1/* 2 * arch/xtensa/boot/boot-elf/bootstrap.S 3 * 4 * Low-level exception handling 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file "COPYING" in the main directory of this archive 8 * for more details. 9 * 10 * Copyright (C) 2004 - 2013 by Tensilica Inc. 11 * 12 * Chris Zankel <chris@zankel.net> 13 * Marc Gauthier <marc@tensilica.com> 14 * Piet Delaney <piet@tensilica.com> 15 */ 16 17#include <asm/bootparam.h> 18#include <asm/initialize_mmu.h> 19#include <asm/vectors.h> 20#include <linux/linkage.h> 21 22 .section .ResetVector.text, "ax" 23 .global _ResetVector 24 .global reset 25 26_ResetVector: 27 _j _SetupMMU 28 29 .begin no-absolute-literals 30 .literal_position 31 32#ifdef CONFIG_PARSE_BOOTPARAM 33 .align 4 34_bootparam: 35 .short BP_TAG_FIRST 36 .short 4 37 .long BP_VERSION 38 .short BP_TAG_LAST 39 .short 0 40 .long 0 41#endif 42 43 .align 4 44_SetupMMU: 45 movi a0, 0 46 wsr a0, windowbase 47 rsync 48 movi a0, 1 49 wsr a0, windowstart 50 rsync 51 movi a0, 0x1F 52 wsr a0, ps 53 rsync 54 55#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 56 initialize_mmu 57#endif 58 59 rsil a0, XCHAL_DEBUGLEVEL-1 60 rsync 61reset: 62#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \ 63 XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY 64 movi a0, CONFIG_KERNEL_LOAD_ADDRESS 65#else 66 movi a0, KERNELOFFSET 67#endif 68#ifdef CONFIG_PARSE_BOOTPARAM 69 movi a2, _bootparam 70#else 71 movi a2, 0 72#endif 73 movi a3, 0 74 movi a4, 0 75 jx a0 76 77 .end no-absolute-literals 78