ArmPkg/Include/Library/ArmSvcLib.h

   1 /** @file
   2 *
   3 *  Copyright (c) 2016 - 2017, ARM Limited. All rights reserved.
   4 *
   5 *  SPDX-License-Identifier: BSD-2-Clause-Patent
   6 *
   7 **/
   8
   9 #ifndef ARM_SVC_LIB_H_
  10 #define ARM_SVC_LIB_H_
  11
  12 /**
  13  * The size of the SVC arguments are different between AArch64 and AArch32.
  14  * The native size is used for the arguments.
  15  */
  16 typedef struct {
  17   UINTN    Arg0;
  18   UINTN    Arg1;
  19   UINTN    Arg2;
  20   UINTN    Arg3;
  21   UINTN    Arg4;
  22   UINTN    Arg5;
  23   UINTN    Arg6;
  24   UINTN    Arg7;
  25 } ARM_SVC_ARGS;
  26
  27 /**
  28   Trigger an SVC call
  29
  30   SVC calls can take up to 8 arguments and return up to 8 return values.
  31   Therefore, the 8 first fields in the ARM_SVC_ARGS structure are used
  32   for both input and output values.
  33
  34   @param[in, out]    Args Arguments to be passed as part of the SVC call
  35                      The return values of the SVC call are also placed
  36                      in the same structure
  37
  38   @retval None
  39
  40 **/
  41 VOID
  42 ArmCallSvc (
  43   IN OUT ARM_SVC_ARGS  *Args
  44   );
  45
  46 #endif // ARM_SVC_LIB_H_