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Kernel: Optimize sse saving/loading

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Only save and load sse when new thread is trying to execute sse
instruction. There is no need to do that every time we enter kernel.
This commit is contained in:
Bananymous
2024-01-03 02:06:49 +02:00
parent db0650cf10
commit 001e95f973
5 changed files with 61 additions and 27 deletions
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33
kernel/arch/x86_64/IDT.cpp
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@@ -218,6 +218,23 @@ namespace Kernel::IDT
}
}
}
#if __enable_sse
else if (isr == ISR::DeviceNotAvailable)
{
asm volatile(
"movq %cr0, %rax;"
"andq $~(1 << 3), %rax;"
"movq %rax, %cr0;"
);
if (auto* current = &Thread::current(); current != Thread::sse_thread())
{
if (auto* sse = Thread::sse_thread())
sse->save_sse();
current->load_sse();
}
goto done;
}
#endif
}
if (PageTable::current().get_page_flags(interrupt_stack.rip & PAGE_ADDR_MASK) & PageTable::Flags::Present)
@@ -259,7 +276,6 @@ namespace Kernel::IDT
int signal = 0;
switch (isr)
{
case ISR::DeviceNotAvailable:
case ISR::DivisionError:
case ISR::SIMDFloatingPointException:
case ISR::x87FloatingPointException:
@@ -290,22 +306,11 @@ namespace Kernel::IDT
ASSERT(Thread::current().state() != Thread::State::Terminated);
done:
#if __enable_sse
if (from_userspace)
{
ASSERT(Thread::current().state() == Thread::State::Executing);
Thread::current().load_sse();
}
#endif
return;
}
extern "C" void cpp_irq_handler(uint64_t irq, InterruptStack& interrupt_stack)
{
#if __enable_sse
Thread::current().save_sse();
#endif
if (Scheduler::current_tid())
{
Thread::current().set_return_rsp(interrupt_stack.rsp);
@@ -326,10 +331,6 @@ done:
Scheduler::get().reschedule_if_idling();
ASSERT(Thread::current().state() != Thread::State::Terminated);
#if __enable_sse
Thread::current().load_sse();
#endif
}
static void flush_idt()