diff --git a/hw/xfree86/os-support/bus/Pci.c b/hw/xfree86/os-support/bus/Pci.c
index 71c5b2b3b..4e71eb614 100644
--- a/hw/xfree86/os-support/bus/Pci.c
+++ b/hw/xfree86/os-support/bus/Pci.c
@@ -319,14 +319,24 @@ pciReadWord(PCITAG tag, int offset)
   CARD32 tmp;
   int    shift = (offset & 3) * 8;
   int    aligned_offset = offset & ~3;
+  int	 bus = PCI_BUS_FROM_TAG(tag);
 
   if (shift != 0 && shift != 16)
 	  FatalError("pciReadWord: Alignment error: Cannot read 16 bits "
 		     "at offset %d\n", offset);
 
-  tmp = pciReadLong(tag, aligned_offset);
+  pciInit();
 
-  return((CARD16)((tmp >> shift) & 0xffff));
+  if ((bus >= 0) && ((bus < pciNumBuses) || inProbe) && pciBusInfo[bus] &&
+	pciBusInfo[bus]->funcs->pciReadWord) {
+    CARD32 rv = (*pciBusInfo[bus]->funcs->pciReadWord)(tag, offset);
+
+    return(rv);
+  } else {
+    tmp = pciReadLong(tag, aligned_offset);
+
+    return((CARD16)((tmp >> shift) & 0xffff));
+  }
 }
 
 CARD8
@@ -335,10 +345,20 @@ pciReadByte(PCITAG tag, int offset)
   CARD32 tmp;
   int    shift = (offset & 3) * 8;
   int    aligned_offset = offset & ~3;
+  int	 bus = PCI_BUS_FROM_TAG(tag);
 
-  tmp = pciReadLong(tag, aligned_offset);
+  pciInit();
 
-  return((CARD8)((tmp >> shift) & 0xff));
+  if ((bus >= 0) && ((bus < pciNumBuses) || inProbe) && pciBusInfo[bus] &&
+	pciBusInfo[bus]->funcs->pciReadByte) {
+    CARD8 rv = (*pciBusInfo[bus]->funcs->pciReadByte)(tag, offset);
+
+    return(rv);
+  } else {
+    tmp = pciReadLong(tag, aligned_offset);
+
+    return((CARD8)((tmp >> shift) & 0xff));
+  }
 }
 
 void
@@ -359,17 +379,25 @@ pciWriteWord(PCITAG tag, int offset, CARD16 val)
   CARD32 tmp;
   int    aligned_offset = offset & ~3;
   int    shift = (offset & 3) * 8;
+  int	 bus = PCI_BUS_FROM_TAG(tag);
 
   if (shift != 0 && shift != 16)
 	  FatalError("pciWriteWord: Alignment Error: Cannot read 16 bits "
 			"from offset %d\n", offset);
 
-  tmp = pciReadLong(tag, aligned_offset);
+  pciInit();
 
-  tmp &= ~(0xffffL << shift);
-  tmp |= (((CARD32)val) << shift);
+  if ((bus >= 0) && (bus < pciNumBuses) && pciBusInfo[bus] &&
+      pciBusInfo[bus]->funcs->pciWriteWord) {
+    (*pciBusInfo[bus]->funcs->pciWriteWord)(tag, offset, val);
+  } else {
+    tmp = pciReadLong(tag, aligned_offset);
 
-  pciWriteLong(tag, aligned_offset, tmp);
+    tmp &= ~(0xffffL << shift);
+    tmp |= (((CARD32)val) << shift);
+    
+    pciWriteLong(tag, aligned_offset, tmp);
+  }
 }
 
 void
@@ -378,13 +406,22 @@ pciWriteByte(PCITAG tag, int offset, CARD8 val)
   CARD32 tmp;
   int    aligned_offset = offset & ~3;
   int    shift = (offset & 3) *8 ;
+  int	 bus = PCI_BUS_FROM_TAG(tag);
 
-  tmp = pciReadLong(tag, aligned_offset);
+  pciInit();
 
-  tmp &= ~(0xffL << shift);
-  tmp |= (((CARD32)val) << shift);
+  if ((bus >= 0) && (bus < pciNumBuses) && pciBusInfo[bus] &&
+      pciBusInfo[bus]->funcs->pciWriteByte) {
+	  (*pciBusInfo[bus]->funcs->pciWriteByte)(tag, offset, val);
+  } else {
 
-  pciWriteLong(tag, aligned_offset, tmp);
+    tmp = pciReadLong(tag, aligned_offset);
+    
+    tmp &= ~(0xffL << shift);
+    tmp |= (((CARD32)val) << shift);
+    
+    pciWriteLong(tag, aligned_offset, tmp);
+  }
 }
 
 void
diff --git a/hw/xfree86/os-support/bus/Pci.h b/hw/xfree86/os-support/bus/Pci.h
index ee6e9d723..70293d3f4 100644
--- a/hw/xfree86/os-support/bus/Pci.h
+++ b/hw/xfree86/os-support/bus/Pci.h
@@ -194,8 +194,11 @@
 			 ((val >>  8) & 0x0000ff00) |	\
 			 ((val <<  8) & 0x00ff0000) |	\
 			 ((val << 24) & 0xff000000))
+#define PCI_CPU16(val)	(((val >>  8) & 0x000000ff) |	\
+			 ((val <<  8) & 0x0000ff00))
 #else
 #define PCI_CPU(val)	(val)
+#define PCI_CPU16(val)	(val)
 #endif
 
 /*
@@ -382,6 +385,14 @@ typedef struct pci_bus_funcs {
 	void    (*pciGetBridgeBuses)(int, int *, int *, int *);
 	/* Use pointer's to avoid #include recursion */
 	void    (*pciGetBridgeResources)(int, pointer *, pointer *, pointer *);
+
+	/* These are optional and will be implemented using read long
+	 * if not present. */
+	CARD8   (*pciReadByte)(PCITAG, int);
+	void    (*pciWriteByte)(PCITAG, int, CARD8);
+	CARD16  (*pciReadWord)(PCITAG, int);
+	void    (*pciWriteWord)(PCITAG, int, CARD16);
+
 } pciBusFuncs_t, *pciBusFuncs_p;
 
 /*
diff --git a/hw/xfree86/os-support/bus/linuxPci.c b/hw/xfree86/os-support/bus/linuxPci.c
index 1ae8e87b6..40fb4604b 100644
--- a/hw/xfree86/os-support/bus/linuxPci.c
+++ b/hw/xfree86/os-support/bus/linuxPci.c
@@ -69,17 +69,32 @@ static ADDRESS linuxPpcBusAddrToHostAddr(PCITAG, PciAddrType, ADDRESS);
 static ADDRESS linuxPpcHostAddrToBusAddr(PCITAG, PciAddrType, ADDRESS);
 #endif
 
+static CARD8 linuxPciCfgReadByte(PCITAG tag, int off);
+static void linuxPciCfgWriteByte(PCITAG tag, int off, CARD8 val);
+static CARD16 linuxPciCfgReadWord(PCITAG tag, int off);
+static void linuxPciCfgWriteWord(PCITAG tag, int off, CARD16 val);
+
 static pciBusFuncs_t linuxFuncs0 = {
 /* pciReadLong      */	linuxPciCfgRead,
 /* pciWriteLong     */	linuxPciCfgWrite,
 /* pciSetBitsLong   */	linuxPciCfgSetBits,
 #if defined(__powerpc__)
 /* pciAddrHostToBus */	linuxPpcHostAddrToBusAddr,
-/* pciAddrBusToHost */	linuxPpcBusAddrToHostAddr
+/* pciAddrBusToHost */	linuxPpcBusAddrToHostAddr,
 #else
 /* pciAddrHostToBus */	pciAddrNOOP,
-/* pciAddrBusToHost */	linuxTransAddrBusToHost
+/* pciAddrBusToHost */	linuxTransAddrBusToHost,
 #endif
+
+/* pciControlBridge */		NULL,
+/* pciGetBridgeBuses */		NULL,
+/* pciGetBridgeResources */	NULL,
+
+/* pciReadByte */	linuxPciCfgReadByte,
+/* pciWriteByte */	linuxPciCfgWriteByte,
+
+/* pciReadWord */	linuxPciCfgReadWord,
+/* pciWriteWord */	linuxPciCfgWriteWord,
 };
 
 static pciBusInfo_t linuxPci0 = {
@@ -270,6 +285,57 @@ linuxPpcHostAddrToBusAddr(PCITAG tag, PciAddrType type, ADDRESS addr)
 
 #endif /* __powerpc__ */
 
+static CARD8
+linuxPciCfgReadByte(PCITAG tag, int off)
+{
+	int	fd;
+	CARD8	val = 0xff;
+
+	if (-1 != (fd = linuxPciOpenFile(tag,FALSE))) {
+		lseek(fd,off,SEEK_SET);
+		read(fd,&val,1);
+	}
+
+	return val;
+}
+
+static void
+linuxPciCfgWriteByte(PCITAG tag, int off, CARD8 val)
+{
+	int	fd;
+
+	if (-1 != (fd = linuxPciOpenFile(tag,TRUE))) {
+		lseek(fd,off,SEEK_SET);
+		write(fd, &val, 1);
+	}
+}
+
+static CARD16
+linuxPciCfgReadWord(PCITAG tag, int off)
+{
+	int	fd;
+	CARD16	val = 0xff;
+
+	if (-1 != (fd = linuxPciOpenFile(tag,FALSE))) {
+		lseek(fd, off, SEEK_SET);
+		read(fd, &val, 2);
+	}
+
+	return PCI_CPU16(val);
+}
+
+static void
+linuxPciCfgWriteWord(PCITAG tag, int off, CARD16 val)
+{
+	int	fd;
+
+	if (-1 != (fd = linuxPciOpenFile(tag,TRUE))) {
+		lseek(fd, off, SEEK_SET);
+		val = PCI_CPU16(val);
+		write(fd, &val, 2);
+	}
+}
+
 #ifndef INCLUDE_XF86_NO_DOMAIN
 
 /*