diff --git a/src/system/pci/pci.h b/src/system/pci/pci.h
index 2a82056..565c414 100644
--- a/src/system/pci/pci.h
+++ b/src/system/pci/pci.h
@@ -1,4 +1,32 @@
 #ifndef __PCI_H__
 #define __PCI_H__
 
+#include <stdlib.h>
+#include <printf.h>
+#include <stdint.h>
+
+typedef struct device_descriptor
+{
+    uint32_t portBase;
+    uint32_t interrupt;
+
+    uint16_t bus;
+    uint16_t device;
+    uint16_t function;
+
+    uint16_t vendor_id;
+    uint16_t device_id;
+
+    uint8_t class_id;
+    uint8_t subclass_id;
+    uint8_t interface_id;
+
+    uint8_t revision;
+} device_descriptor;
+
+uint32_t read_pci(uint16_t bus, uint16_t device, uint16_t function, uint32_t regoffset);
+void write_pci(uint16_t bus, uint16_t device, uint16_t function, uint32_t regoffset, uint32_t data);
+void register_pci();
+device_descriptor get_device_descriptor(uint16_t bus, uint16_t device, uint16_t function);
+
 #endif // __PCI_H__
\ No newline at end of file