OvmfPkg/Include/Protocol/XenBus.h

   1
   2 /** @file
   3   XenBus protocol to be used between the XenBus bus driver and Xen PV devices.
   4
   5   DISCLAIMER: the XENBUS_PROTOCOL introduced here is a work in progress, and
   6   should not be used outside of the EDK II tree.
   7
   8   This protocol provide the necessary for a Xen PV driver frontend to
   9   communicate with the bus driver, and perform several task to
  10   initialize/shutdown a PV device and perform IO with a PV backend.
  11
  12   Copyright (C) 2014, Citrix Ltd.
  13
  14   This program and the accompanying materials
  15   are licensed and made available under the terms and conditions of the BSD License
  16   which accompanies this distribution.  The full text of the license may be found at
  17   http://opensource.org/licenses/bsd-license.php
  18
  19   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  20   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  21
  22 **/
  23
  24 #ifndef __PROTOCOL_XENBUS_H__
  25 #define __PROTOCOL_XENBUS_H__
  26
  27 #define XENBUS_PROTOCOL_GUID \
  28   {0x3d3ca290, 0xb9a5, 0x11e3, {0xb7, 0x5d, 0xb8, 0xac, 0x6f, 0x7d, 0x65, 0xe6}}
  29
  30 ///
  31 /// Forward declaration
  32 ///
  33 typedef struct _XENBUS_PROTOCOL XENBUS_PROTOCOL;
  34
  35
  36 #include <IndustryStandard/Xen/grant_table.h>
  37
  38 ///
  39 /// Function prototypes
  40 ///
  41
  42 /**
  43   Grant access to the page Frame to the domain DomainId.
  44
  45   @param This       A pointer to XENBUS_PROTOCOL instance.
  46   @param DomainId   ID of the domain to grant acces to.
  47   @param Frame      Frame Number of the page to grant access to.
  48   @param ReadOnly   Provide read-only or read-write access.
  49   @param RefPtr     Reference number of the grant will be writen to this pointer.
  50 **/
  51 typedef
  52 EFI_STATUS
  53 (EFIAPI *XENBUS_GRANT_ACCESS)(
  54   IN  XENBUS_PROTOCOL *This,
  55   IN  domid_t         DomainId,
  56   IN  UINTN           Frame,
  57   IN  BOOLEAN         ReadOnly,
  58   OUT grant_ref_t     *refp
  59   );
  60
  61 /**
  62   End access to grant Ref, previously return by XenBusGrantAccess.
  63
  64   @param This       A pointer to XENBUS_PROTOCOL instance.
  65   @param Ref        Reference numeber of a grant previously returned by
  66                     XenBusGrantAccess.
  67 **/
  68 typedef
  69 EFI_STATUS
  70 (EFIAPI *XENBUS_GRANT_END_ACCESS)(
  71   IN XENBUS_PROTOCOL  *This,
  72   IN grant_ref_t      Ref
  73   );
  74
  75
  76 ///
  77 /// Protocol structure
  78 ///
  79 /// DISCLAIMER: the XENBUS_PROTOCOL introduced here is a work in progress, and
  80 /// should not be used outside of the EDK II tree.
  81 ///
  82 struct _XENBUS_PROTOCOL {
  83   XENBUS_GRANT_ACCESS           GrantAccess;
  84   XENBUS_GRANT_END_ACCESS       GrantEndAccess;
  85   //
  86   // Protocol data fields
  87   //
  88 };
  89
  90 extern EFI_GUID gXenBusProtocolGuid;
  91
  92 #endif