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

/** @file\r
  AsmReadPmc 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
  Reads the current value of a Performance Counter (PMC).\r
\r
  Reads and returns the current value of performance counter specified by\r
  Index. This function is only available on IA-32 and x64.\r
\r
  @param  Index The 32-bit Performance Counter index to read.\r
\r
  @return The value of the PMC specified by Index.\r
\r
**/\r
UINT64\r
EFIAPI\r
AsmReadPmc (\r
  IN UINT32   Index\r
  )\r
{\r
  _asm {\r
    mov     ecx, Index\r
    rdpmc\r
  }\r
}\r
\r
Commit	Line	Data
	1	/** @file\r
	2	AsmReadPmc function\r
	3	\r
	4	Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
	5	SPDX-License-Identifier: BSD-2-Clause-Patent\r
	6	\r
	7	**/\r
	8	\r
	9	/**\r
	10	Reads the current value of a Performance Counter (PMC).\r
	11	\r
	12	Reads and returns the current value of performance counter specified by\r
	13	Index. This function is only available on IA-32 and x64.\r
	14	\r
	15	@param Index The 32-bit Performance Counter index to read.\r
	16	\r
	17	@return The value of the PMC specified by Index.\r
	18	\r
	19	**/\r
	20	UINT64\r
	21	EFIAPI\r
	22	AsmReadPmc (\r
	23	IN UINT32 Index\r
	24	)\r
	25	{\r
	26	_asm {\r
	27	mov ecx, Index\r
	28	rdpmc\r
	29	}\r
	30	}\r
	31	\r