/** @file DxeExceptionLib.c | |
LoongArch exception library implemenation for DXE modules. | |
Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <Library/BaseLib.h> | |
#include <Library/CpuExceptionHandlerLib.h> | |
#include <Library/CpuLib.h> | |
#include <Library/CacheMaintenanceLib.h> | |
#include <Library/DebugLib.h> | |
#include <Library/SerialPortLib.h> | |
#include <Protocol/DebugSupport.h> | |
#include <Register/LoongArch64/Csr.h> | |
#include "ExceptionCommon.h" | |
EFI_EXCEPTION_CALLBACK ExternalInterruptHandler[MAX_LOONGARCH_INTERRUPT + 1] = { 0 }; | |
EFI_EXCEPTION_CALLBACK ExceptionHandler[MAX_LOONGARCH_EXCEPTION + 1] = { 0 }; | |
/** | |
Registers a function to be called from the processor interrupt or exception 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. | |
@param InterruptType A pointer to the processor's current interrupt state. Set to TRUE if interrupts | |
are enabled and FALSE if interrupts are disabled. | |
@param 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. | |
**/ | |
EFI_STATUS | |
RegisterCpuInterruptHandler ( | |
IN EFI_EXCEPTION_TYPE InterruptType, | |
IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler | |
) | |
{ | |
EFI_EXCEPTION_TYPE ExceptionType; | |
ExceptionType = InterruptType & CSR_ESTAT_EXC; | |
if (ExceptionType != 0) { | |
// | |
// Exception >>= CSR_ESTAT_EXC_SHIFT, convert to ECODE | |
// | |
ExceptionType >>= CSR_ESTAT_EXC_SHIFT; | |
if (ExceptionType > EXCEPT_LOONGARCH_FPE) { | |
return EFI_UNSUPPORTED; | |
} | |
if ((InterruptHandler == NULL) && (ExceptionHandler[InterruptType] == NULL)) { | |
return EFI_INVALID_PARAMETER; | |
} | |
if ((InterruptHandler != NULL) && (ExceptionHandler[ExceptionType] != NULL)) { | |
return EFI_ALREADY_STARTED; | |
} | |
ExceptionHandler[ExceptionType] = InterruptHandler; | |
} else { | |
// | |
// Interrupt | |
// | |
if (InterruptType > MAX_LOONGARCH_INTERRUPT) { | |
return EFI_UNSUPPORTED; | |
} | |
if ((InterruptHandler == NULL) && (ExternalInterruptHandler[InterruptType] == NULL)) { | |
return EFI_INVALID_PARAMETER; | |
} | |
if ((InterruptHandler != NULL) && (ExternalInterruptHandler[InterruptType] != NULL)) { | |
return EFI_ALREADY_STARTED; | |
} | |
ExternalInterruptHandler[InterruptType] = InterruptHandler; | |
} | |
return EFI_SUCCESS; | |
} | |
/** | |
Common exception handler. | |
@param ExceptionType Exception type. | |
@param SystemContext Pointer to EFI_SYSTEM_CONTEXT. | |
**/ | |
VOID | |
EFIAPI | |
CommonExceptionHandler ( | |
IN EFI_EXCEPTION_TYPE ExceptionType, | |
IN OUT EFI_SYSTEM_CONTEXT SystemContext | |
) | |
{ | |
EFI_EXCEPTION_TYPE InterruptType; | |
if (ExceptionType == EXCEPT_LOONGARCH_INT) { | |
// | |
// Interrupt | |
// | |
InterruptType = GetInterruptType (SystemContext); | |
if (InterruptType == 0xFF) { | |
ExceptionType = InterruptType; | |
} else { | |
if ((ExternalInterruptHandler != NULL) && (ExternalInterruptHandler[InterruptType] != NULL)) { | |
ExternalInterruptHandler[InterruptType](InterruptType, SystemContext); | |
return; | |
} | |
} | |
} else if (ExceptionType == EXCEPT_LOONGARCH_FPD) { | |
EnableFloatingPointUnits (); | |
InitializeFloatingPointUnits (); | |
return; | |
} else { | |
// | |
// Exception | |
// | |
ExceptionType >>= CSR_ESTAT_EXC_SHIFT; | |
if ((ExceptionHandler != NULL) && (ExceptionHandler[ExceptionType] != NULL)) { | |
ExceptionHandler[ExceptionType](ExceptionType, SystemContext); | |
return; | |
} | |
} | |
// | |
// Only the TLB refill exception use the same entry point as normal exceptions. | |
// | |
if (CsrRead (LOONGARCH_CSR_TLBRERA) & 0x1) { | |
ExceptionType = mExceptionKnownNameNum - 1; // Use only to dump the exception context. | |
} | |
DefaultExceptionHandler (ExceptionType, SystemContext); | |
} | |
/** | |
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 | |
) | |
{ | |
return EFI_SUCCESS; | |
} | |
/** | |
Setup separate stacks for certain exception handlers. | |
If the input Buffer and BufferSize are both NULL, use global variable if possible. | |
@param[in] Buffer Point to buffer used to separate exception stack. | |
@param[in, out] BufferSize On input, it indicates the byte size of Buffer. | |
If the size is not enough, the return status will | |
be EFI_BUFFER_TOO_SMALL, and output BufferSize | |
will be the size it needs. | |
@retval EFI_SUCCESS The stacks are assigned successfully. | |
@retval EFI_UNSUPPORTED This function is not supported. | |
@retval EFI_BUFFER_TOO_SMALL This BufferSize is too small. | |
**/ | |
EFI_STATUS | |
EFIAPI | |
InitializeSeparateExceptionStacks ( | |
IN VOID *Buffer, | |
IN OUT UINTN *BufferSize | |
) | |
{ | |
return EFI_SUCCESS; | |
} |