diff options
| author | Ben Stoltz <stoltz@google.com> | 2015-08-04 12:33:46 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-05 08:44:06 -0600 |
| commit | 3dcdd17b43c5cfd3a216169948dfd08d6741c631 (patch) | |
| tree | 662ddb941487ea3be651530fc6ad9f74e8f6632d /arch/x86/lib/efi/crt0-efi-ia32.S | |
| parent | ed3b4d37368694e682c2c24f2fd72414d3f645ae (diff) | |
| download | u-boot-imx-3dcdd17b43c5cfd3a216169948dfd08d6741c631.zip u-boot-imx-3dcdd17b43c5cfd3a216169948dfd08d6741c631.tar.gz u-boot-imx-3dcdd17b43c5cfd3a216169948dfd08d6741c631.tar.bz2 | |
x86: Add support for U-Boot as an EFI application
Add the required x86 glue code. This includes the initial start-up,
relocation and jumping to efi_main(). We also need to avoid fiddling with
interrupts.
Signed-off-by: Ben Stoltz <stoltz@google.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch/x86/lib/efi/crt0-efi-ia32.S')
| -rw-r--r-- | arch/x86/lib/efi/crt0-efi-ia32.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/x86/lib/efi/crt0-efi-ia32.S b/arch/x86/lib/efi/crt0-efi-ia32.S new file mode 100644 index 0000000..30e5eb0 --- /dev/null +++ b/arch/x86/lib/efi/crt0-efi-ia32.S @@ -0,0 +1,52 @@ +/* + * crt0-efi-ia32.S - x86 EFI startup code. + * + * Copyright (C) 1999 Hewlett-Packard Co. + * Contributed by David Mosberger <davidm@hpl.hp.com>. + * All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + + .text + .align 4 + + .globl _start +_start: + pushl %ebp + movl %esp,%ebp + + pushl 12(%ebp) # copy "image" argument + pushl 8(%ebp) # copy "systab" argument + + call 0f +0: popl %eax + movl %eax,%ebx + + addl $image_base-0b,%eax # %eax = ldbase + addl $_DYNAMIC-0b,%ebx # %ebx = _DYNAMIC + + pushl %ebx # pass _DYNAMIC as second argument + pushl %eax # pass ldbase as first argument + call _relocate + popl %ebx + popl %ebx + testl %eax,%eax + jne .exit + call efi_main # call app with "image" and "systab" argument + +.exit: leave + 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 + .long dummy /* Page RVA */ + .long 10 /* Block Size (2*4+2) */ + .word (IMAGE_REL_ABSOLUTE << 12) + 0 /* reloc for dummy */ |