81a0bc39ea
This patch adds EFI stub support for the ARM Linux kernel. The EFI stub operates similarly to the x86 and arm64 stubs: it is a shim between the EFI firmware and the normal zImage entry point, and sets up the environment that the zImage is expecting. This includes optionally loading the initrd and device tree from the system partition based on the kernel command line. Signed-off-by: Roy Franz <roy.franz@linaro.org> Tested-by: Ryan Harkin <ryan.harkin@linaro.org> Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
95 lines
2.1 KiB
ArmAsm
95 lines
2.1 KiB
ArmAsm
/*
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* Copyright (C) 2000 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifdef CONFIG_CPU_ENDIAN_BE8
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#define ZIMAGE_MAGIC(x) ( (((x) >> 24) & 0x000000ff) | \
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(((x) >> 8) & 0x0000ff00) | \
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(((x) << 8) & 0x00ff0000) | \
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(((x) << 24) & 0xff000000) )
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#else
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#define ZIMAGE_MAGIC(x) (x)
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#endif
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OUTPUT_ARCH(arm)
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ENTRY(_start)
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SECTIONS
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{
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/DISCARD/ : {
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*(.ARM.exidx*)
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*(.ARM.extab*)
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/*
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* Discard any r/w data - this produces a link error if we have any,
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* which is required for PIC decompression. Local data generates
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* GOTOFF relocations, which prevents it being relocated independently
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* of the text/got segments.
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*/
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*(.data)
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}
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. = TEXT_START;
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_text = .;
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.text : {
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_start = .;
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*(.start)
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*(.text)
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*(.text.*)
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*(.fixup)
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*(.gnu.warning)
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*(.glue_7t)
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*(.glue_7)
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}
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.rodata : {
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*(.rodata)
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*(.rodata.*)
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}
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.data : {
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/*
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* The EFI stub always executes from RAM, and runs strictly before the
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* decompressor, so we can make an exception for its r/w data, and keep it
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*/
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*(.data.efistub)
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}
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.piggydata : {
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*(.piggydata)
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}
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. = ALIGN(4);
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_etext = .;
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.got.plt : { *(.got.plt) }
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_got_start = .;
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.got : { *(.got) }
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_got_end = .;
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/* ensure the zImage file size is always a multiple of 64 bits */
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/* (without a dummy byte, ld just ignores the empty section) */
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.pad : { BYTE(0); . = ALIGN(8); }
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_edata = .;
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_magic_sig = ZIMAGE_MAGIC(0x016f2818);
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_magic_start = ZIMAGE_MAGIC(_start);
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_magic_end = ZIMAGE_MAGIC(_edata);
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. = BSS_START;
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__bss_start = .;
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.bss : { *(.bss) }
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_end = .;
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. = ALIGN(8); /* the stack must be 64-bit aligned */
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.stack : { *(.stack) }
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.stab 0 : { *(.stab) }
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.stabstr 0 : { *(.stabstr) }
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.stab.excl 0 : { *(.stab.excl) }
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.stab.exclstr 0 : { *(.stab.exclstr) }
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.stab.index 0 : { *(.stab.index) }
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.stab.indexstr 0 : { *(.stab.indexstr) }
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.comment 0 : { *(.comment) }
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}
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