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- /** @file
- RISC-V Exception Handler library implementation.
- Copyright (c) 2016 - 2022, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <PiPei.h>
- #include <Library/CpuExceptionHandlerLib.h>
- #include <Library/DebugLib.h>
- #include <Library/RiscVCpuLib.h>
- #include <sbi/riscv_asm.h>
- #include <sbi/riscv_encoding.h>
- #include <sbi/sbi_types.h>
- #include "CpuExceptionHandlerLib.h"
- STATIC EFI_CPU_INTERRUPT_HANDLER mInterruptHandlers[2];
- /**
- 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;
- }
- /**
- 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_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
- )
- {
- DEBUG ((DEBUG_INFO, "%a: Type:%x Handler: %x\n", __FUNCTION__, InterruptType, InterruptHandler));
- mInterruptHandlers[InterruptType] = InterruptHandler;
- return EFI_SUCCESS;
- }
- /**
- Machine mode trap handler.
- @param[in] SmodeTrapReg Registers before trap occurred.
- **/
- VOID
- RiscVSupervisorModeTrapHandler (
- SMODE_TRAP_REGISTERS *SmodeTrapReg
- )
- {
- UINTN SCause;
- EFI_SYSTEM_CONTEXT RiscVSystemContext;
- RiscVSystemContext.SystemContextRiscV64 = (EFI_SYSTEM_CONTEXT_RISCV64 *)SmodeTrapReg;
- //
- // Check scasue register.
- //
- SCause = (UINTN)csr_read (RISCV_CSR_SUPERVISOR_SCAUSE);
- if ((SCause & (1UL << (sizeof (UINTN) * 8- 1))) != 0) {
- //
- // This is interrupt event.
- //
- SCause &= ~(1UL << (sizeof (UINTN) * 8- 1));
- if ((SCause == SCAUSE_SUPERVISOR_TIMER_INT) && (mInterruptHandlers[EXCEPT_RISCV_TIMER_INT] != NULL)) {
- mInterruptHandlers[EXCEPT_RISCV_TIMER_INT](EXCEPT_RISCV_TIMER_INT, RiscVSystemContext);
- }
- }
- }
- /**
- 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.
- @retval EFI_UNSUPPORTED This function is not supported.
- **/
- EFI_STATUS
- EFIAPI
- InitializeCpuExceptionHandlersEx (
- IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL,
- IN CPU_EXCEPTION_INIT_DATA *InitData OPTIONAL
- )
- {
- return InitializeCpuExceptionHandlers (VectorInfo);
- }
- /**
- The constructor function to initial interrupt handlers in
- RISCV_MACHINE_MODE_CONTEXT.
- @param ImageHandle The firmware allocated handle for the EFI image.
- @param SystemTable A pointer to the EFI System Table.
- @retval EFI_SUCCESS The destructor completed successfully.
- @retval Other value The destructor did not complete successfully.
- **/
- EFI_STATUS
- EFIAPI
- CpuExceptionHandlerLibConstructor (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
- {
- //
- // Set Supervisor mode trap handler.
- //
- csr_write (CSR_STVEC, SupervisorModeTrap);
- return EFI_SUCCESS;
- }
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