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- /** @file
- CPU exception handler library implemenation for SEC/PEIM modules.
- Copyright (c) 2012 - 2018, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <PiPei.h>
- #include <Library/VmgExitLib.h>
- #include "CpuExceptionCommon.h"
- CONST UINTN mDoFarReturnFlag = 0;
- /**
- Common exception handler.
- @param ExceptionType Exception type.
- @param SystemContext Pointer to EFI_SYSTEM_CONTEXT.
- **/
- VOID
- EFIAPI
- CommonExceptionHandler (
- IN EFI_EXCEPTION_TYPE ExceptionType,
- IN EFI_SYSTEM_CONTEXT SystemContext
- )
- {
- if (ExceptionType == VC_EXCEPTION) {
- EFI_STATUS Status;
- //
- // #VC needs to be handled immediately upon enabling exception handling
- // and therefore can't use the RegisterCpuInterruptHandler() interface
- // (which isn't supported under Sec and Pei anyway).
- //
- // Handle the #VC:
- // On EFI_SUCCESS - Exception has been handled, return
- // On other - ExceptionType contains (possibly new) exception
- // value
- //
- Status = VmgExitHandleVc (&ExceptionType, SystemContext);
- if (!EFI_ERROR (Status)) {
- return;
- }
- }
- //
- // Initialize the serial port before dumping.
- //
- SerialPortInitialize ();
- //
- // Display ExceptionType, CPU information and Image information
- //
- DumpImageAndCpuContent (ExceptionType, SystemContext);
- //
- // Enter a dead loop.
- //
- CpuDeadLoop ();
- }
- /**
- Initializes all CPU exceptions entries and provides the default exception handlers.
- Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
- persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
- If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
- If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
- Note: Before invoking this API, caller must allocate memory for IDT table and load
- IDTR by AsmWriteIdtr().
- @param[in] VectorInfo Pointer to reserved vector list.
- @retval EFI_SUCCESS CPU Exception Entries have been successfully initialized
- with default exception handlers.
- @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
- @retval EFI_UNSUPPORTED This function is not supported.
- **/
- EFI_STATUS
- EFIAPI
- InitializeCpuExceptionHandlers (
- IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL
- )
- {
- EFI_STATUS Status;
- RESERVED_VECTORS_DATA ReservedVectorData[CPU_EXCEPTION_NUM];
- IA32_DESCRIPTOR IdtDescriptor;
- UINTN IdtEntryCount;
- UINT16 CodeSegment;
- EXCEPTION_HANDLER_TEMPLATE_MAP TemplateMap;
- IA32_IDT_GATE_DESCRIPTOR *IdtTable;
- UINTN Index;
- UINTN InterruptHandler;
- if (VectorInfo != NULL) {
- SetMem ((VOID *)ReservedVectorData, sizeof (RESERVED_VECTORS_DATA) * CPU_EXCEPTION_NUM, 0xff);
- Status = ReadAndVerifyVectorInfo (VectorInfo, ReservedVectorData, CPU_EXCEPTION_NUM);
- if (EFI_ERROR (Status)) {
- return EFI_INVALID_PARAMETER;
- }
- }
- //
- // Read IDT descriptor and calculate IDT size
- //
- AsmReadIdtr (&IdtDescriptor);
- IdtEntryCount = (IdtDescriptor.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);
- if (IdtEntryCount > CPU_EXCEPTION_NUM) {
- //
- // CPU exception library only setup CPU_EXCEPTION_NUM exception handler at most
- //
- IdtEntryCount = CPU_EXCEPTION_NUM;
- }
- //
- // Use current CS as the segment selector of interrupt gate in IDT
- //
- CodeSegment = AsmReadCs ();
- AsmGetTemplateAddressMap (&TemplateMap);
- IdtTable = (IA32_IDT_GATE_DESCRIPTOR *)IdtDescriptor.Base;
- for (Index = 0; Index < IdtEntryCount; Index++) {
- IdtTable[Index].Bits.Selector = CodeSegment;
- //
- // Check reserved vectors attributes if has, only EFI_VECTOR_HANDOFF_DO_NOT_HOOK
- // supported in this instance
- //
- if (VectorInfo != NULL) {
- if (ReservedVectorData[Index].Attribute == EFI_VECTOR_HANDOFF_DO_NOT_HOOK) {
- continue;
- }
- }
- //
- // Update IDT entry
- //
- InterruptHandler = TemplateMap.ExceptionStart + Index * TemplateMap.ExceptionStubHeaderSize;
- ArchUpdateIdtEntry (&IdtTable[Index], InterruptHandler);
- }
- return EFI_SUCCESS;
- }
- /**
- Initializes all CPU interrupt/exceptions entries and provides the default interrupt/exception handlers.
- Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
- persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
- If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
- If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
- @param[in] VectorInfo Pointer to reserved vector list.
- @retval EFI_SUCCESS All CPU interrupt/exception entries have been successfully initialized
- with default interrupt/exception handlers.
- @retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
- @retval EFI_UNSUPPORTED This function is not supported.
- **/
- EFI_STATUS
- EFIAPI
- InitializeCpuInterruptHandlers (
- IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL
- )
- {
- return EFI_UNSUPPORTED;
- }
- /**
- Registers a function to be called from the processor interrupt handler.
- This function registers and enables the handler specified by InterruptHandler for a processor
- interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
- handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
- The installed handler is called once for each processor interrupt or exception.
- NOTE: This function should be invoked after InitializeCpuExceptionHandlers() or
- InitializeCpuInterruptHandlers() invoked, otherwise EFI_UNSUPPORTED returned.
- @param[in] InterruptType Defines which interrupt or exception to hook.
- @param[in] InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
- when a processor interrupt occurs. If this parameter is NULL, then the handler
- will be uninstalled.
- @retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
- @retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
- previously installed.
- @retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
- previously installed.
- @retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported,
- or this function is not supported.
- **/
- EFI_STATUS
- EFIAPI
- RegisterCpuInterruptHandler (
- IN EFI_EXCEPTION_TYPE InterruptType,
- IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
- )
- {
- return EFI_UNSUPPORTED;
- }
- /**
- Initializes all CPU exceptions entries with optional extra initializations.
- By default, this method should include all functionalities implemented by
- InitializeCpuExceptionHandlers(), plus extra initialization works, if any.
- This could be done by calling InitializeCpuExceptionHandlers() directly
- in this method besides the extra works.
- InitData is optional and its use and content are processor arch dependent.
- The typical usage of it is to convey resources which have to be reserved
- elsewhere and are necessary for the extra initializations of exception.
- @param[in] VectorInfo Pointer to reserved vector list.
- @param[in] InitData Pointer to data optional for extra initializations
- of exception.
- @retval EFI_SUCCESS The exceptions have been successfully
- initialized.
- @retval EFI_INVALID_PARAMETER VectorInfo or InitData contains invalid
- content.
- **/
- EFI_STATUS
- EFIAPI
- InitializeCpuExceptionHandlersEx (
- IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL,
- IN CPU_EXCEPTION_INIT_DATA *InitData OPTIONAL
- )
- {
- return InitializeCpuExceptionHandlers (VectorInfo);
- }
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