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Kernel/LibC: add flag to enable/disable sse support

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SSE support is very experimental and causes GP. I decided to make
SSE not default until I get to fixing it :)
This commit is contained in:
Bananymous
2023-09-23 02:28:25 +03:00
parent 6bb2c80bdd
commit 7a7c5e433e
5 changed files with 24 additions and 2 deletions
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10
kernel/arch/x86_64/IDT.cpp
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@@ -139,10 +139,11 @@ namespace IDT
extern "C" void cpp_isr_handler(uint64_t isr, uint64_t error, Kernel::InterruptStack& interrupt_stack, const Registers* regs)
{
#if __enable_sse
bool from_userspace = (interrupt_stack.cs & 0b11) == 0b11;
if (from_userspace)
Kernel::Thread::current().save_sse();
#endif
pid_t tid = Kernel::Scheduler::current_tid();
pid_t pid = tid ? Kernel::Process::current().pid() : 0;
@@ -205,19 +206,22 @@ namespace IDT
ASSERT(Kernel::Thread::current().state() != Kernel::Thread::State::Terminated);
#if __enable_sse
if (from_userspace)
{
ASSERT(Kernel::Thread::current().state() == Kernel::Thread::State::Executing);
Kernel::Thread::current().load_sse();
}
#endif
}
extern "C" void cpp_irq_handler(uint64_t irq, Kernel::InterruptStack& interrupt_stack)
{
#if __enable_sse
bool from_userspace = (interrupt_stack.cs & 0b11) == 0b11;
if (from_userspace)
Kernel::Thread::current().save_sse();
#endif
if (Kernel::Scheduler::current_tid())
{
@@ -240,11 +244,13 @@ namespace IDT
ASSERT(Kernel::Thread::current().state() != Kernel::Thread::State::Terminated);
#if __enable_sse
if (from_userspace)
{
ASSERT(Kernel::Thread::current().state() == Kernel::Thread::State::Executing);
Kernel::Thread::current().load_sse();
}
#endif
}
static void flush_idt()

4
kernel/include/kernel/Thread.h
View File

@@ -82,8 +82,10 @@ namespace Kernel
bool is_userspace() const { return m_is_userspace; }
#if __enable_sse
void save_sse() { asm volatile("fxsave %0" :: "m"(m_sse_storage)); }
void load_sse() { asm volatile("fxrstor %0" :: "m"(m_sse_storage)); }
#endif
private:
Thread(pid_t tid, Process*);
@@ -114,7 +116,9 @@ namespace Kernel
uint64_t m_terminate_blockers { 0 };
#if __enable_sse
alignas(16) uint8_t m_sse_storage[512] {};
#endif
friend class Scheduler;
};

5
kernel/kernel/Syscall.cpp
View File

@@ -32,7 +32,9 @@ namespace Kernel
return 0;
}
#if __enable_sse
Thread::current().save_sse();
#endif
asm volatile("sti");
@@ -205,7 +207,10 @@ namespace Kernel
Kernel::panic("Kernel error while returning to userspace {}", ret.error());
ASSERT(Kernel::Thread::current().state() == Kernel::Thread::State::Executing);
#if __enable_sse
Thread::current().load_sse();
#endif
if (ret.is_error())
return -ret.error().get_error_code();