mirror of
git://git.git.savannah.gnu.org/grub.git
synced 2026-08-19 06:56:15 +00:00
Vladimir Serbinenko
120 lines
2.9 KiB
ArmAsm
120 lines
2.9 KiB
ArmAsm
/* boot.S - bootstrap the kernel */
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/* Copyright (C) 1999, 2001, 2010 Free Software Foundation, Inc.
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*
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* This program 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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* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define ASM_FILE 1
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#include <multiboot2.h>
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/* C symbol format. HAVE_ASM_USCORE is defined by configure. */
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#ifdef HAVE_ASM_USCORE
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# define EXT_C(sym) _ ## sym
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#else
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# define EXT_C(sym) sym
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#endif
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/* The size of our stack (16KB). */
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#define STACK_SIZE 0x4000
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/* The flags for the Multiboot header. */
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#ifdef __ELF__
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# define AOUT_KLUDGE 0
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#else
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# define AOUT_KLUDGE MULTIBOOT_AOUT_KLUDGE
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#endif
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.text
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.set noreorder
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.set nomacro
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.globl start, _start
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start:
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_start:
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b multiboot_entry
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nop
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/* Align 64 bits boundary. */
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.align 8
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/* Multiboot header. */
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multiboot_header:
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/* magic */
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.long MULTIBOOT2_HEADER_MAGIC
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/* ISA: mips32 */
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.long MULTIBOOT_ARCHITECTURE_MIPS32
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/* Header length. */
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.long multiboot_header_end - multiboot_header
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/* checksum */
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.long -(MULTIBOOT2_HEADER_MAGIC + MULTIBOOT_ARCHITECTURE_MIPS32 + (multiboot_header_end - multiboot_header))
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#ifndef __ELF__
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address_tag_start:
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.short MULTIBOOT_HEADER_TAG_ADDRESS
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.short MULTIBOOT_HEADER_TAG_OPTIONAL
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.long address_tag_end - address_tag_start
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/* header_addr */
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.long multiboot_header
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/* load_addr */
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.long _start
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/* load_end_addr */
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.long _edata
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/* bss_end_addr */
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.long _end
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address_tag_end:
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entry_address_tag_start:
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.short MULTIBOOT_HEADER_TAG_ENTRY_ADDRESS
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.short MULTIBOOT_HEADER_TAG_OPTIONAL
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.long entry_address_tag_end - entry_address_tag_start
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/* entry_addr */
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.long multiboot_entry
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entry_address_tag_end:
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#endif /* __ELF__ */
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framebuffer_tag_start:
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.short MULTIBOOT_HEADER_TAG_FRAMEBUFFER
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.short MULTIBOOT_HEADER_TAG_OPTIONAL
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.long framebuffer_tag_end - framebuffer_tag_start
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.long 1024
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.long 768
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.long 32
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framebuffer_tag_end:
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.short MULTIBOOT_HEADER_TAG_END
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.short 0
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.long 8
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multiboot_header_end:
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multiboot_entry:
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/* Initialize the stack pointer. */
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lui $sp, %hi (stack + STACK_SIZE)
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addiu $sp, $sp, %lo (stack + STACK_SIZE)
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/* Now enter the C main function... */
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bal EXT_C(cmain)
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nop
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/* Halt. */
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lui $a0, %hi (halt_message)
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addiu $a0, $a0, %lo (halt_message)
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bal EXT_C(printf)
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nop
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loop: nop
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b loop
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nop
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halt_message:
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.asciz "Halted."
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.align 8
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/* Our stack area. */
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.comm stack, STACK_SIZE
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