/** @file
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RISC-V Exception Handler library implementition.
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Copyright (c) 2016 - 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <PiPei.h>
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#include <Library/CpuExceptionHandlerLib.h>
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#include <Library/DebugLib.h>
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#include <Library/RiscVCpuLib.h>
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#include <sbi/riscv_asm.h>
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#include <sbi/riscv_encoding.h>
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#include <sbi/sbi_types.h>
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#include "CpuExceptionHandlerLib.h"
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STATIC EFI_CPU_INTERRUPT_HANDLER mInterruptHandlers[2];
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/**
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Initializes all CPU exceptions entries and provides the default exception handlers.
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Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
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persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
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If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
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If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
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@param[in] VectorInfo Pointer to reserved vector list.
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@retval EFI_SUCCESS CPU Exception Entries have been successfully initialized
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with default exception handlers.
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@retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
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@retval EFI_UNSUPPORTED This function is not supported.
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**/
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EFI_STATUS
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EFIAPI
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InitializeCpuExceptionHandlers (
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IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL
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)
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{
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return EFI_SUCCESS;
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}
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/**
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Initializes all CPU interrupt/exceptions entries and provides the default interrupt/exception handlers.
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Caller should try to get an array of interrupt and/or exception vectors that are in use and need to
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persist by EFI_VECTOR_HANDOFF_INFO defined in PI 1.3 specification.
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If caller cannot get reserved vector list or it does not exists, set VectorInfo to NULL.
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If VectorInfo is not NULL, the exception vectors will be initialized per vector attribute accordingly.
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@param[in] VectorInfo Pointer to reserved vector list.
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@retval EFI_SUCCESS All CPU interrupt/exception entries have been successfully initialized
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with default interrupt/exception handlers.
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@retval EFI_INVALID_PARAMETER VectorInfo includes the invalid content if VectorInfo is not NULL.
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@retval EFI_UNSUPPORTED This function is not supported.
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**/
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EFI_STATUS
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EFIAPI
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InitializeCpuInterruptHandlers (
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IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL
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)
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{
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return EFI_SUCCESS;
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}
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/**
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Registers a function to be called from the processor interrupt handler.
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This function registers and enables the handler specified by InterruptHandler for a processor
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interrupt or exception type specified by InterruptType. If InterruptHandler is NULL, then the
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handler for the processor interrupt or exception type specified by InterruptType is uninstalled.
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The installed handler is called once for each processor interrupt or exception.
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NOTE: This function should be invoked after InitializeCpuExceptionHandlers() or
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InitializeCpuInterruptHandlers() invoked, otherwise EFI_UNSUPPORTED returned.
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@param[in] InterruptType Defines which interrupt or exception to hook.
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@param[in] InterruptHandler A pointer to a function of type EFI_CPU_INTERRUPT_HANDLER that is called
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when a processor interrupt occurs. If this parameter is NULL, then the handler
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will be uninstalled.
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@retval EFI_SUCCESS The handler for the processor interrupt was successfully installed or uninstalled.
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@retval EFI_ALREADY_STARTED InterruptHandler is not NULL, and a handler for InterruptType was
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previously installed.
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@retval EFI_INVALID_PARAMETER InterruptHandler is NULL, and a handler for InterruptType was not
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previously installed.
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@retval EFI_UNSUPPORTED The interrupt specified by InterruptType is not supported,
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or this function is not supported.
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**/
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EFI_STATUS
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EFIAPI
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RegisterCpuInterruptHandler (
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IN EFI_EXCEPTION_TYPE InterruptType,
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IN EFI_CPU_INTERRUPT_HANDLER InterruptHandler
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)
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{
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DEBUG ((DEBUG_INFO, "%a: Type:%x Handler: %x\n", __FUNCTION__, InterruptType, InterruptHandler));
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mInterruptHandlers[InterruptType] = InterruptHandler;
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return EFI_SUCCESS;
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}
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/**
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Machine mode trap handler.
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@param[in] SmodeTrapReg Registers before trap occurred.
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**/
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VOID
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RiscVSupervisorModeTrapHandler (
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SMODE_TRAP_REGISTERS *SmodeTrapReg
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)
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{
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UINTN SCause;
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EFI_SYSTEM_CONTEXT RiscVSystemContext;
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RiscVSystemContext.SystemContextRiscV64 = (EFI_SYSTEM_CONTEXT_RISCV64 *)SmodeTrapReg;
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//
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// Check scasue register.
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//
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SCause = (UINTN)csr_read(RISCV_CSR_SUPERVISOR_SCAUSE);
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if ((SCause & (1UL << (sizeof (UINTN) * 8- 1))) != 0) {
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//
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// This is interrupt event.
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//
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SCause &= ~(1UL << (sizeof (UINTN) * 8- 1));
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if((SCause == SCAUSE_SUPERVISOR_TIMER_INT) && (mInterruptHandlers[EXCEPT_RISCV_TIMER_INT] != NULL)) {
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mInterruptHandlers[EXCEPT_RISCV_TIMER_INT](EXCEPT_RISCV_TIMER_INT, RiscVSystemContext);
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}
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}
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}
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/**
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Initializes all CPU exceptions entries with optional extra initializations.
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By default, this method should include all functionalities implemented by
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InitializeCpuExceptionHandlers(), plus extra initialization works, if any.
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This could be done by calling InitializeCpuExceptionHandlers() directly
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in this method besides the extra works.
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InitData is optional and its use and content are processor arch dependent.
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The typical usage of it is to convey resources which have to be reserved
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elsewhere and are necessary for the extra initializations of exception.
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@param[in] VectorInfo Pointer to reserved vector list.
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@param[in] InitData Pointer to data optional for extra initializations
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of exception.
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@retval EFI_SUCCESS The exceptions have been successfully
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initialized.
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@retval EFI_INVALID_PARAMETER VectorInfo or InitData contains invalid
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content.
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@retval EFI_UNSUPPORTED This function is not supported.
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**/
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EFI_STATUS
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EFIAPI
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InitializeCpuExceptionHandlersEx (
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IN EFI_VECTOR_HANDOFF_INFO *VectorInfo OPTIONAL,
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IN CPU_EXCEPTION_INIT_DATA *InitData OPTIONAL
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)
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{
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return InitializeCpuExceptionHandlers (VectorInfo);
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}
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/**
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The constructor function to initial interrupt handlers in
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RISCV_MACHINE_MODE_CONTEXT.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The destructor completed successfully.
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@retval Other value The destructor did not complete successfully.
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**/
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EFI_STATUS
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EFIAPI
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CpuExceptionHandlerLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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//
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// Set Superviosr mode trap handler.
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//
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csr_write(CSR_STVEC, SupervisorModeTrap);
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return EFI_SUCCESS;
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}
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