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- Enabled SYSENTER/SYSEXIT for application processors on smp machines.

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svn path=/trunk/; revision=13261
This commit is contained in:
Hartmut Birr 2005-01-25 00:28:45 +00:00
parent a3209eaf3e
commit 93e62510cf
1 changed files with 29 additions and 13 deletions
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42
reactos/ntoskrnl/ke/i386/kernel.c
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@ -43,7 +43,7 @@ BOOLEAN Ke386NoExecute = FALSE;
BOOLEAN Ke386Pae = FALSE;
BOOLEAN Ke386PaeEnabled = FALSE;
BOOLEAN Ke386GlobalPagesEnabled = FALSE;
ULONG KiFastSystemCallDisable = 0;
ULONG KiFastSystemCallDisable = 1;
/* FUNCTIONS *****************************************************************/
@ -192,6 +192,18 @@ KeApplicationProcessorInit(VOID)
KeInitDpc(Pcr);
if (Pcr->PrcbData.FeatureBits & X86_FEATURE_SYSCALL)
{
extern void KiFastCallEntry(void);
/* CS Selector of the target segment. */
Ke386Wrmsr(0x174, KERNEL_CS, 0);
/* Target ESP. */
Ke386Wrmsr(0x175, 0, 0);
/* Target EIP. */
Ke386Wrmsr(0x176, (ULONG_PTR)KiFastCallEntry, 0);
}
/*
* It is now safe to process interrupts
*/
@ -412,6 +424,7 @@ Ki386SetProcessorFeatures(VOID)
ULONG ResultLength;
KEY_VALUE_PARTIAL_INFORMATION ValueData;
NTSTATUS Status;
ULONG FastSystemCallDisable = 0;
SharedUserData->ProcessorFeatures[PF_FLOATING_POINT_PRECISION_ERRATA] = FALSE;
SharedUserData->ProcessorFeatures[PF_FLOATING_POINT_EMULATED] = FALSE;
@ -457,7 +470,7 @@ Ki386SetProcessorFeatures(VOID)
&ValueData,
sizeof(ValueData),
&ResultLength);
RtlMoveMemory(&KiFastSystemCallDisable, ValueData.Data, sizeof(ULONG));
RtlMoveMemory(&FastSystemCallDisable, ValueData.Data, sizeof(ULONG));
NtClose(KeyHandle);
}
@ -465,21 +478,12 @@ Ki386SetProcessorFeatures(VOID)
} else {
/* Disable SYSENTER/SYSEXIT, because the CPU doesn't support it */
KiFastSystemCallDisable = 1;
FastSystemCallDisable = 1;
}
if (!KiFastSystemCallDisable) {
if (FastSystemCallDisable) {
/* Use SYSENTER */
SharedUserData->SystemCall[0] = 0x8B;
SharedUserData->SystemCall[1] = 0xD4;
SharedUserData->SystemCall[2] = 0x0F;
SharedUserData->SystemCall[3] = 0x34;
SharedUserData->SystemCall[4] = 0xC3;
} else {
/* Use INT2E */
SharedUserData->SystemCall[0] = 0x8D;
SharedUserData->SystemCall[1] = 0x54;
@ -488,5 +492,17 @@ Ki386SetProcessorFeatures(VOID)
SharedUserData->SystemCall[4] = 0xCD;
SharedUserData->SystemCall[5] = 0x2E;
SharedUserData->SystemCall[6] = 0xC3;
} else {
/* Use SYSENTER */
SharedUserData->SystemCall[0] = 0x8B;
SharedUserData->SystemCall[1] = 0xD4;
SharedUserData->SystemCall[2] = 0x0F;
SharedUserData->SystemCall[3] = 0x34;
SharedUserData->SystemCall[4] = 0xC3;
/* Enable SYSENTER/SYSEXIT */
KiFastSystemCallDisable = 0;
}
}