mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-31 07:13:44 +09:00
96a8d409a7
Most EFI implementations use 64-bit. Add a way to build U-Boot as a 64-bit EFI payload. The payload unpacks a (32-bit) U-Boot and starts it. This can be enabled for x86 boards at present. Signed-off-by: Simon Glass <sjg@chromium.org> Improvements to how the payload is built: Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
52 lines
890 B
ArmAsm
52 lines
890 B
ArmAsm
/*
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* crt0-efi-x86_64.S - x86_64 EFI startup code.
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Contributed by David Mosberger <davidm@hpl.hp.com>.
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* Copyright (C) 2005 Intel Co.
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* Contributed by Fenghua Yu <fenghua.yu@intel.com>.
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*
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* All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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.text
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.align 4
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.globl _start
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_start:
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subq $8, %rsp
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pushq %rcx
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pushq %rdx
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0:
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lea image_base(%rip), %rdi
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lea _DYNAMIC(%rip), %rsi
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popq %rcx
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popq %rdx
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pushq %rcx
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pushq %rdx
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call _relocate
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popq %rdi
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popq %rsi
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call efi_main
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addq $8, %rsp
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.exit:
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ret
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/*
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* hand-craft a dummy .reloc section so EFI knows it's a relocatable
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* executable:
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*/
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.data
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dummy: .long 0
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#define IMAGE_REL_ABSOLUTE 0
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.section .reloc, "a"
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label1:
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.long dummy-label1 /* Page RVA */
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.long 10 /* Block Size (2*4+2) */
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.word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */
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