arch/arm/mach-socfpga/headsmp.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  Copyright (c) 2003 ARM Limited
   4  *  Copyright (c) u-boot contributors
   5  *  Copyright (c) 2012 Pavel Machek <pavel@denx.de>
   6  */
   7 #include <linux/linkage.h>
   8 #include <linux/init.h>
   9 #include <asm/memory.h>
  10 #include <asm/assembler.h>
  11
  12         .arch   armv7-a
  13         .arm
  14
  15 ENTRY(secondary_trampoline)
  16         /* CPU1 will always fetch from 0x0 when it is brought out of reset.
  17          * Thus, we can just subtract the PAGE_OFFSET to get the physical
  18          * address of &cpu1start_addr. This would not work for platforms
  19          * where the physical memory does not start at 0x0.
  20         */
  21 ARM_BE8(setend  be)
  22         adr     r0, 1f
  23         ldmia   r0, {r1, r2}
  24         sub     r2, r2, #PAGE_OFFSET
  25         ldr     r3, [r2]
  26         ldr     r4, [r3]
  27 ARM_BE8(rev     r4, r4)
  28         bx      r4
  29
  30         .align
  31 1:      .long   .
  32         .long   socfpga_cpu1start_addr
  33 ENTRY(secondary_trampoline_end)