Hi, experts:
I am confused by some codes in InitInterruptDescriptorTable() function
(in UefiCpuPkg/CpuDxe/CpuDxe.c).
......
if ((OldIdtPtr.Base != 0) && ((OldIdtPtr.Limit & 7) == 7)) {
// Based on my understanding, because DxeIpl has created IDT when
switching from P-Mode to Long-Mode.
// So, should execute below code.
OldIdt = (IA32_IDT_GATE_DESCRIPTOR*) OldIdtPtr.Base;
OldIdtSize = (OldIdtPtr.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);
......
} else {
OldIdt = NULL;
OldIdtSize = 0;
}
......
// Based on my understanding, When come here, index = OldIdtSize =
32, so CpuRegisterInterruptHandler() could not be run.
for (Index = OldIdtSize; Index < 32; Index++) {
Status = CpuRegisterInterruptHandler (&gCpu, Index,
CommonExceptionHandler);
ASSERT_EFI_ERROR (Status);
}
My question is:
Because DxeIpl has created IDT, and OldIdtSize = 32, so
CpuRegisterInterruptHandler() could not be run, right?
Best wishes,
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