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/** @file
Report Status Code Router Driver which produces SMM Report Stataus Code Handler Protocol
and SMM Status Code Protocol.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "ReportStatusCodeRouterSmm.h"
LIST_ENTRY mCallbackListHead = INITIALIZE_LIST_HEAD_VARIABLE (mCallbackListHead);
//
// Report operation nest status.
// If it is set, then the report operation has nested.
//
UINT32 mStatusCodeNestStatus = 0;
EFI_SMM_STATUS_CODE_PROTOCOL mSmmStatusCodeProtocol = {
ReportDispatcher
};
EFI_SMM_RSC_HANDLER_PROTOCOL mSmmRscHandlerProtocol = {
Register,
Unregister
};
/**
Register the callback function for ReportStatusCode() notification.
When this function is called the function pointer is added to an internal list and any future calls to
ReportStatusCode() will be forwarded to the Callback function.
@param[in] Callback A pointer to a function of type EFI_PEI_RSC_HANDLER_CALLBACK that is called
when a call to ReportStatusCode() occurs.
@retval EFI_SUCCESS Function was successfully registered.
@retval EFI_INVALID_PARAMETER The callback function was NULL.
@retval EFI_OUT_OF_RESOURCES The internal buffer ran out of space. No more functions can be
registered.
@retval EFI_ALREADY_STARTED The function was already registered. It can't be registered again.
**/
EFI_STATUS
EFIAPI
Register (
IN EFI_SMM_RSC_HANDLER_CALLBACK Callback
)
{
LIST_ENTRY *Link;
SMM_RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;
if (Callback == NULL) {
return EFI_INVALID_PARAMETER;
}
for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
CallbackEntry = CR (Link, SMM_RSC_HANDLER_CALLBACK_ENTRY, Node, SMM_RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
if (CallbackEntry->RscHandlerCallback == Callback) {
//
// If the function was already registered. It can't be registered again.
//
return EFI_ALREADY_STARTED;
}
}
CallbackEntry = (SMM_RSC_HANDLER_CALLBACK_ENTRY *)AllocatePool (sizeof (SMM_RSC_HANDLER_CALLBACK_ENTRY));
ASSERT (CallbackEntry != NULL);
CallbackEntry->Signature = SMM_RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE;
CallbackEntry->RscHandlerCallback = Callback;
InsertTailList (&mCallbackListHead, &CallbackEntry->Node);
return EFI_SUCCESS;
}
/**
Remove a previously registered callback function from the notification list.
ReportStatusCode() messages will no longer be forwarded to the Callback function.
@param[in] Callback A pointer to a function of type EFI_PEI_RSC_HANDLER_CALLBACK that is to be
unregistered.
@retval EFI_SUCCESS The function was successfully unregistered.
@retval EFI_INVALID_PARAMETER The callback function was NULL.
@retval EFI_NOT_FOUND The callback function was not found to be unregistered.
**/
EFI_STATUS
EFIAPI
Unregister (
IN EFI_SMM_RSC_HANDLER_CALLBACK Callback
)
{
LIST_ENTRY *Link;
SMM_RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;
if (Callback == NULL) {
return EFI_INVALID_PARAMETER;
}
for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link); Link = GetNextNode (&mCallbackListHead, Link)) {
CallbackEntry = CR (Link, SMM_RSC_HANDLER_CALLBACK_ENTRY, Node, SMM_RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
if (CallbackEntry->RscHandlerCallback == Callback) {
//
// If the function is found in list, delete it and return.
//
RemoveEntryList (&CallbackEntry->Node);
FreePool (CallbackEntry);
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
/**
Provides an interface that a software module can call to report a status code.
@param This EFI_SMM_STATUS_CODE_PROTOCOL instance.
@param Type Indicates the type of status code being reported.
@param Value Describes the current status of a hardware or software entity.
This included information about the class and subclass that is used to
classify the entity as well as an operation.
@param Instance The enumeration of a hardware or software entity within
the system. Valid instance numbers start with 1.
@param CallerId This optional parameter may be used to identify the caller.
This parameter allows the status code driver to apply different rules to
different callers.
@param Data This optional parameter may be used to pass additional data.
@retval EFI_SUCCESS The function completed successfully
@retval EFI_DEVICE_ERROR The function should not be completed due to a device error.
**/
EFI_STATUS
EFIAPI
ReportDispatcher (
IN CONST EFI_SMM_STATUS_CODE_PROTOCOL *This,
IN EFI_STATUS_CODE_TYPE Type,
IN EFI_STATUS_CODE_VALUE Value,
IN UINT32 Instance,
IN CONST EFI_GUID *CallerId OPTIONAL,
IN EFI_STATUS_CODE_DATA *Data OPTIONAL
)
{
LIST_ENTRY *Link;
SMM_RSC_HANDLER_CALLBACK_ENTRY *CallbackEntry;
//
// Use atom operation to avoid the reentant of report.
// If current status is not zero, then the function is reentrancy.
//
if (InterlockedCompareExchange32 (&mStatusCodeNestStatus, 0, 1) == 1) {
return EFI_DEVICE_ERROR;
}
for (Link = GetFirstNode (&mCallbackListHead); !IsNull (&mCallbackListHead, Link);) {
CallbackEntry = CR (Link, SMM_RSC_HANDLER_CALLBACK_ENTRY, Node, SMM_RSC_HANDLER_CALLBACK_ENTRY_SIGNATURE);
//
// The handler may remove itself, so get the next handler in advance.
//
Link = GetNextNode (&mCallbackListHead, Link);
CallbackEntry->RscHandlerCallback (
Type,
Value,
Instance,
(EFI_GUID*)CallerId,
Data
);
}
//
// Restore the nest status of report
//
InterlockedCompareExchange32 (&mStatusCodeNestStatus, 1, 0);
return EFI_SUCCESS;
}
/**
Entry point of Generic Status Code Driver.
This function is the entry point of SMM Status Code Router .
It produces SMM Report Stataus Code Handler and Status Code protocol.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
GenericStatusCodeSmmEntry (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_HANDLE Handle;
Handle = NULL;
//
// Install SmmRscHandler Protocol
//
Status = gSmst->SmmInstallProtocolInterface (
&Handle,
&gEfiSmmRscHandlerProtocolGuid,
EFI_NATIVE_INTERFACE,
&mSmmRscHandlerProtocol
);
ASSERT_EFI_ERROR (Status);
//
// Install SmmStatusCode Protocol
//
Status = gSmst->SmmInstallProtocolInterface (
&Handle,
&gEfiSmmStatusCodeProtocolGuid,
EFI_NATIVE_INTERFACE,
&mSmmStatusCodeProtocol
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
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