This protocol is produced by every driver that follows the UEFI Driver Model, \r
and it is the central component that allows drivers and controllers to be managed.\r
\r
- Copyright (c) 2006 - 2009, Intel Corporation \r
- All rights reserved. This program and the accompanying materials \r
- are licensed and made available under the terms and conditions of the BSD License \r
- which accompanies this distribution. The full text of the license may be found at \r
- http://opensource.org/licenses/bsd-license.php \r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved<BR>\r
+This program and the accompanying materials are licensed and made available under \r
+the terms and conditions of the BSD License that accompanies this distribution. \r
+The full text of the license may be found at\r
+http://opensource.org/licenses/bsd-license.php. \r
+ \r
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
\r
**/\r
\r
#define __EFI_DRIVER_BINDING_H__\r
\r
///\r
-/// Global ID for the ControllerHandle Driver Protocol\r
+/// The global ID for the ControllerHandle Driver Protocol.\r
///\r
#define EFI_DRIVER_BINDING_PROTOCOL_GUID \\r
{ \\r
Tests to see if this driver supports a given controller. If a child device is provided, \r
it further tests to see if this driver supports creating a handle for the specified child device.\r
\r
+ This function checks to see if the driver specified by This supports the device specified by \r
+ ControllerHandle. Drivers will typically use the device path attached to \r
+ ControllerHandle and/or the services from the bus I/O abstraction attached to \r
+ ControllerHandle to determine if the driver supports ControllerHandle. This function \r
+ may be called many times during platform initialization. In order to reduce boot times, the tests \r
+ performed by this function must be very small, and take as little time as possible to execute. This \r
+ function must not change the state of any hardware devices, and this function must be aware that the \r
+ device specified by ControllerHandle may already be managed by the same driver or a \r
+ different driver. This function must match its calls to AllocatePages() with FreePages(), \r
+ AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol(). \r
+ Because ControllerHandle may have been previously started by the same driver, if a protocol is \r
+ already in the opened state, then it must not be closed with CloseProtocol(). This is required \r
+ to guarantee the state of ControllerHandle is not modified by this function.\r
+\r
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.\r
@param[in] ControllerHandle The handle of the controller to test. This handle \r
must support a protocol interface that supplies \r
an I/O abstraction to the driver.\r
- @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. \r
- This parameter is ignored by device drivers, and is optional for bus drivers.\r
-\r
+ @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This \r
+ parameter is ignored by device drivers, and is optional for bus \r
+ drivers. For bus drivers, if this parameter is not NULL, then \r
+ the bus driver must determine if the bus controller specified \r
+ by ControllerHandle and the child controller specified \r
+ by RemainingDevicePath are both supported by this \r
+ bus driver.\r
\r
@retval EFI_SUCCESS The device specified by ControllerHandle and\r
RemainingDevicePath is supported by the driver specified by This.\r
specified by This.\r
@retval EFI_ACCESS_DENIED The device specified by ControllerHandle and\r
RemainingDevicePath is already being managed by a different\r
- driver or an application that requires exclusive acces.\r
+ driver or an application that requires exclusive access.\r
Currently not implemented.\r
@retval EFI_UNSUPPORTED The device specified by ControllerHandle and\r
RemainingDevicePath is not supported by the driver specified by This.\r
);\r
\r
/**\r
- Start this driver on ControllerHandle. The Start() function is designed to be \r
- invoked from the EFI boot service ConnectController(). As a result, much of \r
- the error checking on the parameters to Start() has been moved into this \r
+ Starts a device controller or a bus controller.\r
+\r
+ The Start() function is designed to be invoked from the EFI boot service ConnectController().\r
+ As a result, much of the error checking on the parameters to Start() has been moved into this \r
common boot service. It is legal to call Start() from other locations, \r
- but the following calling restrictions must be followed or the system behavior will not be deterministic.\r
+ but the following calling restrictions must be followed, or the system behavior will not be deterministic.\r
1. ControllerHandle must be a valid EFI_HANDLE.\r
2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned\r
EFI_DEVICE_PATH_PROTOCOL.\r
@param[in] ControllerHandle The handle of the controller to start. This handle \r
must support a protocol interface that supplies \r
an I/O abstraction to the driver.\r
- @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. \r
- This parameter is ignored by device drivers, and is optional for bus drivers.\r
+ @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This \r
+ parameter is ignored by device drivers, and is optional for bus \r
+ drivers. For a bus driver, if this parameter is NULL, then handles \r
+ for all the children of Controller are created by this driver. \r
+ If this parameter is not NULL and the first Device Path Node is \r
+ not the End of Device Path Node, then only the handle for the \r
+ child device specified by the first Device Path Node of \r
+ RemainingDevicePath is created by this driver.\r
+ If the first Device Path Node of RemainingDevicePath is \r
+ the End of Device Path Node, no child handle is created by this\r
+ driver.\r
\r
@retval EFI_SUCCESS The device was started.\r
@retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.\r
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.\r
@retval Others The driver failded to start the device.\r
+\r
**/\r
typedef\r
EFI_STATUS\r
);\r
\r
/**\r
- Stop this driver on ControllerHandle. \r
+ Stops a device controller or a bus controller.\r
\r
- Release the control of this controller and remove the IScsi functions. The Stop()\r
- function is designed to be invoked from the EFI boot service DisconnectController(). \r
+ The Stop() function is designed to be invoked from the EFI boot service DisconnectController(). \r
As a result, much of the error checking on the parameters to Stop() has been moved \r
into this common boot service. It is legal to call Stop() from other locations, \r
- but the following calling restrictions must be followed or the system behavior will not be deterministic.\r
+ but the following calling restrictions must be followed, or the system behavior will not be deterministic.\r
1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this\r
same driver's Start() function.\r
2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid\r
@param[in] ControllerHandle A handle to the device being stopped. The handle must \r
support a bus specific I/O protocol for the driver \r
to use to stop the device.\r
- @param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.Not used.\r
+ @param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.\r
@param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL \r
if NumberOfChildren is 0.\r
\r
@retval EFI_SUCCESS The device was stopped.\r
@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.\r
+\r
**/\r
typedef\r
EFI_STATUS\r
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