winntugainput.c

来自「Next BIOS Source code : Extensible Firmw」· C语言 代码 · 共 264 行

/*++

Copyright (c)  1999 - 2002 Intel Corporation. All rights reserved
This software and associated documentation (if any) is furnished
under a license and may only be used or copied in accordance
with the terms of the license. Except as permitted by such
license, no part of this software or documentation may be
reproduced, stored in a retrieval system, or transmitted in any
form or by any means without the express written consent of
Intel Corporation.


Module Name:

  WinNtUgaInput.c

Abstract:

  This file produces the Simple Text In for an Uga window. 

  This stuff is linked at the hip to the Window, since the window
  processing is done in a thread kicked off in WinNtUgaImplementation.c

  Since the window information is processed in an other thread we need
  a keyboard Queue to pass data about. The Simple Text In code just 
  takes data off the Queue. The WinProc message loop takes keyboard input
  and places it in the Queue.

--*/

#include "WinNtUga.h"

EFI_STATUS
UgaPrivateCreateQ (
  IN  UGA_PRIVATE_DATA    *Private
  )
{
  Private->WinNtThunk->InitializeCriticalSection (&Private->QCriticalSection);

  Private->Queue.Front = 0;
  Private->Queue.Rear  = MAX_Q - 1;
  Private->Queue.Count = 0;
  return EFI_SUCCESS;
}


EFI_STATUS
UgaPrivateDestroyQ (
  IN  UGA_PRIVATE_DATA    *Private
  )
{
  Private->Queue.Count = 0;
  Private->WinNtThunk->DeleteCriticalSection (&Private->QCriticalSection);
  return EFI_SUCCESS;
}


EFI_STATUS
UgaPrivateAddQ (
  IN  UGA_PRIVATE_DATA    *Private,
  IN  EFI_INPUT_KEY       Key
  )
{
  Private->WinNtThunk->EnterCriticalSection (&Private->QCriticalSection);
  
  if (Private->Queue.Count == MAX_Q) {
     Private->WinNtThunk->LeaveCriticalSection (&Private->QCriticalSection);
    return EFI_NOT_READY;
  }
  Private->Queue.Rear = (Private->Queue.Rear + 1) % MAX_Q;
  Private->Queue.Q[Private->Queue.Rear] = Key;
  Private->Queue.Count++;

  Private->WinNtThunk->LeaveCriticalSection (&Private->QCriticalSection);
  return EFI_SUCCESS;
}


EFI_STATUS
UgaPrivateDeleteQ (
  IN  UGA_PRIVATE_DATA    *Private,
  OUT EFI_INPUT_KEY       *Key
  )
{
  Private->WinNtThunk->EnterCriticalSection (&Private->QCriticalSection);
  
  if (Private->Queue.Count == 0) {
    Private->WinNtThunk->LeaveCriticalSection (&Private->QCriticalSection);
    return EFI_NOT_READY;
  }
  
  *Key = Private->Queue.Q[Private->Queue.Front];
  Private->Queue.Front = (Private->Queue.Front + 1) % MAX_Q;
  Private->Queue.Count--;

  Private->WinNtThunk->LeaveCriticalSection (&Private->QCriticalSection);
  return EFI_SUCCESS;
}


EFI_STATUS
UgaPrivateCheckQ (
  IN  UGA_PRIVATE_DATA    *Private
  )
{
  if (Private->Queue.Count == 0) {
    return EFI_NOT_READY;
  }

  return EFI_SUCCESS;
}


//
// Simple Text In implementation.
//

EFI_STATUS
EFIAPI
WinNtUgaSimpleTextInReset (
  IN struct _EFI_SIMPLE_TEXT_IN_PROTOCOL  *This,
  IN BOOLEAN                              ExtendedVerification
  )
{
  UGA_PRIVATE_DATA  *Private;
  EFI_INPUT_KEY     Key;
  EFI_TPL           OldTpl;
  
  Private = UGA_PRIVATE_DATA_FROM_TEXT_IN_THIS (This);

  //    
  // Enter critical section
  //
  OldTpl = gBS->RaiseTPL (EFI_TPL_NOTIFY);

  //
  // A reset is draining the Queue
  //
  while (UgaPrivateDeleteQ (Private, &Key) == EFI_SUCCESS);

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);
  return EFI_SUCCESS;
}


STATIC
EFI_STATUS
EFIAPI 
WinNtUgaSimpleTextInReadKeyStroke (
  IN struct _EFI_SIMPLE_TEXT_IN_PROTOCOL  *This,
  OUT EFI_INPUT_KEY                       *Key
  )
{
  UGA_PRIVATE_DATA    *Private;
  EFI_STATUS          Status;
  EFI_TPL             OldTpl;
  
  Private = UGA_PRIVATE_DATA_FROM_TEXT_IN_THIS (This);

  //    
  // Enter critical section
  //
  OldTpl = gBS->RaiseTPL (EFI_TPL_NOTIFY);

  Status = UgaPrivateCheckQ (Private);
  if (!EFI_ERROR (Status)) {
    //
    // If a Key press exists try and read it.
    //
    Status = UgaPrivateDeleteQ (Private, Key);
  }

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);

  return Status;
}


STATIC
VOID
EFIAPI
WinNtUgaSimpleTextInWaitForKey (
    IN EFI_EVENT          Event,
    IN VOID               *Context
  )
{
  UGA_PRIVATE_DATA  *Private;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;
  
  Private = (UGA_PRIVATE_DATA *)Context;

  //    
  // Enter critical section
  //
  OldTpl = gBS->RaiseTPL (EFI_TPL_NOTIFY);

  Status = UgaPrivateCheckQ (Private);
  if (!EFI_ERROR(Status)) {
    //
    // If a there is a key in the queue signal our event.
    //
    gBS->SignalEvent (Event);
  } else {
    //
    // We need to sleep or NT will schedule this thread with such high 
    // priority that WinProc thread will never run and we will not see
    // keyboard input. This Sleep makes the syste run 10x faster, so don't
    // remove it.
    //
    Private->WinNtThunk->Sleep (1);
  }

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);
}



EFI_STATUS
WinNtUgaInitializeSimpleTextInForWindow (
  IN  UGA_PRIVATE_DATA    *Private
  )
{
  EFI_STATUS    Status;


  UgaPrivateCreateQ (Private);
  
  //
  // Initialize Simple Text In protoocol
  //
  Private->SimpleTextIn.Reset = WinNtUgaSimpleTextInReset;
  Private->SimpleTextIn.ReadKeyStroke = WinNtUgaSimpleTextInReadKeyStroke;
  
  Status = gBS->CreateEvent (
                  EFI_EVENT_NOTIFY_WAIT,
                  EFI_TPL_NOTIFY,
                  WinNtUgaSimpleTextInWaitForKey,
                  Private,
                  &Private->SimpleTextIn.WaitForKey
                  );
  
  return Status;
}


EFI_STATUS
WinNtUgaDestroySimpleTextInForWindow (
  IN  UGA_PRIVATE_DATA    *Private
  )
{
  UgaPrivateDestroyQ (Private);
  return EFI_SUCCESS;
}