EfiRuntimeLib/Ipf/RuntimeLib.c

/*++

Copyright (c) 2004 - 2012, 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.

Module Name:

  RuntimeLib.c

Abstract:

  Light weight lib to support Tiano Sal drivers.

--*/

#include "Tiano.h"
#include "EfiRuntimeLib.h"
#include EFI_PROTOCOL_DEFINITION (ExtendedSalBootService)
#include EFI_PROTOCOL_DEFINITION (ExtendedSalGuid)
#include "IpfDefines.h"
#include "SalApi.h"

//
// Worker functions in EsalLib.s
//
SAL_RETURN_REGS
GetEsalEntryPoint (
  VOID
  );

SAL_RETURN_REGS
SetEsalPhysicalEntryPoint (
  IN  UINT64  EntryPoint,
  IN  UINT64  Gp
  );

SAL_RETURN_REGS
SetEsalVirtualEntryPoint (
  IN  UINT64  EntryPoint,
  IN  UINT64  Gp
  );

VOID
SalFlushCache (
  IN EFI_PHYSICAL_ADDRESS  Start,
  IN UINT64                Length
  );

//
// Module Globals. It's not valid to use these after the
// EfiRuntimeLibVirtualNotifyEvent has fired.
//
static EFI_EVENT                          mEfiVirtualNotifyEvent;
static EFI_RUNTIME_SERVICES               *mRT;
static EFI_PLABEL                         mPlabel;
static EXTENDED_SAL_BOOT_SERVICE_PROTOCOL *mEsalBootService;
static BOOLEAN                            mRuntimeLibInitialized = FALSE;

VOID
EFIAPI
EfiRuntimeLibVirtualNotifyEvent (
  IN EFI_EVENT        Event,
  IN VOID             *Context
  )
/*++

Routine Description:

  Fixup internal data so that EFI and SAL can be call in virtual mode.
  Call the passed in Child Notify event and convert any pointers in
  lib to virtual mode.

Arguments:

  Event   - The Event that is being processed

  Context - Event Context

Returns:

  None

--*/
{
  EFI_EVENT_NOTIFY  ChildNotify;

  if (Context != NULL) {
    //
    // Call child event
    //
    ChildNotify = (EFI_EVENT_NOTIFY) (UINTN) Context;
    ChildNotify (Event, NULL);
  }

  mRT->ConvertPointer (EFI_INTERNAL_POINTER, (VOID **) &mPlabel.EntryPoint);
  mRT->ConvertPointer (EFI_INTERNAL_POINTER | EFI_IPF_GP_POINTER, (VOID **) &mPlabel.GP);

  SetEsalVirtualEntryPoint (mPlabel.EntryPoint, mPlabel.GP);

  //
  // Clear out BootService globals
  //
  gBS = NULL;
  gST = NULL;
  mRT = NULL;

  //
  // Pointers don't work you must use a direct lib call
  //
}

EFI_STATUS
EfiInitializeRuntimeDriverLib (
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable,
  IN EFI_EVENT_NOTIFY     GoVirtualChildEvent
  )
/*++

Routine Description:

  Intialize runtime Driver Lib if it has not yet been initialized.

Arguments:

  ImageHandle     - The firmware allocated handle for the EFI image.

  SystemTable     - A pointer to the EFI System Table.

  GoVirtualChildEvent - Caller can register a virtual notification event.

Returns:

  EFI_STATUS always returns EFI_SUCCESS except EFI_ALREADY_STARTED if already started.

--*/
{
  EFI_STATUS  Status;
  EFI_PLABEL  *Plabel;

  if (mRuntimeLibInitialized) {
    return EFI_ALREADY_STARTED;
  }

  mRuntimeLibInitialized  = TRUE;

  gST                     = SystemTable;
  gBS                     = SystemTable->BootServices;
  mRT                     = SystemTable->RuntimeServices;
  Status                  = EfiLibGetSystemConfigurationTable (&gEfiDxeServicesTableGuid, (VOID **) &gDS);
  ASSERT_EFI_ERROR (Status);

  //
  // The protocol contains a function pointer, which is an indirect procedure call.
  // An indirect procedure call goes through a plabel, and pointer to a function is
  // a pointer to a plabel. To implement indirect procedure calls that can work in
  // both physical and virtual mode, two plabels are required (one physical and one
  // virtual). So lets grap the physical PLABEL for the EsalEntryPoint and store it
  // away. We cache it in a module global, so we can register the vitrual version.
  //
  Status = gBS->LocateProtocol (&gEfiExtendedSalBootServiceProtocolGuid, NULL, (VOID **) &mEsalBootService);
  ASSERT_EFI_ERROR (Status);

  Plabel              = (EFI_PLABEL *) (UINTN) mEsalBootService->ExtendedSalProc;

  mPlabel.EntryPoint  = Plabel->EntryPoint;
  mPlabel.GP          = Plabel->GP;

  SetEsalPhysicalEntryPoint (mPlabel.EntryPoint, mPlabel.GP);

  //
  // Create a Virtual address change notification event. Pass in the callers
  // GoVirtualChildEvent so it's get passed to the event as contex.
  //
  Status = gBS->CreateEvent (
                  EFI_EVENT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
                  EFI_TPL_NOTIFY,
                  EfiRuntimeLibVirtualNotifyEvent,
                  (VOID *) GoVirtualChildEvent,
                  &mEfiVirtualNotifyEvent
                  );
  ASSERT_EFI_ERROR (Status);

  return EFI_SUCCESS;
}

EFI_STATUS
EfiShutdownRuntimeDriverLib (
  VOID
  )
/*++

Routine Description:

  This routine will free some resources which have been allocated in
  EfiInitializeRuntimeDriverLib(). If a runtime driver exits with an error,
  it must call this routine to free the allocated resource before the exiting.

Arguments:

  None

Returns:

  EFI_SUCCESS     - Shotdown the Runtime Driver Lib successfully
  EFI_UNSUPPORTED - Runtime Driver lib was not initialized at all

--*/
{
  EFI_STATUS  Status;

  if (!mRuntimeLibInitialized) {
    //
    // You must call EfiInitializeRuntimeDriverLib() first
    //
    return EFI_UNSUPPORTED;
  }

  mRuntimeLibInitialized = FALSE;

  //
  // Close SetVirtualAddressMap () notify function
  //
  Status = gBS->CloseEvent (mEfiVirtualNotifyEvent);
  ASSERT_EFI_ERROR (Status);

  return EFI_SUCCESS;
}

EFI_STATUS
RegisterEsalFunction (
  IN  UINT64                                    FunctionId,
  IN  EFI_GUID                                  *ClassGuid,
  IN  SAL_INTERNAL_EXTENDED_SAL_PROC            Function,
  IN  VOID                                      *ModuleGlobal
  )
/*++

Routine Description:

  Register ESAL Class Function and it's asociated global.
  This function is boot service only!

Arguments:
  FunctionId    - ID of function to register
  ClassGuid     - GUID of function class
  Function      - Function to register under ClassGuid/FunctionId pair
  ModuleGlobal  - Module global for Function.

Returns:
  EFI_SUCCESS - If ClassGuid/FunctionId Function was registered.

--*/
{
  return mEsalBootService->AddExtendedSalProc (
                            mEsalBootService,
                            ClassGuid,
                            FunctionId,
                            Function,
                            ModuleGlobal
                            );
}

EFI_STATUS
RegisterEsalClass (
  IN  EFI_GUID                                  *ClassGuid,
  IN  VOID                                      *ModuleGlobal,
  ...
  )
/*++

Routine Description:

  Register ESAL Class and it's asociated global.
  This function is boot service only!

Arguments:
  ClassGuid     - GUID of function class
  ModuleGlobal  - Module global for Function.
  ...           - SAL_INTERNAL_EXTENDED_SAL_PROC and FunctionId pairs. NULL
                  indicates the end of the list.

Returns:
  EFI_SUCCESS - All members of ClassGuid registered

--*/
{
  VA_LIST                         Args;
  EFI_STATUS                      Status;
  SAL_INTERNAL_EXTENDED_SAL_PROC  Function;
  UINT64                          FunctionId;
  EFI_HANDLE                      NewHandle;

  VA_START (Args, ModuleGlobal);

  Status = EFI_SUCCESS;
  while (!EFI_ERROR (Status)) {
    Function = (SAL_INTERNAL_EXTENDED_SAL_PROC) VA_ARG (Args, SAL_INTERNAL_EXTENDED_SAL_PROC);
    if (Function == NULL) {
      break;
    }

    FunctionId  = VA_ARG (Args, UINT64);

    Status      = RegisterEsalFunction (FunctionId, ClassGuid, Function, ModuleGlobal);
  }

  VA_END (Args);

  if (EFI_ERROR (Status)) {
    return Status;
  }

  NewHandle = NULL;
  return gBS->InstallProtocolInterface (
                &NewHandle,
                ClassGuid,
                EFI_NATIVE_INTERFACE,
                NULL
                );
}

SAL_RETURN_REGS
EfiCallEsalService (
  IN  EFI_GUID                                      *ClassGuid,
  IN  UINT64                                        FunctionId,
  IN  UINT64                                        Arg2,
  IN  UINT64                                        Arg3,
  IN  UINT64                                        Arg4,
  IN  UINT64                                        Arg5,
  IN  UINT64                                        Arg6,
  IN  UINT64                                        Arg7,
  IN  UINT64                                        Arg8
  )
/*++

Routine Description:

  Call module that is not linked direclty to this module. This code is IP
  relative and hides the binding issues of virtual or physical calling. The
  function that gets dispatched has extra arguments that include the registered
  module global and a boolean flag to indicate if the system is in virutal mode.

Arguments:
  ClassGuid   - GUID of function
  FunctionId  - Function in ClassGuid to call
  Arg2        - Argument 2 ClassGuid/FunctionId defined
  Arg3        - Argument 3 ClassGuid/FunctionId defined
  Arg4        - Argument 4 ClassGuid/FunctionId defined
  Arg5        - Argument 5 ClassGuid/FunctionId defined
  Arg6        - Argument 6 ClassGuid/FunctionId defined
  Arg7        - Argument 7 ClassGuid/FunctionId defined
  Arg8        - Argument 8 ClassGuid/FunctionId defined

Returns:
  Status of ClassGuid/FuncitonId

--*/
{
  SAL_RETURN_REGS       ReturnReg;
  SAL_EXTENDED_SAL_PROC EsalProc;

  ReturnReg = GetEsalEntryPoint ();
  if (ReturnReg.Status != EFI_SAL_SUCCESS) {
    return ReturnReg;
  }

  if (ReturnReg.r11 & PSR_IT_MASK) {
    //
    // Virtual mode plabel to entry point
    //
    EsalProc = (SAL_EXTENDED_SAL_PROC) ReturnReg.r10;
  } else {
    //
    // Physical mode plabel to entry point
    //
    EsalProc = (SAL_EXTENDED_SAL_PROC) ReturnReg.r9;
  }

  return EsalProc (
          ClassGuid,
          FunctionId,
          Arg2,
          Arg3,
          Arg4,
          Arg5,
          Arg6,
          Arg7,
          Arg8
          );
}

EFI_STATUS
EfiConvertPointer (
  IN UINTN                     DebugDisposition,
  IN OUT VOID                  *Address
  )
/*++

Routine Description:

  Determines the new virtual address that is to be used on subsequent memory accesses.

Arguments:

  DebugDisposition  - Supplies type information for the pointer being converted.
  Address           - A pointer to a pointer that is to be fixed to be the value needed
                      for the new virtual address mappings being applied.

Returns:

  Status code

--*/
{
  return mRT->ConvertPointer (DebugDisposition, Address);
}

BOOLEAN
EfiGoneVirtual (
  VOID
  )
/*++

Routine Description:
  Return TRUE if SetVirtualAddressMap () has been called

Arguments:
  NONE

Returns:
  TRUE - If SetVirtualAddressMap () has been called

--*/
{
  EFI_GUID Guid = EFI_EXTENDED_SAL_VIRTUAL_SERVICES_PROTOCOL_GUID;
  SAL_RETURN_REGS ReturnReg;

  ReturnReg = EfiCallEsalService (&Guid, IsVirtual, 0, 0, 0, 0, 0, 0, 0);

  return (BOOLEAN) (ReturnReg.r9 == 1);
}

BOOLEAN
EfiAtRuntime (
  VOID
  )
/*++

Routine Description:
  Return TRUE if ExitBootService () has been called

Arguments:
  NONE

Returns:
  TRUE - If ExitBootService () has been called

--*/
{
  EFI_GUID Guid = EFI_EXTENDED_SAL_VIRTUAL_SERVICES_PROTOCOL_GUID;
  SAL_RETURN_REGS ReturnReg;

  ReturnReg = EfiCallEsalService (&Guid, IsEfiRuntime, 0, 0, 0, 0, 0, 0, 0);

  return (BOOLEAN) (ReturnReg.r9 == 1);
}

EFI_STATUS
EfiReportStatusCode (
  IN EFI_STATUS_CODE_TYPE     CodeType,
  IN EFI_STATUS_CODE_VALUE    Value,
  IN UINT32                   Instance,
  IN EFI_GUID                 * CallerId,
  IN EFI_STATUS_CODE_DATA     * Data OPTIONAL
  )
/*++

Routine Description:

  Status Code reporter

Arguments:

  CodeType    - Type of Status Code.

  Value       - Value to output for Status Code.

  Instance    - Instance Number of this status code.

  CallerId    - ID of the caller of this status code.

  Data        - Optional data associated with this status code.

Returns:

  Status code

--*/
{
  EFI_GUID Guid = EFI_EXTENDED_SAL_STATUS_CODE_SERVICES_PROTOCOL_GUID;
  SAL_RETURN_REGS ReturnReg;


  ReturnReg = EfiCallEsalService (
                &Guid,
                StatusCode,
                (UINT64) CodeType,
                (UINT64) Value,
                (UINT64) Instance,
                (UINT64) CallerId,
                (UINT64) Data,
                0,
                0
                );

  return (EFI_STATUS) ReturnReg.Status;
}
//
//  Sal Reset Driver Class
//
VOID
EfiResetSystem (
  IN EFI_RESET_TYPE     ResetType,
  IN EFI_STATUS         ResetStatus,
  IN UINTN              DataSize,
  IN CHAR16             *ResetData
  )
/*++

Routine Description:

  Resets the entire platform.

Arguments:

  ResetType   - The type of reset to perform.
  ResetStatus - The status code for the reset.
  DataSize    - The size, in bytes, of ResetData.
  ResetData   - A data buffer that includes a Null-terminated Unicode string, optionally
                followed by additional binary data.

Returns:

  None

--*/
{
  EFI_GUID Guid = EFI_EXTENDED_SAL_RESET_SERVICES_PROTOCOL_GUID;

  EfiCallEsalService (
    &Guid,
    ResetSystem,
    (UINT64) ResetType,
    (UINT64) ResetStatus,
    (UINT64) DataSize,
    (UINT64) ResetData,
    0,
    0,
    0
    );
}
//
//  Sal MTC Driver Class
//
EFI_STATUS
EfiGetNextHighMonotonicCount (
  OUT UINT32      *HighCount
  )
/*++

Routine Description:

  Returns the next high 32 bits of the platform's monotonic counter.

Arguments:

  HighCount - Pointer to returned value.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_MTC_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, GetNextHighMonotonicCount, (UINT64) HighCount, 0, 0, 0, 0, 0, 0);
  return (EFI_STATUS) ReturnReg.Status;
}
//
// Sal Variable Driver Class
//
EFI_STATUS
EfiGetVariable (
  IN CHAR16                       *VariableName,
  IN EFI_GUID                     * VendorGuid,
  OUT UINT32                      *Attributes OPTIONAL,
  IN OUT UINTN                    *DataSize,
  OUT VOID                        *Data
  )
/*++

Routine Description:

  Returns the value of a variable.

Arguments:

  VariableName  - A Null-terminated Unicode string that is the name of the
                  vendor's variable.
  VendorGuid    - A unique identifier for the vendor.
  Attributes    - If not NULL, a pointer to the memory location to return the
                  attributes bitmask for the variable.
  DataSize      - On input, the size in bytes of the return Data buffer.
                  On output the size of data returned in Data.
  Data          - The buffer to return the contents of the variable.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;
  EFI_GUID Guid = EFI_EXTENDED_SAL_VARIABLE_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (
                &Guid,
                EsalGetVariable,
                (UINT64) VariableName,
                (UINT64) VendorGuid,
                (UINT64) Attributes,
                (UINT64) DataSize,
                (UINT64) Data,
                0,
                0
                );
  return (EFI_STATUS) ReturnReg.Status;
}

EFI_STATUS
EfiGetNextVariableName (
  IN OUT UINTN                    *VariableNameSize,
  IN OUT CHAR16                   *VariableName,
  IN OUT EFI_GUID                 *VendorGuid
  )
/*++

Routine Description:

  Enumerates the current variable names.

Arguments:

  VariableNameSize  - The size of the VariableName buffer.
  VariableName      - On input, supplies the last VariableName that was returned
                      by GetNextVariableName().
                      On output, returns the Nullterminated Unicode string of the
                      current variable.
  VendorGuid        - On input, supplies the last VendorGuid that was returned by
                      GetNextVariableName().
                      On output, returns the VendorGuid of the current variable.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;
  EFI_GUID Guid = EFI_EXTENDED_SAL_VARIABLE_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (
                &Guid,
                EsalGetNextVariableName,
                (UINT64) VariableNameSize,
                (UINT64) VariableName,
                (UINT64) VendorGuid,
                0,
                0,
                0,
                0
                );
  return (EFI_STATUS) ReturnReg.Status;
}

EFI_STATUS
EfiSetVariable (
  IN CHAR16                       *VariableName,
  IN EFI_GUID                     *VendorGuid,
  IN UINT32                       Attributes,
  IN UINTN                        DataSize,
  IN VOID                         *Data
  )
/*++

Routine Description:

  Sets the value of a variable.

Arguments:

  VariableName  - A Null-terminated Unicode string that is the name of the
                  vendor's variable.
  VendorGuid    - A unique identifier for the vendor.
  Attributes    - Attributes bitmask to set for the variable.
  DataSize      - The size in bytes of the Data buffer.
  Data          - The contents for the variable.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;
  EFI_GUID Guid = EFI_EXTENDED_SAL_VARIABLE_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (
                &Guid,
                EsalSetVariable,
                (UINT64) VariableName,
                (UINT64) VendorGuid,
                (UINT64) Attributes,
                (UINT64) DataSize,
                (UINT64) Data,
                0,
                0
                );
  return (EFI_STATUS) ReturnReg.Status;
}

#if (EFI_SPECIFICATION_VERSION >= 0x00020000)

EFI_STATUS
EfiQueryVariableInfo (
  IN UINT32           Attributes,
  OUT UINT64          *MaximumVariableStorageSize,
  OUT UINT64          *RemainingVariableStorageSize,
  OUT UINT64          *MaximumVariableSize
  )
/*++

Routine Description:

  This code returns information about the EFI variables.

Arguments:

  Attributes                      Attributes bitmask to specify the type of variables
                                  on which to return information.
  MaximumVariableStorageSize      Pointer to the maximum size of the storage space available
                                  for the EFI variables associated with the attributes specified.
  RemainingVariableStorageSize    Pointer to the remaining size of the storage space available
                                  for the EFI variables associated with the attributes specified.
  MaximumVariableSize             Pointer to the maximum size of the individual EFI variables
                                  associated with the attributes specified.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;
  EFI_GUID Guid = EFI_EXTENDED_SAL_VARIABLE_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (
                &Guid,
                EsalQueryVariableInfo,
                (UINT64) Attributes,
                (UINT64) MaximumVariableStorageSize,
                (UINT64) RemainingVariableStorageSize,
                (UINT64) MaximumVariableSize,
                0,
                0,
                0
                );
  return (EFI_STATUS) ReturnReg.Status;
}

#endif

//
//  Sal RTC Driver Class.
//
EFI_STATUS
EfiGetTime (
  OUT EFI_TIME              *Time,
  OUT EFI_TIME_CAPABILITIES *Capabilities
  )
/*++

Routine Description:

  Returns the current time and date information, and the time-keeping
  capabilities of the hardware platform.

Arguments:

  Time          - A pointer to storage to receive a snapshot of the current time.
  Capabilities  - An optional pointer to a buffer to receive the real time clock device's
                  capabilities.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;
  EFI_GUID Guid = EFI_EXTENDED_SAL_RTC_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, GetTime, (UINT64) Time, (UINT64) Capabilities, 0, 0, 0, 0, 0);
  return ReturnReg.Status;
}

EFI_STATUS
EfiSetTime (
  OUT EFI_TIME              *Time
  )
/*++

Routine Description:

  Sets the current local time and date information.

Arguments:

  Time  - A pointer to the current time.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_RTC_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, SetTime, (UINT64) Time, 0, 0, 0, 0, 0, 0);
  return ReturnReg.Status;
}

EFI_STATUS
EfiGetWakeupTime (
  OUT BOOLEAN       *Enabled,
  OUT BOOLEAN       *Pending,
  OUT EFI_TIME      *Time
  )
/*++

Routine Description:

  Returns the current wakeup alarm clock setting.

Arguments:

  Enabled - Indicates if the alarm is currently enabled or disabled.
  Pending - Indicates if the alarm signal is pending and requires acknowledgement.
  Time    - The current alarm setting.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_RTC_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, GetWakeupTime, (UINT64) Enabled, (UINT64) Pending, (UINT64) Time, 0, 0, 0, 0);
  return ReturnReg.Status;
}

EFI_STATUS
EfiSetWakeupTime (
  IN BOOLEAN        Enable,
  IN EFI_TIME       *Time
  )
/*++

Routine Description:

  Sets the system wakeup alarm clock time.

Arguments:

  Enable  - Enable or disable the wakeup alarm.
  Time    - If Enable is TRUE, the time to set the wakeup alarm for.
            If Enable is FALSE, then this parameter is optional, and may be NULL.

Returns:

  Status code

--*/
{
  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_RTC_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, SetWakeupTime, (UINT64) Enable, (UINT64) Time, 0, 0, 0, 0, 0);
  return ReturnReg.Status;
}


//
//  Base IO Services
//
EFI_STATUS
EfiIoRead (
  IN     EFI_CPU_IO_PROTOCOL_WIDTH  Width,
  IN     UINT64                     Address,
  IN     UINTN                      Count,
  IN OUT VOID                       *Buffer
  )
/*++

Routine Description:
  Perform an IO read into Buffer.

Arguments:
  Width   - Width of read transaction, and repeat operation to use
  Address - IO address to read
  Count   - Number of times to read the IO address.
  Buffer  - Buffer to read data into. size is Width * Count

Returns:
  Status code

--*/
{

  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_BASE_IO_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, IoRead, (UINT64) Width, Address, Count, (UINT64) Buffer, 0, 0, 0);
  ASSERT (ReturnReg.Status == EFI_SAL_SUCCESS);

  return ReturnReg.Status;

}

EFI_STATUS
EfiIoWrite (
  IN     EFI_CPU_IO_PROTOCOL_WIDTH  Width,
  IN     UINT64                     Address,
  IN     UINTN                      Count,
  IN OUT VOID                       *Buffer
  )
/*++

Routine Description:
  Perform an IO write into Buffer.

Arguments:
  Width   - Width of write transaction, and repeat operation to use
  Address - IO address to write
  Count   - Number of times to write the IO address.
  Buffer  - Buffer to write data from. size is Width * Count

Returns:
  Status code

--*/
{

  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_BASE_IO_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, IoWrite, (UINT64) Width, Address, Count, (UINT64) Buffer, 0, 0, 0);

  return ReturnReg.Status;

}

EFI_STATUS
EfiMemRead (
  IN     EFI_CPU_IO_PROTOCOL_WIDTH  Width,
  IN     UINT64                     Address,
  IN     UINTN                      Count,
  IN  OUT VOID                      *Buffer
  )
/*++

Routine Description:
  Perform a Memory mapped IO read into Buffer.

Arguments:
  Width   - Width of each read transaction.
  Address - Memory mapped IO address to read
  Count   - Number of Width quanta to read
  Buffer  - Buffer to read data into. size is Width * Count

Returns:
  Status code

--*/
{

  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_BASE_IO_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, MemRead, (UINT64) Width, Address, Count, (UINT64) Buffer, 0, 0, 0);
  ASSERT (ReturnReg.Status == EFI_SAL_SUCCESS);

  return ReturnReg.Status;

}

EFI_STATUS
EfiMemWrite (
  IN     EFI_CPU_IO_PROTOCOL_WIDTH  Width,
  IN     UINT64                     Address,
  IN     UINTN                      Count,
  IN OUT VOID                       *Buffer
  )
/*++

Routine Description:
  Perform a memory mapped IO write into Buffer.

Arguments:
  Width   - Width of write transaction, and repeat operation to use
  Address - IO address to write
  Count   - Number of times to write the IO address.
  Buffer  - Buffer to write data from. size is Width * Count

Returns:
  Status code

--*/
{

  SAL_RETURN_REGS ReturnReg;

  EFI_GUID Guid = EFI_EXTENDED_SAL_BASE_IO_SERVICES_PROTOCOL_GUID;

  ReturnReg = EfiCallEsalService (&Guid, MemWrite, (UINT64) Width, Address, Count, (UINT64) Buffer, 0, 0, 0);

  return ReturnReg.Status;

}


#define EFI_PCI_ADDRESS_IPF(_seg, _bus, _devfunc, _reg) \
    (((_seg) << 24) | ((_bus) << 16) | ((_devfunc) << 8) | (_reg)) & 0xFFFFFFFF

//
//  PCI Class Functions
//
UINT8
PciRead8 (
  UINT8   Segment,
  UINT8   Bus,
  UINT8   DevFunc,
  UINT8   Register
  )
/*++

Routine Description:
  Perform an one byte PCI config cycle read

Arguments:
  Segment   - PCI Segment ACPI _SEG
  Bus       - PCI Bus
  DevFunc   - PCI Device(7:3) and Func(2:0)
  Register  - PCI config space register

Returns:
  Data read from PCI config space

--*/
{
  EFI_GUID        Guid = EFI_EXTENDED_SAL_PCI_SERVICES_PROTOCOL_GUID;
  UINT64          Address;
  SAL_RETURN_REGS Return;

  Address = EFI_PCI_ADDRESS_IPF (Segment, Bus, DevFunc, Register);
  Return  = EfiCallEsalService (&Guid, SalPciConfigRead, Address, 1, 0, 0, 0, 0, 0);

  return (UINT8) Return.r9;
}


UINT16
PciRead16 (
  UINT8   Segment,
  UINT8   Bus,
  UINT8   DevFunc,
  UINT8   Register
  )
/*++

Routine Description:
  Perform an two byte PCI config cycle read

Arguments:
  Segment   - PCI Segment ACPI _SEG
  Bus       - PCI Bus
  DevFunc   - PCI Device(7:3) and Func(2:0)
  Register  - PCI config space register

Returns:
  Data read from PCI config space

--*/
{
  EFI_GUID        Guid = EFI_EXTENDED_SAL_PCI_SERVICES_PROTOCOL_GUID;
  UINT64          Address;
  SAL_RETURN_REGS Return;

  Address = EFI_PCI_ADDRESS_IPF (Segment, Bus, DevFunc, Register);
  Return  = EfiCallEsalService (&Guid, SalPciConfigRead, Address, 2, 0, 0, 0, 0, 0);

  return (UINT16) Return.r9;
}

UINT32
PciRead32 (
  UINT8   Segment,
  UINT8   Bus,
  UINT8   DevFunc,
  UINT8   Register
  )
/*++

Routine Description:
  Perform an four byte PCI config cycle read

Arguments:
  Segment   - PCI Segment ACPI _SEG
  Bus       - PCI Bus
  DevFunc   - PCI Device(7:3) and Func(2:0)
  Register  - PCI config space register

Returns:
  Data read from PCI config space

--*/
{
  EFI_GUID        Guid = EFI_EXTENDED_SAL_PCI_SERVICES_PROTOCOL_GUID;
  UINT64          Address;
  SAL_RETURN_REGS Return;

  Address = EFI_PCI_ADDRESS_IPF (Segment, Bus, DevFunc, Register);
  Return  = EfiCallEsalService (&Guid, SalPciConfigRead, Address, 4, 0, 0, 0, 0, 0);

  return (UINT32) Return.r9;
}

VOID
PciWrite8 (
  UINT8   Segment,
  UINT8   Bus,
  UINT8   DevFunc,
  UINT8   Register,
  UINT8   Data
  )
/*++

Routine Description:
  Perform an one byte PCI config cycle write

Arguments:
  Segment   - PCI Segment ACPI _SEG
  Bus       - PCI Bus
  DevFunc   - PCI Device(7:3) and Func(2:0)
  Register  - PCI config space register
  Data      - Data to write

Returns:
  NONE

--*/
{
  EFI_GUID        Guid = EFI_EXTENDED_SAL_PCI_SERVICES_PROTOCOL_GUID;
  UINT64    Address;

  Address = EFI_PCI_ADDRESS_IPF (Segment, Bus, DevFunc, Register);
  EfiCallEsalService (&Guid, SalPciConfigWrite, Address, 1, Data, 0, 0, 0, 0);
}

VOID
PciWrite16 (
  UINT8   Segment,
  UINT8   Bus,
  UINT8   DevFunc,
  UINT8   Register,
  UINT16  Data
  )
/*++

Routine Description:
  Perform an two byte PCI config cycle write

Arguments:
  Segment   - PCI Segment ACPI _SEG
  Bus       - PCI Bus
  DevFunc   - PCI Device(7:3) and Func(2:0)
  Register  - PCI config space register
  Data      - Data to write

Returns:
  None.

--*/
{
  EFI_GUID        Guid = EFI_EXTENDED_SAL_PCI_SERVICES_PROTOCOL_GUID;
  UINT64    Address;

  Address = EFI_PCI_ADDRESS_IPF (Segment, Bus, DevFunc, Register);
  EfiCallEsalService (&Guid, SalPciConfigWrite, Address, 2, Data, 0, 0, 0, 0);
}

VOID
PciWrite32 (
  UINT8   Segment,
  UINT8   Bus,
  UINT8   DevFunc,
  UINT8   Register,
  UINT32  Data
  )
/*++

Routine Description:
  Perform an four byte PCI config cycle write

Arguments:
  Segment   - PCI Segment ACPI _SEG
  Bus       - PCI Bus
  DevFunc   - PCI Device(7:3) and Func(2:0)
  Register  - PCI config space register
  Data      - Data to write

Returns:
  NONE

--*/
{
  EFI_GUID  Guid = EFI_EXTENDED_SAL_PCI_SERVICES_PROTOCOL_GUID;
  UINT64    Address;

  Address = EFI_PCI_ADDRESS_IPF (Segment, Bus, DevFunc, Register);
  EfiCallEsalService (&Guid, SalPciConfigWrite, Address, 4, Data, 0, 0, 0, 0);
}

//
// Stall class functions
//
VOID
EfiStall (
  IN  UINTN   Microseconds
  )
/*++

Routine Description:
 Delay for at least the request number of microseconds

Arguments:
  Microseconds - Number of microseconds to delay.

Returns:
  NONE

--*/
{
  EFI_GUID        Guid = EFI_EXTENDED_SAL_STALL_SERVICES_PROTOCOL_GUID;

  if (EfiAtRuntime ()) {
    EfiCallEsalService (&Guid, Stall, Microseconds, 4, 0, 0, 0, 0, 0);
  } else {
    gBS->Stall (Microseconds);
  }
}
//
// Cache Flush Routine.
//
EFI_STATUS
EfiCpuFlushCache (
  IN EFI_PHYSICAL_ADDRESS          Start,
  IN UINT64                        Length
  )
/*++

Routine Description:

  Flush cache with specified range.

Arguments:

  Start   - Start address
  Length  - Length in bytes

Returns:

  Status code

  EFI_SUCCESS - success

--*/
{
  SalFlushCache (Start, Length);
  return EFI_SUCCESS;
}