1 files changed, 81 insertions, 0 deletions
diff --git a/dev/kernel/KernelKit/PCI/Device.h b/dev/kernel/KernelKit/PCI/Device.h
new file mode 100644
index 00000000..9870f618
--- /dev/null
+++ b/dev/kernel/KernelKit/PCI/Device.h
@@ -0,0 +1,81 @@
+/* -------------------------------------------
+
+	Copyright (C) 2024-2025, Amlal EL Mahrouss, all rights reserved.
+
+------------------------------------------- */
+#pragma once
+
+#include <NewKit/Defines.h>
+
+namespace NeOS::PCI
+{
+	enum class PciConfigKind : UShort
+	{
+		ConfigAddress = 0xCF8,
+		ConfigData	  = 0xCFC,
+		CommandReg	  = 0x0004,
+		Invalid		  = 0xFFFF,
+	};
+
+	class Device final
+	{
+	public:
+		Device() = default;
+
+	public:
+		explicit Device(UShort bus, UShort device, UShort function, UInt32 bar);
+
+		Device& operator=(const Device&) = default;
+
+		Device(const Device&) = default;
+
+		~Device();
+
+	public:
+		UInt Read(UInt bar, Size szData);
+		void Write(UInt bar, UIntPtr data, Size szData);
+
+	public:
+		operator bool();
+
+	public:
+		template <typename T>
+		UInt Read(UInt bar)
+		{
+			static_assert(sizeof(T) <= 4, "64-bit PCI addressing is unsupported");
+			return Read(bar, sizeof(T));
+		}
+
+		template <typename T>
+		void Write(UInt bar, UIntPtr data)
+		{
+			static_assert(sizeof(T) <= 4, "64-bit PCI addressing is unsupported");
+			Write(bar, data, sizeof(T));
+		}
+
+	public:
+		UShort	DeviceId();
+		UShort	VendorId();
+		UShort	InterfaceId();
+		UChar	Class();
+		UChar	Subclass();
+		UChar	ProgIf();
+		UChar	HeaderType();
+		UIntPtr Bar(UInt32 bar_in);
+
+	public:
+		void EnableMmio(UInt32 bar_in);
+		void BecomeBusMaster(UInt32 bar_in); // for PCI-DMA, PC-DMA does not need that.
+
+		UShort Vendor();
+
+	private:
+		UShort fBus;
+		UShort fDevice;
+		UShort fFunction;
+		UInt32 fBar;
+	};
+} // namespace NeOS::PCI
+
+EXTERN_C void NewOSPCISetCfgTarget(NeOS::UInt bar);
+EXTERN_C NeOS::UInt NewOSPCIReadRaw(NeOS::UInt bar);