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8d0dbdeaac
This change removes the halt and reboot syscalls, and create a new mechanism to change the power state of the machine. Instead of how power state was changed until now, put a SysFS node as writable only for the superuser, that with a defined value, can result in either reboot or poweroff. In the future, a power group can be assigned to this node (which will be the GroupID responsible for power management). This opens an opportunity to permit to shutdown/reboot without superuser permissions, so in the future, a userspace daemon can take control of this node to perform power management operations without superuser permissions, if we enforce different UserID/GroupID on that node.
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/Firmware/ACPI/Parser.h>
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#include <Kernel/Firmware/PowerStateSwitch.h>
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#include <Kernel/IO.h>
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#include <Kernel/Process.h>
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#include <Kernel/Sections.h>
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#include <Kernel/TTY/ConsoleManagement.h>
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namespace Kernel {
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mode_t PowerStateSwitchNode::permissions() const
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{
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return S_IRUSR | S_IRGRP | S_IWUSR | S_IWGRP;
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}
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UNMAP_AFTER_INIT NonnullRefPtr<PowerStateSwitchNode> PowerStateSwitchNode::must_create(FirmwareSysFSDirectory& firmware_directory)
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{
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return adopt_ref_if_nonnull(new (nothrow) PowerStateSwitchNode(firmware_directory)).release_nonnull();
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}
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UNMAP_AFTER_INIT PowerStateSwitchNode::PowerStateSwitchNode(FirmwareSysFSDirectory&)
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: SysFSComponent("power_state")
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{
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}
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KResultOr<size_t> PowerStateSwitchNode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& data, OpenFileDescription*)
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{
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if (Checked<off_t>::addition_would_overflow(offset, count))
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return EOVERFLOW;
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if (offset > 0)
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return EINVAL;
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if (count > 1)
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return EINVAL;
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char buf[1];
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TRY(data.read(buf, 1));
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switch (buf[0]) {
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case '0':
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return EINVAL;
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case '1':
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reboot();
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VERIFY_NOT_REACHED();
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case '2':
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poweroff();
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VERIFY_NOT_REACHED();
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default:
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return EINVAL;
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}
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VERIFY_NOT_REACHED();
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}
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void PowerStateSwitchNode::reboot()
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{
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MutexLocker locker(Process::current().big_lock());
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dbgln("acquiring FS locks...");
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FileSystem::lock_all();
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dbgln("syncing mounted filesystems...");
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FileSystem::sync();
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dbgln("attempting reboot via ACPI");
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if (ACPI::is_enabled())
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ACPI::Parser::the()->try_acpi_reboot();
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dbgln("attempting reboot via KB Controller...");
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IO::out8(0x64, 0xFE);
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dbgln("reboot attempts failed, applications will stop responding.");
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dmesgln("Reboot can't be completed. It's safe to turn off the computer!");
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Processor::halt();
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}
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void PowerStateSwitchNode::poweroff()
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{
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MutexLocker locker(Process::current().big_lock());
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ConsoleManagement::the().switch_to_debug();
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dbgln("acquiring FS locks...");
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FileSystem::lock_all();
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dbgln("syncing mounted filesystems...");
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FileSystem::sync();
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dbgln("attempting system shutdown...");
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// QEMU Shutdown
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IO::out16(0x604, 0x2000);
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// If we're here, the shutdown failed. Try VirtualBox shutdown.
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IO::out16(0x4004, 0x3400);
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// VirtualBox shutdown failed. Try Bochs/Old QEMU shutdown.
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IO::out16(0xb004, 0x2000);
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dbgln("shutdown attempts failed, applications will stop responding.");
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dmesgln("Shutdown can't be completed. It's safe to turn off the computer!");
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Processor::halt();
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}
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}
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