Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ia32 / MultU64x64.asm

diff --git a/OldMdePkg/Library/BaseLib/Ia32/MultU64x64.asm b/OldMdePkg/Library/BaseLib/Ia32/MultU64x64.asm
new file mode 100644 (file)
index 0000000..f367954
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/MultU64x64.asm
@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation\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
+; Module Name:\r
+;\r
+;   MultU64x64.asm\r
+;\r
+; Abstract:\r
+;\r
+;   Calculate the product of a 64-bit integer and another 64-bit integer\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .386\r
+    .model  flat,C\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\r
+; UINT64\r
+; EFIAPI\r
+; InternalMathMultU64x64 (\r
+;   IN      UINT64                    Multiplicand,\r
+;   IN      UINT64                    Multiplier\r
+;   );\r
+;------------------------------------------------------------------------------\r
+InternalMathMultU64x64  PROC    USES    ebx\r
+    mov     ebx, [esp + 8]              ; ebx <- M1[0..31]\r
+    mov     edx, [esp + 16]             ; edx <- M2[0..31]\r
+    mov     ecx, ebx\r
+    mov     eax, edx\r
+    imul    ebx, [esp + 20]             ; ebx <- M1[0..31] * M2[32..63]\r
+    imul    edx, [esp + 12]             ; edx <- M1[32..63] * M2[0..31]\r
+    add     ebx, edx                    ; carries are abandoned\r
+    mul     ecx                         ; edx:eax <- M1[0..31] * M2[0..31]\r
+    add     edx, ebx                    ; carries are abandoned\r
+    ret\r
+InternalMathMultU64x64  ENDP\r
+\r
+    END\r