2024-09-09 08:57:42 +00:00
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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 <chris@zankel.net>
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* Marc Gauthier <marc@tensilica.com>
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* Piet Delaney <piet@tensilica.com>
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*/
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2024-09-09 08:52:07 +00:00
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#include <asm/bootparam.h>
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#include <asm/processor.h>
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#include <asm/pgtable.h>
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#include <asm/page.h>
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#include <asm/cacheasm.h>
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#include <asm/initialize_mmu.h>
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#include <linux/linkage.h>
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2024-09-09 08:57:42 +00:00
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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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.align 4
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RomInitAddr:
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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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.word 0x00003000
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#else
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.word 0xd0003000
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#endif
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RomBootParam:
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.word _bootparam
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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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.align 4
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_SetupMMU:
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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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movi a0, 0x1F
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wsr a0, ps
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rsync
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Offset = _SetupMMU - _ResetVector
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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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.end no-absolute-literals
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rsil a0, XCHAL_DEBUGLEVEL-1
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rsync
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reset:
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l32r a0, RomInitAddr
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l32r a2, RomBootParam
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movi a3, 0
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movi a4, 0
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jx a0
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.align 4
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.section .ResetVector.remapped_text, "x"
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.global _RemappedResetVector
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/* Do org before literals */
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.org 0
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_RemappedResetVector:
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.begin no-absolute-literals
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.literal_position
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_j _RemappedSetupMMU
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/* Position Remapped code at the same location as the original code */
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. = _RemappedResetVector + Offset
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_RemappedSetupMMU:
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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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.end no-absolute-literals
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