diff options
| author | hhtian <hhtian@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-11-01 06:30:58 +0000 |
|---|---|---|
| committer | hhtian <hhtian@6f19259b-4bc3-4df7-8a09-765794883524> | 2010-11-01 06:30:58 +0000 |
| commit | 97f98500c1d40eba76210961e90ea5d354bcbc18 (patch) | |
| tree | 88513b4a041208d992929db5703a4312a0497a3b /CryptoPkg/Library/BaseCryptLib/SysCall/Ia32/MathRShiftU64.c | |
| parent | a3bcde70e6dc69000f85cc5deee98101d2ae200a (diff) | |
| download | edk2-platforms-97f98500c1d40eba76210961e90ea5d354bcbc18.tar.xz | |
Add CryptoPkg (from UDK2010.UP3)
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10987 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'CryptoPkg/Library/BaseCryptLib/SysCall/Ia32/MathRShiftU64.c')
| -rw-r--r-- | CryptoPkg/Library/BaseCryptLib/SysCall/Ia32/MathRShiftU64.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/Ia32/MathRShiftU64.c b/CryptoPkg/Library/BaseCryptLib/SysCall/Ia32/MathRShiftU64.c new file mode 100644 index 0000000000..b7224d6455 --- /dev/null +++ b/CryptoPkg/Library/BaseCryptLib/SysCall/Ia32/MathRShiftU64.c @@ -0,0 +1,57 @@ +/** @file
+ 64-bit Math Worker Function.
+ The 32-bit versions of C compiler generate calls to library routines
+ to handle 64-bit math. These functions use non-standard calling conventions.
+
+Copyright (c) 2009 - 2010, 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.
+
+**/
+
+
+/*
+ * Shifts a 64-bit unsigned value right by a certain number of bits.
+ */
+__declspec(naked) void __cdecl _aullshr (void)
+{
+ _asm {
+ ;
+ ; Checking: Only handle 64bit shifting or more
+ ;
+ cmp cl, 64
+ jae _Exit
+
+ ;
+ ; Handle shifting between 0 and 31 bits
+ ;
+ cmp cl, 32
+ jae More32
+ shrd eax, edx, cl
+ shr edx, cl
+ ret
+
+ ;
+ ; Handle shifting of 32-63 bits
+ ;
+More32:
+ mov eax, edx
+ xor edx, edx
+ and cl, 31
+ shr eax, cl
+ ret
+
+ ;
+ ; Invalid number (less then 32bits), return 0
+ ;
+_Exit:
+ xor eax, eax
+ xor edx, edx
+ ret
+ }
+}
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