FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/vga_subr.c

     /* $OpenBSD: vga_subr.c,v 1.5 2015/07/18 00:48:05 miod Exp $ */
     /* $NetBSD: vga_subr.c,v 1.6 2000/01/25 02:44:03 ad Exp $ */
     
     /*
      * Copyright (c) 1998
      *      Matthias Drochner.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/device.h>
    #include <sys/queue.h>
    #include <machine/bus.h>
    
    #include <dev/ic/mc6845reg.h>
    #include <dev/ic/pcdisplayvar.h>
    #include <dev/ic/vgareg.h>
    
    #include <dev/wscons/wsdisplayvar.h>
    #include <dev/ic/vgavar.h>
    
    static void fontram(struct vga_handle *);
    static void textram(struct vga_handle *);
    
    static void
    fontram(struct vga_handle *vh)
    {
            /* program sequencer to access character generator */
    
            vga_ts_write(vh, syncreset, 0x01);      /* synchronous reset */
            vga_ts_write(vh, wrplmask, 0x04);       /* write to map 2 */
            vga_ts_write(vh, memmode, 0x07);        /* sequential addressing */
            vga_ts_write(vh, syncreset, 0x03);      /* clear synchronous reset */
    
            /* program graphics controller to access character generator */
    
            vga_gdc_write(vh, rdplanesel, 0x02);    /* select map 2 for cpu reads */
            vga_gdc_write(vh, mode, 0x00);  /* disable odd-even addressing */
            vga_gdc_write(vh, misc, 0x04);  /* map starts at 0xA000 */
    }
    
    static void
    textram(struct vga_handle *vh)
    {
            /* program sequencer to access video ram */
    
            vga_ts_write(vh, syncreset, 0x01);      /* synchronous reset */
            vga_ts_write(vh, wrplmask, 0x03);       /* write to map 0 & 1 */
            vga_ts_write(vh, memmode, 0x03);        /* odd-even addressing */
            vga_ts_write(vh, syncreset, 0x03);      /* clear synchronous reset */
    
            /* program graphics controller for text mode */
    
            vga_gdc_write(vh, rdplanesel, 0x00);    /* select map 0 for cpu reads */
            vga_gdc_write(vh, mode, 0x10);          /* enable odd-even addressing */
            /* map starts at 0xb800 or 0xb000 (mono) */
            vga_gdc_write(vh, misc, (vh->vh_mono ? 0x0a : 0x0e));
    }
    
    void
    vga_loadchars(struct vga_handle *vh, int fontset, int first, int num, int lpc,
        char *data)
    {
            int offset, i, j, s;
    
            /* fontset number swizzle done in vga_setfontset() */
            offset = (fontset << 13) | (first << 5);
    
            s = splhigh();
            fontram(vh);
    
            for (i = 0; i < num; i++)
                    for (j = 0; j < lpc; j++)
                            bus_space_write_1(vh->vh_memt, vh->vh_allmemh,
                                              offset + (i << 5) + j,
                                              data[i * lpc + j]);
    
            textram(vh);
           splx(s);
   }
   
   void
   vga_setfontset(struct vga_handle *vh, int fontset1, int fontset2)
   {
           u_int8_t cmap;
           static const u_int8_t cmaptaba[] = {
                   0x00, 0x10, 0x01, 0x11,
                   0x02, 0x12, 0x03, 0x13
           };
           static const u_int8_t cmaptabb[] = {
                   0x00, 0x20, 0x04, 0x24,
                   0x08, 0x28, 0x0c, 0x2c
           };
   
           /* extended font if fontset1 != fontset2 */
           cmap = cmaptaba[fontset1] | cmaptabb[fontset2];
   
           vga_ts_write(vh, fontsel, cmap);
   }
   
   void
   vga_setscreentype(struct vga_handle *vh, const struct wsscreen_descr *type)
   {
           vga_6845_write(vh, maxrow, type->fontheight - 1);
   
           /* lo byte */
           vga_6845_write(vh, vde, type->fontheight * type->nrows - 1);
   
   #ifndef PCDISPLAY_SOFTCURSOR
           /* set cursor to last 2 lines */
           vga_6845_write(vh, curstart, type->fontheight - 2);
           vga_6845_write(vh, curend, type->fontheight - 1);
   #endif
           /*
            * disable colour plane 3 if needed for font selection
            */
           if (type->capabilities & WSSCREEN_HILIT) {
                   /*
                    * these are the screens which don't support
                    * 512-character fonts
                    */
                   vga_attr_write(vh, colplen, 0x0f);
           } else
                   vga_attr_write(vh, colplen, 0x07);
   }

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