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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/xtensa/kernel/mxhead.S
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/*

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 * Xtensa Secondary Processors startup code.

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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) 2001 - 2013 Tensilica Inc.

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 *

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 * Joe Taylor <[email protected]>

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 * Chris Zankel <[email protected]>

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 * Marc Gauthier <[email protected], [email protected]>

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 * Pete Delaney <[email protected]>

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 */

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#include <linux/linkage.h>

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#include <asm/cacheasm.h>

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#include <asm/initialize_mmu.h>

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#include <asm/mxregs.h>

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#include <asm/regs.h>

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	.section .SecondaryResetVector.text, "ax"

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ENTRY(_SecondaryResetVector)

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	_j _SetupOCD

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	.begin  no-absolute-literals

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	.literal_position

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_SetupOCD:

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	/*

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	 * Initialize WB, WS, and clear PS.EXCM (to allow loop instructions).

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	 * Set Interrupt Level just below XCHAL_DEBUGLEVEL to allow

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	 * xt-gdb to single step via DEBUG exceptions received directly

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	 * by ocd.

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	 */

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#if XCHAL_HAVE_WINDOWED

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	movi	a1, 1

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	movi	a0, 0

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	wsr	a1, windowstart

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	wsr	a0, windowbase

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	rsync

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#endif

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	movi	a1, LOCKLEVEL

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	wsr	a1, ps

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	rsync

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_SetupMMU:

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#ifdef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX

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	initialize_mmu

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#endif

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	/*

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	 * Start Secondary Processors with NULL pointer to boot params.

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	 */

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	movi	a2, 0				#  a2 == NULL

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	movi	a3, _startup

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	jx	a3

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	.end    no-absolute-literals

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