arch/arm/mach-socfpga/headsmp.S

   1 /*
   2  *  Copyright (c) 2003 ARM Limited
   3  *  Copyright (c) u-boot contributors
   4  *  Copyright (c) 2012 Pavel Machek <pavel@denx.de>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/linkage.h>
  11 #include <linux/init.h>
  12 #include <asm/memory.h>
  13 #include <asm/assembler.h>
  14
  15         .arch   armv7-a
  16         .arm
  17
  18 ENTRY(secondary_trampoline)
  19         /* CPU1 will always fetch from 0x0 when it is brought out of reset.
  20          * Thus, we can just subtract the PAGE_OFFSET to get the physical
  21          * address of &cpu1start_addr. This would not work for platforms
  22          * where the physical memory does not start at 0x0.
  23         */
  24 ARM_BE8(setend  be)
  25         adr     r0, 1f
  26         ldmia   r0, {r1, r2}
  27         sub     r2, r2, #PAGE_OFFSET
  28         ldr     r3, [r2]
  29         ldr     r4, [r3]
  30 ARM_BE8(rev     r4, r4)
  31         bx      r4
  32
  33         .align
  34 1:      .long   .
  35         .long   socfpga_cpu1start_addr
  36 ENTRY(secondary_trampoline_end)