08ab8e9181
* docs/multiboot.h (MULTIBOOT_HEADER_FLAGS): Moved from here ... * docs/boot.S (MULTIBOOT_HEADER_FLAGS): ... to here.
96 lines
2.2 KiB
ArmAsm
96 lines
2.2 KiB
ArmAsm
/* boot.S - bootstrap the kernel */
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/* Copyright (C) 1999, 2001 Free Software Foundation, Inc.
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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 2 of the License, or
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(at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#define ASM_FILE 1
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#include <multiboot.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 MULTIBOOT_HEADER_FLAGS 0x00000003
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#else
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# define MULTIBOOT_HEADER_FLAGS 0x00010003
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#endif
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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 multiboot_entry
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/* Align 32 bits boundary. */
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.align 4
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/* Multiboot header. */
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multiboot_header:
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/* magic */
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.long MULTIBOOT_HEADER_MAGIC
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/* flags */
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.long MULTIBOOT_HEADER_FLAGS
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/* checksum */
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.long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
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#ifndef __ELF__
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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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/* entry_addr */
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.long multiboot_entry
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#endif /* ! __ELF__ */
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multiboot_entry:
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/* Initialize the stack pointer. */
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movl $(stack + STACK_SIZE), %esp
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/* Reset EFLAGS. */
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pushl $0
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popf
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/* Push the pointer to the Multiboot information structure. */
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pushl %ebx
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/* Push the magic value. */
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pushl %eax
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/* Now enter the C main function... */
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call EXT_C(cmain)
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/* Halt. */
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pushl $halt_message
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call EXT_C(printf)
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loop: hlt
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jmp loop
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halt_message:
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.asciz "Halted."
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/* Our stack area. */
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.comm stack, STACK_SIZE
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