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sortix--sortix/kernel/panic.cpp

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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2013.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
details.
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You should have received a copy of the GNU General Public License along with
Sortix. If not, see <http://www.gnu.org/licenses/>.
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panic.cpp
Displays an error whenever something critical happens.
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*******************************************************************************/
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#include <brand.h>
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#include <string.h>
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#include <sortix/kernel/interrupt.h>
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#include <sortix/kernel/kernel.h>
#include <sortix/kernel/log.h>
#include <sortix/kernel/panic.h>
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namespace Sortix {
#if defined(PANIC_SHORT)
const bool longpanic = false;
#else
const bool longpanic = true;
#endif
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static bool panicing = false;
static bool doublepanic = false;
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static bool logrecovering = false;
void PanicInit()
{
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// TODO: Some panics are soft the console rendering and core features are
// perfectly online, they do not need too paranoid handling here,
// while others (like a real kernel crash) is critical and this is
// needed. Supply multiple kernel panicing interfaces and switch code
// to using them instead.
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// This is a kernel emergency. We will need to disable preemption, such that
// this is the only thread running. This means that we cannot acquire locks
// and the data protected by them may be inconsistent.
Interrupt::Disable();
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// Detect if we are really early and we don't even have a log yet.
if ( !Log::device_callback )
HaltKernel();
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// Detect whether a panic happened during the log recovery.
if ( logrecovering )
{
// Oh no! We paniced during the log recovery that we will do momentarily
// - this means that there probably isn't anything we can do but halt.
HaltKernel();
}
logrecovering = true;
// The kernel log normally uses locks internally and the console may be
// rendered by a background thread. This means that we cannot use the normal
// kernel log, but that we rather need to switch to the kernel emergency
// log, which is able to cope with the potential inconsistencies.
Log::device_callback = Log::emergency_device_callback;
Log::device_width = Log::emergency_device_width;
Log::device_height = Log::emergency_device_height;
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Log::device_get_cursor = Log::emergency_device_get_cursor;
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Log::device_sync = Log::emergency_device_sync;
Log::device_pointer = Log::emergency_device_pointer;
// Check whether the panic condition left the kernel log unharmed.
if ( !Log::emergency_device_is_impaired(Log::emergency_device_pointer) )
{
// The kernel log device transitioned ideally to the emergency state.
}
// Attempt to repair inconsistent state of the emergency log device.
else if ( Log::emergency_device_recoup(Log::emergency_device_pointer) )
{
// The kernel log was successfully repaired and is ready for use in the
// current emergency state.
}
// It was not possible to repair the emergency device properly, so instead
// we will need to perform a hard reset of the emergency device.
else
{
Log::emergency_device_reset(Log::emergency_device_pointer);
// The kernel log was successfully repaired and is ready for use in the
// current emergency state.
}
// Handle the case where the panic code caused another system crash.
if ( panicing )
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{
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Log::Print("Panic while panicing:\n");
doublepanic = true;
return;
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}
panicing = true;
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// Render a notice that the system has crashed and forcefully shut down.
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if ( longpanic )
{
Log::Print("\e[m\e[31;40m\e[2J\e[H");
Log::Center(BRAND_MAXSI_DEAD);
Log::Center("KERNEL PANIC");
Log::Print("\n\nThe operating system encountered an unrecoverable "
"error.\n\nTechincal information:\n");
}
else
{
Log::Print("\e[m\e[31m\e[0Jkernel: panic: ");
}
}
extern "C" __attribute__((noreturn)) void Panic(const char* error)
{
PanicInit();
Log::Print(error);
HaltKernel();
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}
extern "C" __attribute__((noreturn)) void PanicF(const char* format, ...)
{
PanicInit();
va_list list;
va_start(list, format);
Log::PrintFV(format, list);
va_end(list);
HaltKernel();
}
} // namespace Sortix