diff options
Diffstat (limited to 'grub-core/kern/x86_64/efi/startup.S')
| -rw-r--r-- | grub-core/kern/x86_64/efi/startup.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/grub-core/kern/x86_64/efi/startup.S b/grub-core/kern/x86_64/efi/startup.S new file mode 100644 index 0000000..fb4fc7b --- /dev/null +++ b/grub-core/kern/x86_64/efi/startup.S @@ -0,0 +1,63 @@ +/* startup.S - bootstrap GRUB itself */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2006,2007,2009 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <grub/symbol.h> +#include <grub/boot.h> + + .file "startup.S" + .text + .globl start, _start + .code64 + +start: +_start: + jmp codestart + + /* + * Compatibility version number + * + * These MUST be at byte offset 6 and 7 of the executable + * DO NOT MOVE !!! + */ + . = _start + 0x6 + .byte GRUB_BOOT_VERSION_MAJOR, GRUB_BOOT_VERSION_MINOR + + /* + * This is a special data area 8 bytes from the beginning. + */ + + . = _start + 0x8 + +VARIABLE(grub_prefix) + /* to be filled by grub-mkimage */ + + /* + * Leave some breathing room for the prefix. + */ + + . = _start + 0x50 + +codestart: + movq %rcx, EXT_C(grub_efi_image_handle)(%rip) + movq %rdx, EXT_C(grub_efi_system_table)(%rip) + + call EXT_C(grub_main) + ret + |