From d45bf363f110fa9a94b87908c0634c8f6b56db17 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Thu, 28 Sep 2023 12:30:27 +0300
Subject: [PATCH] Kernel: Enter ACPI mode with lai

---
 kernel/include/kernel/InterruptController.h |  5 +++++
 kernel/include/kernel/Thread.h              |  2 +-
 kernel/kernel/InterruptController.cpp       | 23 ++++++++++++++++++---
 kernel/kernel/kernel.cpp                    |  2 ++
 4 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/kernel/include/kernel/InterruptController.h b/kernel/include/kernel/InterruptController.h
index 40514f0db2..b2a160ec68 100644
--- a/kernel/include/kernel/InterruptController.h
+++ b/kernel/include/kernel/InterruptController.h
@@ -16,6 +16,11 @@ public:
 
 	static void initialize(bool force_pic);
 	static InterruptController& get();
+
+	void enter_acpi_mode();
+
+private:
+	bool m_using_apic { false };
 };
 
 bool interrupts_enabled();
\ No newline at end of file
diff --git a/kernel/include/kernel/Thread.h b/kernel/include/kernel/Thread.h
index c4115098e3..c6a0b5b440 100644
--- a/kernel/include/kernel/Thread.h
+++ b/kernel/include/kernel/Thread.h
@@ -94,7 +94,7 @@ namespace Kernel
 		void validate_stack() const;
 
 	private:
-		static constexpr size_t		m_kernel_stack_size		= PAGE_SIZE * 1;
+		static constexpr size_t		m_kernel_stack_size		= PAGE_SIZE * 4;
 		static constexpr size_t		m_userspace_stack_size	= PAGE_SIZE * 2;
 		static constexpr size_t		m_interrupt_stack_size	= PAGE_SIZE * 2;
 		BAN::UniqPtr<VirtualRange>	m_interrupt_stack;
diff --git a/kernel/kernel/InterruptController.cpp b/kernel/kernel/InterruptController.cpp
index 7dc1206a95..45fd79a4b9 100644
--- a/kernel/kernel/InterruptController.cpp
+++ b/kernel/kernel/InterruptController.cpp
@@ -3,6 +3,8 @@
 #include <kernel/APIC.h>
 #include <kernel/PIC.h>
 
+#include <lai/helpers/sci.h>
+
 static InterruptController* s_instance = nullptr;
 
 InterruptController& InterruptController::get()
@@ -19,11 +21,26 @@ void InterruptController::initialize(bool force_pic)
 	PIC::remap();
 
 	if (!force_pic)
+	{
 		s_instance = APIC::create();
-	if (s_instance)
-		return;
+		if (s_instance)
+		{
+			s_instance->m_using_apic = true;
+			return;
+		}
+	}
+
 	dprintln("Using PIC instead of APIC");
 	s_instance = PIC::create();
+	ASSERT(s_instance);
+
+	s_instance->m_using_apic = false;
+}
+
+void InterruptController::enter_acpi_mode()
+{
+	if (lai_enable_acpi(m_using_apic ? 1 : 0) != 0)
+		dwarnln("could not enter acpi mode");
 }
 
 bool interrupts_enabled()
@@ -31,4 +48,4 @@ bool interrupts_enabled()
 	uintptr_t flags;
 	asm volatile("pushf; pop %0" : "=r"(flags) :: "memory");
 	return flags & (1 << 9);
-}
\ No newline at end of file
+}
diff --git a/kernel/kernel/kernel.cpp b/kernel/kernel/kernel.cpp
index da9e39650b..633d0ecc50 100644
--- a/kernel/kernel/kernel.cpp
+++ b/kernel/kernel/kernel.cpp
@@ -161,6 +161,8 @@ static void init2(void*)
 
 	dprintln("Scheduler started");
 
+	InterruptController::get().enter_acpi_mode();
+
 	auto console = MUST(DevFileSystem::get().root_inode()->find_inode(cmdline.console));
 	ASSERT(console->is_tty());
 	((TTY*)console.ptr())->set_as_current();