ofw_console.c

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    1 /*-
    2  * Copyright (C) 2001 Benno Rice.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   18  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   20  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   21  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   22  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   23  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/8.1/sys/dev/ofw/ofw_console.c 193018 2009-05-29 06:41:23Z ed $");
   28 
   29 #include "opt_comconsole.h"
   30 #include "opt_ofw.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/kdb.h>
   34 #include <sys/kernel.h>
   35 #include <sys/priv.h>
   36 #include <sys/systm.h>
   37 #include <sys/types.h>
   38 #include <sys/conf.h>
   39 #include <sys/cons.h>
   40 #include <sys/consio.h>
   41 #include <sys/tty.h>
   42 
   43 #include <dev/ofw/openfirm.h>
   44 
   45 #include <ddb/ddb.h>
   46 
   47 #ifndef OFWCONS_POLL_HZ
   48 #define OFWCONS_POLL_HZ 4       /* 50-100 works best on Ultra2 */
   49 #endif
   50 #define OFBURSTLEN      128     /* max number of bytes to write in one chunk */
   51 
   52 static tsw_open_t ofwtty_open;
   53 static tsw_close_t ofwtty_close;
   54 static tsw_outwakeup_t ofwtty_outwakeup;
   55 
   56 static struct ttydevsw ofw_ttydevsw = {
   57         .tsw_flags      = TF_NOPREFIX,
   58         .tsw_open       = ofwtty_open,
   59         .tsw_close      = ofwtty_close,
   60         .tsw_outwakeup  = ofwtty_outwakeup,
   61 };
   62 
   63 static int                      polltime;
   64 static struct callout_handle    ofw_timeouthandle
   65     = CALLOUT_HANDLE_INITIALIZER(&ofw_timeouthandle);
   66 
   67 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
   68 static int                      alt_break_state;
   69 #endif
   70 
   71 static void     ofw_timeout(void *);
   72 
   73 static cn_probe_t       ofw_cnprobe;
   74 static cn_init_t        ofw_cninit;
   75 static cn_term_t        ofw_cnterm;
   76 static cn_getc_t        ofw_cngetc;
   77 static cn_putc_t        ofw_cnputc;
   78 
   79 CONSOLE_DRIVER(ofw);
   80 
   81 static void
   82 cn_drvinit(void *unused)
   83 {
   84         phandle_t options;
   85         char output[32];
   86         struct tty *tp;
   87 
   88         if (ofw_consdev.cn_pri != CN_DEAD &&
   89             ofw_consdev.cn_name[0] != '\0') {
   90                 if ((options = OF_finddevice("/options")) == -1 ||
   91                     OF_getprop(options, "output-device", output,
   92                     sizeof(output)) == -1)
   93                         return;
   94                 /*
   95                  * XXX: This is a hack and it may result in two /dev/ttya
   96                  * XXX: devices on platforms where the sab driver works.
   97                  */
   98                 tp = tty_alloc(&ofw_ttydevsw, NULL);
   99                 tty_makedev(tp, NULL, "%s", output);
  100                 tty_makealias(tp, "ofwcons");
  101         }
  102 }
  103 
  104 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);
  105 
  106 static int      stdin;
  107 static int      stdout;
  108 
  109 static int
  110 ofwtty_open(struct tty *tp)
  111 {
  112         polltime = hz / OFWCONS_POLL_HZ;
  113         if (polltime < 1)
  114                 polltime = 1;
  115 
  116         ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
  117 
  118         return (0);
  119 }
  120 
  121 static void
  122 ofwtty_close(struct tty *tp)
  123 {
  124 
  125         /* XXX Should be replaced with callout_stop(9) */
  126         untimeout(ofw_timeout, tp, ofw_timeouthandle);
  127 }
  128 
  129 static void
  130 ofwtty_outwakeup(struct tty *tp)
  131 {
  132         int len;
  133         u_char buf[OFBURSTLEN];
  134 
  135         for (;;) {
  136                 len = ttydisc_getc(tp, buf, sizeof buf);
  137                 if (len == 0)
  138                         break;
  139                 OF_write(stdout, buf, len);
  140         }
  141 }
  142 
  143 static void
  144 ofw_timeout(void *v)
  145 {
  146         struct  tty *tp;
  147         int     c;
  148 
  149         tp = (struct tty *)v;
  150 
  151         tty_lock(tp);
  152         while ((c = ofw_cngetc(NULL)) != -1)
  153                 ttydisc_rint(tp, c, 0);
  154         ttydisc_rint_done(tp);
  155         tty_unlock(tp);
  156 
  157         ofw_timeouthandle = timeout(ofw_timeout, tp, polltime);
  158 }
  159 
  160 static void
  161 ofw_cnprobe(struct consdev *cp)
  162 {
  163         int chosen;
  164 
  165         if ((chosen = OF_finddevice("/chosen")) == -1) {
  166                 cp->cn_pri = CN_DEAD;
  167                 return;
  168         }
  169 
  170         if (OF_getprop(chosen, "stdin", &stdin, sizeof(stdin)) == -1) {
  171                 cp->cn_pri = CN_DEAD;
  172                 return;
  173         }
  174 
  175         if (OF_getprop(chosen, "stdout", &stdout, sizeof(stdout)) == -1) {
  176                 cp->cn_pri = CN_DEAD;
  177                 return;
  178         }
  179 
  180         cp->cn_pri = CN_LOW;
  181 }
  182 
  183 static void
  184 ofw_cninit(struct consdev *cp)
  185 {
  186 
  187         /* XXX: This is the alias, but that should be good enough */
  188         strcpy(cp->cn_name, "ofwcons");
  189 }
  190 
  191 static void
  192 ofw_cnterm(struct consdev *cp)
  193 {
  194 }
  195 
  196 static int
  197 ofw_cngetc(struct consdev *cp)
  198 {
  199         unsigned char ch;
  200 
  201         if (OF_read(stdin, &ch, 1) > 0) {
  202 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER)
  203                 int kdb_brk;
  204 
  205                 if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) {
  206                         switch (kdb_brk) {
  207                         case KDB_REQ_DEBUGGER:
  208                                 kdb_enter(KDB_WHY_BREAK,
  209                                     "Break sequence on console");
  210                                 break;
  211                         case KDB_REQ_PANIC:
  212                                 kdb_panic("Panic sequence on console");
  213                                 break;
  214                         case KDB_REQ_REBOOT:
  215                                 kdb_reboot();
  216                                 break;
  217 
  218                         }
  219                 }
  220 #endif
  221                 return (ch);
  222         }
  223 
  224         return (-1);
  225 }
  226 
  227 static void
  228 ofw_cnputc(struct consdev *cp, int c)
  229 {
  230         char cbuf;
  231 
  232         if (c == '\n') {
  233                 cbuf = '\r';
  234                 OF_write(stdout, &cbuf, 1);
  235         }
  236 
  237         cbuf = c;
  238         OF_write(stdout, &cbuf, 1);
  239 }

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

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