1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * arch/arm/mach-spear13XX/headsmp.S
4 *
5 * Picked from realview
6 * Copyright (c) 2012 ST Microelectronics Limited
7 * Shiraz Hashim <shiraz.linux.kernel@gmail.com>
8 */
9
10 #include <linux/linkage.h>
11 #include <linux/init.h>
12
13 __INIT
14
15 /*
16 * spear13xx specific entry point for secondary CPUs. This provides
17 * a "holding pen" into which all secondary cores are held until we're
18 * ready for them to initialise.
19 */
20 ENTRY(spear13xx_secondary_startup)
21 mrc p15, 0, r0, c0, c0, 5
22 and r0, r0, #15
23 adr r4, 1f
24 ldmia r4, {r5, r6}
25 sub r4, r4, r5
26 add r6, r6, r4
27 pen: ldr r7, [r6]
28 cmp r7, r0
29 bne pen
30
31 /* re-enable coherency */
32 mrc p15, 0, r0, c1, c0, 1
33 orr r0, r0, #(1 << 6) | (1 << 0)
34 mcr p15, 0, r0, c1, c0, 1
35 /*
36 * we've been released from the holding pen: secondary_stack
37 * should now contain the SVC stack for this core
38 */
39 b secondary_startup
40
41 .align
42 1: .long .
43 .long spear_pen_release
44 ENDPROC(spear13xx_secondary_startup)