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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/BaseLib.h>
- #include <Register/RiscV64/RiscVEncoding.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
- )
- {
- RiscVSetSupervisorStvec ((UINT64)SupervisorModeTrap);
- 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;
- }
- /**
- 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;
- }
- /**
- Supervisor 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)RiscVGetSupervisorTrapCause ();
- if ((SCause & (1UL << (sizeof (UINTN) * 8- 1))) != 0) {
- //
- // This is interrupt event.
- //
- SCause &= ~(1UL << (sizeof (UINTN) * 8- 1));
- if ((SCause == IRQ_S_TIMER) && (mInterruptHandlers[EXCEPT_RISCV_TIMER_INT] != NULL)) {
- mInterruptHandlers[EXCEPT_RISCV_TIMER_INT](EXCEPT_RISCV_TIMER_INT, RiscVSystemContext);
- }
- }
- }
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