1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  linux/arch/arm/plat-versatile/headsmp.S
4 *
5 *  Copyright (c) 2003 ARM Limited
6 *  All Rights Reserved
7 */
8#include <linux/linkage.h>
9#include <linux/init.h>
10#include <asm/assembler.h>
11
12/*
13 * Realview/Versatile Express specific entry point for secondary CPUs.
14 * This provides a "holding pen" into which all secondary cores are held
15 * until we're ready for them to initialise.
16 */
17ENTRY(versatile_secondary_startup)
18 ARM_BE8(setend	be)
19	mrc	p15, 0, r0, c0, c0, 5
20	bic	r0, #0xff000000
21	adr	r4, 1f
22	ldmia	r4, {r5, r6}
23	sub	r4, r4, r5
24	add	r6, r6, r4
25pen:	ldr	r7, [r6]
26	cmp	r7, r0
27	bne	pen
28
29	/*
30	 * we've been released from the holding pen: secondary_stack
31	 * should now contain the SVC stack for this core
32	 */
33	b	secondary_startup
34
35	.align
361:	.long	.
37	.long	versatile_cpu_release
38ENDPROC(versatile_secondary_startup)
39