arch/arm/mach-exynos/headsmp.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  *  Cloned from linux/arch/arm/mach-realview/headsmp.S
   4  *
   5  *  Copyright (c) 2003 ARM Limited
   6  *  All Rights Reserved
   7  */
   8 #include <linux/linkage.h>
   9 #include <linux/init.h>
  10
  11 #include <asm/assembler.h>
  12
  13 /*
  14  * exynos4 specific entry point for secondary CPUs.  This provides
  15  * a "holding pen" into which all secondary cores are held until we're
  16  * ready for them to initialise.
  17  */
  18 ENTRY(exynos4_secondary_startup)
  19 ARM_BE8(setend  be)
  20         mrc     p15, 0, r0, c0, c0, 5
  21         and     r0, r0, #15
  22         adr     r4, 1f
  23         ldmia   r4, {r5, r6}
  24         sub     r4, r4, r5
  25         add     r6, r6, r4
  26 pen:    ldr     r7, [r6]
  27         cmp     r7, r0
  28         bne     pen
  29
  30         /*
  31          * we've been released from the holding pen: secondary_stack
  32          * should now contain the SVC stack for this core
  33          */
  34         b       secondary_startup
  35 ENDPROC(exynos4_secondary_startup)
  36
  37         .align 2
  38 1:      .long   .
  39         .long   exynos_pen_release