98 lines
2.1 KiB
ArmAsm
98 lines
2.1 KiB
ArmAsm
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB 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 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB 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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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define MODE_RDRW 2
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#define FLAGS_NONE 0
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#define SYSCALL_ARCH 165
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#define SYSCALL_OPEN 5
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#define SYSCALL_WRITE 4
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#define SYSCALL_RESET 55
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#define SYSCALL_EXIT 1
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#define SYSCALL_ARCH_IOPL 4
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#define SYSCALL_FSYNC 95
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#define RESET_NOSYNC 0x4
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#define RESET_HALT 0x8
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#define RESET_POWEROFF 0x4000
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#define SHUTDOWN_PORT 0x8900
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.section ".init", "ax"
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.global start,_start
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start:
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_start:
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/* open. */
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movq $SYSCALL_OPEN, %rax
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leaq device, %rdi
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movq $MODE_RDRW, %rsi
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movq $FLAGS_NONE, %rdx
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syscall
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movq %rax, %rdi
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/* write. */
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leaq message, %rsi
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movq $SYSCALL_WRITE, %rax
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movq $(messageend - message), %rdx
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syscall
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/* fsync. */
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movq $SYSCALL_FSYNC, %rax
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syscall
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/* IOPL. */
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movq $SYSCALL_ARCH, %rax
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movq $SYSCALL_ARCH_IOPL, %rdi
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leaq iopl_arg, %rsi
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syscall
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movw $SHUTDOWN_PORT, %dx
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movb $'S', %al
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outb %al, %dx
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movb $'h', %al
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outb %al, %dx
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movb $'u', %al
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outb %al, %dx
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movb $'t', %al
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outb %al, %dx
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movb $'d', %al
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outb %al, %dx
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movb $'o', %al
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outb %al, %dx
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movb $'w', %al
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outb %al, %dx
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movb $'n', %al
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outb %al, %dx
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/* shutdown. */
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movq $SYSCALL_RESET, %rax
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movq $(RESET_POWEROFF|RESET_HALT|RESET_NOSYNC), %rdi
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syscall
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/* exit (1). Shouldn't be reached. */
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movq $SYSCALL_EXIT, %rax
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movq $1, %rdi
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syscall
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device:
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.ascii "/dev/console"
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.byte 0
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message:
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.ascii "Boot Test Passed Successfully\n" SUCCESSFUL_BOOT_STRING "\n"
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messageend:
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iopl_arg:
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.long SHUTDOWN_PORT
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.long 1
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.long 1
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