efidriverlib.h

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/*++

Copyright (c) 2004 - 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.             

Module Name:

  EfiDriverLib.h

Abstract:

  Light weight lib to support EFI drivers.

--*/

#ifndef _EFI_DRIVER_LIB_H_
#define _EFI_DRIVER_LIB_H_

#include "EfiStatusCode.h"
#include "EfiCommonLib.h"
#include "EfiPerf.h"
#include "LinkedList.h"
#include "GetImage.h"
#include "EfiImageFormat.h"

#include EFI_GUID_DEFINITION (DxeServices)
#include EFI_GUID_DEFINITION (EventGroup)
#include EFI_GUID_DEFINITION (EventLegacyBios)
#include EFI_GUID_DEFINITION (FrameworkDevicePath)
#include EFI_PROTOCOL_DEFINITION (FirmwareVolume)
#include EFI_PROTOCOL_DEFINITION (DataHub)
#include EFI_PROTOCOL_DEFINITION (DriverBinding)
#include EFI_PROTOCOL_DEFINITION (ComponentName)
#include EFI_PROTOCOL_DEFINITION (DriverConfiguration)
#include EFI_PROTOCOL_DEFINITION (DriverDiagnostics)

#include EFI_PROTOCOL_DEFINITION (DebugMask)

typedef struct {
  CHAR8   *Language;
  CHAR16  *UnicodeString;
} EFI_UNICODE_STRING_TABLE;

//
// Macros for EFI Driver Library Functions that are really EFI Boot Services
//
#define EfiCopyMem(_Destination, _Source, _Length)  gBS->CopyMem ((_Destination), (_Source), (_Length))
#define EfiSetMem(_Destination, _Length, _Value)    gBS->SetMem ((_Destination), (_Length), (_Value))
#define EfiZeroMem(_Destination, _Length)           gBS->SetMem ((_Destination), (_Length), 0)

//
// Driver Lib Globals.
//
extern EFI_BOOT_SERVICES        *gBS;
extern EFI_DXE_SERVICES         *gDS;
extern EFI_RUNTIME_SERVICES     *gRT;
extern EFI_SYSTEM_TABLE         *gST;
extern UINTN                    gErrorLevel;
extern EFI_GUID                 gEfiCallerIdGuid;
extern EFI_DEBUG_MASK_PROTOCOL  *gDebugMaskInterface;

EFI_STATUS
EfiInitializeDriverLib (
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
/*++

Routine Description:

  Intialize 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.


Returns: 

  EFI_STATUS always returns EFI_SUCCESS

--*/
;

EFI_STATUS
DxeInitializeDriverLib (
  IN EFI_HANDLE           ImageHandle,
  IN EFI_SYSTEM_TABLE     *SystemTable
  )
/*++

Routine Description:

  Intialize 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.

Returns: 

  EFI_STATUS always returns EFI_SUCCESS

--*/
;

EFI_STATUS
EfiLibInstallDriverBinding (
  IN EFI_HANDLE                   ImageHandle,
  IN EFI_SYSTEM_TABLE             *SystemTable,
  IN EFI_DRIVER_BINDING_PROTOCOL  *DriverBinding,
  IN EFI_HANDLE                   DriverBindingHandle
  )
/*++

Routine Description:

  Intialize a driver by installing the Driver Binding Protocol onto the 
  driver's DriverBindingHandle.  This is typically the same as the driver's
  ImageHandle, but it can be different if the driver produces multiple
  DriverBinding Protocols.  This function also initializes the EFI Driver
  Library that initializes the global variables gST, gBS, gRT.

Arguments:

  ImageHandle         - The image handle of the driver

  SystemTable         - The EFI System Table that was passed to the driver's entry point

  DriverBinding       - A Driver Binding Protocol instance that this driver is producing

  DriverBindingHandle - The handle that DriverBinding is to be installe onto.  If this
                        parameter is NULL, then a new handle is created.

Returns: 

  EFI_SUCCESS is DriverBinding is installed onto DriverBindingHandle

  Otherwise, then return status from gBS->InstallProtocolInterface()

--*/
;

EFI_STATUS
EfiLibInstallAllDriverProtocols (
  IN EFI_HANDLE                         ImageHandle,
  IN EFI_SYSTEM_TABLE                   *SystemTable,
  IN EFI_DRIVER_BINDING_PROTOCOL        *DriverBinding,
  IN EFI_HANDLE                         DriverBindingHandle,
  IN EFI_COMPONENT_NAME_PROTOCOL        *ComponentName,
  IN EFI_DRIVER_CONFIGURATION_PROTOCOL  *DriverConfiguration,
  IN EFI_DRIVER_DIAGNOSTICS_PROTOCOL    *DriverDiagnostics
  )
/*++

Routine Description:

  Intialize a driver by installing the Driver Binding Protocol onto the 
  driver's DriverBindingHandle.  This is typically the same as the driver's
  ImageHandle, but it can be different if the driver produces multiple
  DriverBinding Protocols.  This function also initializes the EFI Driver
  Library that initializes the global variables gST, gBS, gRT.

Arguments:

  ImageHandle         - The image handle of the driver

  SystemTable         - The EFI System Table that was passed to the driver's entry point

  DriverBinding       - A Driver Binding Protocol instance that this driver is producing

  DriverBindingHandle - The handle that DriverBinding is to be installe onto.  If this
                        parameter is NULL, then a new handle is created.

  ComponentName       - A Component Name Protocol instance that this driver is producing

  DriverConfiguration - A Driver Configuration Protocol instance that this driver is producing
  
  DriverDiagnostics   - A Driver Diagnostics Protocol instance that this driver is producing

Returns: 

  EFI_SUCCESS if all the protocols were installed onto DriverBindingHandle

  Otherwise, then return status from gBS->InstallProtocolInterface()

--*/
;

EFI_STATUS
EfiLibGetSystemConfigurationTable (
  IN EFI_GUID *TableGuid,
  IN OUT VOID **Table
  )
/*++

Routine Description:
  
  Return the EFI 1.0 System Tabl entry with TableGuid

Arguments:

  TableGuid - Name of entry to return in the system table
  Table     - Pointer in EFI system table associated with TableGuid

Returns: 

  EFI_SUCCESS - Table returned;
  EFI_NOT_FOUND - TableGuid not in EFI system table

--*/
;

BOOLEAN
EfiLibCompareLanguage (
  CHAR8  *Language1,
  CHAR8  *Language2
  )
/*++

Routine Description:

  Compare two languages to say whether they are identical.

Arguments:

  Language1 - first language
  Language2 - second language

Returns:

  TRUE      - identical
  FALSE     - not identical

--*/
;

//
// DevicePath.c
//
BOOLEAN
EfiIsDevicePathMultiInstance (
  IN EFI_DEVICE_PATH_PROTOCOL  *DevicePath
  )
/*++

Routine Description:
  Return TRUE is this is a multi instance device path.

Arguments:
  DevicePath  - A pointer to a device path data structure.


Returns:
  TRUE - If DevicePath is multi instance. 
  FALSE - If DevicePath is not multi instance.

--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiDevicePathInstance (
  IN OUT EFI_DEVICE_PATH_PROTOCOL   **DevicePath,
  OUT UINTN                         *Size
  )
/*++

Routine Description:
  Function retrieves the next device path instance from a device path data structure.

Arguments:
  DevicePath           - A pointer to a device path data structure.

  Size                 - A pointer to the size of a device path instance in bytes.

Returns:

  This function returns a pointer to the current device path instance.
  In addition, it returns the size in bytes of the current device path instance in Size,
  and a pointer to the next device path instance in DevicePath.
  If there are no more device path instances in DevicePath, then DevicePath will be set to NULL.

--*/
;

UINTN
EfiDevicePathSize (
  IN EFI_DEVICE_PATH_PROTOCOL  *DevPath
  )
/*++

Routine Description:

  Calculate the size of a whole device path.    
    
Arguments:

  DevPath - The pointer to the device path data.
    
Returns:

  Size of device path data structure..

--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiAppendDevicePath (
  IN EFI_DEVICE_PATH_PROTOCOL  *Src1,
  IN EFI_DEVICE_PATH_PROTOCOL  *Src2
  )
/*++

Routine Description:
  Function is used to append a Src1 and Src2 together.

Arguments:
  Src1  - A pointer to a device path data structure.

  Src2  - A pointer to a device path data structure.

Returns:

  A pointer to the new device path is returned.
  NULL is returned if space for the new device path could not be allocated from pool.
  It is up to the caller to free the memory used by Src1 and Src2 if they are no longer needed.

--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiDevicePathFromHandle (
  IN EFI_HANDLE       Handle
  )
/*++

Routine Description:

  Locate device path protocol interface on a device handle.

Arguments:

  Handle  - The device handle

Returns:

  Device path protocol interface located.

--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiDuplicateDevicePath (
  IN EFI_DEVICE_PATH_PROTOCOL  *DevPath
  )
/*++

Routine Description:
  Duplicate a new device path data structure from the old one.

Arguments:
  DevPath  - A pointer to a device path data structure.

Returns:
  A pointer to the new allocated device path data.
  Caller must free the memory used by DevicePath if it is no longer needed.

--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiAppendDevicePathNode (
  IN EFI_DEVICE_PATH_PROTOCOL  *Src1,
  IN EFI_DEVICE_PATH_PROTOCOL  *Src2
  )
/*++

Routine Description:
  Function is used to append a device path node to the end of another device path.

Arguments:
  Src1  - A pointer to a device path data structure.

  Src2 - A pointer to a device path data structure.

Returns:
  This function returns a pointer to the new device path.
  If there is not enough temporary pool memory available to complete this function,
  then NULL is returned.


--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiFileDevicePath (
  IN EFI_HANDLE               Device  OPTIONAL,
  IN CHAR16                   *FileName
  )
/*++

Routine Description:
  Create a device path that appends a MEDIA_DEVICE_PATH with
  FileNameGuid to the device path of DeviceHandle.

Arguments:
  Device   - Optional Device Handle to use as Root of the Device Path

  FileName - FileName

Returns:
  EFI_DEVICE_PATH_PROTOCOL that was allocated from dynamic memory
  or NULL pointer.

--*/
;

EFI_DEVICE_PATH_PROTOCOL        *
EfiAppendDevicePathInstance (
  IN EFI_DEVICE_PATH_PROTOCOL  *Src,
  IN EFI_DEVICE_PATH_PROTOCOL  *Instance
  )
/*++

Routine Description:

  Append a device path instance to another.

Arguments:

  Src       - The device path instance to be appended with.
  Instance  - The device path instance appending the other.

Returns:

  The contaction of these two.

--*/
;

//
// Lock.c
//
typedef struct {
  EFI_TPL Tpl;
  EFI_TPL OwnerTpl;
  UINTN   Lock;
} EFI_LOCK;

VOID
EfiInitializeLock (
  IN OUT EFI_LOCK *Lock,
  IN EFI_TPL      Priority
  )
/*++

Routine Description:

  Initialize a basic mutual exclusion lock.   Each lock
  provides mutual exclusion access at it's task priority
  level.  Since there is no-premption (at any TPL) or
  multiprocessor support, acquiring the lock only consists
  of raising to the locks TPL.

  Note on a check build ASSERT()s are used to ensure proper
  lock usage.
    
Arguments:

  Lock        - The EFI_LOCK structure to initialize

  Priority    - The task priority level of the lock

    
Returns:

  An initialized Efi Lock structure.

--*/
;

//
// Macro to initialize the state of a lock when a lock variable is declared
//
#define EFI_INITIALIZE_LOCK_VARIABLE(Tpl) {Tpl,0,0}

VOID
EfiAcquireLock (
  IN EFI_LOCK *Lock
  )
/*++

Routine Description:

  Raising to the task priority level of the mutual exclusion
  lock, and then acquires ownership of the lock.
    
Arguments:

  Lock - The lock to acquire
    
Returns:

  None

--*/
;

EFI_STATUS
EfiAcquireLockOrFail (
  IN EFI_LOCK  *Lock
  )
/*++

Routine Description:

  Initialize a basic mutual exclusion lock.   Each lock
  provides mutual exclusion access at it's task priority
  level.  Since there is no-premption (at any TPL) or
  multiprocessor support, acquiring the lock only consists
  of raising to the locks TPL.
    
Arguments:

  Lock        - The EFI_LOCK structure to initialize
   
Returns:

  EFI_SUCCESS       - Lock Owned.
  EFI_ACCESS_DENIED - Reentrant Lock Acquisition, Lock not Owned.

--*/
;

VOID
EfiReleaseLock (
  IN EFI_LOCK *Lock
  )
/*++

Routine Description:

    Releases ownership of the mutual exclusion lock, and
    restores the previous task priority level.
    
Arguments:

    Lock - The lock to release
    
Returns:

    None

--*/
;

VOID *
EfiLibAllocatePool (
  IN  UINTN   AllocationSize
  )
/*++

Routine Description:

  Allocate EfiBootServicesData pool of size AllocationSize

Arguments:

  AllocationSize  - Pool size

Returns:

  Pointer to the pool allocated

--*/
;

VOID *
EfiLibAllocateRuntimePool (
  IN  UINTN   AllocationSize
  )
/*++

Routine Description:

  Allocate EfiRuntimeServicesData pool of size AllocationSize