mirror of
https://github.com/SerenityOS/serenity
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c1dc55ec7c
This function was only used to verify that we are running in kernel mode. But it is pretty much impossible that we will ever end up in kernel code and actually are able to execute it in user mode. A lot of stuff must go completely wrong to end up in such a situation. Getting the current privilege level is also impossible on RISC-V by design.
136 lines
4.2 KiB
C++
136 lines
4.2 KiB
C++
/*
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* Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/Processor.h>
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#include <Kernel/Arch/TrapFrame.h>
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#include <Kernel/Interrupts/InterruptDisabler.h>
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#include <Kernel/Sections.h>
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#include <Kernel/Tasks/Scheduler.h>
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#include <Kernel/Tasks/Thread.h>
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namespace Kernel {
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READONLY_AFTER_INIT FPUState s_clean_fpu_state;
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READONLY_AFTER_INIT Atomic<u32> g_total_processors;
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template<typename T>
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void ProcessorBase<T>::check_invoke_scheduler()
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{
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VERIFY_INTERRUPTS_DISABLED();
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VERIFY(!m_in_irq);
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VERIFY(!m_in_critical);
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VERIFY(&Processor::current() == this);
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if (m_invoke_scheduler_async && m_scheduler_initialized.was_set()) {
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m_invoke_scheduler_async = false;
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Scheduler::invoke_async();
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}
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}
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template void ProcessorBase<Processor>::check_invoke_scheduler();
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template<typename T>
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void ProcessorBase<T>::deferred_call_queue(Function<void()> callback)
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{
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// NOTE: If we are called outside of a critical section and outside
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// of an irq handler, the function will be executed before we return!
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ScopedCritical critical;
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auto& cur_proc = Processor::current();
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auto* entry = cur_proc.m_deferred_call_pool.get_free();
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entry->handler_value() = move(callback);
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cur_proc.m_deferred_call_pool.queue_entry(entry);
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}
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template void ProcessorBase<Processor>::deferred_call_queue(Function<void()>);
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template<typename T>
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void ProcessorBase<T>::enter_trap(TrapFrame& trap, bool raise_irq)
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{
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VERIFY_INTERRUPTS_DISABLED();
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VERIFY(&Processor::current() == this);
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#if ARCH(X86_64)
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// FIXME: Figure out if we need prev_irq_level
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trap.prev_irq_level = m_in_irq;
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#endif
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if (raise_irq)
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m_in_irq++;
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auto* current_thread = Processor::current_thread();
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if (current_thread) {
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auto& current_trap = current_thread->current_trap();
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trap.next_trap = current_trap;
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current_trap = &trap;
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auto new_previous_mode = trap.regs->previous_mode();
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if (current_thread->set_previous_mode(new_previous_mode)) {
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current_thread->update_time_scheduled(TimeManagement::scheduler_current_time(), new_previous_mode == ExecutionMode::Kernel, false);
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}
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} else {
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trap.next_trap = nullptr;
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}
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}
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template void ProcessorBase<Processor>::enter_trap(TrapFrame&, bool);
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template<typename T>
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u64 ProcessorBase<T>::time_spent_idle() const
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{
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return m_idle_thread->time_in_user() + m_idle_thread->time_in_kernel();
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}
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template u64 ProcessorBase<Processor>::time_spent_idle() const;
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template<typename T>
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void ProcessorBase<T>::leave_critical()
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{
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InterruptDisabler disabler;
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current().do_leave_critical();
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}
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template void ProcessorBase<Processor>::leave_critical();
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template<typename T>
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void ProcessorBase<T>::do_leave_critical()
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{
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VERIFY(m_in_critical > 0);
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if (m_in_critical == 1) {
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if (m_in_irq == 0) {
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m_deferred_call_pool.execute_pending();
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VERIFY(m_in_critical == 1);
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}
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m_in_critical = 0;
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if (m_in_irq == 0)
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check_invoke_scheduler();
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} else {
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m_in_critical = m_in_critical - 1;
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}
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}
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template void ProcessorBase<Processor>::do_leave_critical();
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void exit_kernel_thread(void)
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{
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Thread::current()->exit();
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}
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void do_context_first_init(Thread* from_thread, Thread* to_thread)
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{
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VERIFY(!Processor::are_interrupts_enabled());
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dbgln_if(CONTEXT_SWITCH_DEBUG, "switch_context <-- from {} {} to {} {} (context_first_init)", VirtualAddress(from_thread), *from_thread, VirtualAddress(to_thread), *to_thread);
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VERIFY(to_thread == Thread::current());
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Scheduler::enter_current(*from_thread);
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auto in_critical = to_thread->saved_critical();
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VERIFY(in_critical > 0);
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Processor::restore_critical(in_critical);
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// Since we got here and don't have Scheduler::context_switch in the
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// call stack (because this is the first time we switched into this
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// context), we need to notify the scheduler so that it can release
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// the scheduler lock. We don't want to enable interrupts at this point
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// as we're still in the middle of a context switch. Doing so could
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// trigger a context switch within a context switch, leading to a crash.
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Scheduler::leave_on_first_switch(InterruptsState::Disabled);
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}
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}
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