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