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

/** @file\r
  AsmWriteIdtr function\r
\r
  Copyright (c) 2006 - 2010, 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
  Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.\r
\r
  Writes the current IDTR descriptor and returns it in Idtr. This function is\r
  only available on IA-32 and x64.\r
\r
  @param  Idtr  The pointer to a IDTR descriptor.\r
\r
**/\r
VOID\r
EFIAPI\r
InternalX86WriteIdtr (\r
  IN      CONST IA32_DESCRIPTOR     *Idtr\r
  )\r
{\r
  _asm {\r
    mov     eax, Idtr\r
    pushfd\r
    cli\r
    lidt    fword ptr [eax]\r
    popfd\r
  }\r
}\r
\r
Commit	Line	Data
e1f414b6	1	/** @file\r
	2	AsmWriteIdtr function\r
	3	\r
bb817c56	4	Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
9344f092	5	SPDX-License-Identifier: BSD-2-Clause-Patent\r
e1f414b6	6	\r
	7	**/\r
	8	\r
1efcc4ae	9	\r
47fc17d8	10	#include "BaseLibInternals.h"\r
e1f414b6	11	\r
42eedea9	12	/**\r
	13	Writes the current Interrupt Descriptor Table Register(GDTR) descriptor.\r
	14	\r
	15	Writes the current IDTR descriptor and returns it in Idtr. This function is\r
030cd1a2	16	only available on IA-32 and x64.\r
42eedea9	17	\r
2fc59a00	18	@param Idtr The pointer to a IDTR descriptor.\r
42eedea9	19	\r
42eedea9	20	**/\r
e1f414b6	21	VOID\r
	22	EFIAPI\r
	23	InternalX86WriteIdtr (\r
	24	IN CONST IA32_DESCRIPTOR *Idtr\r
	25	)\r
	26	{\r
	27	_asm {\r
	28	mov eax, Idtr\r
28b5f7c0	29	pushfd\r
28b5f7c0	30	cli\r
e1f414b6	31	lidt fword ptr [eax]\r
28b5f7c0	32	popfd\r
e1f414b6	33	}\r
	34	}\r
	35	\r