kernel/machine/ppc_common/Vga.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef MACHINE_PPC_VGA_H
#define MACHINE_PPC_VGA_H

#include "pedigree/kernel/machine/Vga.h"
#include "pedigree/kernel/processor/MemoryRegion.h"
#include "pedigree/kernel/processor/types.h"
// include <machine/openfirmware/OpenFirmware.h>
// include <machine/openfirmware/Device.h>

// We make an assumption about the device size.
#define MAX_WIDTH 1024
#define MAX_HEIGHT 800

#define FONT_WIDTH 8
#define FONT_HEIGHT 16

// Routines for taking a 0-255 set of RGB values and converting them to a 8,16
// or 32 bpp specific form.
#ifdef BIG_ENDIAN
#define RGB_8(r, g, b) (((r & 0x3) << 6) | ((g & 0x7) << 3) | (b & 0x7))
#define RGB_16(r, g, b) \
    (((r & 0x1f) << 11) | ((g & 0x1f) << 6) | ((b & 0x1f) << 1))
#define RGB_32(r, g, b) (0 | r << 24 | g << 16 | b << 8)
#else
#error Little endian not implemented here.
#endif

class PPCVga : public Vga
{
  public:
    PPCVga();
    virtual ~PPCVga();

    void initialise();

    virtual bool setMode(int mode)
    {
        return false;
    }

    virtual bool setLargestTextMode()
    {
        return false;
    }

    virtual bool
    isMode(size_t nCols, size_t nRows, bool bIsText, size_t nBpp = 0)
    {
        return false;
    }

    virtual bool isLargestTextMode()
    {
        return true;
    }

    virtual size_t getNumCols()
    {
        return m_Width / FONT_WIDTH;
    }

    virtual size_t getNumRows()
    {
        return m_Height / FONT_HEIGHT;
    }

    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)
    {
    }

    operator uint16_t *() const
    {
        return const_cast<uint16_t *>(m_pTextBuffer);
    }

  private:
    PPCVga(const PPCVga &);
    PPCVga &operator=(const PPCVga &);

    void putChar(char c, int x, int y, unsigned int f, unsigned int b);

    uint16_t
        m_pTextBuffer[(MAX_WIDTH / FONT_WIDTH) * (MAX_HEIGHT / FONT_HEIGHT)];

    MemoryRegion m_Framebuffer;

    uint8_t *m_pFramebuffer;

    uint32_t m_Width;
    uint32_t m_Height;
    uint32_t m_Depth;
    uint32_t m_Stride;
    uint32_t m_pColours[16];
};

#endif