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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Arch/x86/IO.h>
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/Firmware/ACPI/Parser.h>
#include <Kernel/Firmware/PowerStateSwitch.h>
#include <Kernel/Process.h>
#include <Kernel/Sections.h>
#include <Kernel/TTY/ConsoleManagement.h>
namespace Kernel {
mode_t PowerStateSwitchNode::permissions() const
{
return S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
}
UNMAP_AFTER_INIT NonnullRefPtr<PowerStateSwitchNode> PowerStateSwitchNode::must_create(FirmwareSysFSDirectory& firmware_directory)
{
return adopt_ref_if_nonnull(new (nothrow) PowerStateSwitchNode(firmware_directory)).release_nonnull();
}
UNMAP_AFTER_INIT PowerStateSwitchNode::PowerStateSwitchNode(FirmwareSysFSDirectory&)
: SysFSComponent()
{
}
ErrorOr<void> PowerStateSwitchNode::truncate(u64 size)
{
// Note: This node doesn't store any useful data anyway, so we can safely
// truncate this to zero (essentially ignoring the request without failing).
if (size != 0)
return EPERM;
return {};
}
ErrorOr<size_t> PowerStateSwitchNode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& data, OpenFileDescription*)
{
if (Checked<off_t>::addition_would_overflow(offset, count))
return EOVERFLOW;
if (offset > 0)
return EINVAL;
if (count > 1)
return EINVAL;
char buf[1];
TRY(data.read(buf, 1));
switch (buf[0]) {
case '0':
return EINVAL;
case '1':
reboot();
VERIFY_NOT_REACHED();
case '2':
poweroff();
VERIFY_NOT_REACHED();
default:
return EINVAL;
}
VERIFY_NOT_REACHED();
}
void PowerStateSwitchNode::reboot()
{
MutexLocker locker(Process::current().big_lock());
dbgln("acquiring FS locks...");
FileSystem::lock_all();
dbgln("syncing mounted filesystems...");
FileSystem::sync();
dbgln("attempting reboot via ACPI");
if (ACPI::is_enabled())
ACPI::Parser::the()->try_acpi_reboot();
dbgln("attempting reboot via KB Controller...");
IO::out8(0x64, 0xFE);
dbgln("reboot attempts failed, applications will stop responding.");
dmesgln("Reboot can't be completed. It's safe to turn off the computer!");
Processor::halt();
}
void PowerStateSwitchNode::poweroff()
{
MutexLocker locker(Process::current().big_lock());
ConsoleManagement::the().switch_to_debug();
dbgln("acquiring FS locks...");
FileSystem::lock_all();
dbgln("syncing mounted filesystems...");
FileSystem::sync();
dbgln("attempting system shutdown...");
// QEMU Shutdown
IO::out16(0x604, 0x2000);
// If we're here, the shutdown failed. Try VirtualBox shutdown.
IO::out16(0x4004, 0x3400);
// VirtualBox shutdown failed. Try Bochs/Old QEMU shutdown.
IO::out16(0xb004, 0x2000);
dbgln("shutdown attempts failed, applications will stop responding.");
dmesgln("Shutdown can't be completed. It's safe to turn off the computer!");
Processor::halt();
}
}
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