| /* |
| * GRUB -- GRand Unified Bootloader |
| * Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008 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 <grub/symbol.h> |
| #include <grub/machine/memory.h> |
| #include <grub/cpu/linux.h> |
| #include <grub/offsets.h> |
| #include <multiboot.h> |
| #include <multiboot2.h> |
| |
| /* |
| * Note: GRUB is compiled with the options -mrtd and -mregparm=3. |
| * So the first three arguments are passed in %eax, %edx, and %ecx, |
| * respectively, and if a function has a fixed number of arguments |
| * and the number if greater than three, the function must return |
| * with "ret $N" where N is ((the number of arguments) - 3) * 4. |
| */ |
| |
| .file "startup.S" |
| .text |
| .globl start, _start |
| start: |
| _start: |
| #ifdef GRUB_MACHINE_MULTIBOOT |
| cmpl $MULTIBOOT_BOOTLOADER_MAGIC, %eax |
| jne 0f |
| movl %ebx, EXT_C(startup_multiboot_info) |
| 0: |
| #endif |
| |
| /* initialize the stack */ |
| movl $GRUB_MEMORY_MACHINE_PROT_STACK, %esp |
| |
| /* jump to the main body of C code */ |
| jmp EXT_C(grub_main) |
| |
| /* |
| * Support for booting GRUB from a Multiboot boot loader (e.g. GRUB itself). |
| */ |
| .p2align 2 /* force 4-byte alignment */ |
| multiboot_header: |
| /* magic */ |
| .long 0x1BADB002 |
| /* flags */ |
| .long MULTIBOOT_MEMORY_INFO |
| /* checksum */ |
| .long -0x1BADB002 - MULTIBOOT_MEMORY_INFO |
| |