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https://github.com/RGBCube/serenity
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9b8b8c0e04
Instead of using ifdefs to use the correct platform-specific methods, we can just use the same pattern we use for the microseconds_delay function which has specific implementations for each Arch CPU subdirectory. When linking a kernel image, the actual correct and platform-specific power-state changing methods will be called in Firmware/PowerState.cpp file.
67 lines
2.1 KiB
C++
67 lines
2.1 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 <AK/Platform.h>
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#include <Kernel/FileSystem/FileSystem.h>
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#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/PowerStateSwitch.h>
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#include <Kernel/Firmware/ACPI/Parser.h>
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#include <Kernel/Firmware/PowerState.h>
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#include <Kernel/Sections.h>
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#include <Kernel/TTY/ConsoleManagement.h>
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#include <Kernel/Tasks/Process.h>
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namespace Kernel {
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mode_t SysFSPowerStateSwitchNode::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<SysFSPowerStateSwitchNode> SysFSPowerStateSwitchNode::must_create(SysFSDirectory const& parent_directory)
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{
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return adopt_ref_if_nonnull(new (nothrow) SysFSPowerStateSwitchNode(parent_directory)).release_nonnull();
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}
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UNMAP_AFTER_INIT SysFSPowerStateSwitchNode::SysFSPowerStateSwitchNode(SysFSDirectory const& parent_directory)
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: SysFSComponent(parent_directory)
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{
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}
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ErrorOr<void> SysFSPowerStateSwitchNode::truncate(u64 size)
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{
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// Note: This node doesn't store any useful data anyway, so we can safely
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// truncate this to zero (essentially ignoring the request without failing).
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if (size != 0)
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return EPERM;
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return {};
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}
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ErrorOr<size_t> SysFSPowerStateSwitchNode::write_bytes(off_t offset, size_t count, UserOrKernelBuffer const& data, OpenFileDescription*)
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{
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// Note: If we are in a jail, don't let the current process to change the power state.
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if (Process::current().is_currently_in_jail())
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return Error::from_errno(EPERM);
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if (Checked<off_t>::addition_would_overflow(offset, count))
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return Error::from_errno(EOVERFLOW);
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if (offset > 0)
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return Error::from_errno(EINVAL);
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if (count > 1)
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return Error::from_errno(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 '1':
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Firmware::reboot();
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VERIFY_NOT_REACHED();
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case '2':
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Firmware::poweroff();
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VERIFY_NOT_REACHED();
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default:
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return Error::from_errno(EINVAL);
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}
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}
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}
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