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[NTOSKRNL]

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Revert r51748 by popular demand

svn path=/trunk/; revision=52134
This commit is contained in:
Timo Kreuzer 2011-06-07 19:50:01 +00:00
parent fcff3cbf18
commit 7ae4309300
1 changed files with 15 additions and 46 deletions
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61
reactos/ntoskrnl/ex/i386/fastinterlck_asm.S
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@ -4,9 +4,8 @@
* FILE: ntoskrnl/ex/i386/fastinterlck_asm.S * FILE: ntoskrnl/ex/i386/fastinterlck_asm.S
* PURPOSE: FASTCALL Interlocked Functions * PURPOSE: FASTCALL Interlocked Functions
* PROGRAMMERS: Alex Ionescu (alex@relsoft.net) * PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
* Paolo Bonzini <bonzini [at] gnu [dot] org>
*/ */
/* INCLUDES ******************************************************************/ /* INCLUDES ******************************************************************/
#include <asm.inc> #include <asm.inc>
@ -32,56 +31,26 @@
*/ */
PUBLIC @ExInterlockedAddLargeStatistic@8 PUBLIC @ExInterlockedAddLargeStatistic@8
@ExInterlockedAddLargeStatistic@8: @ExInterlockedAddLargeStatistic@8:
push ebp
push ebx
mov ebp, ecx
Again: #ifdef CONFIG_SMP
/* Load comparand in eax for cmpxchg */ /* Do the addition */
mov eax, [ebp] lock add [ecx], edx
/* Compute low word of the result in ebx */ /* Check for carry bit and return */
mov ebx, edx jb .l1
add ebx, eax
/* Carry needs cmpxchg8b */
jc Slow
/* Fast path still needs to be atomic, so use cmpxchg and retry if it fails
* Hopefully it will still get through this path :) */
LOCK cmpxchg [ecx], ebx
jnz Again
/* Thats it */
pop ebx
pop ebp
ret ret
Slow: .l1:
/* Save increment across cmpxchg8b */ /* Add carry */
push edx lock adc dword ptr [ecx+4], 0
#else
/* Finish loading comparand in edx:eax */ /* Do the addition and add the carry */
mov edx, [ebp+4] add dword ptr [ecx], edx
adc dword ptr [ecx+4], 0
/* Result in ecx:ebx (we know there's carry) */ #endif
lea ecx, [edx+1] /* Return */
/* Do a full exchange */
LOCK cmpxchg8b [ebp]
/* restore increment */
pop edx
/* Need to retry */
jnz Again
/* Thats it */
pop ebx
pop ebp
ret ret
/*ULONG /*ULONG
*FASTCALL *FASTCALL
*ExfInterlockedAddUlong(IN PULONG Addend, *ExfInterlockedAddUlong(IN PULONG Addend,