1 files changed, 83 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Include/IndustryStandard/VirtioBlk.h b/roms/edk2/OvmfPkg/Include/IndustryStandard/VirtioBlk.h
new file mode 100644
index 000000000..23da619d7
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Include/IndustryStandard/VirtioBlk.h
@@ -0,0 +1,83 @@
+/** @file
+
+  Virtio Block Device specific type and macro definitions corresponding to the
+  virtio-0.9.5 specification.
+
+  Copyright (C) 2012, Red Hat, Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef _VIRTIO_BLK_H_
+#define _VIRTIO_BLK_H_
+
+#include <IndustryStandard/Virtio.h>
+
+
+//
+// virtio-0.9.5, Appendix D: Block Device
+//
+#pragma pack(1)
+typedef struct {
+  UINT8  PhysicalBlockExp; // # of logical blocks per physical block (log2)
+  UINT8  AlignmentOffset;  // offset of first aligned logical block
+  UINT16 MinIoSize;        // suggested minimum I/O size in blocks
+  UINT32 OptIoSize;        // optimal (suggested maximum) I/O size in blocks
+} VIRTIO_BLK_TOPOLOGY;
+
+typedef struct {
+  UINT64              Capacity;
+  UINT32              SizeMax;
+  UINT32              SegMax;
+  UINT16              Cylinders;
+  UINT8               Heads;
+  UINT8               Sectors;
+  UINT32              BlkSize;
+  VIRTIO_BLK_TOPOLOGY Topology;
+} VIRTIO_BLK_CONFIG;
+#pragma pack()
+
+#define OFFSET_OF_VBLK(Field) OFFSET_OF (VIRTIO_BLK_CONFIG, Field)
+#define SIZE_OF_VBLK(Field)   (sizeof ((VIRTIO_BLK_CONFIG *) 0)->Field)
+
+#define VIRTIO_BLK_F_BARRIER  BIT0
+#define VIRTIO_BLK_F_SIZE_MAX BIT1
+#define VIRTIO_BLK_F_SEG_MAX  BIT2
+#define VIRTIO_BLK_F_GEOMETRY BIT4
+#define VIRTIO_BLK_F_RO       BIT5
+#define VIRTIO_BLK_F_BLK_SIZE BIT6  // treated as "logical block size" in
+                                    // practice; actual host side
+                                    // implementation negotiates "optimal"
+                                    // block size separately, via
+                                    // VIRTIO_BLK_F_TOPOLOGY
+#define VIRTIO_BLK_F_SCSI     BIT7
+#define VIRTIO_BLK_F_FLUSH    BIT9  // identical to "write cache enabled"
+#define VIRTIO_BLK_F_TOPOLOGY BIT10 // information on optimal I/O alignment
+
+//
+// We keep the status byte separate from the rest of the virtio-blk request
+// header. See description of historical scattering at the end of Appendix D:
+// we're going to put the status byte in a separate VRING_DESC.
+//
+#pragma pack(1)
+typedef struct {
+  UINT32 Type;
+  UINT32 IoPrio;
+  UINT64 Sector;
+} VIRTIO_BLK_REQ;
+#pragma pack()
+
+#define VIRTIO_BLK_T_IN           0x00000000
+#define VIRTIO_BLK_T_OUT          0x00000001
+#define VIRTIO_BLK_T_SCSI_CMD     0x00000002
+#define VIRTIO_BLK_T_SCSI_CMD_OUT 0x00000003
+#define VIRTIO_BLK_T_FLUSH        0x00000004
+#define VIRTIO_BLK_T_FLUSH_OUT    0x00000005
+#define VIRTIO_BLK_T_BARRIER      BIT31
+
+#define VIRTIO_BLK_S_OK           0x00
+#define VIRTIO_BLK_S_IOERR        0x01
+#define VIRTIO_BLK_S_UNSUPP       0x02
+
+#endif // _VIRTIO_BLK_H_