diff options
Diffstat (limited to 'kernel/arch/xtensa/boot/boot-elf/bootstrap.S')
| -rw-r--r-- | kernel/arch/xtensa/boot/boot-elf/bootstrap.S | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/kernel/arch/xtensa/boot/boot-elf/bootstrap.S b/kernel/arch/xtensa/boot/boot-elf/bootstrap.S new file mode 100644 index 000000000..9341a5750 --- /dev/null +++ b/kernel/arch/xtensa/boot/boot-elf/bootstrap.S @@ -0,0 +1,102 @@ +/* + * arch/xtensa/boot/boot-elf/bootstrap.S + * + * Low-level exception handling + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2004 - 2013 by Tensilica Inc. + * + * Chris Zankel <chris@zankel.net> + * Marc Gauthier <marc@tensilica.com> + * Piet Delaney <piet@tensilica.com> + */ + +#include <asm/bootparam.h> +#include <asm/processor.h> +#include <asm/pgtable.h> +#include <asm/page.h> +#include <asm/cacheasm.h> +#include <asm/initialize_mmu.h> +#include <asm/vectors.h> +#include <linux/linkage.h> + + .section .ResetVector.text, "ax" + .global _ResetVector + .global reset + +_ResetVector: + _j _SetupMMU + + .begin no-absolute-literals + .literal_position + + .align 4 +RomInitAddr: + .word LOAD_MEMORY_ADDRESS +RomBootParam: + .word _bootparam +_bootparam: + .short BP_TAG_FIRST + .short 4 + .long BP_VERSION + .short BP_TAG_LAST + .short 0 + .long 0 + + .align 4 +_SetupMMU: + movi a0, 0 + wsr a0, windowbase + rsync + movi a0, 1 + wsr a0, windowstart + rsync + movi a0, 0x1F + wsr a0, ps + rsync + + Offset = _SetupMMU - _ResetVector + +#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX + initialize_mmu +#endif + + .end no-absolute-literals + + rsil a0, XCHAL_DEBUGLEVEL-1 + rsync +reset: + l32r a0, RomInitAddr + l32r a2, RomBootParam + movi a3, 0 + movi a4, 0 + jx a0 + +#ifdef CONFIG_MMU + .align 4 + + .section .ResetVector.remapped_text, "x" + .global _RemappedResetVector + + /* Do org before literals */ + .org 0 + +_RemappedResetVector: + .begin no-absolute-literals + .literal_position + + _j _RemappedSetupMMU + + /* Position Remapped code at the same location as the original code */ + . = _RemappedResetVector + Offset + +_RemappedSetupMMU: +#ifndef CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX + initialize_mmu +#endif + + .end no-absolute-literals +#endif |