mirror of https://github.com/acidanthera/audk.git
147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
/** @file
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X64 specific functions to support Debug Support protocol.
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Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "PlDebugSupport.h"
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IA32_IDT_GATE_DESCRIPTOR NullDesc = {{0,0}};
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/**
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Get Interrupt Handle from IDT Gate Descriptor.
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@param IdtGateDecriptor IDT Gate Descriptor.
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@return Interrupt Handle stored in IDT Gate Descriptor.
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**/
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UINTN
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GetInterruptHandleFromIdt (
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IN IA32_IDT_GATE_DESCRIPTOR *IdtGateDecriptor
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)
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{
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UINTN InterruptHandle;
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//
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// InterruptHandle 0-15 : OffsetLow
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// InterruptHandle 16-31 : OffsetHigh
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// InterruptHandle 32-63 : OffsetUpper
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//
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((UINT16 *) &InterruptHandle)[0] = (UINT16) IdtGateDecriptor->Bits.OffsetLow;
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((UINT16 *) &InterruptHandle)[1] = (UINT16) IdtGateDecriptor->Bits.OffsetHigh;
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((UINT32 *) &InterruptHandle)[1] = (UINT32) IdtGateDecriptor->Bits.OffsetUpper;
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return InterruptHandle;
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}
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/**
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Allocate pool for a new IDT entry stub.
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Copy the generic stub into the new buffer and fixup the vector number
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and jump target address.
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@param ExceptionType This is the exception type that the new stub will be created
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for.
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@param Stub On successful exit, *Stub contains the newly allocated entry stub.
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**/
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VOID
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CreateEntryStub (
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IN EFI_EXCEPTION_TYPE ExceptionType,
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OUT VOID **Stub
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)
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{
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UINT8 *StubCopy;
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StubCopy = *Stub;
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//
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// Fixup the stub code for this vector
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//
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// The stub code looks like this:
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//
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// 00000000 6A 00 push 0 ; push vector number - will be modified before installed
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// 00000002 E9 db 0e9h ; jump rel32
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// 00000003 00000000 dd 0 ; fixed up to relative address of CommonIdtEntry
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//
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//
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// poke in the exception type so the second push pushes the exception type
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//
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StubCopy[0x1] = (UINT8) ExceptionType;
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//
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// fixup the jump target to point to the common entry
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//
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*(UINT32 *) &StubCopy[0x3] = (UINT32)((UINTN) CommonIdtEntry - (UINTN) &StubCopy[StubSize]);
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return;
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}
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/**
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This is the main worker function that manages the state of the interrupt
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handlers. It both installs and uninstalls interrupt handlers based on the
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value of NewCallback. If NewCallback is NULL, then uninstall is indicated.
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If NewCallback is non-NULL, then install is indicated.
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@param NewCallback If non-NULL, NewCallback specifies the new handler to register.
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If NULL, specifies that the previously registered handler should
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be uninstalled.
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@param ExceptionType Indicates which entry to manage.
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@retval EFI_SUCCESS Process is ok.
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@retval EFI_INVALID_PARAMETER Requested uninstalling a handler from a vector that has
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no handler registered for it
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@retval EFI_ALREADY_STARTED Requested install to a vector that already has a handler registered.
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@retval others Possible return values are passed through from UnHookEntry and HookEntry.
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**/
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EFI_STATUS
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ManageIdtEntryTable (
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CALLBACK_FUNC NewCallback,
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EFI_EXCEPTION_TYPE ExceptionType
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)
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{
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EFI_STATUS Status;
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Status = EFI_SUCCESS;
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if (CompareMem (&IdtEntryTable[ExceptionType].NewDesc, &NullDesc, sizeof (IA32_IDT_GATE_DESCRIPTOR)) != 0) {
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//
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// we've already installed to this vector
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//
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if (NewCallback != NULL) {
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//
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// if the input handler is non-null, error
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//
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Status = EFI_ALREADY_STARTED;
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} else {
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UnhookEntry (ExceptionType);
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}
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} else {
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//
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// no user handler installed on this vector
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//
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if (NewCallback == NULL) {
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//
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// if the input handler is null, error
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//
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Status = EFI_INVALID_PARAMETER;
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} else {
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HookEntry (ExceptionType, NewCallback);
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}
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}
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return Status;
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}
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