cfe_console.c

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    1 /*-
    2  * Copyright (c) 2007 Bruce M. Simpson.
    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 THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.0/sys/dev/cfe/cfe_console.c 225214 2011-08-27 14:24:27Z rwatson $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kdb.h>
   32 #include <sys/kernel.h>
   33 #include <sys/priv.h>
   34 #include <sys/systm.h>
   35 #include <sys/types.h>
   36 #include <sys/conf.h>
   37 #include <sys/cons.h>
   38 #include <sys/consio.h>
   39 #include <sys/tty.h>
   40 
   41 #include <dev/cfe/cfe_api.h>
   42 #include <dev/cfe/cfe_error.h>
   43 
   44 #include <ddb/ddb.h>
   45 
   46 #ifndef CFECONS_POLL_HZ
   47 #define CFECONS_POLL_HZ 4
   48 #endif
   49 #define CFEBURSTLEN     128     /* max number of bytes to write in one chunk */
   50 
   51 static tsw_open_t cfe_tty_open;
   52 static tsw_close_t cfe_tty_close;
   53 static tsw_outwakeup_t cfe_tty_outwakeup;
   54 
   55 static struct ttydevsw cfe_ttydevsw = {
   56         .tsw_flags      = TF_NOPREFIX,
   57         .tsw_open       = cfe_tty_open,
   58         .tsw_close      = cfe_tty_close,
   59         .tsw_outwakeup  = cfe_tty_outwakeup,
   60 };
   61 
   62 static int                      conhandle = -1;
   63 /* XXX does cfe have to poll? */
   64 static int                      polltime;
   65 static struct callout_handle    cfe_timeouthandle
   66     = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle);
   67 
   68 #if defined(KDB)
   69 static int                      alt_break_state;
   70 #endif
   71 
   72 static void     cfe_timeout(void *);
   73 
   74 static cn_probe_t       cfe_cnprobe;
   75 static cn_init_t        cfe_cninit;
   76 static cn_term_t        cfe_cnterm;
   77 static cn_getc_t        cfe_cngetc;
   78 static cn_putc_t        cfe_cnputc;
   79 
   80 CONSOLE_DRIVER(cfe);
   81 
   82 static void
   83 cn_drvinit(void *unused)
   84 {
   85         struct tty *tp;
   86 
   87         if (cfe_consdev.cn_pri != CN_DEAD &&
   88             cfe_consdev.cn_name[0] != '\0') {
   89                 tp = tty_alloc(&cfe_ttydevsw, NULL);
   90                 tty_makedev(tp, NULL, "cfecons");
   91         }
   92 }
   93 
   94 static int
   95 cfe_tty_open(struct tty *tp)
   96 {
   97         polltime = hz / CFECONS_POLL_HZ;
   98         if (polltime < 1)
   99                 polltime = 1;
  100         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
  101 
  102         return (0);
  103 }
  104 
  105 static void
  106 cfe_tty_close(struct tty *tp)
  107 {
  108 
  109         /* XXX Should be replaced with callout_stop(9) */
  110         untimeout(cfe_timeout, tp, cfe_timeouthandle);
  111 }
  112 
  113 static void
  114 cfe_tty_outwakeup(struct tty *tp)
  115 {
  116         int len, written, rc;
  117         u_char buf[CFEBURSTLEN];
  118 
  119         for (;;) {
  120                 len = ttydisc_getc(tp, buf, sizeof buf);
  121                 if (len == 0)
  122                         break;
  123 
  124                 written = 0;
  125                 while (written < len) {
  126                         rc = cfe_write(conhandle, &buf[written], len - written);
  127                         if (rc < 0)
  128                                 break;
  129                         written += rc;
  130                 }
  131         }
  132 }
  133 
  134 static void
  135 cfe_timeout(void *v)
  136 {
  137         struct  tty *tp;
  138         int     c;
  139 
  140         tp = (struct tty *)v;
  141 
  142         tty_lock(tp);
  143         while ((c = cfe_cngetc(NULL)) != -1)
  144                 ttydisc_rint(tp, c, 0);
  145         ttydisc_rint_done(tp);
  146         tty_unlock(tp);
  147 
  148         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
  149 }
  150 
  151 static void
  152 cfe_cnprobe(struct consdev *cp)
  153 {
  154 
  155         conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
  156         if (conhandle < 0) {
  157                 cp->cn_pri = CN_DEAD;
  158                 return;
  159         }
  160 
  161         /* XXX */
  162         if (bootverbose) {
  163                 char *bootmsg = "Using CFE firmware console.\n";
  164                 int i;
  165 
  166                 for (i = 0; i < strlen(bootmsg); i++)
  167                         cfe_cnputc(cp, bootmsg[i]);
  168         }
  169 
  170         cp->cn_pri = CN_LOW;
  171 }
  172 
  173 static void
  174 cfe_cninit(struct consdev *cp)
  175 {
  176 
  177         strcpy(cp->cn_name, "cfecons");
  178 }
  179 
  180 static void
  181 cfe_cnterm(struct consdev *cp)
  182 {
  183 
  184 }
  185 
  186 static int
  187 cfe_cngetc(struct consdev *cp)
  188 {
  189         unsigned char ch;
  190 
  191         if (cfe_read(conhandle, &ch, 1) == 1) {
  192 #if defined(KDB)
  193                 kdb_alt_break(ch, &alt_break_state);
  194 #endif
  195                 return (ch);
  196         }
  197 
  198         return (-1);
  199 }
  200 
  201 static void
  202 cfe_cnputc(struct consdev *cp, int c)
  203 {
  204         char cbuf;
  205 
  206         if (c == '\n')
  207                 cfe_cnputc(cp, '\r');
  208 
  209         cbuf = c;
  210         while (cfe_write(conhandle, &cbuf, 1) == 0)
  211                 continue;
  212 }
  213 
  214 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);

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FreeBSD/Linux Kernel Cross Reference sys/dev/cfe/cfe_console.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/cfe/cfe_console.c