/*
 * KON - Kanji ON Linux Console - Copyright (C) 1992, 1993, 1994 Takashi
 * MANABE (manabe@tut.ac.jp)
 * 
 * KON is free software; you can redistribute it and/or modify it under the
 * terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * KON is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 675
 * Mass Ave, Cambridge, MA 02139, USA.
 */

/*
 * This code is based on vgalib.
 * 
 * Thanks to frandsen@diku.dk (Tommy Frandsen).
 */

#include	"big5con.h"

static
void 
SvgaSetStartAddress(void)
{
    int             til;

    til = (dInfo.gydim - 1 - (gramHead / dInfo.glineByte)) << 4;

    PortOutw((gramHead & 0xff00) | 0x0c, vgaCrtAddr);
    PortOutw((gramHead << 8) | 0x0d, vgaCrtAddr);
    PortOutw((til << 4) | 0x18, vgaCrtAddr);
    PortOutw((til & 0x1000) | LineComp8, vgaCrtAddr);
    PortOutw(((til & 0x2000) << 1) | LineComp9, vgaCrtAddr);
}

struct videoInfo SvgaInfo =
{
    TRUE,
    VgaInit,
    VgaTextMode,
    VgaGraphMode,
    VgaWput,
    VgaSput,
    VgaSetCursorAddress,
    VgaSetAddress,
    VgaCursor,
    VgaClearAll,
    VgaScreenSaver,
    VgaDetach,
    SvgaSetStartAddress,
    VgaHardScrollUp,
    VgaHardScrollDown
};

int 
SvgaSetVideoType(struct videoInfo * info, const char *regs)
{
    union videoTimings video;

    *info = SvgaInfo;
    VgaReadNewRegs(regs, &video);
    if (VgaAttach() < 0)
	return FAILURE;
    VgaDefaultCaps();
    return SUCCESS;
}