MdePkg/BaseLib: Support IA32 processors without CLFLUSH

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

/** @file\r
  Set error flag for all division functions\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>\r
  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
  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