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85f7e11021
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>
96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/** @file
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X64 arch function to access IDT vector.
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Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PeCoffExtraActionLib.h>
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/**
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Read IDT entry to check if IDT entries are setup by Debug Agent.
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@param[in] IdtDescriptor Pointer to IDT Descriptor.
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@param[in] InterruptType Interrupt type.
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@retval TRUE IDT entries were setup by Debug Agent.
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@retval FALSE IDT entries were not setuo by Debug Agent.
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**/
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BOOLEAN
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CheckDebugAgentHandler (
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IN IA32_DESCRIPTOR *IdtDescriptor,
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IN UINTN InterruptType
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)
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{
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IA32_IDT_GATE_DESCRIPTOR *IdtEntry;
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UINTN InterruptHandler;
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IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *) IdtDescriptor->Base;
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if (IdtEntry == NULL) {
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return FALSE;
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}
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InterruptHandler = IdtEntry[InterruptType].Bits.OffsetLow +
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(((UINTN)IdtEntry[InterruptType].Bits.OffsetHigh) << 16) +
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(((UINTN)IdtEntry[InterruptType].Bits.OffsetUpper) << 32);
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if (InterruptHandler >= sizeof (UINT32) && *(UINT32 *)(InterruptHandler - sizeof (UINT32)) == AGENT_HANDLER_SIGNATURE) {
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return TRUE;
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} else {
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return FALSE;
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}
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}
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/**
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Save IDT entry for INT1 and update it.
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@param[in] IdtDescriptor Pointer to IDT Descriptor.
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@param[out] SavedIdtEntry Original IDT entry returned.
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**/
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VOID
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SaveAndUpdateIdtEntry1 (
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IN IA32_DESCRIPTOR *IdtDescriptor,
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OUT IA32_IDT_GATE_DESCRIPTOR *SavedIdtEntry
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)
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{
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IA32_IDT_GATE_DESCRIPTOR *IdtEntry;
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UINT16 CodeSegment;
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UINTN InterruptHandler;
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IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *) IdtDescriptor->Base;
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CopyMem (SavedIdtEntry, &IdtEntry[1], sizeof (IA32_IDT_GATE_DESCRIPTOR));
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//
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// Use current CS as the segment selector of interrupt gate in IDT
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//
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CodeSegment = AsmReadCs ();
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InterruptHandler = (UINTN) &AsmInterruptHandle;
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IdtEntry[1].Bits.OffsetLow = (UINT16)(UINTN)InterruptHandler;
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IdtEntry[1].Bits.OffsetHigh = (UINT16)((UINTN)InterruptHandler >> 16);
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IdtEntry[1].Bits.OffsetUpper = (UINT32)((UINTN)InterruptHandler >> 32);
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IdtEntry[1].Bits.Selector = CodeSegment;
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IdtEntry[1].Bits.GateType = IA32_IDT_GATE_TYPE_INTERRUPT_32;
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}
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/**
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Restore IDT entry for INT1.
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@param[in] IdtDescriptor Pointer to IDT Descriptor.
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@param[in] RestoredIdtEntry IDT entry to be restored.
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**/
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VOID
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RestoreIdtEntry1 (
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IN IA32_DESCRIPTOR *IdtDescriptor,
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IN IA32_IDT_GATE_DESCRIPTOR *RestoredIdtEntry
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)
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{
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IA32_IDT_GATE_DESCRIPTOR *IdtEntry;
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IdtEntry = (IA32_IDT_GATE_DESCRIPTOR *) IdtDescriptor->Base;
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CopyMem (&IdtEntry[1], RestoredIdtEntry, sizeof (IA32_IDT_GATE_DESCRIPTOR));
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}
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