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1 /*
2  *  linux/arch/arm/plat-versatile/headsmp.S
3  *
4  *  Copyright (c) 2003 ARM Limited
5  *  All Rights Reserved
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #include <linux/linkage.h>
12 #include <linux/init.h>
13
14 /*
15  * Realview/Versatile Express specific entry point for secondary CPUs.
16  * This provides a "holding pen" into which all secondary cores are held
17  * until we're ready for them to initialise.
18  */
19 ENTRY(versatile_secondary_startup)
20         mrc     p15, 0, r0, c0, c0, 5
21         bic     r0, #0xff000000
22         adr     r4, 1f
23         ldmia   r4, {r5, r6}
24         sub     r4, r4, r5
25         add     r6, r6, r4
26 pen:    ldr     r7, [r6]
27         cmp     r7, r0
28         bne     pen
29
30         /*
31          * we've been released from the holding pen: secondary_stack
32          * should now contain the SVC stack for this core
33          */
34         b       secondary_startup
35
36         .align
37 1:      .long   .
38         .long   pen_release
39 ENDPROC(versatile_secondary_startup)