audk/MdeModulePkg/Core/PiSmmCore/Smi.c

334 lines
9.1 KiB
C

/** @file
SMI management.
Copyright (c) 2009 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "PiSmmCore.h"
//
// SMM_HANDLER - used for each SMM handler
//
#define SMI_ENTRY_SIGNATURE SIGNATURE_32('s','m','i','e')
typedef struct {
UINTN Signature;
LIST_ENTRY AllEntries; // All entries
EFI_GUID HandlerType; // Type of interrupt
LIST_ENTRY SmiHandlers; // All handlers
} SMI_ENTRY;
#define SMI_HANDLER_SIGNATURE SIGNATURE_32('s','m','i','h')
typedef struct {
UINTN Signature;
LIST_ENTRY Link; // Link on SMI_ENTRY.SmiHandlers
EFI_SMM_HANDLER_ENTRY_POINT2 Handler; // The smm handler's entry point
SMI_ENTRY *SmiEntry;
} SMI_HANDLER;
LIST_ENTRY mRootSmiHandlerList = INITIALIZE_LIST_HEAD_VARIABLE (mRootSmiHandlerList);
LIST_ENTRY mSmiEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mSmiEntryList);
/**
Finds the SMI entry for the requested handler type.
@param HandlerType The type of the interrupt
@param Create Create a new entry if not found
@return SMI entry
**/
SMI_ENTRY *
EFIAPI
SmmCoreFindSmiEntry (
IN EFI_GUID *HandlerType,
IN BOOLEAN Create
)
{
LIST_ENTRY *Link;
SMI_ENTRY *Item;
SMI_ENTRY *SmiEntry;
//
// Search the SMI entry list for the matching GUID
//
SmiEntry = NULL;
for (Link = mSmiEntryList.ForwardLink;
Link != &mSmiEntryList;
Link = Link->ForwardLink) {
Item = CR (Link, SMI_ENTRY, AllEntries, SMI_ENTRY_SIGNATURE);
if (CompareGuid (&Item->HandlerType, HandlerType)) {
//
// This is the SMI entry
//
SmiEntry = Item;
break;
}
}
//
// If the protocol entry was not found and Create is TRUE, then
// allocate a new entry
//
if ((SmiEntry == NULL) && Create) {
SmiEntry = AllocatePool (sizeof(SMI_ENTRY));
if (SmiEntry != NULL) {
//
// Initialize new SMI entry structure
//
SmiEntry->Signature = SMI_ENTRY_SIGNATURE;
CopyGuid ((VOID *)&SmiEntry->HandlerType, HandlerType);
InitializeListHead (&SmiEntry->SmiHandlers);
//
// Add it to SMI entry list
//
InsertTailList (&mSmiEntryList, &SmiEntry->AllEntries);
}
}
return SmiEntry;
}
/**
Manage SMI of a particular type.
@param HandlerType Points to the handler type or NULL for root SMI handlers.
@param Context Points to an optional context buffer.
@param CommBuffer Points to the optional communication buffer.
@param CommBufferSize Points to the size of the optional communication buffer.
@retval EFI_SUCCESS Interrupt source was processed successfully but not quiesced.
@retval EFI_INTERRUPT_PENDING One or more SMI sources could not be quiesced.
@retval EFI_WARN_INTERRUPT_SOURCE_PENDING Interrupt source was not handled or quiesced.
@retval EFI_WARN_INTERRUPT_SOURCE_QUIESCED Interrupt source was handled and quiesced.
**/
EFI_STATUS
EFIAPI
SmiManage (
IN CONST EFI_GUID *HandlerType,
IN CONST VOID *Context OPTIONAL,
IN OUT VOID *CommBuffer OPTIONAL,
IN OUT UINTN *CommBufferSize OPTIONAL
)
{
LIST_ENTRY *Link;
LIST_ENTRY *Head;
SMI_ENTRY *SmiEntry;
SMI_HANDLER *SmiHandler;
BOOLEAN InterruptQuiesced;
EFI_STATUS Status;
if (HandlerType == NULL) {
//
// Root SMI handler
//
Status = EFI_WARN_INTERRUPT_SOURCE_PENDING;
Head = &mRootSmiHandlerList;
for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {
SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);
Status = SmiHandler->Handler (
(EFI_HANDLE) SmiHandler,
Context,
CommBuffer,
CommBufferSize
);
if (Status == EFI_SUCCESS || Status == EFI_INTERRUPT_PENDING) {
return Status;
}
}
return Status;
}
//
// Non-root SMI handler
//
SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, FALSE);
if (SmiEntry == NULL) {
//
// There is no handler registered for this interrupt source
//
return EFI_WARN_INTERRUPT_SOURCE_PENDING;
}
InterruptQuiesced = FALSE;
Head = &SmiEntry->SmiHandlers;
for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {
SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);
Status = SmiHandler->Handler (
(EFI_HANDLE) SmiHandler,
Context,
CommBuffer,
CommBufferSize
);
switch (Status) {
case EFI_INTERRUPT_PENDING:
//
// If a handler returns EFI_INTERRUPT_PENDING, the interrupt could not be
// quiesced, then no additional handlers will be processed,
// and EFI_INTERRUPT_PENDING will be returned
//
return EFI_INTERRUPT_PENDING;
case EFI_SUCCESS:
//
// If handler return EFI_SUCCESS, the interrupt was handled and quiesced,
// no other handlers should still be called,
// and EFI_WARN_INTERRUPT_SOURCE_QUIESCED will be returned
//
return EFI_WARN_INTERRUPT_SOURCE_QUIESCED;
case EFI_WARN_INTERRUPT_SOURCE_QUIESCED:
//
// If at least one of the handlers report EFI_WARN_INTERRUPT_SOURCE_QUIESCED,
// then this function will return EFI_WARN_INTERRUPT_SOURCE_QUIESCED
//
InterruptQuiesced = TRUE;
break;
default:
break;
}
}
if (InterruptQuiesced) {
Status = EFI_WARN_INTERRUPT_SOURCE_QUIESCED;
} else {
//
// If no handler report EFI_WARN_INTERRUPT_SOURCE_QUIESCED, then this
// function will return EFI_INTERRUPT_PENDING
//
Status = EFI_INTERRUPT_PENDING;
}
return Status;
}
/**
Registers a handler to execute within SMM.
@param Handler Handler service funtion pointer.
@param HandlerType Points to the handler type or NULL for root SMI handlers.
@param DispatchHandle On return, contains a unique handle which can be used to later unregister the handler function.
@retval EFI_SUCCESS Handler register success.
@retval EFI_INVALID_PARAMETER Handler or DispatchHandle is NULL.
**/
EFI_STATUS
EFIAPI
SmiHandlerRegister (
IN EFI_SMM_HANDLER_ENTRY_POINT2 Handler,
IN CONST EFI_GUID *HandlerType OPTIONAL,
OUT EFI_HANDLE *DispatchHandle
)
{
SMI_HANDLER *SmiHandler;
SMI_ENTRY *SmiEntry;
LIST_ENTRY *List;
if (Handler == NULL || DispatchHandle == NULL) {
return EFI_INVALID_PARAMETER;
}
SmiHandler = AllocateZeroPool (sizeof (SMI_HANDLER));
if (SmiHandler == NULL) {
return EFI_OUT_OF_RESOURCES;
}
SmiHandler->Signature = SMI_HANDLER_SIGNATURE;
SmiHandler->Handler = Handler;
if (HandlerType == NULL) {
//
// This is root SMI handler
//
SmiEntry = NULL;
List = &mRootSmiHandlerList;
} else {
//
// None root SMI handler
//
SmiEntry = SmmCoreFindSmiEntry ((EFI_GUID *) HandlerType, TRUE);
if (SmiEntry == NULL) {
return EFI_OUT_OF_RESOURCES;
}
List = &SmiEntry->SmiHandlers;
}
SmiHandler->SmiEntry = SmiEntry;
InsertTailList (List, &SmiHandler->Link);
*DispatchHandle = (EFI_HANDLE) SmiHandler;
return EFI_SUCCESS;
}
/**
Unregister a handler in SMM.
@param DispatchHandle The handle that was specified when the handler was registered.
@retval EFI_SUCCESS Handler function was successfully unregistered.
@retval EFI_INVALID_PARAMETER DispatchHandle does not refer to a valid handle.
**/
EFI_STATUS
EFIAPI
SmiHandlerUnRegister (
IN EFI_HANDLE DispatchHandle
)
{
SMI_HANDLER *SmiHandler;
SMI_ENTRY *SmiEntry;
SmiHandler = (SMI_HANDLER *) DispatchHandle;
if (SmiHandler == NULL) {
return EFI_INVALID_PARAMETER;
}
if (SmiHandler->Signature != SMI_HANDLER_SIGNATURE) {
return EFI_INVALID_PARAMETER;
}
SmiEntry = SmiHandler->SmiEntry;
RemoveEntryList (&SmiHandler->Link);
FreePool (SmiHandler);
if (SmiEntry == NULL) {
//
// This is root SMI handler
//
return EFI_SUCCESS;
}
if (IsListEmpty (&SmiEntry->SmiHandlers)) {
//
// No handler registered for this interrupt now, remove the SMI_ENTRY
//
RemoveEntryList (&SmiEntry->AllEntries);
FreePool (SmiEntry);
}
return EFI_SUCCESS;
}