diff options
Diffstat (limited to 'arch/xtensa/boot/boot-elf/bootstrap.S')
| -rw-r--r-- | arch/xtensa/boot/boot-elf/bootstrap.S | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/arch/xtensa/boot/boot-elf/bootstrap.S b/arch/xtensa/boot/boot-elf/bootstrap.S new file mode 100644 index 000000000..29c68426a --- /dev/null +++ b/arch/xtensa/boot/boot-elf/bootstrap.S @@ -0,0 +1,78 @@ +/* + * 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/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 + +#if defined(CONFIG_INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX) && \ + XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY + .literal RomInitAddr, CONFIG_KERNEL_LOAD_ADDRESS +#else + .literal RomInitAddr, KERNELOFFSET +#endif +#ifndef CONFIG_PARSE_BOOTPARAM + .literal RomBootParam, 0 +#else + .literal RomBootParam, _bootparam + + .align 4 +_bootparam: + .short BP_TAG_FIRST + .short 4 + .long BP_VERSION + .short BP_TAG_LAST + .short 0 + .long 0 +#endif + + .align 4 +_SetupMMU: + movi a0, 0 + wsr a0, windowbase + rsync + movi a0, 1 + wsr a0, windowstart + rsync + movi a0, 0x1F + wsr a0, ps + rsync + +#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 |