arch/arm/mach-spear/headsmp.S

   1 /*
   2  * arch/arm/mach-spear13XX/headsmp.S
   3  *
   4  * Picked from realview
   5  * Copyright (c) 2012 ST Microelectronics Limited
   6  * Shiraz Hashim <shiraz.linux.kernel@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/linkage.h>
  14 #include <linux/init.h>
  15
  16         __INIT
  17
  18 /*
  19  * spear13xx 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(spear13xx_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         /* re-enable coherency */
  35         mrc     p15, 0, r0, c1, c0, 1
  36         orr     r0, r0, #(1 << 6) | (1 << 0)
  37         mcr     p15, 0, r0, c1, c0, 1
  38         /*
  39          * we've been released from the holding pen: secondary_stack
  40          * should now contain the SVC stack for this core
  41          */
  42         b       secondary_startup
  43
  44         .align
  45 1:      .long   .
  46         .long   pen_release
  47 ENDPROC(spear13xx_secondary_startup)