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-rw-r--r--kernel/arch/xtensa/boot/boot-elf/bootstrap.S102
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
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+/*
+ * 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