RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 01:37:36 +00:00
Code Issues Activity Actions

Kernel+Userland: Introduce a new way to reboot and poweroff the machine

Browse source 
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.
This commit is contained in:
Liav A 2021-09-11 12:20:47 +03:00 • committed by Andreas Kling
parent 06e95d0fd7
commit 8d0dbdeaac
11 changed files with 161 additions and 97 deletions
Download patch file Download diff file Expand all files Collapse all files

61
Kernel/Syscalls/shutdown.cpp
View file

@ -1,61 +0,0 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/Firmware/ACPI/Parser.h>
#include <Kernel/IO.h>
#include <Kernel/Process.h>
#include <Kernel/TTY/ConsoleManagement.h>
namespace Kernel {
KResultOr<FlatPtr> Process::sys$reboot()
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
if (!is_superuser())
return EPERM;
REQUIRE_NO_PROMISES;
dbgln("acquiring FS locks...");
FileSystem::lock_all();
dbgln("syncing mounted filesystems...");
FileSystem::sync();
dbgln("attempting reboot via ACPI");
if (ACPI::is_enabled())
ACPI::Parser::the()->try_acpi_reboot();
dbgln("attempting reboot via KB Controller...");
IO::out8(0x64, 0xFE);
return 0;
}
KResultOr<FlatPtr> Process::sys$halt()
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
if (!is_superuser())
return EPERM;
REQUIRE_NO_PROMISES;
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();
}
}