/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 2010  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/>.
 */

#define MODE_RDRW 2
#define FLAGS_NONE 0
#define SYSCALL_OPEN 5
#define SYSCALL_WRITE 4
#define SYSCALL_RESET 208
#define SYSCALL_EXIT 1
#define SYSCALL_MKNOD 14
#define SYSCALL_MOUNT 410
#define SYSCALL_INT 0x80

#define RESET_NOSYNC 0x4
#define RESET_HALT 0x8
#define RESET_POWEROFF 0x800

	.section ".init", "ax"
	.global start,_start
start:
_start:
	/* mount.  */
	movl $SYSCALL_MOUNT, %eax
	push $(tmpfs_args_end - tmpfs_args)
	push $tmpfs_args
	push $0
	push $devfsdir
	push $devfstype
	pushl $0
	int $SYSCALL_INT
	addl $20, %esp

	/* mknod.  */
	movl $SYSCALL_MKNOD, %eax
	pushl $0
	pushl $0x2140
	leal device, %ebx
	pushl %ebx
	pushl $0
	int $SYSCALL_INT
	addl $16, %esp

	/* open.  */
	movl $SYSCALL_OPEN, %eax
	pushl $FLAGS_NONE
	pushl $MODE_RDRW
	leal device, %ebx
	pushl %ebx
	pushl $0
	int $SYSCALL_INT
	addl $16, %esp
	movl %eax, %ecx

	/* write.  */
	movl $SYSCALL_WRITE, %eax
	pushl $(messageend-message)
	leal message, %ebx
	pushl %ebx
	pushl %ecx
	pushl $0
	int $SYSCALL_INT
	addl $16, %esp

	/* shutdown.  */
	movl $SYSCALL_RESET, %eax
	pushl $haltmsg
	pushl $(RESET_POWEROFF|RESET_HALT|RESET_NOSYNC)
	pushl $0
	int $SYSCALL_INT
	addl $8, %esp

	/* exit (1). Shouldn't be reached.  */
	movl $SYSCALL_EXIT, %eax
	pushl $1
	pushl $0
	int $SYSCALL_INT
	.section ".fini", "ax"
1:	jmp 1b
	.section ".text", "ax"
1:	jmp 1b
	/* This section is needed for NetBSD to identify the binary.  */
	.section ".note.netbsd.ident", "a"
	.long 0x7
	.long 0x4
	.long 0x1
	.ascii "NetBSD"
	.byte 0
	.data
device:
	.ascii "/dev/console"
	.byte 0
message:
	.ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n"
messageend:
haltmsg:
	.ascii "Machine halted"
	.byte 0
devfstype:
	.ascii "tmpfs"
	.byte 0
devfsdir:
	.ascii "/dev"
	.byte 0
tmpfs_args:
	/* Version.  */
	.long 1

	/* Maximum inodes.  */
	.quad 	0
	/* Maximum size.  */
	.quad   0

	/* UID */
	.long		0
	/* GID */
	.long 		0
	/* Mode */
	.long		0777
tmpfs_args_end: