diff options
Diffstat (limited to 'arch/powerpc/kernel/vdso/getcpu.S')
| -rw-r--r-- | arch/powerpc/kernel/vdso/getcpu.S | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/vdso/getcpu.S b/arch/powerpc/kernel/vdso/getcpu.S new file mode 100644 index 000000000..8e08ccf19 --- /dev/null +++ b/arch/powerpc/kernel/vdso/getcpu.S @@ -0,0 +1,50 @@ +/* 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 + PPC_LCMPI cr0,r3,0 + PPC_LCMPI 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 |