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/** @file
CPU exception handler library implemenation for DXE modules.
Copyright (c) 2013 - 2016, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <PiDxe.h>
#include "CpuExceptionCommon.h"
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
CONST UINTN mDoFarReturnFlag = 0;
extern SPIN_LOCK mDisplayMessageSpinLock;
extern EFI_CPU_INTERRUPT_HANDLER *mExternalInterruptHandler;
extern RESERVED_VECTORS_DATA mReservedVectorsData[CPU_EXCEPTION_NUM];
extern EFI_CPU_INTERRUPT_HANDLER mExternalInterruptHandlerTable[CPU_EXCEPTION_NUM];
EXCEPTION_HANDLER_DATA mExceptionHandlerData;
/**
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.
@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
)
{
mExceptionHandlerData.ReservedVectors = mReservedVectorsData;
mExceptionHandlerData.ExternalInterruptHandler = mExternalInterruptHandlerTable;
InitializeSpinLock (&mExceptionHandlerData.DisplayMessageSpinLock);
return InitializeCpuExceptionHandlersWorker (VectorInfo, &mExceptionHandlerData);
}
/**
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
)
{
EFI_STATUS Status;
IA32_IDT_GATE_DESCRIPTOR *IdtTable;
IA32_DESCRIPTOR IdtDescriptor;
UINTN IdtEntryCount;
EXCEPTION_HANDLER_TEMPLATE_MAP TemplateMap;
UINTN Index;
UINTN InterruptEntry;
UINT8 *InterruptEntryCode;
mReservedVectors = AllocatePool (sizeof (RESERVED_VECTORS_DATA) * CPU_INTERRUPT_NUM);
ASSERT (mReservedVectors != NULL);
SetMem ((VOID *) mReservedVectors, sizeof (RESERVED_VECTORS_DATA) * CPU_INTERRUPT_NUM, 0xff);
if (VectorInfo != NULL) {
Status = ReadAndVerifyVectorInfo (VectorInfo, mReservedVectors, CPU_INTERRUPT_NUM);
if (EFI_ERROR (Status)) {
FreePool (mReservedVectors);
return EFI_INVALID_PARAMETER;
}
}
InitializeSpinLock (&mDisplayMessageSpinLock);
mExternalInterruptHandler = AllocateZeroPool (sizeof (EFI_CPU_INTERRUPT_HANDLER) * CPU_INTERRUPT_NUM);
ASSERT (mExternalInterruptHandler != NULL);
//
// Read IDT descriptor and calculate IDT size
//
AsmReadIdtr (&IdtDescriptor);
IdtEntryCount = (IdtDescriptor.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR);
if (IdtEntryCount > CPU_INTERRUPT_NUM) {
IdtEntryCount = CPU_INTERRUPT_NUM;
}
//
// Create Interrupt Descriptor Table and Copy the old IDT table in
//
IdtTable = AllocateZeroPool (sizeof (IA32_IDT_GATE_DESCRIPTOR) * CPU_INTERRUPT_NUM);
ASSERT (IdtTable != NULL);
CopyMem (IdtTable, (VOID *)IdtDescriptor.Base, sizeof (IA32_IDT_GATE_DESCRIPTOR) * IdtEntryCount);
AsmGetTemplateAddressMap (&TemplateMap);
ASSERT (TemplateMap.ExceptionStubHeaderSize <= HOOKAFTER_STUB_SIZE);
InterruptEntryCode = AllocatePool (TemplateMap.ExceptionStubHeaderSize * CPU_INTERRUPT_NUM);
ASSERT (InterruptEntryCode != NULL);
InterruptEntry = (UINTN) InterruptEntryCode;
for (Index = 0; Index < CPU_INTERRUPT_NUM; Index ++) {
CopyMem (
(VOID *) InterruptEntry,
(VOID *) TemplateMap.ExceptionStart,
TemplateMap.ExceptionStubHeaderSize
);
AsmVectorNumFixup ((VOID *) InterruptEntry, (UINT8) Index, (VOID *) TemplateMap.ExceptionStart);
InterruptEntry += TemplateMap.ExceptionStubHeaderSize;
}
TemplateMap.ExceptionStart = (UINTN) InterruptEntryCode;
UpdateIdtTable (IdtTable, &TemplateMap, CPU_INTERRUPT_NUM);
//
// Load Interrupt Descriptor Table
//
IdtDescriptor.Base = (UINTN) IdtTable;
IdtDescriptor.Limit = (UINT16) (sizeof (IA32_IDT_GATE_DESCRIPTOR) * CPU_INTERRUPT_NUM - 1);
AsmWriteIdtr ((IA32_DESCRIPTOR *) &IdtDescriptor);
return EFI_SUCCESS;
}
/**
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 RegisterCpuInterruptHandlerWorker (InterruptType, InterruptHandler);
}
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