diff --git a/include/io/pci.h b/include/io/pci.h
index 40470d1..239fead 100644
--- a/include/io/pci.h
+++ b/include/io/pci.h
@@ -35,31 +35,46 @@
 //
 // Device registers offsets
 //
-#define PCI_REG_VENDOR      0
-#define PCI_REG_DEVICE      2
-#define PCI_REG_COMMAND     4
-#define PCI_REG_STATUS      6
+#define PCI_REG_VENDOR          0
+#define PCI_REG_DEVICE          2
+#define PCI_REG_COMMAND         4
+#define PCI_REG_STATUS          6
 //..
-#define PCI_REG_BAR0        0x10
-#define PCI_REG_BAR1        0x14
+#define PCI_REG_BAR0            0x10
+#define PCI_REG_BAR1            0x14
+#define PCI_REG_BAR2            0x18
+#define PCI_REG_BAR3            0x1C
+#define PCI_REG_BAR4            0x20
+#define PCI_REG_BAR5            0x24
+//..
+#define PCI_REG_INTERRUPT_LINE  0x3C
 //..
 
 
 //----------------------------------------------------------------------------//
 
 
-typedef struct {
+struct PciDev_t {
     ushort vendorID;
     ushort deviceID;
     void* configAddr;
-} pciDev_t;
+};
 
 
 //----------------------------------------------------------------------------//
 
 void IoInitPCI();
 void IoPciEnumerate();
-pciDev_t *IoPciGetDevice(ushort vendorID, ushort deviceID);
+PciDev_t *IoPciGetDevice(ushort vendorID, ushort deviceID);
+
+uchar IoPciReadConfigByte(PciDev_t *device, ushort offset);
+ushort IoPciReadConfigWord(PciDev_t *device, ushort offset);
+uint IoPciReadConfigDWord(PciDev_t *device, ushort offset);
+
+
+void IoPciWriteConfigByte(PciDev_t *device, ushort offset, uchar data);
+void IoPciWriteConfigWord(PciDev_t *device, ushort offset, ushort data);
+void IoPciWriteConfigDWord(PciDev_t *device, ushort offset, uint data);
 
 
 #endif
diff --git a/include/kernel.h b/include/kernel.h
index 23c90a2..09084d9 100644
--- a/include/kernel.h
+++ b/include/kernel.h
@@ -67,6 +67,8 @@ typedef struct GdtPtr_t             GdtPtr_t;
 typedef struct Tss_t                Tss_t;
 typedef struct TssDescriptor_t      TssDescriptor_t;
 
+typedef struct PciDev_t             PciDev_t;
+
 //----------------------------------------------------------------------------//
 
 //
diff --git a/kaleid/kernel/io/pci.c b/kaleid/kernel/io/pci.c
index 955e818..6e05afd 100644
--- a/kaleid/kernel/io/pci.c
+++ b/kaleid/kernel/io/pci.c
@@ -68,6 +68,44 @@ static inline uint pciReadConfigDWord(uchar bus, uchar device,
     return *((uint*)(pciGetConfigAddr(bus, device, function, offset)));
 }
 
+
+//----------------------------------------------------------------------------//
+
+uchar IoPciReadConfigByte(PciDev_t *device, ushort offset)
+{
+    return *((uchar *)((ulong)device->configAddr + offset));
+}
+
+ushort IoPciReadConfigWord(PciDev_t *device, ushort offset)
+{
+    return *((ushort *)((ulong)device->configAddr + offset));
+}
+
+uint IoPciReadConfigDWord(PciDev_t *device, ushort offset)
+{
+    return *((uint *)((ulong)device->configAddr + offset));
+}
+
+
+void IoPciWriteConfigByte(PciDev_t *device, ushort offset, uchar data)
+{
+    memmove((void *)((ulong)device->configAddr + offset), &data, 1);
+}
+
+
+void IoPciWriteConfigWord(PciDev_t *device, ushort offset, ushort data)
+{
+    memmove((void *)((ulong)device->configAddr + offset), &data, 2);
+}
+
+
+void IoPciWriteConfigDWord(PciDev_t *device, ushort offset, uint data)
+{
+    memmove((void *)((ulong)device->configAddr + offset), &data, 4);
+}
+
+
+
 void IoPciEnumerate()
 {
     if(pciConfigBaseAddress == NULL) {
@@ -89,7 +127,7 @@ void IoPciEnumerate()
     }
 }
 
-pciDev_t *IoPciGetDevice(ushort vendorID, ushort deviceID)
+PciDev_t *IoPciGetDevice(ushort vendorID, ushort deviceID)
 {
     if(pciConfigBaseAddress == NULL) {
         KernLog("Unable to access PCI configuration : MCFG table not reachable\n");
@@ -101,7 +139,7 @@ pciDev_t *IoPciGetDevice(ushort vendorID, ushort deviceID)
             for(uchar function = 0; function < 8; function++) {
                 if(vendorID == pciReadConfigWord((uchar)bus, device, function, PCI_REG_VENDOR) 
                     && deviceID == pciReadConfigWord((uchar)bus, device, function, PCI_REG_DEVICE)) {
-                    pciDev_t *pciDevicePtr = (pciDev_t *)malloc(sizeof(pciDev_t));
+                    PciDev_t *pciDevicePtr = (PciDev_t *)malloc(sizeof(PciDev_t));
                     pciDevicePtr->vendorID = vendorID;
                     pciDevicePtr->deviceID = deviceID;
                     pciDevicePtr->configAddr = pciGetConfigAddr((uchar)bus, device, function, 0);
@@ -123,6 +161,14 @@ void IoInitPCI()
     DebugLog("PCI Config Base address = 0x%p\n", pciConfigBaseAddress);
     
     IoPciEnumerate();
+    
+    // Give R/W access to the configuration space
+    for(int i=0; i < 65536; i++) // 65536 = 256 * 32 * 8
+    {
+        // 4096 for page size TODO: use of KPAGESIZE
+        MmMapPage((void *)((ulong)pciConfigBaseAddress + i * 4096), 
+                  (void *)((ulong)pciConfigBaseAddress + i * 4096), PRESENT | READWRITE);
+    }
 }