Inline ASM in .c file is specific to MS tool-chain. Other tool-chain (such as Intel compiler) may not support it. Add in .asm files to make these function to be built by Assembler so that they are avaliable too for other tool-chain.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5529 6f19259b-4bc3-4df7-8a09-765794883524
2008-07-21 01:49:04 +00:00
parent 22353b17c0
commit 478db76bbe
10 changed files with 1026 additions and 0 deletions
--- a/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/GetPowerOfTwo.asm
+++ b/EdkCompatibilityPkg/Foundation/Library/EfiCommonLib/Ia32/GetPowerOfTwo.asm
@@ -0,0 +1,67 @@
+;/*++
+;
+;Copyright (c) 2006, Intel Corporation                                                         
+;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.             
+;
+;Module Name:
+;
+;  GetPowerOfTwo.c
+;
+;Abstract:
+;
+;  Calculates the largest integer that is both 
+;  a power of two and less than Input
+;
+;--*/
+;---------------------------------------------------------------------------
+    .686
+    .model  flat,C
+    .code
+
+;---------------------------------------------------------------------------
+
+;UINT64
+;GetPowerOfTwo (
+;  IN UINT64   Input
+;  )
+;/*++
+;
+;Routine Description:
+;
+;  Calculates the largest integer that is both 
+;  a power of two and less than Input
+;
+;Arguments:
+;
+;  Input  - value to calculate power of two
+;
+;Returns:
+;
+;  the largest integer that is both  a power of 
+;  two and less than Input
+;
+;--*/
+GetPowerOfTow PROC
+    xor     eax, eax
+    mov     edx, eax
+    mov     ecx, [esp + 8] ; dword ptr Input[4]
+    jecxz   _F
+    bsr     ecx, ecx
+    bts     edx, ecx
+    jmp     _Exit
+_F:
+    mov     ecx, [esp + 4] ; dword ptr Input[0]
+    jecxz   _Exit
+    bsr     ecx, ecx
+    bts     eax, ecx
+_Exit:
+
+    ret
+GetPowerOfTow  ENDP
+	END