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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/xtensa/boot/boot-elf/bootstrap.S
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/*

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 * arch/xtensa/boot/boot-elf/bootstrap.S

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 *

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 * Low-level exception handling

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 *

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 2004 - 2013 by Tensilica Inc.

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 *

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 * Chris Zankel <[email protected]>

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 * Marc Gauthier <[email protected]>

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 * Piet Delaney <[email protected]>

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 */

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#include <asm/bootparam.h>

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#include <asm/initialize_mmu.h>

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#include <asm/vectors.h>

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#include <linux/linkage.h>

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	.section	.ResetVector.text, "ax"

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	.global         _ResetVector

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	.global         reset

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_ResetVector:

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	_j _SetupMMU

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	.begin  no-absolute-literals

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	.literal_position

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#ifdef CONFIG_PARSE_BOOTPARAM

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	.align 4

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_bootparam:

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	.short	BP_TAG_FIRST

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	.short	4

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	.long	BP_VERSION

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	.short	BP_TAG_LAST

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	.short	0

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	.long	0

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#endif

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	.align  4

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_SetupMMU:

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#if XCHAL_HAVE_WINDOWED

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	movi	a0, 0

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	wsr	a0, windowbase

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	rsync

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	movi	a0, 1

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	wsr	a0, windowstart

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	rsync

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#endif

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	movi	a0, 0x1F

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	wsr	a0, ps

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	rsync

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#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX

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	initialize_mmu

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#endif

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	rsil    a0, XCHAL_DEBUGLEVEL-1

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	rsync

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reset:

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#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \

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	XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY

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	movi	a0, CONFIG_KERNEL_LOAD_ADDRESS

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#else

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	movi	a0, KERNELOFFSET

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#endif

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#ifdef CONFIG_PARSE_BOOTPARAM

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	movi	a2, _bootparam

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#else

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	movi	a2, 0

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#endif

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	movi	a3, 0

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	movi	a4, 0

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	jx      a0

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	.end    no-absolute-literals

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