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fixed registry querying code in Ki386SetProcessorFeatures

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svn path=/trunk/; revision=19746
This commit is contained in:
Thomas Bluemel 2005-11-29 10:09:26 +00:00
parent 8153fdd194
commit c8f142be9f
1 changed files with 20 additions and 6 deletions
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26
reactos/ntoskrnl/ke/i386/kernel.c
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@ -496,7 +496,12 @@ Ki386SetProcessorFeatures(VOID)
UNICODE_STRING ValueName = RTL_CONSTANT_STRING(L"FastSystemCallDisable");
HANDLE KeyHandle;
ULONG ResultLength;
KEY_VALUE_PARTIAL_INFORMATION ValueData;
struct
{
KEY_VALUE_PARTIAL_INFORMATION Info;
UCHAR Buffer[FIELD_OFFSET(KEY_VALUE_PARTIAL_INFORMATION,
Data[0]) + sizeof(ULONG)];
} ValueData;
NTSTATUS Status;
ULONG FastSystemCallDisable = 0;
@ -525,7 +530,7 @@ Ki386SetProcessorFeatures(VOID)
*(PCHAR)RtlPrefetchMemoryNonTemporal = 0x90;
}
/* Does the CPU Support Fast System Call? */
/* Does the CPU Support Fast System Call? */
if (Pcr->PrcbData.FeatureBits & X86_FEATURE_SYSCALL) {
/* FIXME: Check for Family == 6, Model < 3 and Stepping < 3 and disable */
@ -536,20 +541,29 @@ Ki386SetProcessorFeatures(VOID)
OBJ_CASE_INSENSITIVE,
NULL,
NULL);
Status = NtOpenKey(&KeyHandle, KEY_ALL_ACCESS, &ObjectAttributes);
Status = ZwOpenKey(&KeyHandle,
KEY_QUERY_VALUE,
&ObjectAttributes);
if (NT_SUCCESS(Status)) {
/* Read the Value then Close the Key */
Status = NtQueryValueKey(KeyHandle,
Status = ZwQueryValueKey(KeyHandle,
&ValueName,
KeyValuePartialInformation,
&ValueData,
sizeof(ValueData),
&ResultLength);
RtlMoveMemory(&FastSystemCallDisable, ValueData.Data, sizeof(ULONG));
if (NT_SUCCESS(Status))
{
if (ResultLength == sizeof(ValueData) &&
ValueData.Info.Type == REG_DWORD)
{
FastSystemCallDisable = *(PULONG)ValueData.Info.Data != 0;
}
NtClose(KeyHandle);
ZwClose(KeyHandle);
}
}
} else {