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 */
17 ENTRY(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
25 pen: 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
36 1: .long .
37 .long versatile_cpu_release
38 ENDPROC(versatile_secondary_startup)