diff options
| author | Simon Glass <sjg@chromium.org> | 2015-08-04 12:33:56 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-05 08:44:07 -0600 |
| commit | 96a8d409a75af99ac7a9a9ba707d544f9cf44fc0 (patch) | |
| tree | 42d2df0ab57c55ce9f0a191b97fb88a7858b81ff /arch/x86/lib/efi/crt0-efi-x86_64.S | |
| parent | 6f92ed8f1abfe94ee1c96c83c21f4092bb04ff63 (diff) | |
efi: Add 64-bit payload support
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>
Diffstat (limited to 'arch/x86/lib/efi/crt0-efi-x86_64.S')
| -rw-r--r-- | arch/x86/lib/efi/crt0-efi-x86_64.S | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/x86/lib/efi/crt0-efi-x86_64.S b/arch/x86/lib/efi/crt0-efi-x86_64.S new file mode 100644 index 0000000000..c5cbf4108b --- /dev/null +++ b/arch/x86/lib/efi/crt0-efi-x86_64.S @@ -0,0 +1,51 @@ +/* + * crt0-efi-x86_64.S - x86_64 EFI startup code. + * Copyright (C) 1999 Hewlett-Packard Co. + * Contributed by David Mosberger <davidm@hpl.hp.com>. + * Copyright (C) 2005 Intel Co. + * Contributed by Fenghua Yu <fenghua.yu@intel.com>. + * + * All rights reserved. + * SPDX-License-Identifier: BSD-3-Clause + */ + .text + .align 4 + + .globl _start +_start: + subq $8, %rsp + pushq %rcx + pushq %rdx + +0: + lea image_base(%rip), %rdi + lea _DYNAMIC(%rip), %rsi + + popq %rcx + popq %rdx + pushq %rcx + pushq %rdx + call _relocate + + popq %rdi + popq %rsi + + call efi_main + addq $8, %rsp + +.exit: + ret + + /* + * hand-craft a dummy .reloc section so EFI knows it's a relocatable + * executable: + */ + .data +dummy: .long 0 + +#define IMAGE_REL_ABSOLUTE 0 + .section .reloc, "a" +label1: + .long dummy-label1 /* Page RVA */ + .long 10 /* Block Size (2*4+2) */ + .word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */ |