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Kernel/riscv64: Implement enter_thread_context

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This code is based on the aarch64 implementation.
This commit is contained in:
Sönke Holz 2024-02-15 16:37:00 +01:00 committed by Andrew Kaster
parent 2f33e7a964
commit 7fbcceb657
Notes: sideshowbarker 2024-07-17 05:01:20 +09:00 
Author: https://github.com/spholz
Commit: https://github.com/SerenityOS/serenity/commit/7fbcceb657
Pull-request: https://github.com/SerenityOS/serenity/pull/23113
Reviewed-by: https://github.com/ADKaster ✅
2 changed files with 34 additions and 1 deletions
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5
Kernel/Arch/riscv64/CSR.h
View file

@ -93,6 +93,11 @@ struct [[gnu::packed]] alignas(u64) SATP {
{
return bit_cast<SATP>(CSR::read(CSR::Address::SATP));
}
bool operator==(SATP const& other) const
{
return bit_cast<u64>(*this) == bit_cast<u64>(other);
}
};
static_assert(AssertSize<SATP, 8>());

30
Kernel/Arch/riscv64/Processor.cpp
View file

@ -58,7 +58,7 @@ static void store_fpu_state(FPUState* fpu_state)
: "t0", "memory");
}
[[maybe_unused]] static void load_fpu_state(FPUState* fpu_state)
static void load_fpu_state(FPUState* fpu_state)
{
asm volatile(
"fld f0, 0*8(%0) \n"
@ -276,6 +276,34 @@ ErrorOr<Vector<FlatPtr, 32>> ProcessorBase<T>::capture_stack_trace(Thread&, size
return Vector<FlatPtr, 32> {};
}
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread);
extern "C" void enter_thread_context(Thread* from_thread, Thread* to_thread)
{
VERIFY(from_thread == to_thread || from_thread->state() != Thread::State::Running);
VERIFY(to_thread->state() == Thread::State::Running);
Processor::set_current_thread(*to_thread);
store_fpu_state(&from_thread->fpu_state());
auto& from_regs = from_thread->regs();
auto& to_regs = to_thread->regs();
if (from_regs.satp != to_regs.satp) {
RISCV64::CSR::SATP::write(to_regs.satp);
Processor::flush_entire_tlb_local();
}
to_thread->set_cpu(Processor::current().id());
Processor::set_thread_specific_data(to_thread->thread_specific_data());
auto in_critical = to_thread->saved_critical();
VERIFY(in_critical > 0);
Processor::restore_critical(in_critical);
load_fpu_state(&to_thread->fpu_state());
}
NAKED void thread_context_first_enter(void)
{
asm("unimp");