1/* 2 * Secondary CPU startup routine source file. 3 * 4 * Copyright (C) 2009 Texas Instruments, Inc. 5 * 6 * Author: 7 * Santosh Shilimkar <santosh.shilimkar@ti.com> 8 * 9 * Interface functions needed for the SMP. This file is based on arm 10 * realview smp platform. 11 * Copyright (c) 2003 ARM Limited. 12 * 13 * This program is free software,you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License version 2 as 15 * published by the Free Software Foundation. 16 */ 17 18#include <linux/linkage.h> 19#include <linux/init.h> 20 21/* Physical address needed since MMU not enabled yet on secondary core */ 22#define OMAP4_AUX_CORE_BOOT1_PA 0x48281804 23 24 __INIT 25 26/* 27 * OMAP4 specific entry point for secondary CPU to jump from ROM 28 * code. This routine also provides a holding flag into which 29 * secondary core is held until we're ready for it to initialise. 30 * The primary core will update this flag using a hardware 31 * register AuxCoreBoot0. 32 */ 33ENTRY(omap_secondary_startup) 34hold: ldr r12,=0x103 35 dsb 36 smc #0 @ read from AuxCoreBoot0 37 mov r0, r0, lsr #9 38 mrc p15, 0, r4, c0, c0, 5 39 and r4, r4, #0x0f 40 cmp r0, r4 41 bne hold 42 43 /* 44 * we've been released from the wait loop,secondary_stack 45 * should now contain the SVC stack for this core 46 */ 47 b secondary_startup 48END(omap_secondary_startup) 49