arm/mach-socfpga/headsmp.S

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  *  Copyright (c) 2003 ARM Limited
0004  *  Copyright (c) u-boot contributors
0005  *  Copyright (c) 2012 Pavel Machek <pavel@denx.de>
0006  */
0007 #include <linux/linkage.h>
0008 #include <linux/init.h>
0009 #include <asm/memory.h>
0010 #include <asm/assembler.h>
0011
0012     .arch   armv7-a
0013     .arm
0014
0015 ENTRY(secondary_trampoline)
0016     /* CPU1 will always fetch from 0x0 when it is brought out of reset.
0017      * Thus, we can just subtract the PAGE_OFFSET to get the physical
0018      * address of &cpu1start_addr. This would not work for platforms
0019      * where the physical memory does not start at 0x0.
0020     */
0021 ARM_BE8(setend  be)
0022     adr r0, 1f
0023     ldmia   r0, {r1, r2}
0024     sub r2, r2, #PAGE_OFFSET
0025     ldr r3, [r2]
0026     ldr r4, [r3]
0027 ARM_BE8(rev r4, r4)
0028     bx  r4
0029
0030     .align
0031 1:  .long   .
0032     .long   socfpga_cpu1start_addr
0033 ENTRY(secondary_trampoline_end)