vendor/edk2/7babb4372e6a34cbbc54249b25056272a5a9924c

1 files changed, 44 insertions, 0 deletions

diff --git a/MdePkg/Library/BaseLib/Ia32/MultU64x64.S b/MdePkg/Library/BaseLib/Ia32/MultU64x64.S
new file mode 100644
index 000000000000..3aae054813c2
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/MultU64x64.S
@@ -0,0 +1,44 @@
+#------------------------------------------------------------------------------
+#
+# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+# 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.
+#
+# Module Name:
+#
+#   MultU64x64.S
+#
+# Abstract:
+#
+#   Calculate the product of a 64-bit integer and another 64-bit integer
+#
+#------------------------------------------------------------------------------
+
+ASM_GLOBAL ASM_PFX(InternalMathMultU64x64)
+
+#------------------------------------------------------------------------------
+# UINT64
+# EFIAPI
+# InternalMathMultU64x64 (
+#   IN      UINT64                    Multiplicand,
+#   IN      UINT64                    Multiplier
+#   );
+#------------------------------------------------------------------------------
+ASM_PFX(InternalMathMultU64x64):
+    push    %ebx                                     
+    movl    8(%esp), %ebx             # ebx <- M1[0..31]                
+    movl    16(%esp), %edx            # edx <- M2[0..31]                                   
+    movl    %ebx, %ecx                                                  
+    movl    %edx, %eax                
+    imull   20(%esp), %ebx            # ebx <- M1[0..31] * M2[32..63]   
+    imull   12(%esp), %edx            # edx <- M1[32..63] * M2[0..31]   
+    addl    %edx, %ebx                # carries are abandoned           
+    mull    %ecx                      # edx:eax <- M1[0..31] * M2[0..31]
+    addl    %ebx, %edx                # carries are abandoned           
+    pop     %ebx
+    ret