vgaclass.c

来自「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是」· C语言代码 · 共 1,318 行 · 第 1/2 页
1,318 行
VgaClassOutputString (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  CHAR16                          *WString
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This    - GC_TODO: add argument description
  WString - GC_TODO: add argument description

Returns:

  EFI_SUCCESS - GC_TODO: Add description for return value

--*/
{
  EFI_STATUS                  Status;
  VGA_CLASS_DEV               *VgaClassDev;
  EFI_SIMPLE_TEXT_OUTPUT_MODE *Mode;
  UINTN                       MaxColumn;
  UINTN                       MaxRow;
  CHAR16                      *SavedWString;
  UINT32                      VideoChar;
  CHAR8                       GraphicChar;

  VgaClassDev = VGA_CLASS_DEV_FROM_THIS (This);

  Mode        = This->Mode;

  Status = This->QueryMode (
                  This,
                  Mode->Mode,
                  &MaxColumn,
                  &MaxRow
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  SavedWString = WString;
  for (; *WString != CHAR_NULL; WString++) {

    switch (*WString) {
    case CHAR_BACKSPACE:
      if (Mode->CursorColumn > 0) {
        Mode->CursorColumn--;
      }
      break;

    case CHAR_LINEFEED:
      if (Mode->CursorRow == (INT32) (MaxRow - 1)) {
        //
        // Scroll the screen by copying the contents
        // of the VGA display up one line
        //
        VgaClassDev->PciIo->CopyMem (
                              VgaClassDev->PciIo,
                              EfiPciIoWidthUint32,
                              VgaClassDev->VgaMiniPort->VgaMemoryBar,
                              VgaClassDev->VgaMiniPort->VgaMemoryOffset,
                              VgaClassDev->VgaMiniPort->VgaMemoryBar,
                              VgaClassDev->VgaMiniPort->VgaMemoryOffset + MaxColumn * 2,
                              ((MaxRow - 1) * MaxColumn) >> 1
                              );

        //
        // Print Blank Line of spaces with the current color attributes
        //
        VideoChar = (Mode->Attribute << 8) | ' ';
        VideoChar = (VideoChar << 16) | VideoChar;
        VgaClassDev->PciIo->Mem.Write (
                                  VgaClassDev->PciIo,
                                  EfiPciIoWidthFillUint32,
                                  VgaClassDev->VgaMiniPort->VgaMemoryBar,
                                  VgaClassDev->VgaMiniPort->VgaMemoryOffset + (MaxRow - 1) * MaxColumn * 2,
                                  MaxColumn >> 1,
                                  &VideoChar
                                  );
      }

      if (Mode->CursorRow < (INT32) (MaxRow - 1)) {
        Mode->CursorRow++;
      }
      break;

    case CHAR_CARRIAGE_RETURN:
      Mode->CursorColumn = 0;
      break;

    default:
      if (!LibIsValidTextGraphics (*WString, &GraphicChar, NULL)) {
        //
        // Just convert to ASCII
        //
        GraphicChar = (CHAR8) *WString;
        if (!IsValidAscii (GraphicChar)) {
          //
          // Keep the API from supporting PCANSI Graphics chars
          //
          GraphicChar = '?';
        }
      }

      VideoChar = (Mode->Attribute << 8) | GraphicChar;
      VgaClassDev->PciIo->Mem.Write (
                                VgaClassDev->PciIo,
                                EfiPciIoWidthUint16,
                                VgaClassDev->VgaMiniPort->VgaMemoryBar,
                                VgaClassDev->VgaMiniPort->VgaMemoryOffset + ((Mode->CursorRow * MaxColumn + Mode->CursorColumn) * 2),
                                1,
                                &VideoChar
                                );

      if (Mode->CursorColumn >= (INT32) (MaxColumn - 1)) {
        This->OutputString (This, CrLfString);
      } else {
        Mode->CursorColumn++;
      }
      break;
    }
  }

  SetVideoCursorPosition (
    VgaClassDev,
    (UINTN) Mode->CursorColumn,
    (UINTN) Mode->CursorRow,
    MaxColumn
    );

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
VgaClassTestString (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  CHAR16                          *WString
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This    - GC_TODO: add argument description
  WString - GC_TODO: add argument description

Returns:

  EFI_UNSUPPORTED - GC_TODO: Add description for return value
  EFI_SUCCESS - GC_TODO: Add description for return value

--*/
{
  while (*WString != 0x0000) {
    if (!(IsValidAscii (*WString) || IsValidEfiCntlChar (*WString) || LibIsValidTextGraphics (*WString, NULL, NULL))) {
      return EFI_UNSUPPORTED;
    }

    WString++;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
VgaClassClearScreen (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This  - GC_TODO: add argument description

Returns:

  EFI_SUCCESS - GC_TODO: Add description for return value

--*/
{
  EFI_STATUS    Status;
  VGA_CLASS_DEV *VgaClassDev;
  UINTN         MaxRow;
  UINTN         MaxColumn;
  UINT32        VideoChar;

  VgaClassDev = VGA_CLASS_DEV_FROM_THIS (This);

  Status = This->QueryMode (
                  This,
                  This->Mode->Mode,
                  &MaxColumn,
                  &MaxRow
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  VideoChar = (This->Mode->Attribute << 8) | ' ';
  VideoChar = (VideoChar << 16) | VideoChar;
  VgaClassDev->PciIo->Mem.Write (
                            VgaClassDev->PciIo,
                            EfiPciIoWidthFillUint32,
                            VgaClassDev->VgaMiniPort->VgaMemoryBar,
                            VgaClassDev->VgaMiniPort->VgaMemoryOffset,
                            (MaxRow * MaxColumn) >> 1,
                            &VideoChar
                            );

  This->SetCursorPosition (This, 0, 0);

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
VgaClassSetAttribute (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  UINTN                           Attribute
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This      - GC_TODO: add argument description
  Attribute - GC_TODO: add argument description

Returns:

  EFI_SUCCESS - GC_TODO: Add description for return value
  EFI_UNSUPPORTED - GC_TODO: Add description for return value

--*/
{
  if (Attribute >= 0 && Attribute <= EFI_MAX_ATTRIBUTE) {
    This->Mode->Attribute = (INT32) Attribute;
    return EFI_SUCCESS;
  }

  return EFI_UNSUPPORTED;
}

EFI_STATUS
EFIAPI
VgaClassSetCursorPosition (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  UINTN                           Column,
  IN  UINTN                           Row
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This    - GC_TODO: add argument description
  Column  - GC_TODO: add argument description
  Row     - GC_TODO: add argument description

Returns:

  EFI_UNSUPPORTED - GC_TODO: Add description for return value
  EFI_SUCCESS - GC_TODO: Add description for return value

--*/
{
  EFI_STATUS    Status;
  VGA_CLASS_DEV *VgaClassDev;
  UINTN         MaxColumn;
  UINTN         MaxRow;

  VgaClassDev = VGA_CLASS_DEV_FROM_THIS (This);

  Status = This->QueryMode (
                  This,
                  This->Mode->Mode,
                  &MaxColumn,
                  &MaxRow
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  if (Column >= MaxColumn || Row >= MaxRow) {
    return EFI_UNSUPPORTED;
  }

  SetVideoCursorPosition (VgaClassDev, Column, Row, MaxColumn);

  This->Mode->CursorColumn  = (INT32) Column;
  This->Mode->CursorRow     = (INT32) Row;

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
VgaClassEnableCursor (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  BOOLEAN                         Visible
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This    - GC_TODO: add argument description
  Visible - GC_TODO: add argument description

Returns:

  EFI_SUCCESS - GC_TODO: Add description for return value

--*/
{
  VGA_CLASS_DEV *VgaClassDev;

  VgaClassDev = VGA_CLASS_DEV_FROM_THIS (This);
  if (Visible) {
    switch (This->Mode->Mode) {
    case 1:
      WriteCrtc (VgaClassDev, CRTC_CURSOR_START, 0x06);
      WriteCrtc (VgaClassDev, CRTC_CURSOR_END, 0x07);
      break;

    default:
      WriteCrtc (VgaClassDev, CRTC_CURSOR_START, 0x0e);
      WriteCrtc (VgaClassDev, CRTC_CURSOR_END, 0x0f);
      break;
    }
  } else {
    WriteCrtc (VgaClassDev, CRTC_CURSOR_START, 0x20);
  }

  This->Mode->CursorVisible = Visible;
  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
VgaClassQueryMode (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  UINTN                           ModeNumber,
  OUT UINTN                           *Columns,
  OUT UINTN                           *Rows
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This        - GC_TODO: add argument description
  ModeNumber  - GC_TODO: add argument description
  Columns     - GC_TODO: add argument description
  Rows        - GC_TODO: add argument description

Returns:

  EFI_UNSUPPORTED - GC_TODO: Add description for return value
  EFI_UNSUPPORTED - GC_TODO: Add description for return value
  EFI_SUCCESS - GC_TODO: Add description for return value

--*/
{
  VGA_CLASS_DEV *VgaClassDev;

  VgaClassDev = VGA_CLASS_DEV_FROM_THIS (This);

  if ((INT32) ModeNumber >= This->Mode->MaxMode) {
    *Columns  = 0;
    *Rows     = 0;
    return EFI_UNSUPPORTED;
  }

  switch (ModeNumber) {
  case 0:
    *Columns  = 80;
    *Rows     = 25;
    break;

  case 1:
    *Columns  = 80;
    *Rows     = 50;
    break;

  default:
    *Columns  = 0;
    *Rows     = 0;
    return EFI_UNSUPPORTED;
  }

  return EFI_SUCCESS;
}

EFI_STATUS
EFIAPI
VgaClassSetMode (
  IN  EFI_SIMPLE_TEXT_OUT_PROTOCOL    *This,
  IN  UINTN                           ModeNumber
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  This        - GC_TODO: add argument description
  ModeNumber  - GC_TODO: add argument description

Returns:

  EFI_UNSUPPORTED - GC_TODO: Add description for return value

--*/
{
  EFI_STATUS    Status;
  VGA_CLASS_DEV *VgaClassDev;

  VgaClassDev = VGA_CLASS_DEV_FROM_THIS (This);

  if ((INT32) ModeNumber >= This->Mode->MaxMode) {
    return EFI_UNSUPPORTED;
  }

  This->ClearScreen (This);

  This->Mode->Mode  = (INT32) ModeNumber;

  Status            = VgaClassDev->VgaMiniPort->SetMode (VgaClassDev->VgaMiniPort, ModeNumber);

  return Status;
}
//
// Private Worker Functions
//
STATIC
VOID
SetVideoCursorPosition (
  IN  VGA_CLASS_DEV  *VgaClassDev,
  IN  UINTN          Column,
  IN  UINTN          Row,
  IN  UINTN          MaxColumn
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  VgaClassDev - GC_TODO: add argument description
  Column      - GC_TODO: add argument description
  Row         - GC_TODO: add argument description
  MaxColumn   - GC_TODO: add argument description

Returns:

  GC_TODO: add return values

--*/
{
  Column    = Column & 0xff;
  Row       = Row & 0xff;
  MaxColumn = MaxColumn & 0xff;
  WriteCrtc (
    VgaClassDev,
    CRTC_CURSOR_LOCATION_HIGH,
    (UINT8) ((Row * MaxColumn + Column) >> 8)
    );
  WriteCrtc (
    VgaClassDev,
    CRTC_CURSOR_LOCATION_LOW,
    (UINT8) ((Row * MaxColumn + Column) & 0xff)
    );
}

STATIC
VOID
WriteCrtc (
  IN  VGA_CLASS_DEV  *VgaClassDev,
  IN  UINT16         Address,
  IN  UINT8          Data
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  VgaClassDev - GC_TODO: add argument description
  Address     - GC_TODO: add argument description
  Data        - GC_TODO: add argument description

Returns:

  GC_TODO: add return values

--*/
{
  VgaClassDev->PciIo->Io.Write (
                          VgaClassDev->PciIo,
                          EfiPciIoWidthUint8,
                          VgaClassDev->VgaMiniPort->CrtcAddressRegisterBar,
                          VgaClassDev->VgaMiniPort->CrtcAddressRegisterOffset,
                          1,
                          &Address
                          );

  VgaClassDev->PciIo->Io.Write (
                          VgaClassDev->PciIo,
                          EfiPciIoWidthUint8,
                          VgaClassDev->VgaMiniPort->CrtcDataRegisterBar,
                          VgaClassDev->VgaMiniPort->CrtcDataRegisterOffset,
                          1,
                          &Data
                          );
}

STATIC
BOOLEAN
LibIsValidTextGraphics (
  IN  CHAR16  Graphic,
  OUT CHAR8   *PcAnsi, OPTIONAL
  OUT CHAR8   *Ascii OPTIONAL
  )
/*++

Routine Description:

    Detects if a Unicode char is for Box Drawing text graphics.

Arguments:

    Grphic  - Unicode char to test.

    PcAnsi  - Optional pointer to return PCANSI equivalent of Graphic.

    Asci    - Optional pointer to return Ascii equivalent of Graphic.

Returns:

    TRUE if Gpaphic is a supported Unicode Box Drawing character.

--*/
// GC_TODO:    Graphic - add argument and description to function comment
{
  UNICODE_TO_CHAR *Table;

  if ((((Graphic & 0xff00) != 0x2500) && ((Graphic & 0xff00) != 0x2100))) {
    //
    // Unicode drawing code charts are all in the 0x25xx range,
    //  arrows are 0x21xx
    //
    return FALSE;
  }

  for (Table = UnicodeToPcAnsiOrAscii; Table->Unicode != 0x0000; Table++) {
    if (Graphic == Table->Unicode) {
      if (PcAnsi) {
        *PcAnsi = Table->PcAnsi;
      }

      if (Ascii) {
        *Ascii = Table->Ascii;
      }

      return TRUE;
    }
  }

  return FALSE;
}

STATIC
BOOLEAN
IsValidAscii (
  IN  CHAR16  Ascii
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  Ascii - GC_TODO: add argument description

Returns:

  GC_TODO: add return values

--*/
{
  if ((Ascii >= 0x20) && (Ascii <= 0x7f)) {
    return TRUE;
  }

  return FALSE;
}

STATIC
BOOLEAN
IsValidEfiCntlChar (
  IN  CHAR16  c
  )
/*++

Routine Description:

  GC_TODO: Add function description

Arguments:

  c - GC_TODO: add argument description

Returns:

  GC_TODO: add return values

--*/
{
  if (c == CHAR_NULL || c == CHAR_BACKSPACE || c == CHAR_LINEFEED || c == CHAR_CARRIAGE_RETURN) {
    return TRUE;
  }

  return FALSE;
}
vgaclass.c - 源码说明

本页面展示了「EFI BIOS是Intel提出的下一代的BIOS标准。这里上传的Edk源代码是EFI BIOS源代码中的与平台无关部分的代码」中的 vgaclass.c 源码文件，采用 C语言编程语言编写，共 1,318 行代码。您可以在线阅读完整代码内容，也可以返回资源详情页下载完整源码包进行本地学习和开发。
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