summaryrefslogtreecommitdiff
path: root/arch/xtensa/boot/boot-elf
diff options
context:
space:
mode:
Diffstat (limited to 'arch/xtensa/boot/boot-elf')
-rw-r--r--arch/xtensa/boot/boot-elf/.gitignore1
-rw-r--r--arch/xtensa/boot/boot-elf/Makefile34
-rw-r--r--arch/xtensa/boot/boot-elf/boot.lds.S56
-rw-r--r--arch/xtensa/boot/boot-elf/bootstrap.S102
4 files changed, 193 insertions, 0 deletions
diff --git a/arch/xtensa/boot/boot-elf/.gitignore b/arch/xtensa/boot/boot-elf/.gitignore
new file mode 100644
index 000000000..5ff8fbb85
--- /dev/null
+++ b/arch/xtensa/boot/boot-elf/.gitignore
@@ -0,0 +1 @@
+boot.lds
diff --git a/arch/xtensa/boot/boot-elf/Makefile b/arch/xtensa/boot/boot-elf/Makefile
new file mode 100644
index 000000000..89db089f5
--- /dev/null
+++ b/arch/xtensa/boot/boot-elf/Makefile
@@ -0,0 +1,34 @@
+#
+# 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.
+#
+
+ifeq ($(BIG_ENDIAN),1)
+OBJCOPY_ARGS := -O elf32-xtensa-be
+else
+OBJCOPY_ARGS := -O elf32-xtensa-le
+endif
+
+export OBJCOPY_ARGS
+export CPPFLAGS_boot.lds += -P -C
+export KBUILD_AFLAGS += -mtext-section-literals
+
+boot-y := bootstrap.o
+
+OBJS := $(addprefix $(obj)/,$(boot-y))
+
+$(obj)/Image.o: vmlinux.bin $(OBJS)
+ $(Q)$(OBJCOPY) $(OBJCOPY_ARGS) -R .comment \
+ --add-section image=vmlinux.bin \
+ --set-section-flags image=contents,alloc,load,load,data \
+ $(OBJS) $@
+
+$(obj)/../Image.elf: $(obj)/Image.o $(obj)/boot.lds
+ $(Q)$(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) \
+ -T $(obj)/boot.lds \
+ --build-id=none \
+ -o $@ $(obj)/Image.o
+ $(Q)$(kecho) ' Kernel: $@ is ready'
+
+zImage: $(obj)/../Image.elf
diff --git a/arch/xtensa/boot/boot-elf/boot.lds.S b/arch/xtensa/boot/boot-elf/boot.lds.S
new file mode 100644
index 000000000..958b33af9
--- /dev/null
+++ b/arch/xtensa/boot/boot-elf/boot.lds.S
@@ -0,0 +1,56 @@
+/*
+ * linux/arch/xtensa/boot/boot-elf/boot.lds.S
+ *
+ * Copyright (C) 2008 - 2013 by Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Marc Gauthier <marc@tensilica.com
+ * Pete Delaney <piet@tensilica.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <asm/vectors.h>
+OUTPUT_ARCH(xtensa)
+ENTRY(_ResetVector)
+
+SECTIONS
+{
+ .ResetVector.text XCHAL_RESET_VECTOR_VADDR :
+ {
+ *(.ResetVector.text)
+ }
+
+ .image KERNELOFFSET: AT (LOAD_MEMORY_ADDRESS)
+ {
+ _image_start = .;
+ *(image)
+ . = (. + 3) & ~ 3;
+ _image_end = . ;
+ }
+
+ .bss ((LOADADDR(.image) + SIZEOF(.image) + 3) & ~ 3):
+ {
+ __bss_start = .;
+ *(.sbss)
+ *(.scommon)
+ *(.dynbss)
+ *(.bss)
+ __bss_end = .;
+ }
+
+#ifdef CONFIG_MMU
+ /*
+ * This is a remapped copy of the Reset Vector Code.
+ * It keeps gdb in sync with the PC after switching
+ * to the temporary mapping used while setting up
+ * the V2 MMU mappings for Linux.
+ */
+ .ResetVector.remapped_text 0x46000000 (INFO):
+ {
+ *(.ResetVector.remapped_text)
+ }
+#endif
+}
diff --git a/arch/xtensa/boot/boot-elf/bootstrap.S b/arch/xtensa/boot/boot-elf/bootstrap.S
new file mode 100644
index 000000000..9341a5750
--- /dev/null
+++ b/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