VgaClass.c revision 4fd606d1f5abe38e1f42c38de1d2e895166bd0f4
/** @file
VGA Class Driver that managers VGA devices and produces Simple Text Output Protocol.
Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
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
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 "VgaClass.h"
//
// EFI Driver Binding Protocol for the VGA Class Driver
//
0xa,
NULL,
};
//
// Local variables
//
//
// This list is used to define the valid extend chars.
// It also provides a mapping from Unicode to PCANSI or
// ASCII. The ASCII mapping we just made up.
//
//
{
0xc4,
L'-'
},
{
0xb3,
L'|'
},
{
0xda,
L'/'
},
{
0xbf,
L'\\'
},
{
0xc0,
L'\\'
},
{
0xd9,
L'/'
},
{
0xc3,
L'|'
},
{
0xb4,
L'|'
},
{
0xc2,
L'+'
},
{
0xc1,
L'+'
},
{
0xc5,
L'+'
},
{
0xcd,
L'-'
},
{
0xba,
L'|'
},
{
0xd5,
L'/'
},
{
0xd6,
L'/'
},
{
0xc9,
L'/'
},
{
0xb8,
L'\\'
},
{
0xb7,
L'\\'
},
{
0xbb,
L'\\'
},
{
0xd4,
L'\\'
},
{
0xd3,
L'\\'
},
{
0xc8,
L'\\'
},
{
0xbe,
L'/'
},
{
0xbd,
L'/'
},
{
0xbc,
L'/'
},
{
0xc6,
L'|'
},
{
0xc7,
L'|'
},
{
0xcc,
L'|'
},
{
0xb5,
L'|'
},
{
0xb6,
L'|'
},
{
0xb9,
L'|'
},
{
0xd1,
L'+'
},
{
0xd2,
L'+'
},
{
0xcb,
L'+'
},
{
0xcf,
L'+'
},
{
0xd0,
L'+'
},
{
0xca,
L'+'
},
{
0xd8,
L'+'
},
{
0xd7,
L'+'
},
{
0xce,
L'+'
},
{
0xdb,
L'*'
},
{
0xb0,
L'+'
},
{
0x1e,
L'^'
},
{
0x10,
L'>'
},
{
0x1f,
L'v'
},
{
0x11,
L'<'
},
{
0x3c,
L'<'
},
{
0x18,
L'^'
},
{
0x3e,
L'>'
},
{
0x19,
L'v'
},
{
0x0000,
0x00,
0x00
}
};
/**
Entrypoint of this VGA Class Driver.
This function is the entrypoint of this VGA Class Driver. It installs Driver Binding
Protocols together with Component Name Protocols.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
**/
)
{
//
// Install driver model protocol(s).
//
);
return EFI_SUCCESS;
}
/**
Internal worker function to program CRTC register via PCI I/O Protocol.
@param VgaClassDev device instance object
@param Address Address of register to write
@param Data Data to write to register.
**/
)
{
1,
);
1,
&Data
);
}
/**
Internal worker function to set cursor's position to VgaClass device
@param VgaClassDev Private data structure for device instance.
@param Column Colomn of position to set cursor to.
@param Row Row of position to set cursor to.
@param MaxColumn Max value of column.
**/
)
{
);
);
}
/**
Internal worker function to detect if a Unicode char is for Box Drawing text graphics.
@param Graphic Unicode char to test.
@param PcAnsi Pointer to PCANSI equivalent of Graphic for output.
If NULL, then PCANSI value is not returned.
@param Ascii Pointer to ASCII equivalent of Graphic for output.
If NULL, then ASCII value is not returned.
@retval TRUE Gpaphic is a supported Unicode Box Drawing character.
@retval FALSE Gpaphic is not a supported Unicode Box Drawing character.
**/
)
{
//
// Unicode drawing code charts are all in the 0x25xx range, arrows are 0x21xx.
// So first filter out values not in these 2 ranges.
//
return FALSE;
}
//
// Search UnicodeToPcAnsiOrAscii table for matching entry.
//
}
}
return TRUE;
}
}
//
// If value is not found in UnicodeToPcAnsiOrAscii table, then return FALSE.
//
return FALSE;
}
/**
Internal worker function to check whether input value is an ASCII char.
@param Char Character to check.
@retval TRUE Input value is an ASCII char.
@retval FALSE Input value is not an ASCII char.
**/
)
{
return TRUE;
}
return FALSE;
}
/**
Internal worker function to check whether input value is a unicode control char.
@param Char Character to check.
@retval TRUE Input value is a unicode control char.
@retval FALSE Input value is not a unicode control char.
**/
)
{
if (Char == CHAR_NULL || Char == CHAR_BACKSPACE || Char == CHAR_LINEFEED || Char == CHAR_CARRIAGE_RETURN) {
return TRUE;
}
return FALSE;
}
/**
Tests to see if this driver supports a given controller.
This function implments EFI_DRIVER_BINDING_PROTOCOL.Supported().
It Checks if this driver supports the controller specified. Any Controller
with VgaMiniPort Protocol and Pci I/O protocol can be supported.
@param This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@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_ALREADY_STARTED This driver is already running on this device.
@retval EFI_UNSUPPORTED This driver does not support this device.
**/
)
{
//
// Checks if Abstraction(s) needed to perform the supported test
//
NULL,
);
return Status;
}
//
// Open the IO Abstraction(s) needed to perform the supported test
//
NULL,
);
return Status;
}
return Status;
}
/**
Starts the device controller.
This function implments EFI_DRIVER_BINDING_PROTOCOL.Start().
It starts the device specified by Controller with the driver based on PCI I/O Protocol
and VgaMiniPort Protocol. It creates context for device instance and install EFI_SIMPLE_TEXT_OUT_PROTOCOL.
@param This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@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 The device was started.
@retval other Fail to start the device.
**/
)
{
(VOID **) &DevicePath
);
return Status;
}
//
// Report that VGA Class driver is being enabled
//
);
//
// Open the PCI I/O Protocol
//
);
return Status;
}
//
// Open the VGA Mini Port Protocol
//
(VOID **) &VgaMiniPort,
);
return Status;
}
//
// Allocate the private device structure
//
//
// Initialize the private device structure
//
//
// Initialize the VGA device.
//
);
goto ErrorExit;
}
);
goto ErrorExit;
}
);
goto ErrorExit;
}
);
return Status;
);
return Status;
}
/**
Starts the device controller.
This function implments EFI_DRIVER_BINDING_PROTOCOL.Stop().
It stops this driver on Controller. Support stoping any child handles
created by this driver.
@param This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param ControllerHandle A handle to the device being stopped.
@param NumberOfChildren The number of child device handles in ChildHandleBuffer.
@param ChildHandleBuffer An array of child handles to be freed.
@retval EFI_SUCCESS This driver is removed ControllerHandle
@retval other This driver was not removed from this device
**/
)
{
(VOID **) &SimpleTextOut,
);
return Status;
}
//
// Report that VGA Class driver is being disabled
//
);
);
return Status;
}
//
// Release PCI I/O and VGA Mini Port Protocols on the controller handle.
//
gBS->CloseProtocol (
);
gBS->CloseProtocol (
);
return EFI_SUCCESS;
}
/**
Resets the text output device hardware.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.Reset().
It resets the text output device hardware. The cursor position is set to (0, 0),
and the screen is cleared to the default background color for the output device.
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param ExtendedVerification Indicates that the driver may perform a more exhaustive
verification operation of the device during reset.
@retval EFI_SUCCESS The text output device was reset.
@retval EFI_DEVICE_ERROR The text output device is not functioning correctly and could not be reset.
**/
)
{
);
return Status;
}
}
/**
Writes a Unicode string to the output device.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString().
It writes a Unicode string to the output device. This is the most basic output mechanism
on an output device.
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param String The Null-terminated Unicode string to be displayed on the output device(s).
@retval EFI_SUCCESS The string was output to the device.
@retval EFI_DEVICE_ERROR The device reported an error while attempting to output the text.
@retval EFI_UNSUPPORTED The output device's mode is not currently in a defined text mode.
@retval EFI_WARN_UNKNOWN_GLYPH This warning code indicates that some of the characters in
the Unicode string could not be rendered and were skipped.
**/
)
{
This,
);
return Status;
}
//
// Parse each character of the string to output
//
switch (*String) {
case CHAR_BACKSPACE:
if (Mode->CursorColumn > 0) {
Mode->CursorColumn--;
}
break;
case CHAR_LINEFEED:
//
// Scroll the screen by copying the contents
// of the VGA display up one line
//
);
//
// Print Blank Line of spaces with the current color attributes
//
MaxColumn >> 1,
);
}
}
break;
case CHAR_CARRIAGE_RETURN:
Mode->CursorColumn = 0;
break;
default:
//
// If this character is not ,Box Drawing text graphics, then convert it to ASCII.
//
if (!IsValidAscii (GraphicChar)) {
//
// If not valid ASCII char, convert it to "?"
//
GraphicChar = '?';
}
}
VgaClassDev->VgaMiniPort->VgaMemoryOffset + ((Mode->CursorRow * MaxColumn + Mode->CursorColumn) * 2),
1,
);
} else {
Mode->CursorColumn++;
}
break;
}
}
);
return EFI_SUCCESS;
}
/**
Verifies that all characters in a Unicode string can be output to the target device.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.TestString().
It verifies that all characters in a Unicode string can be output to the target device.
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param String The Null-terminated Unicode string to be examined for the output device(s).
@retval EFI_SUCCESS The device(s) are capable of rendering the output string.
@retval EFI_UNSUPPORTED Some of the characters in the Unicode string cannot be rendered by
one or more of the output devices mapped by the EFI handle.
**/
)
{
if (!(IsValidAscii (*String) || IsValidEfiCntlChar (*String) || LibIsValidTextGraphics (*String, NULL, NULL))) {
return EFI_UNSUPPORTED;
}
String++;
}
return EFI_SUCCESS;
}
/**
Clears the output device(s) display to the currently selected background color.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.ClearScreen().
The ClearScreen() function clears the output device(s) display to the currently
selected background color. The cursor position is set to (0, 0).
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@retval EFI_SUCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request.
@retval EFI_UNSUPPORTED The output device is not in a valid text mode.
**/
)
{
This,
);
return Status;
}
);
return EFI_SUCCESS;
}
/**
Sets the background and foreground colors for theOutputString() and ClearScreen() functions.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.SetAttribute().
It sets the background and foreground colors for the OutputString() and ClearScreen() functions.
The color mask can be set even when the device is in an invalid text mode.
Devices supporting a different number of text colors are required to emulate the above colors
to the best of the device's capabilities.
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param Attribute The attribute to set.
Bits 0..3 are the foreground color,
and bits 4..6 are the background color.
@retval EFI_SUCCESS The requested attributes were set.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request.
**/
)
{
if (Attribute <= EFI_MAX_ATTRIBUTE) {
return EFI_SUCCESS;
}
return EFI_UNSUPPORTED;
}
/**
Sets the current coordinates of the cursor position.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.SetCursorPosition().
It sets the current coordinates of the cursor position.
The upper left corner of the screen is defined as coordinate (0, 0).
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param Column Column of position to set the cursor to.
@param Row Row of position to set the cursor to.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request.
@retval EFI_UNSUPPORTED The output device is not in a valid text mode, or the cursor
position is invalid for the current mode.
**/
)
{
This,
);
return Status;
}
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/**
Makes the cursor visible or invisible.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.EnableCursor().
It makes the cursor visible or invisible.
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param Visible If TRUE, the cursor is set to be visible.
If FALSE, the cursor is set to be invisible.
@retval EFI_SUCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request or the
device does not support changing the cursor mode.
@retval EFI_UNSUPPORTED The output device does not support visibility control of the cursor.
**/
)
{
if (Visible) {
//
// 80 * 50
//
} else {
//
// 80 * 25
//
}
} else {
}
return EFI_SUCCESS;
}
/**
Returns information for an available text mode that the output device(s) supports.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.QueryMode().
It returns information for an available text mode that the output device(s) supports.
It is required that all output devices support at least 80x25 text mode. This mode is defined to be mode 0.
If the output devices support 80x50, that is defined to be mode 1.
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param ModeNumber The mode number to return information on.
@param Columns Columen in current mode number
@param Rows Row in current mode number.
@retval EFI_SUCCESS The requested mode information was returned.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request.
@retval EFI_UNSUPPORTED The mode number was not valid.
**/
)
{
*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;
}
/**
Sets the output device(s) to a specified mode.
This function implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.QueryMode().
It sets the output device(s) to the requested mode.
On success the device is in the geometry for the requested mode,
and the device has been cleared to the current background color with the cursor at (0,0).
@param This Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL instance.
@param ModeNumber The text mode to set.
@retval EFI_SUCCESS The requested text mode was set.
@retval EFI_DEVICE_ERROR The device had an error and could not complete the request.
@retval EFI_UNSUPPORTED The mode number was not valid.
**/
)
{
return EFI_UNSUPPORTED;
}
}