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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 MODE_RDRW 2
#define FLAGS_NONE 0
#define SYSCALL_ARCH 165
#define SYSCALL_OPEN 5
#define SYSCALL_WRITE 4
#define SYSCALL_RESET 55
#define SYSCALL_EXIT 1
#define SYSCALL_ARCH_IOPL 4
#define SYSCALL_FSYNC 95
#define RESET_NOSYNC 0x4
#define RESET_HALT 0x8
#define RESET_POWEROFF 0x4000
#define SHUTDOWN_PORT 0x8900
.section ".init", "ax"
.global start,_start
start:
_start:
/* open. */
movq $SYSCALL_OPEN, %rax
leaq device, %rdi
movq $MODE_RDRW, %rsi
movq $FLAGS_NONE, %rdx
syscall
movq %rax, %rdi
/* write. */
leaq message, %rsi
movq $SYSCALL_WRITE, %rax
movq $(messageend - message), %rdx
syscall
/* fsync. */
movq $SYSCALL_FSYNC, %rax
syscall
/* IOPL. */
movq $SYSCALL_ARCH, %rax
movq $SYSCALL_ARCH_IOPL, %rdi
leaq iopl_arg, %rsi
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 $(RESET_POWEROFF|RESET_HALT|RESET_NOSYNC), %rdi
syscall
/* exit (1). Shouldn't be reached. */
movq $SYSCALL_EXIT, %rax
movq $1, %rdi
syscall
device:
.ascii "/dev/console"
.byte 0
message:
.ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n"
messageend:
iopl_arg:
.long SHUTDOWN_PORT
.long 1
.long 1
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