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audk/MdeModulePkg/Universal/EbcDxe/EbcInt.c

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/** @file
Top level module for the EBC virtual machine implementation.
Provides auxilliary support routines for the VM. That is, routines
that are not particularly related to VM execution of EBC instructions.
Copyright (c) 2006, Intel Corporation
All rights reserved. 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 "EbcInt.h"
#include "EbcExecute.h"
//
// We'll keep track of all thunks we create in a linked list. Each
// thunk is tied to an image handle, so we have a linked list of
// image handles, with each having a linked list of thunks allocated
// to that image handle.
//
typedef struct _EBC_THUNK_LIST {
VOID *ThunkBuffer;
struct _EBC_THUNK_LIST *Next;
} EBC_THUNK_LIST;
typedef struct _EBC_IMAGE_LIST {
struct _EBC_IMAGE_LIST *Next;
EFI_HANDLE ImageHandle;
EBC_THUNK_LIST *ThunkList;
} EBC_IMAGE_LIST;
STATIC
EFI_STATUS
EFIAPI
EbcUnloadImage (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle
);
STATIC
EFI_STATUS
EFIAPI
EbcCreateThunk (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle,
IN VOID *EbcEntryPoint,
OUT VOID **Thunk
);
STATIC
EFI_STATUS
EFIAPI
EbcGetVersion (
IN EFI_EBC_PROTOCOL *This,
IN OUT UINT64 *Version
);
STATIC
EFI_STATUS
EFIAPI
InitializeEbcCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This
);
STATIC
VOID
EFIAPI
CommonEbcExceptionHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_SYSTEM_CONTEXT SystemContext
);
STATIC
VOID
EFIAPI
EbcPeriodicNotifyFunction (
IN EFI_EVENT Event,
IN VOID *Context
);
STATIC
EFI_STATUS
EFIAPI
EbcDebugPeriodic (
IN VM_CONTEXT *VmPtr
);
//
// These two functions and the GUID are used to produce an EBC test protocol.
// This functionality is definitely not required for execution.
//
STATIC
EFI_STATUS
InitEbcVmTestProtocol (
IN EFI_HANDLE *Handle
);
STATIC
EFI_STATUS
EbcVmTestUnsupported (
VOID
);
STATIC
EFI_STATUS
EFIAPI
EbcRegisterICacheFlush (
IN EFI_EBC_PROTOCOL *This,
IN EBC_ICACHE_FLUSH Flush
);
STATIC
EFI_STATUS
EFIAPI
EbcDebugGetMaximumProcessorIndex (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
OUT UINTN *MaxProcessorIndex
);
STATIC
EFI_STATUS
EFIAPI
EbcDebugRegisterPeriodicCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_PERIODIC_CALLBACK PeriodicCallback
);
STATIC
EFI_STATUS
EFIAPI
EbcDebugRegisterExceptionCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_EXCEPTION_CALLBACK ExceptionCallback,
IN EFI_EXCEPTION_TYPE ExceptionType
);
STATIC
EFI_STATUS
EFIAPI
EbcDebugInvalidateInstructionCache (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN VOID *Start,
IN UINT64 Length
);
//
// We have one linked list of image handles for the whole world. Since
// there should only be one interpreter, make them global. They must
// also be global since the execution of an EBC image does not provide
// a This pointer.
//
static EBC_IMAGE_LIST *mEbcImageList = NULL;
//
// Callback function to flush the icache after thunk creation
//
static EBC_ICACHE_FLUSH mEbcICacheFlush;
//
// These get set via calls by the debug agent
//
static EFI_PERIODIC_CALLBACK mDebugPeriodicCallback = NULL;
static EFI_EXCEPTION_CALLBACK mDebugExceptionCallback[MAX_EBC_EXCEPTION + 1] = {NULL};
static EFI_GUID mEfiEbcVmTestProtocolGuid = EFI_EBC_VM_TEST_PROTOCOL_GUID;
static VOID* mStackBuffer[MAX_STACK_NUM];
static EFI_HANDLE mStackBufferIndex[MAX_STACK_NUM];
static UINTN mStackNum = 0;
//
// Event for Periodic callback
//
static EFI_EVENT mEbcPeriodicEvent;
VM_CONTEXT *mVmPtr = NULL;
/**
Initializes the VM EFI interface. Allocates memory for the VM interface
and registers the VM protocol.
@param ImageHandle EFI image handle.
@param SystemTable Pointer to the EFI system table.
@return Standard EFI status code.
**/
EFI_STATUS
EFIAPI
InitializeEbcDriver (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_EBC_PROTOCOL *EbcProtocol;
EFI_EBC_PROTOCOL *OldEbcProtocol;
EFI_STATUS Status;
EFI_DEBUG_SUPPORT_PROTOCOL *EbcDebugProtocol;
EFI_HANDLE *HandleBuffer;
UINTN NumHandles;
UINTN Index;
BOOLEAN Installed;
EbcProtocol = NULL;
EbcDebugProtocol = NULL;
//
// Allocate memory for our protocol. Then fill in the blanks.
//
EbcProtocol = AllocatePool (sizeof (EFI_EBC_PROTOCOL));
if (EbcProtocol == NULL) {
return EFI_OUT_OF_RESOURCES;
}
EbcProtocol->CreateThunk = EbcCreateThunk;
EbcProtocol->UnloadImage = EbcUnloadImage;
EbcProtocol->RegisterICacheFlush = EbcRegisterICacheFlush;
EbcProtocol->GetVersion = EbcGetVersion;
mEbcICacheFlush = NULL;
//
// Find any already-installed EBC protocols and uninstall them
//
Installed = FALSE;
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiEbcProtocolGuid,
NULL,
&NumHandles,
&HandleBuffer
);
if (Status == EFI_SUCCESS) {
//
// Loop through the handles
//
for (Index = 0; Index < NumHandles; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
(VOID **) &OldEbcProtocol
);
if (Status == EFI_SUCCESS) {
if (gBS->ReinstallProtocolInterface (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
OldEbcProtocol,
EbcProtocol
) == EFI_SUCCESS) {
Installed = TRUE;
}
}
}
}
if (HandleBuffer != NULL) {
FreePool (HandleBuffer);
HandleBuffer = NULL;
}
//
// Add the protocol so someone can locate us if we haven't already.
//
if (!Installed) {
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gEfiEbcProtocolGuid,
EFI_NATIVE_INTERFACE,
EbcProtocol
);
if (EFI_ERROR (Status)) {
FreePool (EbcProtocol);
return Status;
}
}
Status = InitEBCStack();
if (EFI_ERROR(Status)) {
goto ErrorExit;
}
//
// Allocate memory for our debug protocol. Then fill in the blanks.
//
EbcDebugProtocol = AllocatePool (sizeof (EFI_DEBUG_SUPPORT_PROTOCOL));
if (EbcDebugProtocol == NULL) {
goto ErrorExit;
}
EbcDebugProtocol->Isa = IsaEbc;
EbcDebugProtocol->GetMaximumProcessorIndex = EbcDebugGetMaximumProcessorIndex;
EbcDebugProtocol->RegisterPeriodicCallback = EbcDebugRegisterPeriodicCallback;
EbcDebugProtocol->RegisterExceptionCallback = EbcDebugRegisterExceptionCallback;
EbcDebugProtocol->InvalidateInstructionCache = EbcDebugInvalidateInstructionCache;
//
// Add the protocol so the debug agent can find us
//
Status = gBS->InstallProtocolInterface (
&ImageHandle,
&gEfiDebugSupportProtocolGuid,
EFI_NATIVE_INTERFACE,
EbcDebugProtocol
);
//
// This is recoverable, so free the memory and continue.
//
if (EFI_ERROR (Status)) {
FreePool (EbcDebugProtocol);
goto ErrorExit;
}
//
// Install EbcDebugSupport Protocol Successfully
// Now we need to initialize the Ebc default Callback
//
Status = InitializeEbcCallback (EbcDebugProtocol);
//
// Produce a VM test interface protocol. Not required for execution.
//
DEBUG_CODE_BEGIN ();
InitEbcVmTestProtocol (&ImageHandle);
DEBUG_CODE_END ();
return EFI_SUCCESS;
ErrorExit:
FreeEBCStack();
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiEbcProtocolGuid,
NULL,
&NumHandles,
&HandleBuffer
);
if (Status == EFI_SUCCESS) {
//
// Loop through the handles
//
for (Index = 0; Index < NumHandles; Index++) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
(VOID **) &OldEbcProtocol
);
if (Status == EFI_SUCCESS) {
gBS->UninstallProtocolInterface (
HandleBuffer[Index],
&gEfiEbcProtocolGuid,
OldEbcProtocol
);
}
}
}
if (HandleBuffer != NULL) {
FreePool (HandleBuffer);
HandleBuffer = NULL;
}
FreePool (EbcProtocol);
return Status;
}
/**
This is the top-level routine plugged into the EBC protocol. Since thunks
are very processor-specific, from here we dispatch directly to the very
processor-specific routine EbcCreateThunks().
@param This protocol instance pointer
@param ImageHandle handle to the image. The EBC interpreter may use
this to keep track of any resource allocations
performed in loading and executing the image.
@param EbcEntryPoint the entry point for the image (as defined in the
file header)
@param Thunk pointer to thunk pointer where the address of the
created thunk is returned.
@return EFI_STATUS
**/
STATIC
EFI_STATUS
EFIAPI
EbcCreateThunk (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle,
IN VOID *EbcEntryPoint,
OUT VOID **Thunk
)
{
EFI_STATUS Status;
Status = EbcCreateThunks (
ImageHandle,
EbcEntryPoint,
Thunk,
FLAG_THUNK_ENTRY_POINT
);
return Status;
}
/**
This EBC debugger protocol service is called by the debug agent
@param This pointer to the caller's debug support protocol
interface
@param MaxProcessorIndex pointer to a caller allocated UINTN in which the
maximum processor index is returned.
@return Standard EFI_STATUS
**/
STATIC
EFI_STATUS
EFIAPI
EbcDebugGetMaximumProcessorIndex (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
OUT UINTN *MaxProcessorIndex
)
{
*MaxProcessorIndex = 0;
return EFI_SUCCESS;
}
/**
This protocol service is called by the debug agent to register a function
for us to call on a periodic basis.
@param This pointer to the caller's debug support protocol
interface
@param PeriodicCallback pointer to the function to call periodically
@return Always EFI_SUCCESS
**/
STATIC
EFI_STATUS
EFIAPI
EbcDebugRegisterPeriodicCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_PERIODIC_CALLBACK PeriodicCallback
)
{
if ((mDebugPeriodicCallback == NULL) && (PeriodicCallback == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((mDebugPeriodicCallback != NULL) && (PeriodicCallback != NULL)) {
return EFI_ALREADY_STARTED;
}
mDebugPeriodicCallback = PeriodicCallback;
return EFI_SUCCESS;
}
/**
This protocol service is called by the debug agent to register a function
for us to call when we detect an exception.
@param This pointer to the caller's debug support protocol
interface
@param ExceptionCallback pointer to the function to the exception
@return Always EFI_SUCCESS
**/
STATIC
EFI_STATUS
EFIAPI
EbcDebugRegisterExceptionCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN EFI_EXCEPTION_CALLBACK ExceptionCallback,
IN EFI_EXCEPTION_TYPE ExceptionType
)
{
if ((ExceptionType < 0) || (ExceptionType > MAX_EBC_EXCEPTION)) {
return EFI_INVALID_PARAMETER;
}
if ((mDebugExceptionCallback[ExceptionType] == NULL) && (ExceptionCallback == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((mDebugExceptionCallback[ExceptionType] != NULL) && (ExceptionCallback != NULL)) {
return EFI_ALREADY_STARTED;
}
mDebugExceptionCallback[ExceptionType] = ExceptionCallback;
return EFI_SUCCESS;
}
/**
This EBC debugger protocol service is called by the debug agent. Required
for DebugSupport compliance but is only stubbed out for EBC.
@return EFI_SUCCESS
**/
STATIC
EFI_STATUS
EFIAPI
EbcDebugInvalidateInstructionCache (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This,
IN UINTN ProcessorIndex,
IN VOID *Start,
IN UINT64 Length
)
{
return EFI_SUCCESS;
}
/**
The VM interpreter calls this function when an exception is detected.
@param VmPtr pointer to a VM context for passing info to the
EFI debugger.
@return EFI_SUCCESS if it returns at all
**/
EFI_STATUS
EbcDebugSignalException (
IN EFI_EXCEPTION_TYPE ExceptionType,
IN EXCEPTION_FLAGS ExceptionFlags,
IN VM_CONTEXT *VmPtr
)
{
EFI_SYSTEM_CONTEXT_EBC EbcContext;
EFI_SYSTEM_CONTEXT SystemContext;
ASSERT ((ExceptionType >= 0) && (ExceptionType <= MAX_EBC_EXCEPTION));
//
// Save the exception in the context passed in
//
VmPtr->ExceptionFlags |= ExceptionFlags;
VmPtr->LastException = ExceptionType;
//
// If it's a fatal exception, then flag it in the VM context in case an
// attached debugger tries to return from it.
//
if (ExceptionFlags & EXCEPTION_FLAG_FATAL) {
VmPtr->StopFlags |= STOPFLAG_APP_DONE;
}
//
// If someone's registered for exception callbacks, then call them.
//
// EBC driver will register default exception callback to report the
// status code via the status code API
//
if (mDebugExceptionCallback[ExceptionType] != NULL) {
//
// Initialize the context structure
//
EbcContext.R0 = VmPtr->R[0];
EbcContext.R1 = VmPtr->R[1];
EbcContext.R2 = VmPtr->R[2];
EbcContext.R3 = VmPtr->R[3];
EbcContext.R4 = VmPtr->R[4];
EbcContext.R5 = VmPtr->R[5];
EbcContext.R6 = VmPtr->R[6];
EbcContext.R7 = VmPtr->R[7];
EbcContext.Ip = (UINT64)(UINTN)VmPtr->Ip;
EbcContext.Flags = VmPtr->Flags;
EbcContext.ControlFlags = 0;
SystemContext.SystemContextEbc = &EbcContext;
mDebugExceptionCallback[ExceptionType] (ExceptionType, SystemContext);
//
// Restore the context structure and continue to execute
//
VmPtr->R[0] = EbcContext.R0;
VmPtr->R[1] = EbcContext.R1;
VmPtr->R[2] = EbcContext.R2;
VmPtr->R[3] = EbcContext.R3;
VmPtr->R[4] = EbcContext.R4;
VmPtr->R[5] = EbcContext.R5;
VmPtr->R[6] = EbcContext.R6;
VmPtr->R[7] = EbcContext.R7;
VmPtr->Ip = (VMIP)(UINTN)EbcContext.Ip;
VmPtr->Flags = EbcContext.Flags;
}
return EFI_SUCCESS;
}
/**
To install default Callback function for the VM interpreter.
@param This pointer to the instance of DebugSupport protocol
@return None
**/
STATIC
EFI_STATUS
InitializeEbcCallback (
IN EFI_DEBUG_SUPPORT_PROTOCOL *This
)
{
INTN Index;
EFI_STATUS Status;
//
// For ExceptionCallback
//
for (Index = 0; Index <= MAX_EBC_EXCEPTION; Index++) {
EbcDebugRegisterExceptionCallback (
This,
0,
CommonEbcExceptionHandler,
Index
);
}
//
// For PeriodicCallback
//
Status = gBS->CreateEvent (
EVT_TIMER | EVT_NOTIFY_SIGNAL,
TPL_NOTIFY,
EbcPeriodicNotifyFunction,
&mVmPtr,
&mEbcPeriodicEvent
);
if (EFI_ERROR(Status)) {
return Status;
}
Status = gBS->SetTimer (
mEbcPeriodicEvent,
TimerPeriodic,
EBC_VM_PERIODIC_CALLBACK_RATE
);
if (EFI_ERROR(Status)) {
return Status;
}
return EFI_SUCCESS;
}
/**
The default Exception Callback for the VM interpreter.
In this function, we report status code, and print debug information
about EBC_CONTEXT, then dead loop.
@param InterruptType Interrupt type.
@param SystemContext EBC system context.
@return None
**/
STATIC
VOID
CommonEbcExceptionHandler (
IN EFI_EXCEPTION_TYPE InterruptType,
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
//
// We deadloop here to make it easy to debug this issue.
//
ASSERT (FALSE);
return ;
}
/**
The periodic callback function for EBC VM interpreter, which is used
to support the EFI debug support protocol.
@param Event The Periodic Callback Event.
@param Context It should be the address of VM_CONTEXT pointer.
@return None.
**/
STATIC
VOID
EFIAPI
EbcPeriodicNotifyFunction (
IN EFI_EVENT Event,
IN VOID *Context
)
{
VM_CONTEXT *VmPtr;
VmPtr = *(VM_CONTEXT **)Context;
if (VmPtr != NULL) {
EbcDebugPeriodic (VmPtr);
}
return ;
}
/**
The VM interpreter calls this function on a periodic basis to support
the EFI debug support protocol.
@param VmPtr pointer to a VM context for passing info to the
debugger.
@return Standard EFI status.
**/
STATIC
EFI_STATUS
EbcDebugPeriodic (
IN VM_CONTEXT *VmPtr
)
{
EFI_SYSTEM_CONTEXT_EBC EbcContext;
EFI_SYSTEM_CONTEXT SystemContext;
//
// If someone's registered for periodic callbacks, then call them.
//
if (mDebugPeriodicCallback != NULL) {
//
// Initialize the context structure
//
EbcContext.R0 = VmPtr->R[0];
EbcContext.R1 = VmPtr->R[1];
EbcContext.R2 = VmPtr->R[2];
EbcContext.R3 = VmPtr->R[3];
EbcContext.R4 = VmPtr->R[4];
EbcContext.R5 = VmPtr->R[5];
EbcContext.R6 = VmPtr->R[6];
EbcContext.R7 = VmPtr->R[7];
EbcContext.Ip = (UINT64)(UINTN)VmPtr->Ip;
EbcContext.Flags = VmPtr->Flags;
EbcContext.ControlFlags = 0;
SystemContext.SystemContextEbc = &EbcContext;
mDebugPeriodicCallback (SystemContext);
//
// Restore the context structure and continue to execute
//
VmPtr->R[0] = EbcContext.R0;
VmPtr->R[1] = EbcContext.R1;
VmPtr->R[2] = EbcContext.R2;
VmPtr->R[3] = EbcContext.R3;
VmPtr->R[4] = EbcContext.R4;
VmPtr->R[5] = EbcContext.R5;
VmPtr->R[6] = EbcContext.R6;
VmPtr->R[7] = EbcContext.R7;
VmPtr->Ip = (VMIP)(UINTN)EbcContext.Ip;
VmPtr->Flags = EbcContext.Flags;
}
return EFI_SUCCESS;
}
/**
This routine is called by the core when an image is being unloaded from
memory. Basically we now have the opportunity to do any necessary cleanup.
Typically this will include freeing any memory allocated for thunk-creation.
@param This protocol instance pointer
@param ImageHandle handle to the image being unloaded.
@retval EFI_INVALID_PARAMETER the ImageHandle passed in was not found in the
internal list of EBC image handles.
@retval EFI_STATUS completed successfully
**/
STATIC
EFI_STATUS
EFIAPI
EbcUnloadImage (
IN EFI_EBC_PROTOCOL *This,
IN EFI_HANDLE ImageHandle
)
{
EBC_THUNK_LIST *ThunkList;
EBC_THUNK_LIST *NextThunkList;
EBC_IMAGE_LIST *ImageList;
EBC_IMAGE_LIST *PrevImageList;
//
// First go through our list of known image handles and see if we've already
// created an image list element for this image handle.
//
ReturnEBCStackByHandle(ImageHandle);
PrevImageList = NULL;
for (ImageList = mEbcImageList; ImageList != NULL; ImageList = ImageList->Next) {
if (ImageList->ImageHandle == ImageHandle) {
break;
}
//
// Save the previous so we can connect the lists when we remove this one
//
PrevImageList = ImageList;
}
if (ImageList == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Free up all the thunk buffers and thunks list elements for this image
// handle.
//
ThunkList = ImageList->ThunkList;
while (ThunkList != NULL) {
NextThunkList = ThunkList->Next;
FreePool (ThunkList->ThunkBuffer);
FreePool (ThunkList);
ThunkList = NextThunkList;
}
//
// Now remove this image list element from the chain
//
if (PrevImageList == NULL) {
//
// Remove from head
//
mEbcImageList = ImageList->Next;
} else {
PrevImageList->Next = ImageList->Next;
}
//
// Now free up the image list element
//
FreePool (ImageList);
return EFI_SUCCESS;
}
/**
Add a thunk to our list of thunks for a given image handle.
Also flush the instruction cache since we've written thunk code
to memory that will be executed eventually.
@param ImageHandle the image handle to which the thunk is tied
@param ThunkBuffer the buffer we've created/allocated
@param ThunkSize the size of the thunk memory allocated
@retval EFI_OUT_OF_RESOURCES memory allocation failed
@retval EFI_SUCCESS successful completion
**/
EFI_STATUS
EbcAddImageThunk (
IN EFI_HANDLE ImageHandle,
IN VOID *ThunkBuffer,
IN UINT32 ThunkSize
)
{
EBC_THUNK_LIST *ThunkList;
EBC_IMAGE_LIST *ImageList;
EFI_STATUS Status;
//
// It so far so good, then flush the instruction cache
//
if (mEbcICacheFlush != NULL) {
Status = mEbcICacheFlush ((EFI_PHYSICAL_ADDRESS) (UINTN) ThunkBuffer, ThunkSize);
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// Go through our list of known image handles and see if we've already
// created a image list element for this image handle.
//
for (ImageList = mEbcImageList; ImageList != NULL; ImageList = ImageList->Next) {
if (ImageList->ImageHandle == ImageHandle) {
break;
}
}
if (ImageList == NULL) {
//
// Allocate a new one
//
ImageList = AllocatePool (sizeof (EBC_IMAGE_LIST));
if (ImageList == NULL) {
return EFI_OUT_OF_RESOURCES;
}
ImageList->ThunkList = NULL;
ImageList->ImageHandle = ImageHandle;
ImageList->Next = mEbcImageList;
mEbcImageList = ImageList;
}
//
// Ok, now create a new thunk element to add to the list
//
ThunkList = AllocatePool (sizeof (EBC_THUNK_LIST));
if (ThunkList == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Add it to the head of the list
//
ThunkList->Next = ImageList->ThunkList;
ThunkList->ThunkBuffer = ThunkBuffer;
ImageList->ThunkList = ThunkList;
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
EFIAPI
EbcRegisterICacheFlush (
IN EFI_EBC_PROTOCOL *This,
IN EBC_ICACHE_FLUSH Flush
)
{
mEbcICacheFlush = Flush;
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
EFIAPI
EbcGetVersion (
IN EFI_EBC_PROTOCOL *This,
IN OUT UINT64 *Version
)
{
if (Version == NULL) {
return EFI_INVALID_PARAMETER;
}
*Version = GetVmVersion ();
return EFI_SUCCESS;
}
EFI_STATUS
GetEBCStack(
EFI_HANDLE Handle,
VOID **StackBuffer,
UINTN *BufferIndex
)
{
UINTN Index;
EFI_TPL OldTpl;
OldTpl = gBS->RaiseTPL(TPL_HIGH_LEVEL);
for (Index = 0; Index < mStackNum; Index ++) {
if (mStackBufferIndex[Index] == NULL) {
mStackBufferIndex[Index] = Handle;
break;
}
}
gBS->RestoreTPL(OldTpl);
if (Index == mStackNum) {
return EFI_OUT_OF_RESOURCES;
}
*BufferIndex = Index;
*StackBuffer = mStackBuffer[Index];
return EFI_SUCCESS;
}
EFI_STATUS
ReturnEBCStack(
UINTN Index
)
{
mStackBufferIndex[Index] =NULL;
return EFI_SUCCESS;
}
EFI_STATUS
ReturnEBCStackByHandle(
EFI_HANDLE Handle
)
{
UINTN Index;
for (Index = 0; Index < mStackNum; Index ++) {
if (mStackBufferIndex[Index] == Handle) {
break;
}
}
if (Index == mStackNum) {
return EFI_NOT_FOUND;
}
mStackBufferIndex[Index] = NULL;
return EFI_SUCCESS;
}
EFI_STATUS
InitEBCStack (
VOID
)
{
for (mStackNum = 0; mStackNum < MAX_STACK_NUM; mStackNum ++) {
mStackBuffer[mStackNum] = AllocatePool(STACK_POOL_SIZE);
mStackBufferIndex[mStackNum] = NULL;
if (mStackBuffer[mStackNum] == NULL) {
break;
}
}
if (mStackNum == 0) {
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
EFI_STATUS
FreeEBCStack(
VOID
)
{
UINTN Index;
for (Index = 0; Index < mStackNum; Index ++) {
FreePool(mStackBuffer[Index]);
}
return EFI_SUCCESS;
}
/**
Produce an EBC VM test protocol that can be used for regression tests.
@param IHandle handle on which to install the protocol.
@retval EFI_OUT_OF_RESOURCES memory allocation failed
@retval EFI_SUCCESS successful completion
**/
STATIC
EFI_STATUS
InitEbcVmTestProtocol (
IN EFI_HANDLE *IHandle
)
{
EFI_HANDLE Handle;
EFI_STATUS Status;
EFI_EBC_VM_TEST_PROTOCOL *EbcVmTestProtocol;
//
// Allocate memory for the protocol, then fill in the fields
//
EbcVmTestProtocol = AllocatePool (sizeof (EFI_EBC_VM_TEST_PROTOCOL));
if (EbcVmTestProtocol == NULL) {
return EFI_OUT_OF_RESOURCES;
}
EbcVmTestProtocol->Execute = (EBC_VM_TEST_EXECUTE) EbcExecuteInstructions;
DEBUG_CODE_BEGIN ();
EbcVmTestProtocol->Assemble = (EBC_VM_TEST_ASM) EbcVmTestUnsupported;
EbcVmTestProtocol->Disassemble = (EBC_VM_TEST_DASM) EbcVmTestUnsupported;
DEBUG_CODE_END ();
//
// Publish the protocol
//
Handle = NULL;
Status = gBS->InstallProtocolInterface (&Handle, &mEfiEbcVmTestProtocolGuid, EFI_NATIVE_INTERFACE, EbcVmTestProtocol);
if (EFI_ERROR (Status)) {
FreePool (EbcVmTestProtocol);
}
return Status;
}
STATIC
EFI_STATUS
EbcVmTestUnsupported ()
{
return EFI_UNSUPPORTED;
}
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