MdePkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / Monitor.c

/** @file\r
  AsmMonitor function\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
/**\r
  Sets up a monitor buffer that is used by AsmMwait().\r
\r
  Executes a MONITOR instruction with the register state specified by Eax, Ecx\r
  and Edx. Returns Eax. This function is only available on IA-32 and x64.\r
\r
  @param  RegisterEax The value to load into EAX or RAX before executing the MONITOR\r
                      instruction.\r
  @param  RegisterEcx The value to load into ECX or RCX before executing the MONITOR\r
                      instruction.\r
  @param  RegisterEdx The value to load into EDX or RDX before executing the MONITOR\r
                      instruction.\r
\r
  @return RegisterEax\r
\r
**/\r
UINTN\r
EFIAPI\r
AsmMonitor (\r
  IN      UINTN                     RegisterEax,\r
  IN      UINTN                     RegisterEcx,\r
  IN      UINTN                     RegisterEdx\r
  )\r
{\r
  _asm {\r
    mov     eax, RegisterEax\r
    mov     ecx, RegisterEcx\r
    mov     edx, RegisterEdx\r
    _emit   0x0f             // monitor\r
    _emit   0x01\r
    _emit   0xc8\r
  }\r
}\r
\r