OVMF: Add Block MMIO protocol definition

This protocol is similar to the standard UEFI BlockIo protocol,
except it has no function calls and simply defines a base address
in memory where reads & writes for the block device should occur.

One planned usage is to fill a memory region with a small disk
image, and allow it to be used as a normal disk by the
standard drivers.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10295 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/Include/Protocol/BlockMmio.h

@@ -0,0 +1,50 @@
+/** @file
+  Block IO (memory mapped)
+
+  Copyright (c) 2006 - 2010, Intel Corporation                                                         
+  All rights reserved. This program and the accompanying materials                          
+  are licensed and made available under the terms and conditions of the BSD License         
+  which accompanies this distribution.  The full text of the license may be found at        
+  http://opensource.org/licenses/bsd-license.php                                            
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             
+
+**/
+
+#ifndef __BLOCK_MMIO_H__
+#define __BLOCK_MMIO_H__
+
+#include <Protocol/BlockIo.h>
+
+#define BLOCK_MMIO_PROTOCOL_GUID \
+  { \
+    0x6b558ce3, 0x69e5, 0x4c67, {0xa6, 0x34, 0xf7, 0xfe, 0x72, 0xad, 0xbe, 0x84 } \
+  }
+
+typedef struct _BLOCK_MMIO_PROTOCOL  BLOCK_MMIO_PROTOCOL;
+
+
+///
+///  This protocol provides control over block devices.
+///
+struct _BLOCK_MMIO_PROTOCOL {
+  ///
+  /// The revision to which the block IO interface adheres. All future
+  /// revisions must be backwards compatible. If a future version is not
+  /// back wards compatible, it is not the same GUID.
+  ///
+  UINT64                Revision;
+  ///
+  /// Pointer to the EFI_BLOCK_IO_MEDIA data for this device.
+  ///
+  EFI_BLOCK_IO_MEDIA    *Media;
+
+  EFI_PHYSICAL_ADDRESS  BaseAddress;
+
+};
+
+extern EFI_GUID gBlockMmioProtocolGuid;
+
+#endif
+

OvmfPkg/OvmfPkg.dec

@@ -25,6 +25,9 @@
 [Guids]
   gUefiOvmfPkgTokenSpaceGuid      = {0x93bb96af, 0xb9f2, 0x4eb8, {0x94, 0x62, 0xe0, 0xba, 0x74, 0x56, 0x42, 0x36}}
 
+[Protocols]
+  gBlockMmioProtocolGuid          = {0x6b558ce3, 0x69e5, 0x4c67, {0xa6, 0x34, 0xf7, 0xfe, 0x72, 0xad, 0xbe, 0x84}}
+
 [PcdsFixedAtBuild]
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfMemFvBase|0x0|UINT32|0
   gUefiOvmfPkgTokenSpaceGuid.PcdOvmfMemFvSize|0x0|UINT32|0