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/*
* 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 SYSCALL_WRITE 1
#define SYSCALL_RESET 169
#define SYSCALL_IOPL 172
#define SYSCALL_EXIT 60
#define STDOUT 1
#define SHUTDOWN_MAGIC1 0xfee1dead
#define SHUTDOWN_MAGIC2 0x28121969
#define SHUTDOWN_MAGIC3 0x4321fedc
#define SHUTDOWN_PORT 0x8900
.text
.global start, _start
_start:
start:
/* write. */
movq $SYSCALL_WRITE, %rax
movq $STDOUT, %rdi
leaq message, %rsi
movq $(messageend-message), %rdx
syscall
movq $SYSCALL_IOPL, %rax
movq $3, %rdi
syscall
movw $SHUTDOWN_PORT, %dx
movb $'S', %al
outb %al, %dx
movb $'h', %al
outb %al, %dx
movb $'u', %al
outb %al, %dx
movb $'t', %al
outb %al, %dx
movb $'d', %al
outb %al, %dx
movb $'o', %al
outb %al, %dx
movb $'w', %al
outb %al, %dx
movb $'n', %al
outb %al, %dx
/* shutdown. */
movq $SYSCALL_RESET, %rax
movq $SHUTDOWN_MAGIC1, %rdi
movq $SHUTDOWN_MAGIC2, %rsi
movq $SHUTDOWN_MAGIC3, %rdx
syscall
/* exit(1). Shouldn't be reached. */
movq $SYSCALL_EXIT, %rax
movq $1, %rdi
syscall
.data
message:
.ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n"
messageend:
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