original development tree for Linux kernel GTP module; now long in mainline.
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linux-gtp/arch/arm/mach-spear13xx/headsmp.S

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/*
* arch/arm/mach-spear13XX/headsmp.S
*
* Picked from realview
* Copyright (c) 2012 ST Microelectronics Limited
* Shiraz Hashim <shiraz.hashim@st.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/linkage.h>
#include <linux/init.h>
__INIT
/*
* spear13xx specific entry point for secondary CPUs. This provides
* a "holding pen" into which all secondary cores are held until we're
* ready for them to initialise.
*/
ENTRY(spear13xx_secondary_startup)
mrc p15, 0, r0, c0, c0, 5
and r0, r0, #15
adr r4, 1f
ldmia r4, {r5, r6}
sub r4, r4, r5
add r6, r6, r4
pen: ldr r7, [r6]
cmp r7, r0
bne pen
/* re-enable coherency */
mrc p15, 0, r0, c1, c0, 1
orr r0, r0, #(1 << 6) | (1 << 0)
mcr p15, 0, r0, c1, c0, 1
/*
* we've been released from the holding pen: secondary_stack
* should now contain the SVC stack for this core
*/
b secondary_startup
.align
1: .long .
.long pen_release
ENDPROC(spear13xx_secondary_startup)