Kernel: Add basic PCI enumeration

kernel/include/kernel/PCI.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <BAN/Vector.h>
+
+namespace Kernel
+{
+
+	class PCIDevice
+	{
+	public:
+		const uint8_t bus;
+		const uint8_t dev;
+		const uint8_t func;
+
+		const uint8_t class_code;
+		const uint8_t subclass;
+
+		uint32_t read_dword(uint8_t) const;
+		uint16_t read_word(uint8_t) const;
+		uint8_t  read_byte(uint8_t) const;
+	};
+
+	class PCI
+	{
+	public:
+		static bool initialize();
+		static PCI& get();
+		
+		const BAN::Vector<PCIDevice>& devices() const { return m_devices; }
+
+	private:
+		PCI() = default;
+		void check_function(uint8_t bus, uint8_t dev, uint8_t func);
+		void check_device(uint8_t bus, uint8_t dev);
+		void check_bus(uint8_t bus);
+		void check_all_buses();
+
+	private:
+		BAN::Vector<PCIDevice> m_devices;
+	};
+
+}