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