| /* 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 |
