MdePkg/BaseLib: Support IA32 processors without CLFLUSH

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / MultU64x64.S

diff --git a/MdePkg/Library/BaseLib/Ia32/MultU64x64.S b/MdePkg/Library/BaseLib/Ia32/MultU64x64.S
index 8841fc44dc2eb2179a65895a7eed1af038e129c0..48f4ae037eafbd298e9736aaa6328a32acd988fa 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/MultU64x64.S
+++ b/MdePkg/Library/BaseLib/Ia32/MultU64x64.S
@@ -1,17 +1,17 @@
 #------------------------------------------------------------------------------\r
 #\r
-# Copyright (c) 2006, Intel Corporation\r
-# All rights reserved. This program and the accompanying materials\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
+# 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
+#   MultU64x64.S\r
 #\r
 # Abstract:\r
 #\r
@@ -19,31 +19,26 @@
 #\r
 #------------------------------------------------------------------------------\r
 \r
+ASM_GLOBAL ASM_PFX(InternalMathMultU64x64)\r
 \r
-\r
-     \r
-\r
-.global _MultS64x64\r
-_MultS64x64: \r
-    #\r
-    # MultS64x32 shares the same implementation with _MultU64x32, and thus no\r
-    # code inside this function.\r
-    #\r
-\r
-\r
-.global _MultU64x64\r
-    push    %ebx\r
-    movl    8(%esp),%ebx\r
-    movl    16(%esp),%edx\r
-    movl    %ebx,%ecx\r
-    movl    %edx,%eax\r
-    imull   20(%esp),%ebx\r
-    imull   12(%esp),%edx\r
-    addl    %edx,%ebx\r
-    mull    %ecx\r
-    addl    %ebx,%edx\r
+#------------------------------------------------------------------------------\r
+# UINT64\r
+# EFIAPI\r
+# InternalMathMultU64x64 (\r
+#   IN      UINT64                    Multiplicand,\r
+#   IN      UINT64                    Multiplier\r
+#   );\r
+#------------------------------------------------------------------------------\r
+ASM_PFX(InternalMathMultU64x64):\r
+    push    %ebx                                     \r
+    movl    8(%esp), %ebx             # ebx <- M1[0..31]                \r
+    movl    16(%esp), %edx            # edx <- M2[0..31]                                   \r
+    movl    %ebx, %ecx                                                  \r
+    movl    %edx, %eax                \r
+    imull   20(%esp), %ebx            # ebx <- M1[0..31] * M2[32..63]   \r
+    imull   12(%esp), %edx            # edx <- M1[32..63] * M2[0..31]   \r
+    addl    %edx, %ebx                # carries are abandoned           \r
+    mull    %ecx                      # edx:eax <- M1[0..31] * M2[0..31]\r
+    addl    %ebx, %edx                # carries are abandoned           \r
     pop     %ebx\r
     ret\r
-\r
-\r
-\r