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Kernel/riscv64: Implement Processor::exit_trap

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This function is copy-pasted from aarch64's Processor.cpp
This commit is contained in:
Sönke Holz 2024-01-14 18:40:15 +01:00 committed by Andrew Kaster
parent 0e6659d1eb
commit 0111fe0d24
Notes: sideshowbarker 2024-07-17 11:34:34 +09:00 
Author: https://github.com/spholz
Commit: https://github.com/SerenityOS/serenity/commit/0111fe0d24
Pull-request: https://github.com/SerenityOS/serenity/pull/22845
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
1 changed files with 45 additions and 2 deletions
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47
Kernel/Arch/riscv64/Processor.cpp
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@ -116,10 +116,53 @@ FlatPtr ProcessorBase<T>::init_context(Thread&, bool)
TODO_RISCV64();
}
// FIXME: Figure out if we can fully share this code with x86.
template<typename T>
void ProcessorBase<T>::exit_trap(TrapFrame&)
void ProcessorBase<T>::exit_trap(TrapFrame& trap)
{
TODO_RISCV64();
VERIFY_INTERRUPTS_DISABLED();
VERIFY(&Processor::current() == this);
// Temporarily enter a critical section. This is to prevent critical
// sections entered and left within e.g. smp_process_pending_messages
// to trigger a context switch while we're executing this function
// See the comment at the end of the function why we don't use
// ScopedCritical here.
m_in_critical = m_in_critical + 1;
// FIXME: Figure out if we need prev_irq_level, see duplicated code in Kernel/Arch/x86/common/Processor.cpp
m_in_irq = 0;
// Process the deferred call queue. Among other things, this ensures
// that any pending thread unblocks happen before we enter the scheduler.
m_deferred_call_pool.execute_pending();
auto* current_thread = Processor::current_thread();
if (current_thread) {
auto& current_trap = current_thread->current_trap();
current_trap = trap.next_trap;
ExecutionMode new_previous_mode;
if (current_trap) {
VERIFY(current_trap->regs);
new_previous_mode = current_trap->regs->previous_mode();
} else {
// If we don't have a higher level trap then we're back in user mode.
// Which means that the previous mode prior to being back in user mode was kernel mode
new_previous_mode = ExecutionMode::Kernel;
}
if (current_thread->set_previous_mode(new_previous_mode))
current_thread->update_time_scheduled(TimeManagement::scheduler_current_time(), true, false);
}
VERIFY_INTERRUPTS_DISABLED();
// Leave the critical section without actually enabling interrupts.
// We don't want context switches to happen until we're explicitly
// triggering a switch in check_invoke_scheduler.
m_in_critical = m_in_critical - 1;
if (!m_in_irq && !m_in_critical)
check_invoke_scheduler();
}
template<typename T>