89 lines
2.3 KiB
ArmAsm
89 lines
2.3 KiB
ArmAsm
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/symbol.h>
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#include <grub/machine/memory.h>
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#include <grub/cpu/linux.h>
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#include <grub/offsets.h>
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#include <multiboot.h>
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#include <multiboot2.h>
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/*
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* Note: GRUB is compiled with the options -mrtd and -mregparm=3.
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* So the first three arguments are passed in %eax, %edx, and %ecx,
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* respectively, and if a function has a fixed number of arguments
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* and the number if greater than three, the function must return
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* with "ret $N" where N is ((the number of arguments) - 3) * 4.
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*/
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.file "startup.S"
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.text
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.globl start, _start
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start:
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_start:
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jmp codestart
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/*
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* This is a special data area at a fixed offset from the beginning.
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*/
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. = _start + GRUB_KERNEL_MACHINE_PREFIX
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VARIABLE(grub_prefix)
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/* to be filled by grub-mkimage */
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/*
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* Leave some breathing room for the prefix.
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*/
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. = _start + GRUB_KERNEL_MACHINE_DATA_END
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/*
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* Support for booting GRUB from a Multiboot boot loader (e.g. GRUB itself).
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*/
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.p2align 2 /* force 4-byte alignment */
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multiboot_header:
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/* magic */
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.long 0x1BADB002
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/* flags */
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.long MULTIBOOT_MEMORY_INFO
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/* checksum */
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.long -0x1BADB002 - MULTIBOOT_MEMORY_INFO
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codestart:
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cmpl $MULTIBOOT_BOOTLOADER_MAGIC, %eax
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jne 0f
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movl %ebx, EXT_C(startup_multiboot_info)
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0:
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/* initialize the stack */
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movl $GRUB_MEMORY_MACHINE_PROT_STACK, %esp
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/* jump to the main body of C code */
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jmp EXT_C(grub_main)
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/*
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* prot_to_real and associated structures (but NOT real_to_prot, that is
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* only needed for BIOS gates).
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*/
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#include "../realmode.S"
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/*
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* Routines needed by Linux and Multiboot loaders.
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*/
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#include "../loader.S"
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