[ros-diffs] [hbirr] 19764: - Used the already detected cache line size for RtlPrefetchMemoryNonTemporal.

- Used the already detected cache line size for
RtlPrefetchMemoryNonTemporal.  
- Initialized RtlPrefetchMemoryNonTemporal earlier.  
- Change the memory protection during the initialisation of
RtlPrefetchMemoryNonTemporal.
Modified: trunk/reactos/lib/rtl/i386/mem_asm.S
Modified: trunk/reactos/ntoskrnl/ke/i386/kernel.c
  _____

Modified: trunk/reactos/lib/rtl/i386/mem_asm.S
--- trunk/reactos/lib/rtl/i386/mem_asm.S	2005-11-30 00:17:14 UTC
(rev 19763)
+++ trunk/reactos/lib/rtl/i386/mem_asm.S	2005-11-30 00:25:48 UTC
(rev 19764)
@@ -151,13 +151,12 @@

@RtlPrefetchMemoryNonTemporal@8:
    ret         /* Overwritten by ntoskrnl/ke/i386/kernel.c if SSE
is supported (see Ki386SetProcessorFeatures() ) */

-	mov eax, [_Ke386CacheGranularity]    // Get cache line size
+	mov eax, [_Ke386CacheAlignment]    // Get cache line size

// This is fastcall, so ecx = address, edx = size
-	fetch_next_line:
+fetch_next_line:
    prefetchnta byte ptr [ecx]  // prefechnta(address)
-	sub edx, eax                // count = count - cache_line_size
    add ecx, eax                // address = address +
cache_line_size
-	cmp edx, 0                  // if(count) > 0
+	sub edx, eax                // count = count - cache_line_size
    ja fetch_next_line          //     goto fetch_next_line
    ret
  _____

Modified: trunk/reactos/ntoskrnl/ke/i386/kernel.c
--- trunk/reactos/ntoskrnl/ke/i386/kernel.c	2005-11-30 00:17:14 UTC
(rev 19763)
+++ trunk/reactos/ntoskrnl/ke/i386/kernel.c	2005-11-30 00:25:48 UTC
(rev 19764)
@@ -22,7 +22,6 @@

ULONG Ke386CacheAlignment;
 CHAR Ke386CpuidModel[49] = {0,};
 ULONG Ke386L1CacheSize;
-ULONG Ke386CacheGranularity = 0x40;      /* FIXME: Default to 64 bytes
for RtlPrefetchMemoryNonTemporal(), need real size */
 BOOLEAN Ke386NoExecute = FALSE;
 BOOLEAN Ke386Pae = FALSE;
 BOOLEAN Ke386GlobalPagesEnabled = FALSE;
@@ -418,6 +417,18 @@
       /* Target EIP. */
       Ke386Wrmsr(0x176, (ULONG_PTR)KiFastCallEntry, 0);
    }
+
+   /* Does the CPU Support 'prefetchnta' (SSE)  */
+   if(KPCR->PrcbData.FeatureBits & X86_FEATURE_SSE)
+   {
+       ULONG Protect;
+
+       Protect = MmGetPageProtect(NULL,
(PVOID)RtlPrefetchMemoryNonTemporal);
+       MmSetPageProtect(NULL, (PVOID)RtlPrefetchMemoryNonTemporal,
Protect | PAGE_IS_WRITABLE);
+       /* Replace the ret by a nop */
+       *(PCHAR)RtlPrefetchMemoryNonTemporal = 0x90;
+       MmSetPageProtect(NULL, (PVOID)RtlPrefetchMemoryNonTemporal,
Protect);
+   }
 }

VOID
@@ -523,13 +534,6 @@
    SharedUserData->ProcessorFeatures[PF_XMMI64_INSTRUCTIONS_AVAILABLE]
=
       (Pcr->PrcbData.FeatureBits & X86_FEATURE_SSE2);

-   /* Does the CPU Support 'prefetchnta' (SSE)  */
-   if(Pcr->PrcbData.FeatureBits & X86_FEATURE_SSE)
-   {
-       /* Replace the ret by a nop */
-       /* FIXME - *(PCHAR)RtlPrefetchMemoryNonTemporal = 0x90; */
-   }
-
    /* Does the CPU Support Fast System Call? */   
    if (Pcr->PrcbData.FeatureBits & X86_FEATURE_SYSCALL) {