1. Changed device detect method to use ATA/ATAPI device signature;

2. Enhancements to better support SATA CDROM;
3. Fixed UDMA operation for buffer above 4G memory issue;
4. Fixed maximal block setting for ATAPI read sector operation to comply with spec;
5. Some minor fixes.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1739 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Bus/Pci/IdeBus/Dxe/idebus.h

@@ -28,6 +28,10 @@
 #define MAX_IDE_CHANNELS  2
 #define MAX_IDE_DRIVES    2
 
+#define INVALID_DEVICE_TYPE 0xff
+#define ATA_DEVICE_TYPE     0x00
+#define ATAPI_DEVICE_TYPE   0x01
+
 typedef struct {
   BOOLEAN HaveScannedDevice[MAX_IDE_DEVICE];
   BOOLEAN DeviceFound[MAX_IDE_DEVICE];
@@ -67,6 +71,11 @@ typedef struct {
   UINT8                       SenseDataNumber;
   UINT8                       *Cache;
 
+  //
+  // ExitBootService Event, it is used to clear pending IDE interrupt
+  //
+  EFI_EVENT                   ExitBootServiceEvent;
+
   EFI_UNICODE_STRING_TABLE    *ControllerNameTable;
 } IDE_BLK_IO_DEV;