IntelFrameworkPkg/Include/Protocol/CpuIo.h

   1 /** @file
   2   This code abstracts the CPU IO Protocol which installed by some platform or chipset-specific
   3   PEIM that abstracts the processor-visible I/O operations.
   4
   5   Note: This is a runtime protocol and can be used by runtime drivers after ExitBootServices().
   6   It is different from the PI 1.2 CPU I/O 2 Protocol, which is a boot services only protocol
   7   and may not be used by runtime drivers after ExitBootServices().
   8
   9   Copyright (c) 2007 - 2009, Intel Corporation
  10   All rights reserved. This program and the accompanying materials
  11   are licensed and made available under the terms and conditions of the BSD License
  12   which accompanies this distribution.  The full text of the license may be found at
  13   http://opensource.org/licenses/bsd-license.php
  14
  15   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  16   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  17
  18   @par Revision Reference:
  19   CPU IO Protocol is defined in Framework of EFI CPU IO Protocol Spec
  20   Version 0.9
  21
  22 **/
  23
  24 #ifndef _CPUIO_H_
  25 #define _CPUIO_H_
  26
  27 #include <Protocol/CpuIo2.h>
  28
  29 #define EFI_CPU_IO_PROTOCOL_GUID \
  30   { \
  31     0xB0732526, 0x38C8, 0x4b40, {0x88, 0x77, 0x61, 0xC7, 0xB0, 0x6A, 0xAC, 0x45 } \
  32   }
  33
  34 //
  35 // Framework CPU IO protocol structure is the same as CPU IO 2 protocol defined in PI 1.2 spec.
  36 // However, there is a significant different between the Framework CPU I/O
  37 // Protocol and the PI 1.2 CPU I/O 2 Protocol.  The Framework one is a runtime
  38 // protocol, which means it can be used by runtime drivers after ExitBootServices().
  39 // The PI one is not runtime safe, so it is a boot services only protocol and may
  40 // not be used by runtime drivers after ExitBootServices().
  41 //
  42 typedef EFI_CPU_IO2_PROTOCOL EFI_CPU_IO_PROTOCOL;
  43
  44 extern EFI_GUID gEfiCpuIoProtocolGuid;
  45
  46 #endif