DxeExceptionLib.c File Reference

#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"

Go to the source code of this file.

Functions
EFI_STATUS	RegisterCpuInterruptHandler (IN EFI_EXCEPTION_TYPE InterruptType, IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler)
VOID EFIAPI	CommonExceptionHandler (IN EFI_EXCEPTION_TYPE ExceptionType, IN OUT EFI_SYSTEM_CONTEXT SystemContext)
EFI_STATUS EFIAPI	InitializeCpuExceptionHandlers (IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL)
EFI_STATUS EFIAPI	InitializeSeparateExceptionStacks (IN VOID *Buffer, IN OUT UINTN *BufferSize)

Variables
EFI_EXCEPTION_CALLBACK	ExternalInterruptHandler [MAX_LOONGARCH_INTERRUPT+1] = { 0 }
EFI_EXCEPTION_CALLBACK	ExceptionHandler [MAX_LOONGARCH_EXCEPTION+1] = { 0 }

Detailed Description

LoongArch exception library implemenation for DXE modules.

Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

CPU Exception Handler Library common functions.

Copyright (c) 2024, Loongson Technology Corporation Limited. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file DxeExceptionLib.c.

Function Documentation

CommonExceptionHandler()

VOID EFIAPI CommonExceptionHandler	(	IN EFI_EXCEPTION_TYPE	ExceptionType,
		IN OUT EFI_SYSTEM_CONTEXT	SystemContext
	)

Common exception handler.

Parameters

ExceptionType	Exception type.
SystemContext	Pointer to EFI_SYSTEM_CONTEXT.

Definition at line 106 of file DxeExceptionLib.c.

InitializeCpuExceptionHandlers()

EFI_STATUS EFIAPI InitializeCpuExceptionHandlers

(

IN EFI_VECTOR_HANDOFF_INFO *VectorInfo

OPTIONAL

)

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.

Parameters

[in]

VectorInfo

Pointer to reserved vector list.

Return values

EFI_SUCCESS	CPU Exception Entries have been successfully initialized with default exception handlers.
EFI_INVALID_PARAMETER	VectorInfo includes the invalid content if VectorInfo is not NULL.
EFI_UNSUPPORTED	This function is not supported.

Definition at line 169 of file DxeExceptionLib.c.

InitializeSeparateExceptionStacks()

EFI_STATUS EFIAPI InitializeSeparateExceptionStacks	(	IN VOID *	Buffer,
		IN OUT UINTN *	BufferSize
	)

Setup separate stacks for certain exception handlers. If the input Buffer and BufferSize are both NULL, use global variable if possible.

Parameters

[in]	Buffer	Point to buffer used to separate exception stack.
[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.

Return values

EFI_SUCCESS	The stacks are assigned successfully.
EFI_UNSUPPORTED	This function is not supported.
EFI_BUFFER_TOO_SMALL	This BufferSize is too small.

Definition at line 192 of file DxeExceptionLib.c.

RegisterCpuInterruptHandler()

EFI_STATUS RegisterCpuInterruptHandler	(	IN EFI_EXCEPTION_TYPE	InterruptType,
		IN EFI_CPU_INTERRUPT_HANDLER	InterruptHandler
	)

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.

Parameters

InterruptType	A pointer to the processor's current interrupt state. Set to TRUE if interrupts are enabled and FALSE if interrupts are disabled.
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.

Return values

EFI_SUCCESS	The handler for the processor interrupt was successfully installed or uninstalled.
EFI_ALREADY_STARTED	InterruptHandler is not NULL, and a handler for InterruptType was previously installed.
EFI_INVALID_PARAMETER	InterruptHandler is NULL, and a handler for InterruptType was not previously installed.
EFI_UNSUPPORTED	The interrupt specified by InterruptType is not supported.

Definition at line 47 of file DxeExceptionLib.c.

Variable Documentation

ExceptionHandler

EFI_EXCEPTION_CALLBACK ExceptionHandler[MAX_LOONGARCH_EXCEPTION+1] = { 0 }

Definition at line 22 of file DxeExceptionLib.c.

ExternalInterruptHandler

EFI_EXCEPTION_CALLBACK ExternalInterruptHandler[MAX_LOONGARCH_INTERRUPT+1] = { 0 }

Definition at line 21 of file DxeExceptionLib.c.