#include <Vga.h>

Inheritance diagram for X86Vga:

Collaboration diagram for X86Vga:

Public Member Functions
	X86Vga (uint32_t nRegisterBase, uint32_t nFramebufferBase)

virtual void	setControl (VgaControl which)

virtual void	clearControl (VgaControl which)

virtual bool	setMode (int mode)

virtual bool	setLargestTextMode ()

virtual bool	isMode (size_t nCols, size_t nRows, bool bIsText, size_t nBpp=0)

virtual bool	isLargestTextMode ()

virtual size_t	getNumCols ()

virtual size_t	getNumRows ()

virtual void	rememberMode ()

virtual void	restoreMode ()

virtual void	pokeBuffer (uint8_t *pBuffer, size_t nBufLen)

virtual void	peekBuffer (uint8_t *pBuffer, size_t nBufLen)

virtual void	moveCursor (size_t nX, size_t nY)

bool	initialise ()

	operator uint16_t * () const

Private Member Functions
	X86Vga (const X86Vga &)

X86Vga &	operator= (const X86Vga &)

uint8_t	getControls ()

void	setControls (uint8_t newControls)

Private Attributes
IoPort	m_RegisterPort

MemoryMappedIo	m_Framebuffer

uint8_t *	m_pFramebuffer

size_t	m_nWidth

size_t	m_nHeight

int	m_ModeStack

int	m_nMode

uint8_t	m_nControls

Additional Inherited Members
Public Types inherited from Vga
enum	VgaControl { LineGraphics = 2, Blink = 3 }

Detailed Description

Vga device abstraction.

Definition at line 60 of file kernel/machine/mach_pc/Vga.h.

Member Function Documentation

void X86Vga::clearControl ( Vga::VgaControl which )

virtual

Clears the given attribute mode control.

Implements Vga.

Definition at line 66 of file kernel/machine/mach_pc/Vga.cc.

virtual size_t X86Vga::getNumCols ( )

inlinevirtual

Returns: The number of columns in the current mode.

Implements Vga.

Definition at line 100 of file kernel/machine/mach_pc/Vga.h.

References m_nWidth.

virtual size_t X86Vga::getNumRows ( )

inlinevirtual

Returns: The number of rows in the current mode.

Implements Vga.

Definition at line 108 of file kernel/machine/mach_pc/Vga.h.

References m_nHeight, m_pFramebuffer, moveCursor(), peekBuffer(), pokeBuffer(), rememberMode(), restoreMode(), and MemoryRegion::virtualAddress().

bool X86Vga::isLargestTextMode ( )

virtual

Tests if the current video mode is the largest text mode.

Returns: True if the current video mode is equal to the largest text mode.

Implements Vga.

Definition at line 89 of file kernel/machine/mach_pc/Vga.cc.

bool X86Vga::isMode	(	size_t	nCols,
		size_t	nRows,
		bool	bIsText,
		size_t	nBpp = `0`
	)

virtual

Tests the current video mode.

Returns: True if the current mode matches the given arguments.

Implements Vga.

Definition at line 84 of file kernel/machine/mach_pc/Vga.cc.

void X86Vga::moveCursor	(	size_t	nX,
		size_t	nY
	)

virtual

Moves the cursor to the position specified by the parameters.

Parameters

nX	The column to move to.
nY	The row to move to.

Implements Vga.

Definition at line 148 of file kernel/machine/mach_pc/Vga.cc.

References PhysicalMemoryManager::allocateRegion(), PhysicalMemoryManager::continuous, PhysicalMemoryManager::instance(), VirtualAddressSpace::KernelMode, HostedVga::m_nControls, HostedVga::m_nWidth, PhysicalMemoryManager::nonRamMemory, VirtualAddressSpace::Write, and VirtualAddressSpace::WriteThrough.

Referenced by getNumRows().

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void X86Vga::peekBuffer	(	uint8_t *	pBuffer,
		size_t	nBufLen
	)

virtual

Copies the current framebuffer into the given buffer.

The buffer is assumed to be in the correct format for directly copying from video memory. This will obviously depend on the current mode (text/graphical) as well as resolution and bits per pixel (graphics mode only).

Parameters

pBuffer	A pointer to the buffer.
nBufLen	The length of pBuffer.

Implements Vga.

Definition at line 140 of file kernel/machine/mach_pc/Vga.cc.

Referenced by getNumRows().

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void X86Vga::pokeBuffer	(	uint8_t *	pBuffer,
		size_t	nBufLen
	)

virtual

Copies the given buffer into video memory, replacing the current framebuffer.

The buffer is assumed to be in the correct format for directly copying into video memory. This will obviously depend on the current mode (text/graphical) as well as resolution and bits per pixel (graphics mode only).

Parameters

pBuffer	A pointer to the buffer to swap into video memory.
nBufLen	The length of pBuffer.

Implements Vga.

Definition at line 130 of file kernel/machine/mach_pc/Vga.cc.

Referenced by getNumRows().

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void X86Vga::rememberMode ( )

virtual

Stores the current video mode.

Implements Vga.

Definition at line 94 of file kernel/machine/mach_pc/Vga.cc.

References Bios::executeInterrupt(), Bios::instance(), HostedVga::m_ModeStack, HostedVga::m_nControls, Bios::setAx(), Bios::setBx(), Bios::setDi(), and Bios::setEs().

Referenced by getNumRows().

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void X86Vga::restoreMode ( )

virtual

Restores the saved video mode from a rememberMode() call.

Implements Vga.

Definition at line 111 of file kernel/machine/mach_pc/Vga.cc.

References Bios::executeInterrupt(), Bios::instance(), HostedVga::m_ModeStack, HostedVga::m_nControls, HostedVga::m_nMode, Bios::setAx(), Bios::setBx(), Bios::setDi(), and Bios::setEs().

Referenced by getNumRows().

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void X86Vga::setControl ( Vga::VgaControl which )

virtual

Sets the given attribute mode control.

Implements Vga.

Definition at line 59 of file kernel/machine/mach_pc/Vga.cc.

bool X86Vga::setLargestTextMode ( )

virtual

Sets the largest possible text mode.

Returns: True on success, false on failure.

Implements Vga.

Definition at line 79 of file kernel/machine/mach_pc/Vga.cc.

bool X86Vga::setMode ( int mode )

virtual

Changes the mode the VGA device is in.

Parameters

nCols	The number of columns required.
nRows	The number of rows required.
bIsText	True if the caller requires a text mode, false if graphical.
nBpp	Only applicable for graphics modes - the number of bits per pixel.

Returns: True on success, false on failure.

Implements Vga.

Definition at line 73 of file kernel/machine/mach_pc/Vga.cc.

References HostedVga::m_nMode.

Member Data Documentation

int X86Vga::m_ModeStack

private

We keep a count of the number of times we've entered the debugger without leaving it - when we enter the debugger, we increment this. When we leave, we decrement. If we leave and it reaches zero, we change out of mode 0x3 into the current video mode.

Definition at line 198 of file kernel/machine/mach_pc/Vga.h.

uint8_t X86Vga::m_nControls

private

Most recent VGA controls (as these get reset on mode change).

Definition at line 208 of file kernel/machine/mach_pc/Vga.h.

size_t X86Vga::m_nHeight

private

The height of the current mode.

Definition at line 190 of file kernel/machine/mach_pc/Vga.h.

Referenced by getNumRows().

int X86Vga::m_nMode

private