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/processor.h> 19#include <asm/pgtable.h> 20#include <asm/page.h> 21#include <asm/cacheasm.h> 22#include <asm/initialize_mmu.h> 23#include <asm/vectors.h> 24#include <linux/linkage.h> 25 26 .section .ResetVector.text, "ax" 27 .global _ResetVector 28 .global reset 29 30_ResetVector: 31 _j _SetupMMU 32 33 .begin no-absolute-literals 34 .literal_position 35 36 .align 4 37RomInitAddr: 38#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \ 39 XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY 40 .word CONFIG_KERNEL_LOAD_ADDRESS 41#else 42 .word KERNELOFFSET 43#endif 44RomBootParam: 45 .word _bootparam 46_bootparam: 47 .short BP_TAG_FIRST 48 .short 4 49 .long BP_VERSION 50 .short BP_TAG_LAST 51 .short 0 52 .long 0 53 54 .align 4 55_SetupMMU: 56 movi a0, 0 57 wsr a0, windowbase 58 rsync 59 movi a0, 1 60 wsr a0, windowstart 61 rsync 62 movi a0, 0x1F 63 wsr a0, ps 64 rsync 65 66#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX 67 initialize_mmu 68#endif 69 70 .end no-absolute-literals 71 72 rsil a0, XCHAL_DEBUGLEVEL-1 73 rsync 74reset: 75 l32r a0, RomInitAddr 76 l32r a2, RomBootParam 77 movi a3, 0 78 movi a4, 0 79 jx a0 80