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 - 2018, Intel Corporation. All rights reserved.<BR>
  10 SPDX-License-Identifier: BSD-2-Clause-Patent
  11
  12   @par Revision Reference:
  13   CPU IO Protocol is defined in Framework of EFI CPU IO Protocol Spec
  14   Version 0.9.
  15
  16 **/
  17
  18 #ifndef _CPUIO_H_
  19 #define _CPUIO_H_
  20
  21 #include <Protocol/CpuIo2.h>
  22
  23 #define EFI_CPU_IO_PROTOCOL_GUID \
  24   { \
  25     0xB0732526, 0x38C8, 0x4b40, {0x88, 0x77, 0x61, 0xC7, 0xB0, 0x6A, 0xAC, 0x45 } \
  26   }
  27
  28 //
  29 // Framework CPU IO protocol structure is the same as CPU IO 2 protocol defined in PI 1.2 spec.
  30 // However, there is a significant different between the Framework CPU I/O
  31 // Protocol and the PI 1.2 CPU I/O 2 Protocol.  The Framework one is a runtime
  32 // protocol, which means it can be used by runtime drivers after ExitBootServices().
  33 // The PI one is not runtime safe, so it is a boot services only protocol and may
  34 // not be used by runtime drivers after ExitBootServices().
  35 //
  36 typedef EFI_CPU_IO2_PROTOCOL EFI_CPU_IO_PROTOCOL;
  37
  38 extern EFI_GUID gEfiCpuIoProtocolGuid;
  39
  40 #endif