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/** @file
Copyright (c) 2016 HP Development Company, L.P.
Copyright (c) 2016 - 2024, Arm Limited. All rights reserved.
Copyright (c) 2021, Linaro Limited
Copyright (c) 2023, Ventana Micro System Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Base.h>
#include <Pi/PiMmCis.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Protocol/DebugSupport.h> // for EFI_SYSTEM_CONTEXT
#include <Guid/ZeroGuid.h>
#include <Guid/MmramMemoryReserve.h>
#include <StandaloneMmCpu.h>
EFI_STATUS
EFIAPI
MmFoundationEntryRegister (
IN CONST EFI_MM_CONFIGURATION_PROTOCOL *This,
IN EFI_MM_ENTRY_POINT MmEntryPoint
);
//
// On ARM platforms every event is expected to have a GUID associated with
// it. It will be used by the MM Entry point to find the handler for the
// event. It will either be populated in a EFI_MM_COMMUNICATE_HEADER by the
// caller of the event (e.g. MM_COMMUNICATE SMC) or by the CPU driver
// (e.g. during an asynchronous event). In either case, this context is
// maintained in single global variable because StandaloneMm is UP-migratable
// (which means it cannot run concurrently)
//
EFI_MM_COMMUNICATE_HEADER *gGuidedEventContext = NULL;
EFI_MM_CONFIGURATION_PROTOCOL mMmConfig = {
0,
MmFoundationEntryRegister
};
EDKII_PI_MM_CPU_DRIVER_EP_PROTOCOL mPiMmCpuDriverEpProtocol = {
PiMmStandaloneMmCpuDriverEntry
};
STATIC EFI_MM_ENTRY_POINT mMmEntryPoint = NULL;
/**
The PI Standalone MM entry point for the CPU driver.
@param [in] EventId The event Id.
@param [in] CommBufferAddr Address of the communication buffer.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER A parameter was invalid.
@retval EFI_ACCESS_DENIED Access not permitted.
@retval EFI_OUT_OF_RESOURCES Out of resources.
@retval EFI_UNSUPPORTED Operation not supported.
**/
EFI_STATUS
PiMmStandaloneMmCpuDriverEntry (
IN UINTN EventId,
IN UINTN CommBufferAddr
)
{
EFI_MM_ENTRY_CONTEXT MmEntryPointContext;
EFI_STATUS Status;
UINTN CommBufferSize;
DEBUG ((DEBUG_INFO, "Received event - 0x%x\n", EventId));
Status = EFI_SUCCESS;
// Perform parameter validation of NsCommBufferAddr
if (CommBufferAddr == (UINTN)NULL) {
return EFI_INVALID_PARAMETER;
}
if (mMmEntryPoint == NULL) {
DEBUG ((DEBUG_ERROR, "Mm Entry point Not Found\n"));
return EFI_UNSUPPORTED;
}
// Find out the size of the buffer passed
CommBufferSize = ((EFI_MM_COMMUNICATE_HEADER *)CommBufferAddr)->MessageLength +
sizeof (EFI_MM_COMMUNICATE_HEADER);
// Now that the secure world can see the normal world buffer, allocate
// memory to copy the communication buffer to the secure world.
Status = mMmst->MmAllocatePool (
EfiRuntimeServicesData,
CommBufferSize,
(VOID **)&gGuidedEventContext
);
if (EFI_ERROR (Status)) {
gGuidedEventContext = NULL;
DEBUG ((DEBUG_ERROR, "Mem alloc failed - 0x%x\n", EventId));
return Status;
}
CopyMem (gGuidedEventContext, (CONST VOID *)CommBufferAddr, CommBufferSize);
ZeroMem (&MmEntryPointContext, sizeof (EFI_MM_ENTRY_CONTEXT));
// StandaloneMm UP-migratable which means it cannot run concurrently.
// Therefore, set number of cpus as 1 and cpu number as 0.
MmEntryPointContext.CurrentlyExecutingCpu = 0;
MmEntryPointContext.NumberOfCpus = 1;
// Populate the MM system table with MP and state information
mMmst->CurrentlyExecutingCpu = 0;
mMmst->NumberOfCpus = 1;
mMmst->CpuSaveStateSize = 0;
mMmst->CpuSaveState = NULL;
mMmEntryPoint (&MmEntryPointContext);
// Free the memory allocation done earlier and reset the per-cpu context
CopyMem ((VOID *)CommBufferAddr, (CONST VOID *)gGuidedEventContext, CommBufferSize);
Status = mMmst->MmFreePool ((VOID *)gGuidedEventContext);
ASSERT_EFI_ERROR (Status);
gGuidedEventContext = NULL;
return Status;
}
/**
Registers the MM foundation entry point.
@param [in] This Pointer to the MM Configuration protocol.
@param [in] MmEntryPoint Function pointer to the MM Entry point.
@retval EFI_SUCCESS Success.
**/
EFI_STATUS
EFIAPI
MmFoundationEntryRegister (
IN CONST EFI_MM_CONFIGURATION_PROTOCOL *This,
IN EFI_MM_ENTRY_POINT MmEntryPoint
)
{
// store the entry point in a global
mMmEntryPoint = MmEntryPoint;
return EFI_SUCCESS;
}
/**
This function is the main entry point for an MM handler dispatch
or communicate-based callback.
@param DispatchHandle The unique handle assigned to this handler by
MmiHandlerRegister().
@param Context Points to an optional handler context which was
specified when the handler was registered.
@param CommBuffer A pointer to a collection of data in memory that will
be conveyed from a non-MM environment into an
MM environment.
@param CommBufferSize The size of the CommBuffer.
@return Status Code
**/
EFI_STATUS
EFIAPI
PiMmCpuTpFwRootMmiHandler (
IN EFI_HANDLE DispatchHandle,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
EFI_STATUS Status;
ASSERT (Context == NULL);
ASSERT (CommBuffer == NULL);
ASSERT (CommBufferSize == NULL);
if (gGuidedEventContext == NULL) {
return EFI_NOT_FOUND;
}
DEBUG ((
DEBUG_INFO,
"CommBuffer - 0x%x, CommBufferSize - 0x%x\n",
gGuidedEventContext,
gGuidedEventContext->MessageLength
));
Status = mMmst->MmiManage (
&gGuidedEventContext->HeaderGuid,
NULL,
gGuidedEventContext->Data,
&gGuidedEventContext->MessageLength
);
if (Status != EFI_SUCCESS) {
DEBUG ((DEBUG_WARN, "Unable to manage Guided Event - %d\n", Status));
}
return Status;
}
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