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Annotation of Gnu-Mach/i386/i386at/immc.c, revision 1.1

1.1     ! root        1: /* 
        !             2:  * Copyright (c) 1995-1994 The University of Utah and
        !             3:  * the Computer Systems Laboratory at the University of Utah (CSL).
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Permission to use, copy, modify and distribute this software is hereby
        !             7:  * granted provided that (1) source code retains these copyright, permission,
        !             8:  * and disclaimer notices, and (2) redistributions including binaries
        !             9:  * reproduce the notices in supporting documentation, and (3) all advertising
        !            10:  * materials mentioning features or use of this software display the following
        !            11:  * acknowledgement: ``This product includes software developed by the
        !            12:  * Computer Systems Laboratory at the University of Utah.''
        !            13:  *
        !            14:  * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
        !            15:  * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
        !            16:  * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  *
        !            18:  * CSL requests users of this software to return to [email protected] any
        !            19:  * improvements that they make and grant CSL redistribution rights.
        !            20:  *
        !            21:  *      Author: Bryan Ford, University of Utah CSL
        !            22:  */
        !            23: 
        !            24: #ifdef ENABLE_IMMEDIATE_CONSOLE
        !            25: 
        !            26: /* This is a special "feature" (read: kludge)
        !            27:    intended for use only for kernel debugging.
        !            28:    It enables an extremely simple console output mechanism
        !            29:    that sends text straight to CGA/EGA/VGA video memory.
        !            30:    It has the nice property of being functional right from the start,
        !            31:    so it can be used to debug things that happen very early
        !            32:    before any devices are initialized.  */
        !            33: 
        !            34: int immediate_console_enable = 1;
        !            35: 
        !            36: void
        !            37: immc_cnputc(unsigned char c)
        !            38: {
        !            39:        static int ofs = -1;
        !            40: 
        !            41:        if (!immediate_console_enable)
        !            42:                return;
        !            43:        if (ofs < 0)
        !            44:        {
        !            45:                ofs = 0;
        !            46:                immc_cnputc('\n');
        !            47:        }
        !            48:        else if (c == '\n')
        !            49:        {
        !            50:                bcopy(0xb8000+80*2, 0xb8000, 80*2*24);
        !            51:                bzero(0xb8000+80*2*24, 80*2);
        !            52:                ofs = 0;
        !            53:        }
        !            54:        else
        !            55:        {
        !            56:                volatile unsigned char *p;
        !            57: 
        !            58:                if (ofs >= 80)
        !            59:                {
        !            60:                        immc_cnputc('\r');
        !            61:                        immc_cnputc('\n');
        !            62:                }
        !            63: 
        !            64:                p = (void*)0xb8000 + 80*2*24 + ofs*2;
        !            65:                p[0] = c;
        !            66:                p[1] = 0x0f;
        !            67:                ofs++;
        !            68:        }
        !            69: }
        !            70: 
        !            71: int immc_cnmaygetc(void)
        !            72: {
        !            73:        return -1;
        !            74: }
        !            75: 
        !            76: #endif ENABLE_IMMEDIATE_CONSOLE
        !            77: 

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