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8163faf952
Allow placing a Linux kernel image header at the start of the U-Boot binary. This is useful since the image header reports the amount of memory (BSS and similar) that U-Boot needs to use, but that isn't part of the binary size. This can be used by the code that loads U-Boot into memory to determine where to load U-Boot, based on other users of memory. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
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* (C) Copyright 2017 NVIDIA Corporation <www.nvidia.com>
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*
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* Derived from Linux kernel v4.14 files:
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*
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* arch/arm64/include/asm/assembler.h:
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* Based on arch/arm/include/asm/assembler.h, arch/arm/mm/proc-macros.S
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* Copyright (C) 1996-2000 Russell King
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* Copyright (C) 2012 ARM Ltd.
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*
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* arch/arm64/kernel/head.S:
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* Based on arch/arm/kernel/head.S
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* Copyright (C) 1994-2002 Russell King
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* Copyright (C) 2003-2012 ARM Ltd.
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* Authors: Catalin Marinas <catalin.marinas@arm.com>
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* Will Deacon <will.deacon@arm.com>
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*
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* arch/arm64/kernel/image.h:
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* Copyright (C) 2014 ARM Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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/*
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* Emit a 64-bit absolute little endian symbol reference in a way that
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* ensures that it will be resolved at build time, even when building a
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* PIE binary. This requires cooperation from the linker script, which
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* must emit the lo32/hi32 halves individually.
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*/
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.macro le64sym, sym
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.long \sym\()_lo32
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.long \sym\()_hi32
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.endm
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.globl _start
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_start:
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/*
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* DO NOT MODIFY. Image header expected by Linux boot-loaders.
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*/
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b reset /* branch to kernel start, magic */
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.long 0 /* reserved */
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le64sym _kernel_offset_le /* Image load offset from start of RAM, little-endian */
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le64sym _kernel_size_le /* Effective size of kernel image, little-endian */
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le64sym _kernel_flags_le /* Informative flags, little-endian */
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.quad 0 /* reserved */
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.quad 0 /* reserved */
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.quad 0 /* reserved */
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.ascii "ARM\x64" /* Magic number */
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.long 0 /* reserved */
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