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Annotation of Net2/arch/i386/stand/cga.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * William Jolitz.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms, with or without
        !             9:  * modification, are permitted provided that the following conditions
        !            10:  * are met:
        !            11:  * 1. Redistributions of source code must retain the above copyright
        !            12:  *    notice, this list of conditions and the following disclaimer.
        !            13:  * 2. Redistributions in binary form must reproduce the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer in the
        !            15:  *    documentation and/or other materials provided with the distribution.
        !            16:  * 3. All advertising materials mentioning features or use of this software
        !            17:  *    must display the following acknowledgement:
        !            18:  *     This product includes software developed by the University of
        !            19:  *     California, Berkeley and its contributors.
        !            20:  * 4. Neither the name of the University nor the names of its contributors
        !            21:  *    may be used to endorse or promote products derived from this software
        !            22:  *    without specific prior written permission.
        !            23:  *
        !            24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            34:  * SUCH DAMAGE.
        !            35:  *
        !            36:  *     @(#)cga.c       5.3 (Berkeley) 4/28/91
        !            37:  */
        !            38: 
        !            39: #include "param.h"
        !            40: 
        !            41: #define        COL             80
        !            42: #define        ROW             25
        !            43: #define        CHR             2
        !            44: #define MONO_BASE      0x3B4
        !            45: #define MONO_BUF       0xB0000
        !            46: #define CGA_BASE       0x3D4
        !            47: #define CGA_BUF                0xB8000
        !            48: 
        !            49: static u_char  att = 0x7 ;
        !            50: u_char *Crtat = (u_char *)CGA_BUF;
        !            51: 
        !            52: static unsigned int addr_6845 = CGA_BASE;
        !            53: cursor(pos)
        !            54: int pos;
        !            55: {
        !            56:        outb(addr_6845,14);
        !            57:        outb(addr_6845+1,pos >> 8);
        !            58:        outb(addr_6845,15);
        !            59:        outb(addr_6845+1,pos&0xff);
        !            60: }
        !            61: 
        !            62: sput(c)
        !            63: u_char c;
        !            64: {
        !            65: 
        !            66:        static u_char *crtat = 0;
        !            67:        unsigned cursorat; u_short was;
        !            68:        u_char *cp;
        !            69: 
        !            70:        if (crtat == 0) {
        !            71: 
        !            72:                /* XXX probe to find if a color or monochrome display */
        !            73:                was = *(u_short *)Crtat;
        !            74:                *(u_short *)Crtat = 0xA55A;
        !            75:                if (*(u_short *)Crtat != 0xA55A) {
        !            76:                        Crtat = (u_char *) MONO_BUF;
        !            77:                        addr_6845 = MONO_BASE;
        !            78:                }
        !            79:                *(u_short *)Crtat = was;
        !            80: 
        !            81:                /* Extract cursor location */
        !            82:                outb(addr_6845,14);
        !            83:                cursorat = inb(addr_6845+1)<<8 ;
        !            84:                outb(addr_6845,15);
        !            85:                cursorat |= inb(addr_6845+1);
        !            86: 
        !            87:                if(cursorat <= COL*ROW) {
        !            88:                        crtat = Crtat + cursorat*CHR;
        !            89:                        att = crtat[1]; /* use current attribute present */
        !            90:                } else  crtat = Crtat;
        !            91: 
        !            92:                /* clean display */
        !            93:                for (cp = crtat; cp < Crtat+ROW*COL*CHR; cp += 2) {
        !            94:                        cp[0] = ' ';
        !            95:                        cp[1] = att;
        !            96:                }
        !            97:        }
        !            98: 
        !            99:        switch (c) {
        !           100: 
        !           101:        case '\t':
        !           102:                do
        !           103:                        sput(' ');
        !           104:                while ((int)crtat % (8*CHR));
        !           105:                break;
        !           106: 
        !           107:        case '\010':
        !           108:                crtat -= CHR;
        !           109:                break;
        !           110: 
        !           111:        case '\r':
        !           112:                crtat -= (crtat - Crtat) % (COL*CHR);
        !           113:                break;
        !           114: 
        !           115:        case '\n':
        !           116:                crtat += COL*CHR ;
        !           117:                break;
        !           118: 
        !           119:        default:
        !           120:                crtat[0] = c;
        !           121:                crtat[1] = att;
        !           122:                crtat += CHR;
        !           123:                break ;
        !           124:        }
        !           125: 
        !           126: #ifndef SMALL
        !           127:        /* implement a scroll */
        !           128:        if (crtat >= Crtat+COL*ROW*CHR) {
        !           129:                /* move text up */
        !           130:                bcopy(Crtat+COL*CHR, Crtat, COL*(ROW-1)*CHR);
        !           131: 
        !           132:                /* clear line */
        !           133:                for (cp = Crtat+ COL*(ROW-1)*CHR;
        !           134:                        cp < Crtat + COL*ROW*CHR ; cp += 2)
        !           135:                        cp[0] = ' ';
        !           136: 
        !           137:                crtat -= COL*CHR ;
        !           138:        }
        !           139: #endif
        !           140: 
        !           141:        cursor((crtat-Crtat)/CHR);
        !           142: }

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