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a)Save and disable CPU interrupt before calling AsmWriteIdtr(). 

b)Restore CPU interrupt status after callng AsmWriteIdtr().


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9956 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
vanjeff 2010-02-09 09:23:17 +00:00
parent 9612f0c23c
commit ea99e00d76
1 changed files with 13 additions and 0 deletions
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13
UefiCpuPkg/CpuDxe/CpuDxe.c
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@ -1014,6 +1014,7 @@ InitInterruptDescriptorTable (
IA32_DESCRIPTOR *IdtPtr;
UINTN Index;
UINTN CurrentHandler;
BOOLEAN InterruptState;
SetMem (ExternalVectorTable, sizeof(ExternalVectorTable), 0);
@ -1040,7 +1041,19 @@ InitInterruptDescriptorTable (
IdtPtr = ALIGN_POINTER (IdtPtrAlignmentBuffer, 16);
IdtPtr->Base = (UINT32)(((UINTN)(VOID*) gIdtTable) & (BASE_4GB-1));
IdtPtr->Limit = sizeof (gIdtTable) - 1;
//
// Disable interrupts and save the current interrupt state
//
InterruptState = SaveAndDisableInterrupts ();
AsmWriteIdtr (IdtPtr);
//
// Restore the interrupt state
//
SetInterruptState (InterruptState);
FreePool (IdtPtrAlignmentBuffer);
//