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Kernel: Add RPi Watchdog and use it for system shutdown

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The Raspberry Pi hardware doesn't support a proper software-initiated
shutdown, so this instead uses the watchdog to reboot to a special
partition which the firmware interprets as an immediate halt on
shutdown. When running under Qemu, this causes the emulator to exit.
This commit is contained in:
Daniel Bertalan 2023-05-15 07:34:19 +02:00 • committed by Andrew Kaster
parent 555d301e3b
commit d9c557d0b4
5 changed files with 80 additions and 0 deletions
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4
Kernel/FileSystem/SysFS/Subsystems/Kernel/PowerStateSwitch.cpp
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@ -9,6 +9,8 @@
#if ARCH(X86_64)
# include <Kernel/Arch/x86_64/I8042Reboot.h>
# include <Kernel/Arch/x86_64/Shutdown.h>
#elif ARCH(AARCH64)
# include <Kernel/Arch/aarch64/RPi/Watchdog.h>
#endif
#include <Kernel/FileSystem/FileSystem.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/PowerStateSwitch.h>
@ -101,6 +103,8 @@ void SysFSPowerStateSwitchNode::poweroff()
#if ARCH(X86_64)
qemu_shutdown();
virtualbox_shutdown();
#elif ARCH(AARCH64)
RPi::Watchdog::the().system_shutdown();
#endif
dbgln("shutdown attempts failed, applications will stop responding.");
dmesgln("Shutdown can't be completed. It's safe to turn off the computer!");