FreeBSD/Linux Kernel Cross Reference
sys/dev/ofw/ofw_console.c

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (C) 2001 Benno Rice.
      * 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 Benno Rice ``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 TOOLS GMBH 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/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_ofw.h"
    
    #include <sys/param.h>
    #include <sys/kdb.h>
    #include <sys/kernel.h>
    #include <sys/priv.h>
    #include <sys/systm.h>
    #include <sys/types.h>
    #include <sys/conf.h>
    #include <sys/cons.h>
    #include <sys/consio.h>
    #include <sys/tty.h>
    
    #include <dev/ofw/openfirm.h>
    
    #include <ddb/ddb.h>
    
    #ifndef OFWCONS_POLL_HZ
    #define OFWCONS_POLL_HZ 4       /* 50-100 works best on Ultra2 */
    #endif
    #define OFBURSTLEN      128     /* max number of bytes to write in one chunk */
    
    static tsw_open_t ofwtty_open;
    static tsw_close_t ofwtty_close;
    static tsw_outwakeup_t ofwtty_outwakeup;
    
    static struct ttydevsw ofw_ttydevsw = {
            .tsw_flags      = TF_NOPREFIX,
            .tsw_open       = ofwtty_open,
            .tsw_close      = ofwtty_close,
            .tsw_outwakeup  = ofwtty_outwakeup,
    };
    
    static int                      polltime;
    static struct callout           ofw_timer;
    
    #if defined(KDB)
    static int                      alt_break_state;
    #endif
    
    static void     ofw_timeout(void *);
    
    static cn_probe_t       ofw_cnprobe;
    static cn_init_t        ofw_cninit;
    static cn_term_t        ofw_cnterm;
    static cn_getc_t        ofw_cngetc;
    static cn_putc_t        ofw_cnputc;
    static cn_grab_t        ofw_cngrab;
    static cn_ungrab_t      ofw_cnungrab;
    
    CONSOLE_DRIVER(ofw);
    
    static void
    cn_drvinit(void *unused)
    {
            phandle_t options;
            char output[32];
            struct tty *tp;
    
            if (ofw_consdev.cn_pri != CN_DEAD &&
                ofw_consdev.cn_name[0] != '\0') {
                    tp = tty_alloc(&ofw_ttydevsw, NULL);
                    tty_makedev(tp, NULL, "%s", "ofwcons");
    
                    /*
                     * XXX: This is a hack and it may result in two /dev/ttya
                     * XXX: devices on platforms where the sab driver works.
                     */
                    if ((options = OF_finddevice("/options")) == -1 ||
                       OF_getprop(options, "output-device", output,
                       sizeof(output)) == -1)
                           return;
                   if (strlen(output) > 0)
                           tty_makealias(tp, "%s", output);
                   callout_init_mtx(&ofw_timer, tty_getlock(tp), 0);
           }
   }
   
   SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
   
   static pcell_t  stdin;
   static pcell_t  stdout;
   
   static int
   ofwtty_open(struct tty *tp)
   {
           polltime = hz / OFWCONS_POLL_HZ;
           if (polltime < 1)
                   polltime = 1;
   
           callout_reset(&ofw_timer, polltime, ofw_timeout, tp);
   
           return (0);
   }
   
   static void
   ofwtty_close(struct tty *tp)
   {
   
           callout_stop(&ofw_timer);
   }
   
   static void
   ofwtty_outwakeup(struct tty *tp)
   {
           int len;
           u_char buf[OFBURSTLEN];
   
           for (;;) {
                   len = ttydisc_getc(tp, buf, sizeof buf);
                   if (len == 0)
                           break;
                   OF_write(stdout, buf, len);
           }
   }
   
   static void
   ofw_timeout(void *v)
   {
           struct  tty *tp;
           int     c;
   
           tp = (struct tty *)v;
   
           tty_assert_locked(tp);
           while ((c = ofw_cngetc(NULL)) != -1)
                   ttydisc_rint(tp, c, 0);
           ttydisc_rint_done(tp);
   
           callout_schedule(&ofw_timer, polltime);
   }
   
   static void
   ofw_cnprobe(struct consdev *cp)
   {
           int chosen;
   
           if ((chosen = OF_finddevice("/chosen")) == -1) {
                   cp->cn_pri = CN_DEAD;
                   return;
           }
   
           if (OF_getencprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) {
                   cp->cn_pri = CN_DEAD;
                   return;
           }
   
           if (OF_getencprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) {
                   cp->cn_pri = CN_DEAD;
                   return;
           }
   
           cp->cn_pri = CN_LOW;
   }
   
   static void
   ofw_cninit(struct consdev *cp)
   {
   
           /* XXX: This is the alias, but that should be good enough */
           strcpy(cp->cn_name, "ofwcons");
   }
   
   static void
   ofw_cnterm(struct consdev *cp)
   {
   }
   
   static void
   ofw_cngrab(struct consdev *cp)
   {
   }
   
   static void
   ofw_cnungrab(struct consdev *cp)
   {
   }
   
   static int
   ofw_cngetc(struct consdev *cp)
   {
           unsigned char ch;
   
           if (OF_read(stdin, &ch, 1) > 0) {
   #if defined(KDB)
                   kdb_alt_break(ch, &alt_break_state);
   #endif
                   return (ch);
           }
   
           return (-1);
   }
   
   static void
   ofw_cnputc(struct consdev *cp, int c)
   {
           char cbuf;
   
           if (c == '\n') {
                   cbuf = '\r';
                   OF_write(stdout, &cbuf, 1);
           }
   
           cbuf = c;
           OF_write(stdout, &cbuf, 1);
   }

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