arch/arm/mach-spear/headsmp.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * arch/arm/mach-spear13XX/headsmp.S
   4  *
   5  * Picked from realview
   6  * Copyright (c) 2012 ST Microelectronics Limited
   7  * Shiraz Hashim <shiraz.linux.kernel@gmail.com>
   8  */
   9
  10 #include <linux/linkage.h>
  11 #include <linux/init.h>
  12
  13         __INIT
  14
  15 /*
  16  * spear13xx specific entry point for secondary CPUs. This provides
  17  * a "holding pen" into which all secondary cores are held until we're
  18  * ready for them to initialise.
  19  */
  20 ENTRY(spear13xx_secondary_startup)
  21         mrc     p15, 0, r0, c0, c0, 5
  22         and     r0, r0, #15
  23         adr     r4, 1f
  24         ldmia   r4, {r5, r6}
  25         sub     r4, r4, r5
  26         add     r6, r6, r4
  27 pen:    ldr     r7, [r6]
  28         cmp     r7, r0
  29         bne     pen
  30
  31         /* re-enable coherency */
  32         mrc     p15, 0, r0, c1, c0, 1
  33         orr     r0, r0, #(1 << 6) | (1 << 0)
  34         mcr     p15, 0, r0, c1, c0, 1
  35         /*
  36          * we've been released from the holding pen: secondary_stack
  37          * should now contain the SVC stack for this core
  38          */
  39         b       secondary_startup
  40
  41         .align
  42 1:      .long   .
  43         .long   spear_pen_release
  44 ENDPROC(spear13xx_secondary_startup)