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

/** @file\r
  AsmReadGs 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
\r
\r
/**\r
  Reads the current value of GS Data Segment Register (GS).\r
\r
  Reads and returns the current value of GS. This function is only available on\r
  IA-32 and x64.\r
\r
  @return The current value of GS.\r
\r
**/\r
UINT16\r
EFIAPI\r
AsmReadGs (\r
  VOID\r
  )\r
{\r
  __asm {\r
    xor     eax, eax\r
    mov     ax, gs\r
  }\r
}\r
\r
Commit	Line	Data
e1f414b6	1	/** @file\r
	2	AsmReadGs function\r
	3	\r
bb817c56	4	Copyright (c) 2006 - 2008, 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
f734a10a	10	\r
e1f414b6	11	\r
42eedea9	12	/**\r
	13	Reads the current value of GS Data Segment Register (GS).\r
	14	\r
	15	Reads and returns the current value of GS. This function is only available on\r
030cd1a2	16	IA-32 and x64.\r
42eedea9	17	\r
	18	@return The current value of GS.\r
	19	\r
	20	**/\r
e1f414b6	21	UINT16\r
	22	EFIAPI\r
	23	AsmReadGs (\r
	24	VOID\r
	25	)\r
	26	{\r
	27	__asm {\r
	28	xor eax, eax\r
	29	mov ax, gs\r
	30	}\r
	31	}\r
	32	\r