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Annotation of Gnu-Mach/i386/i386at/immc.c, revision 1.1.1.5

1.1.1.2   root        1: /*
1.1       root        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: 
1.1.1.5 ! root       24: #if    ENABLE_IMMEDIATE_CONSOLE
1.1       root       25: 
1.1.1.5 ! root       26: #include <device/cons.h>
        !            27: #include <mach/boolean.h>
        !            28: #include <i386/vm_param.h>
1.1.1.3   root       29: #include <string.h>
                     30: 
1.1       root       31: /* This is a special "feature" (read: kludge)
                     32:    intended for use only for kernel debugging.
                     33:    It enables an extremely simple console output mechanism
                     34:    that sends text straight to CGA/EGA/VGA video memory.
                     35:    It has the nice property of being functional right from the start,
                     36:    so it can be used to debug things that happen very early
                     37:    before any devices are initialized.  */
                     38: 
1.1.1.4   root       39: boolean_t immediate_console_enable = TRUE;
1.1       root       40: 
1.1.1.5 ! root       41: /*
        !            42:  * XXX we assume that pcs *always* have a console
        !            43:  */
        !            44: int
        !            45: immc_cnprobe(struct consdev *cp)
        !            46: {
        !            47:        int maj, unit, pri;
        !            48: 
        !            49:        maj = 0;
        !            50:        unit = 0;
        !            51:        pri = CN_INTERNAL;
        !            52: 
        !            53:        cp->cn_dev = makedev(maj, unit);
        !            54:        cp->cn_pri = pri;
        !            55:        return 0;
        !            56: }
        !            57: 
        !            58: int
        !            59: immc_cninit(struct consdev *cp)
        !            60: {
        !            61:        return 0;
        !            62: }
        !            63: 
        !            64: int immc_cnmaygetc(void)
        !            65: {
        !            66:        return -1;
        !            67: }
        !            68: 
        !            69: int
        !            70: immc_cngetc(dev_t dev, int wait)
        !            71: {
        !            72:        if (wait) {
        !            73:                int c;
        !            74:                while ((c = immc_cnmaygetc()) < 0)
        !            75:                        continue;
        !            76:                return c;
        !            77:        }
        !            78:        else
        !            79:                return immc_cnmaygetc();
        !            80: }
        !            81: 
        !            82: int
        !            83: immc_cnputc(dev_t dev, int c)
1.1       root       84: {
                     85:        static int ofs = -1;
                     86: 
                     87:        if (!immediate_console_enable)
1.1.1.5 ! root       88:                return -1;
        !            89:        if (ofs < 0 || ofs >= 80)
1.1       root       90:        {
                     91:                ofs = 0;
1.1.1.5 ! root       92:                immc_cnputc(dev, '\n');
1.1       root       93:        }
1.1.1.5 ! root       94: 
        !            95:        if (c == '\n')
1.1       root       96:        {
1.1.1.5 ! root       97:                memmove((void *) phystokv(0xb8000),
        !            98:                        (void *) phystokv(0xb8000+80*2), 80*2*24);
        !            99:                memset((void *) phystokv((0xb8000+80*2*24)), 0, 80*2);
1.1       root      100:                ofs = 0;
                    101:        }
                    102:        else
                    103:        {
                    104:                volatile unsigned char *p;
                    105: 
                    106:                if (ofs >= 80)
                    107:                {
1.1.1.5 ! root      108:                        immc_cnputc(dev, '\r');
        !           109:                        immc_cnputc(dev, '\n');
1.1       root      110:                }
                    111: 
1.1.1.5 ! root      112:                p = (void *) phystokv(0xb8000 + 80*2*24 + ofs*2);
1.1       root      113:                p[0] = c;
                    114:                p[1] = 0x0f;
                    115:                ofs++;
                    116:        }
1.1.1.5 ! root      117:        return 0;
1.1       root      118: }
                    119: 
1.1.1.5 ! root      120: void
        !           121: immc_romputc(char c)
1.1       root      122: {
1.1.1.5 ! root      123:        immc_cnputc (0, c);
1.1       root      124: }
                    125: 
1.1.1.2   root      126: #endif /* ENABLE_IMMEDIATE_CONSOLE */

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