arch/arm/mach-vexpress/headsmp.S

   1 /*
   2  *  linux/arch/arm/mach-vexpress/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         __INIT
  15
  16 /*
  17  * Versatile Express specific entry point for secondary CPUs.  This
  18  * provides a "holding pen" into which all secondary cores are held
  19  * until we're ready for them to initialise.
  20  */
  21 ENTRY(vexpress_secondary_startup)
  22         mrc     p15, 0, r0, c0, c0, 5
  23         and     r0, r0, #15
  24         adr     r4, 1f
  25         ldmia   r4, {r5, r6}
  26         sub     r4, r4, r5
  27         add     r6, r6, r4
  28 pen:    ldr     r7, [r6]
  29         cmp     r7, r0
  30         bne     pen
  31
  32         /*
  33          * we've been released from the holding pen: secondary_stack
  34          * should now contain the SVC stack for this core
  35          */
  36         b       secondary_startup
  37
  38         .align
  39 1:      .long   .
  40         .long   pen_release