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/10.3/sys/dev/cfe/cfe_console.c 228631 2011-12-17 15:08:43Z avg $");
   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 static cn_grab_t        cfe_cngrab;
   80 static cn_ungrab_t      cfe_cnungrab;
   81 
   82 CONSOLE_DRIVER(cfe);
   83 
   84 static void
   85 cn_drvinit(void *unused)
   86 {
   87         struct tty *tp;
   88 
   89         if (cfe_consdev.cn_pri != CN_DEAD &&
   90             cfe_consdev.cn_name[0] != '\0') {
   91                 tp = tty_alloc(&cfe_ttydevsw, NULL);
   92                 tty_makedev(tp, NULL, "cfecons");
   93         }
   94 }
   95 
   96 static int
   97 cfe_tty_open(struct tty *tp)
   98 {
   99         polltime = hz / CFECONS_POLL_HZ;
  100         if (polltime < 1)
  101                 polltime = 1;
  102         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
  103 
  104         return (0);
  105 }
  106 
  107 static void
  108 cfe_tty_close(struct tty *tp)
  109 {
  110 
  111         /* XXX Should be replaced with callout_stop(9) */
  112         untimeout(cfe_timeout, tp, cfe_timeouthandle);
  113 }
  114 
  115 static void
  116 cfe_tty_outwakeup(struct tty *tp)
  117 {
  118         int len, written, rc;
  119         u_char buf[CFEBURSTLEN];
  120 
  121         for (;;) {
  122                 len = ttydisc_getc(tp, buf, sizeof buf);
  123                 if (len == 0)
  124                         break;
  125 
  126                 written = 0;
  127                 while (written < len) {
  128                         rc = cfe_write(conhandle, &buf[written], len - written);
  129                         if (rc < 0)
  130                                 break;
  131                         written += rc;
  132                 }
  133         }
  134 }
  135 
  136 static void
  137 cfe_timeout(void *v)
  138 {
  139         struct  tty *tp;
  140         int     c;
  141 
  142         tp = (struct tty *)v;
  143 
  144         tty_lock(tp);
  145         while ((c = cfe_cngetc(NULL)) != -1)
  146                 ttydisc_rint(tp, c, 0);
  147         ttydisc_rint_done(tp);
  148         tty_unlock(tp);
  149 
  150         cfe_timeouthandle = timeout(cfe_timeout, tp, polltime);
  151 }
  152 
  153 static void
  154 cfe_cnprobe(struct consdev *cp)
  155 {
  156 
  157         conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE);
  158         if (conhandle < 0) {
  159                 cp->cn_pri = CN_DEAD;
  160                 return;
  161         }
  162 
  163         /* XXX */
  164         if (bootverbose) {
  165                 char *bootmsg = "Using CFE firmware console.\n";
  166                 int i;
  167 
  168                 for (i = 0; i < strlen(bootmsg); i++)
  169                         cfe_cnputc(cp, bootmsg[i]);
  170         }
  171 
  172         cp->cn_pri = CN_LOW;
  173 }
  174 
  175 static void
  176 cfe_cninit(struct consdev *cp)
  177 {
  178 
  179         strcpy(cp->cn_name, "cfecons");
  180 }
  181 
  182 static void
  183 cfe_cnterm(struct consdev *cp)
  184 {
  185 
  186 }
  187 
  188 static void
  189 cfe_cngrab(struct consdev *cp)
  190 {
  191 
  192 }
  193 
  194 static void
  195 cfe_cnungrab(struct consdev *cp)
  196 {
  197 
  198 }
  199 
  200 static int
  201 cfe_cngetc(struct consdev *cp)
  202 {
  203         unsigned char ch;
  204 
  205         if (cfe_read(conhandle, &ch, 1) == 1) {
  206 #if defined(KDB)
  207                 kdb_alt_break(ch, &alt_break_state);
  208 #endif
  209                 return (ch);
  210         }
  211 
  212         return (-1);
  213 }
  214 
  215 static void
  216 cfe_cnputc(struct consdev *cp, int c)
  217 {
  218         char cbuf;
  219 
  220         if (c == '\n')
  221                 cfe_cnputc(cp, '\r');
  222 
  223         cbuf = c;
  224         while (cfe_write(conhandle, &cbuf, 1) == 0)
  225                 continue;
  226 }
  227 
  228 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