| /* |
| * 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 |
