X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=MdeModulePkg%2FUniversal%2FDebugPortDxe%2FDebugPort.c;h=b91003f212ea111f8e9ceac435aabaf670e72abf;hb=49c8b87c66e8034d935ed11673dd8a230e43440a;hp=86e0b851ed745348753673e19b3a04f8852305b6;hpb=19f97f7e860b65f638777845b65b458659c7eb66;p=mirror_edk2.git diff --git a/MdeModulePkg/Universal/DebugPortDxe/DebugPort.c b/MdeModulePkg/Universal/DebugPortDxe/DebugPort.c index 86e0b851ed..b91003f212 100644 --- a/MdeModulePkg/Universal/DebugPortDxe/DebugPort.c +++ b/MdeModulePkg/Universal/DebugPortDxe/DebugPort.c @@ -1,55 +1,48 @@ -/*++ +/** @file + Top level C file for debugport driver. Contains initialization function. + This driver layers on top of SerialIo. + ALL CODE IN THE SERIALIO STACK MUST BE RE-ENTRANT AND CALLABLE FROM + INTERRUPT CONTEXT -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. +Copyright (c) 2006 - 2008, 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 -Module Name: - - DebugPort.c - -Abstract: - - Top level C file for debugport driver. Contains initialization function. - This driver layers on top of SerialIo. - - ALL CODE IN THE SERIALIO STACK MUST BE RE-ENTRANT AND CALLABLE FROM - INTERRUPT CONTEXT. - -Revision History - ---*/ +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 "DebugPort.h" // -// Misc. functions local to this module.. +// Globals // -STATIC -VOID -GetDebugPortVariable ( - DEBUGPORT_DEVICE *DebugPortDevice - ) -/*++ +EFI_DRIVER_BINDING_PROTOCOL gDebugPortDriverBinding = { + DebugPortSupported, + DebugPortStart, + DebugPortStop, + DEBUGPORT_DRIVER_VERSION, + NULL, + NULL +}; + +DEBUGPORT_DEVICE *gDebugPortDevice; -Routine Description: +/** Local worker function to obtain device path information from DebugPort variable. + Records requested settings in DebugPort device structure. -Arguments: - DEBUGPORT_DEVICE *DebugPortDevice, - -Returns: - - Nothing + @param DebugPortDevice Pointer to instance of dubug port device. ---*/ +**/ +VOID +GetDebugPortVariable ( + DEBUGPORT_DEVICE *DebugPortDevice + ) { UINTN DataSize; EFI_DEVICE_PATH_PROTOCOL *DevicePath; @@ -80,7 +73,7 @@ Returns: DebugPortDevice->DebugPortVariable ); DevicePath = (EFI_DEVICE_PATH_PROTOCOL *) DebugPortDevice->DebugPortVariable; - while (!EfiIsDevicePathEnd (DevicePath) && !EfiIsUartDevicePath (DevicePath)) { + while (!EfiIsDevicePathEnd (DevicePath) && !IS_UART_DEVICEPATH (DevicePath)) { DevicePath = EfiNextDevicePathNode (DevicePath); } @@ -115,50 +108,32 @@ Returns: } } + // -// Globals +// implementation code // -EFI_DRIVER_BINDING_PROTOCOL gDebugPortDriverBinding = { - DebugPortSupported, - DebugPortStart, - DebugPortStop, - DEBUGPORT_DRIVER_VERSION, - NULL, - NULL -}; +/** + Debug Port Driver entry pointo. -DEBUGPORT_DEVICE *gDebugPortDevice; + Reads DebugPort variable to determine what device and settings to use as the + debug port. Binds exclusively to SerialIo. Reverts to defaults if no variable + is found. -// -// implementation code -// + @param[in] ImageHandle The firmware allocated handle for the EFI image. + @param[in] SystemTable A pointer to the EFI System Table. + + @retval EFI_SUCCESS The entry point is executed successfully. + @retval EFI_OUT_OF_RESOURCES Fails to allocate memory for device. + @retval other Some error occurs when executing this entry point. +**/ EFI_STATUS EFIAPI InitializeDebugPortDriver ( IN EFI_HANDLE ImageHandle, IN EFI_SYSTEM_TABLE *SystemTable ) -/*++ - -Routine Description: - Driver entry point. Reads DebugPort variable to determine what device and settings - to use as the debug port. Binds exclusively to SerialIo. Reverts to defaults \ - if no variable is found. - - Creates debugport and devicepath protocols on new handle. - -Arguments: - ImageHandle, - SystemTable - -Returns: - - EFI_UNSUPPORTED - EFI_OUT_OF_RESOURCES - ---*/ { EFI_STATUS Status; @@ -200,42 +175,35 @@ Returns: return EFI_SUCCESS; } -// -// DebugPort driver binding member functions... -// -EFI_STATUS -EFIAPI -DebugPortSupported ( - IN EFI_DRIVER_BINDING_PROTOCOL *This, - IN EFI_HANDLE ControllerHandle, - IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath - ) -/*++ -Routine Description: - Checks to see that there's not already a DebugPort interface somewhere. If so, - fail. - +/** + Checks to see if there's not already a DebugPort interface somewhere. + If there's a DEBUGPORT variable, the device path must match exactly. If there's no DEBUGPORT variable, then device path is not checked and does not matter. - Checks to see that there's a serial io interface on the controller handle that can be bound BY_DRIVER | EXCLUSIVE. - If all these tests succeed, then we return EFI_SUCCESS, else, EFI_UNSUPPORTED or other error returned by OpenProtocol. -Arguments: - This - ControllerHandle - RemainingDevicePath - -Returns: - EFI_UNSUPPORTED - EFI_OUT_OF_RESOURCES - EFI_SUCCESS - ---*/ + @param This Protocol instance pointer. + @param ControllerHandle Handle of device to test. + @param RemainingDevicePath Optional parameter use to pick a specific child + device to start. + + @retval EFI_SUCCESS This driver supports this device. + @retval EFI_UNSUPPORTED Debug Port device is not supported. + @retval EFI_OUT_OF_RESOURCES Fails to allocate memory for device. + @retval others Some error occurs. + +**/ +EFI_STATUS +EFIAPI +DebugPortSupported ( + IN EFI_DRIVER_BINDING_PROTOCOL *This, + IN EFI_HANDLE ControllerHandle, + IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath + ) { EFI_STATUS Status; EFI_DEVICE_PATH_PROTOCOL *Dp1; @@ -315,6 +283,20 @@ Returns: return EFI_SUCCESS; } +/** + Binds exclusively to serial io on the controller handle, Produces DebugPort + protocol and DevicePath on new handle. + + @param This Protocol instance pointer. + @param ControllerHandle Handle of device to bind driver to. + @param RemainingDevicePath Optional parameter use to pick a specific child + device to start. + + @retval EFI_SUCCESS This driver is added to ControllerHandle. + @retval EFI_OUT_OF_RESOURCES Fails to allocate memory for device. + @retval others Some error occurs. + +**/ EFI_STATUS EFIAPI DebugPortStart ( @@ -322,21 +304,6 @@ DebugPortStart ( IN EFI_HANDLE ControllerHandle, IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath ) -/*++ - -Routine Description: - Binds exclusively to serial io on the controller handle. Produces DebugPort - protocol and DevicePath on new handle. - -Arguments: - This - ControllerHandle - RemainingDevicePath - -Returns: - EFI_OUT_OF_RESOURCES - EFI_SUCCESS ---*/ { EFI_STATUS Status; DEBUGPORT_DEVICE_PATH DebugPortDP; @@ -485,6 +452,20 @@ Returns: return EFI_SUCCESS; } +/** + Stop this driver on ControllerHandle by removing Serial IO protocol on + the ControllerHandle. + + @param This Protocol instance pointer. + @param ControllerHandle Handle of device to stop driver on + @param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of + children is zero stop the entire bus driver. + @param ChildHandleBuffer List of Child Handles to Stop. + + @retval EFI_SUCCESS This driver is removed ControllerHandle. + @retval other This driver was not removed from this device. + +**/ EFI_STATUS EFIAPI DebugPortStop ( @@ -493,20 +474,6 @@ DebugPortStop ( IN UINTN NumberOfChildren, IN EFI_HANDLE *ChildHandleBuffer ) -/*++ - -Routine Description: - We're never intending to be stopped via the driver model so this just returns - EFI_UNSUPPORTED - -Arguments: - Per EFI 1.10 driver model - -Returns: - EFI_UNSUPPORTED - EFI_SUCCESS - ---*/ { EFI_STATUS Status; @@ -575,32 +542,25 @@ Returns: return Status; } -// -// Debugport protocol member functions -// -EFI_STATUS -EFIAPI -DebugPortReset ( - IN EFI_DEBUGPORT_PROTOCOL *This - ) -/*++ -Routine Description: +/** DebugPort protocol member function. Calls SerialIo:GetControl to flush buffer. We cannot call SerialIo:SetAttributes because it uses pool services, which use locks, which affect TPL, so it's not interrupt context safe or re-entrant. SerialIo:Reset() calls SetAttributes, so it can't be used either. - - The port itself should be fine since it was set up during initialization. - -Arguments: - This -Returns: + The port itself should be fine since it was set up during initialization. + + @param This Protocol instance pointer. - EFI_SUCCESS + @return EFI_SUCCESS Always. ---*/ +**/ +EFI_STATUS +EFIAPI +DebugPortReset ( + IN EFI_DEBUGPORT_PROTOCOL *This + ) { UINTN BufferSize; UINTN BitBucket; @@ -613,6 +573,20 @@ Returns: return EFI_SUCCESS; } +/** + DebugPort protocol member function. Calls SerialIo:Read() after setting + if it's different than the last SerialIo access. + + @param This Pointer to DebugPort protocol. + @param Timeout Timeout value. + @param BufferSize On input, the size of Buffer. + On output, the amount of data actually written. + @param Buffer Pointer to buffer to read. + + @retval EFI_SUCCESS + @retval others + +**/ EFI_STATUS EFIAPI DebugPortRead ( @@ -621,23 +595,6 @@ DebugPortRead ( IN OUT UINTN *BufferSize, IN VOID *Buffer ) -/*++ - -Routine Description: - DebugPort protocol member function. Calls SerialIo:Read() after setting - if it's different than the last SerialIo access. - -Arguments: - IN EFI_DEBUGPORT_PROTOCOL *This - IN UINT32 Timeout, - IN OUT UINTN *BufferSize, - IN VOID *Buffer - -Returns: - - EFI_STATUS - ---*/ { DEBUGPORT_DEVICE *DebugPortDevice; UINTN LocalBufferSize; @@ -672,6 +629,21 @@ Returns: return Status; } +/** + DebugPort protocol member function. Calls SerialIo:Write() Writes 8 bytes at + a time and does a GetControl between 8 byte writes to help insure reads are + interspersed This is poor-man's flow control. + + @param This Pointer to DebugPort protocol. + @param Timeout Timeout value. + @param BufferSize On input, the size of Buffer. + On output, the amount of data actually written. + @param Buffer Pointer to buffer to read. + + @retval EFI_SUCCESS The data was written. + @retval others Fails when writting datas to debug port device. + +**/ EFI_STATUS EFIAPI DebugPortWrite ( @@ -680,26 +652,6 @@ DebugPortWrite ( IN OUT UINTN *BufferSize, OUT VOID *Buffer ) -/*++ - -Routine Description: - DebugPort protocol member function. Calls SerialIo:Write() Writes 8 bytes at - a time and does a GetControl between 8 byte writes to help insure reads are - interspersed This is poor-man's flow control.. - -Arguments: - This - Pointer to DebugPort protocol - Timeout - Timeout value - BufferSize - On input, the size of Buffer. - On output, the amount of data actually written. - Buffer - Pointer to buffer to write - -Returns: - EFI_SUCCESS - The data was written. - EFI_DEVICE_ERROR - The device reported an error. - EFI_TIMEOUT - The data write was stopped due to a timeout. - ---*/ { DEBUGPORT_DEVICE *DebugPortDevice; UINTN Position; @@ -731,26 +683,24 @@ Returns: return Status; } +/** + DebugPort protocol member function. Calls SerialIo:Write() after setting + if it's different than the last SerialIo access. + + @param This Pointer to DebugPort protocol. + + @retval EFI_SUCCESS At least 1 character is ready to be read from + the DebugPort interface. + @retval EFI_NOT_READY There are no characters ready to read from the + DebugPort interface + @retval EFI_DEVICE_ERROR A hardware failure occured... (from SerialIo) + +**/ EFI_STATUS EFIAPI DebugPortPoll ( IN EFI_DEBUGPORT_PROTOCOL *This ) -/*++ - -Routine Description: - DebugPort protocol member function. Calls SerialIo:Write() after setting - if it's different than the last SerialIo access. - -Arguments: - IN EFI_DEBUGPORT_PROTOCOL *This - -Returns: - EFI_SUCCESS - At least 1 character is ready to be read from the DebugPort interface - EFI_NOT_READY - There are no characters ready to read from the DebugPort interface - EFI_DEVICE_ERROR - A hardware failure occured... (from SerialIo) - ---*/ { EFI_STATUS Status; UINT32 SerialControl; @@ -764,7 +714,7 @@ Returns: ); if (!EFI_ERROR (Status)) { - if (SerialControl & EFI_SERIAL_INPUT_BUFFER_EMPTY) { + if ((SerialControl & EFI_SERIAL_INPUT_BUFFER_EMPTY) != 0) { Status = EFI_NOT_READY; } else { Status = EFI_SUCCESS; @@ -774,26 +724,23 @@ Returns: return Status; } -EFI_STATUS -EFIAPI -ImageUnloadHandler ( - EFI_HANDLE ImageHandle - ) -/*++ - -Routine Description: +/** Unload function that is registered in the LoadImage protocol. It un-installs protocols produced and deallocates pool used by the driver. Called by the core when unloading the driver. - -Arguments: - EFI_HANDLE ImageHandle -Returns: + @param ImageHandle - EFI_SUCCESS + @retval EFI_SUCCESS Unload Debug Port driver successfully. + @retval EFI_ABORTED Serial IO is still binding. + @retval others Fails to unload Debug Port driver. ---*/ +**/ +EFI_STATUS +EFIAPI +ImageUnloadHandler ( + EFI_HANDLE ImageHandle + ) { EFI_STATUS Status;