arm/mach-exynos/headsmp.S

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  *  Cloned from linux/arch/arm/mach-realview/headsmp.S
0004  *
0005  *  Copyright (c) 2003 ARM Limited
0006  *  All Rights Reserved
0007  */
0008 #include <linux/linkage.h>
0009 #include <linux/init.h>
0010
0011 #include <asm/assembler.h>
0012
0013 /*
0014  * exynos4 specific entry point for secondary CPUs.  This provides
0015  * a "holding pen" into which all secondary cores are held until we're
0016  * ready for them to initialise.
0017  */
0018 ENTRY(exynos4_secondary_startup)
0019 ARM_BE8(setend  be)
0020     mrc p15, 0, r0, c0, c0, 5
0021     and r0, r0, #15
0022     adr r4, 1f
0023     ldmia   r4, {r5, r6}
0024     sub r4, r4, r5
0025     add r6, r6, r4
0026 pen:    ldr r7, [r6]
0027     cmp r7, r0
0028     bne pen
0029
0030     /*
0031      * we've been released from the holding pen: secondary_stack
0032      * should now contain the SVC stack for this core
0033      */
0034     b   secondary_startup
0035 ENDPROC(exynos4_secondary_startup)
0036
0037     .align 2
0038 1:  .long   .
0039     .long   exynos_pen_release