1 files changed, 66 insertions, 0 deletions
diff --git a/OldMdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.c b/OldMdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.c
new file mode 100644
index 0000000000..14b2f2789b
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/DivU64x64Remainder.c
@@ -0,0 +1,66 @@
+/** @file
+  Calculate the quotient of a 64-bit integer by a 64-bit integer and returns
+  both the quotient and the remainderSet error flag for all division functions
+
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>
+  All rights reserved. This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+UINT64
+EFIAPI
+InternalMathDivRemU64x64 (
+  IN      UINT64                    Dividend,
+  IN      UINT64                    Divisor,
+  OUT     UINT64                    *Remainder    OPTIONAL
+  )
+{
+  _asm {
+    mov     edx, dword ptr [Dividend + 4]
+    mov     eax, dword ptr [Dividend + 0]   // edx:eax <- dividend
+    mov     edi, edx
+    mov     esi, eax                    // edi:esi <- dividend
+    mov     ecx, dword ptr [Divisor + 4]
+    mov     ebx, dword ptr [Divisor + 0]   // ecx:ebx <- divisor
+BitLoop:
+    shr     edx, 1
+    rcr     eax, 1
+    shrd    ebx, ecx, 1
+    shr     ecx, 1
+    jnz     BitLoop
+    div     ebx
+    mov     ebx, eax                    // ebx <- quotient
+    mov     ecx, dword ptr [Divisor + 4]
+    mul     dword ptr [Divisor]
+    imul    ecx, ebx
+    add     edx, ecx
+    mov     ecx, Remainder
+    jc      TooLarge                   // product > 2^64
+    cmp     edi, edx                    // compare high 32 bits
+    ja      Correct
+    jb      TooLarge                   // product > dividend
+    cmp     esi, eax
+    jae     Correct                    // product <= dividend
+TooLarge:
+    dec     ebx                         // adjust quotient by -1
+    jecxz   Return                     // return if Remainder == NULL
+    sub     eax, dword ptr [Divisor + 0]
+    sbb     edx, dword ptr [Divisor + 4]
+Correct:
+    jecxz   Return
+    sub     esi, eax
+    sbb     edi, edx                    // edi:esi <- remainder
+    mov     [ecx], esi
+    mov     [ecx + 4], edi
+Return:
+    mov     eax, ebx                    // eax <- quotient
+    xor     edx, edx
+  }
+}
+