arch/arm/mach-exynos/headsmp.S

   1 /*
   2  *  linux/arch/arm/mach-exynos4/headsmp.S
   3  *
   4  *  Cloned from linux/arch/arm/mach-realview/headsmp.S
   5  *
   6  *  Copyright (c) 2003 ARM Limited
   7  *  All Rights Reserved
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/linkage.h>
  14 #include <linux/init.h>
  15
  16         __CPUINIT
  17
  18 /*
  19  * exynos4 specific entry point for secondary CPUs.  This provides
  20  * a "holding pen" into which all secondary cores are held until we're
  21  * ready for them to initialise.
  22  */
  23 ENTRY(exynos4_secondary_startup)
  24         mrc     p15, 0, r0, c0, c0, 5
  25         and     r0, r0, #15
  26         adr     r4, 1f
  27         ldmia   r4, {r5, r6}
  28         sub     r4, r4, r5
  29         add     r6, r6, r4
  30 pen:    ldr     r7, [r6]
  31         cmp     r7, r0
  32         bne     pen
  33
  34         /*
  35          * we've been released from the holding pen: secondary_stack
  36          * should now contain the SVC stack for this core
  37          */
  38         b       secondary_startup
  39 ENDPROC(exynos4_secondary_startup)
  40
  41         .align 2
  42 1:      .long   .
  43         .long   pen_release