Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2024-07-15 08:56:08 +00:00
Code Issues Packages Projects Releases Wiki Activity

[PERF]: What to do when your SYSEXIT code has a bug? Set KiFastSystemCallDisable to TRUE so it never gets used. Now, for the first time in 3 years and 3 months (not giving a specific revision # to protect the 'innocent'), ReactOS actually fully uses the SYSENTER/SYSEXIT instructions isntead of IRETD, since my code doesn't exhibit the bug and SYSEXIT is safe to use. This should save a good hundred cycles or more per system call.

Browse source 
svn path=/trunk/; revision=45271
This commit is contained in:
Sir Richard 2010-01-26 19:39:21 +00:00
parent dd14b916ff
commit 842d2aa5f9
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
reactos/ntoskrnl/ke/i386/cpu.c
View file

@ -27,7 +27,7 @@ ULONG KeProcessorArchitecture;
ULONG KeProcessorLevel;
ULONG KeProcessorRevision;
ULONG KeFeatureBits;
ULONG KiFastSystemCallDisable = 1;
ULONG KiFastSystemCallDisable;
ULONG KeI386NpxPresent = 0;
ULONG KiMXCsrMask = 0;
ULONG MxcsrFeatureMask = 0;