __kernel_getcpu(unsigned *cpu, unsigned *node);
*
*/
#if defined(CONFIG_PPC64)
V_FUNCTION_BEGIN(__kernel_getcpu)
.cfi_startproc
mfspr r5,SPRN_SPRG_VDSO_READ
cmpwi cr0,r3,0
cmpwi cr1,r4,0
clrlwi r6,r5,16
rlwinm r7,r5,16,31-15,31-0
beq cr0,1f
stw r6,0(r3)
1: crclr cr0*4+so
li r3,0 /* always success */
beqlr cr1
stw r7,0(r4)
blr
.cfi_endproc
V_FUNCTION_END(__kernel_getcpu)
#elif !defined(CONFIG_SMP)
V_FUNCTION_BEGIN(__kernel_getcpu)
.cfi_startproc
cmpwi cr0, r3, 0
cmpwi cr1, r4, 0
li r5, 0
beq cr0, 1f
stw r5, 0(r3)
1: li r3, 0 /* always success */
crclr cr0*4+so
beqlr cr1
stw r5, 0(r4)
blr
.cfi_endproc
V_FUNCTION_END(__kernel_getcpu)
#endif
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