1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *
4 * Copyright (C) IBM Corporation, 2012
5 *
6 * Author: Anton Blanchard <anton@au.ibm.com>
7 */
8#include <asm/ppc_asm.h>
9#include <asm/vdso.h>
10
11	.text
12/*
13 * Exact prototype of getcpu
14 *
15 * int __kernel_getcpu(unsigned *cpu, unsigned *node);
16 *
17 */
18#if defined(CONFIG_PPC64)
19V_FUNCTION_BEGIN(__kernel_getcpu)
20  .cfi_startproc
21	mfspr	r5,SPRN_SPRG_VDSO_READ
22	cmpwi	cr0,r3,0
23	cmpwi	cr1,r4,0
24	clrlwi  r6,r5,16
25	rlwinm  r7,r5,16,31-15,31-0
26	beq	cr0,1f
27	stw	r6,0(r3)
281:	crclr	cr0*4+so
29	li	r3,0			/* always success */
30	beqlr	cr1
31	stw	r7,0(r4)
32	blr
33  .cfi_endproc
34V_FUNCTION_END(__kernel_getcpu)
35#elif !defined(CONFIG_SMP)
36V_FUNCTION_BEGIN(__kernel_getcpu)
37  .cfi_startproc
38	cmpwi	cr0, r3, 0
39	cmpwi	cr1, r4, 0
40	li	r5, 0
41	beq	cr0, 1f
42	stw	r5, 0(r3)
431:	li	r3, 0			/* always success */
44	crclr	cr0*4+so
45	beqlr	cr1
46	stw	r5, 0(r4)
47	blr
48  .cfi_endproc
49V_FUNCTION_END(__kernel_getcpu)
50#endif
51