[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / DivU64x32Remainder.c

/** @file\r
  Set error flag for all division functions\r
\r
  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
  All rights reserved. This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
//\r
// Include common header file for this module.\r
//\r
\r
\r
/**\r
  Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r
  generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.\r
\r
  This function divides the 64-bit unsigned value Dividend by the 32-bit\r
  unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r
  is not NULL, then the 32-bit unsigned remainder is returned in Remainder.\r
  This function returns the 64-bit unsigned quotient.\r
\r
  @param  Dividend  A 64-bit unsigned value.\r
  @param  Divisor   A 32-bit unsigned value.\r
  @param  Remainder A pointer to a 32-bit unsigned value. This parameter is\r
                    optional and may be NULL.\r
\r
  @return Dividend / Divisor\r
\r
**/\r
UINT64\r
EFIAPI\r
InternalMathDivRemU64x32 (\r
  IN      UINT64                    Dividend,\r
  IN      UINT32                    Divisor,\r
  OUT     UINT32                    *Remainder\r
  )\r
{\r
  _asm {\r
    mov     ecx, Divisor\r
    mov     eax, dword ptr [Dividend + 4]\r
    xor     edx, edx\r
    div     ecx\r
    push    eax\r
    mov     eax, dword ptr [Dividend + 0]\r
    div     ecx\r
    mov     ecx, Remainder\r
    jecxz   RemainderNull                      // abandon remainder if Remainder == NULL\r
    mov     [ecx], edx\r
RemainderNull:\r
    pop     edx\r
  }\r
}\r
\r
Commit	Line	Data
e1f414b6	1	/** @file\r
	2	Set error flag for all division functions\r
	3	\r
	4	Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
	5	All rights reserved. This program and the accompanying materials\r
	6	are licensed and made available under the terms and conditions of the BSD License\r
	7	which accompanies this distribution. The full text of the license may be found at\r
	8	http://opensource.org/licenses/bsd-license.php\r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	12	\r
	13	**/\r
	14	\r
	15	//\r
	16	// Include common header file for this module.\r
	17	//\r
f734a10a	18	\r
e1f414b6	19	\r
42eedea9	20	/**\r
	21	Divides a 64-bit unsigned integer by a 32-bit unsigned integer and\r
	22	generates a 64-bit unsigned result and an optional 32-bit unsigned remainder.\r
	23	\r
	24	This function divides the 64-bit unsigned value Dividend by the 32-bit\r
	25	unsigned value Divisor and generates a 64-bit unsigned quotient. If Remainder\r
	26	is not NULL, then the 32-bit unsigned remainder is returned in Remainder.\r
	27	This function returns the 64-bit unsigned quotient.\r
	28	\r
	29	@param Dividend A 64-bit unsigned value.\r
	30	@param Divisor A 32-bit unsigned value.\r
	31	@param Remainder A pointer to a 32-bit unsigned value. This parameter is\r
	32	optional and may be NULL.\r
	33	\r
	34	@return Dividend / Divisor\r
	35	\r
	36	**/\r
e1f414b6	37	UINT64\r
	38	EFIAPI\r
	39	InternalMathDivRemU64x32 (\r
	40	IN UINT64 Dividend,\r
	41	IN UINT32 Divisor,\r
	42	OUT UINT32 *Remainder\r
	43	)\r
	44	{\r
	45	_asm {\r
	46	mov ecx, Divisor\r
	47	mov eax, dword ptr [Dividend + 4]\r
	48	xor edx, edx\r
	49	div ecx\r
	50	push eax\r
	51	mov eax, dword ptr [Dividend + 0]\r
	52	div ecx\r
	53	mov ecx, Remainder\r
	54	jecxz RemainderNull // abandon remainder if Remainder == NULL\r
	55	mov [ecx], edx\r
	56	RemainderNull:\r
	57	pop edx\r
	58	}\r
	59	}\r
	60	\r