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

/** @file\r
  AsmReadGdtr 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
#include "BaseLibInternals.h"\r
\r
\r
/**\r
  Reads the current Global Descriptor Table Register(GDTR) descriptor.\r
\r
  Reads and returns the current GDTR descriptor and returns it in Gdtr. This\r
  function is only available on IA-32 and x64.\r
\r
  @param  Gdtr  The pointer to a GDTR descriptor.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalX86ReadGdtr (\r
  OUT IA32_DESCRIPTOR  *Gdtr\r
  )\r
{\r
  _asm {\r
    mov     eax, Gdtr\r
    sgdt    fword ptr [eax]\r
  }\r
}\r
\r
Commit	Line	Data
	1	/** @file\r
	2	AsmReadGdtr 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	#include "BaseLibInternals.h"\r
	11	\r
	12	\r
	13	/**\r
	14	Reads the current Global Descriptor Table Register(GDTR) descriptor.\r
	15	\r
	16	Reads and returns the current GDTR descriptor and returns it in Gdtr. This\r
	17	function is only available on IA-32 and x64.\r
	18	\r
	19	@param Gdtr The pointer to a GDTR descriptor.\r
	20	\r
	21	**/\r
	22	VOID\r
	23	EFIAPI\r
	24	InternalX86ReadGdtr (\r
	25	OUT IA32_DESCRIPTOR *Gdtr\r
	26	)\r
	27	{\r
	28	_asm {\r
	29	mov eax, Gdtr\r
	30	sgdt fword ptr [eax]\r
	31	}\r
	32	}\r
	33	\r