cfe_console.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2007 Bruce M. Simpson.
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   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/cfe/cfe_api.h>
   44 #include <dev/cfe/cfe_error.h>
   45 
   46 #include <ddb/ddb.h>
   47 
   48 #ifndef CFECONS_POLL_HZ
   49 #define CFECONS_POLL_HZ 4
   50 #endif
   51 #define CFEBURSTLEN     128     /* max number of bytes to write in one chunk */
   52 
   53 static tsw_open_t cfe_tty_open;
   54 static tsw_close_t cfe_tty_close;
   55 static tsw_outwakeup_t cfe_tty_outwakeup;
   56 
   57 static struct ttydevsw cfe_ttydevsw = {
   58         .tsw_flags      = TF_NOPREFIX,
   59         .tsw_open       = cfe_tty_open,
   60         .tsw_close      = cfe_tty_close,
   61         .tsw_outwakeup  = cfe_tty_outwakeup,
   62 };
   63 
   64 static int                      conhandle = -1;
   65 /* XXX does cfe have to poll? */
   66 static int                      polltime;
   67 static struct callout           cfe_timer;
   68 
   69 #if defined(KDB)
   70 static int                      alt_break_state;
   71 #endif
   72 
   73 static void     cfe_timeout(void *);
   74 
   75 static cn_probe_t       cfe_cnprobe;
   76 static cn_init_t        cfe_cninit;
   77 static cn_term_t        cfe_cnterm;
   78 static cn_getc_t        cfe_cngetc;
   79 static cn_putc_t        cfe_cnputc;
   80 static cn_grab_t        cfe_cngrab;
   81 static cn_ungrab_t      cfe_cnungrab;
   82 
   83 CONSOLE_DRIVER(cfe);
   84 
   85 static void
   86 cn_drvinit(void *unused)
   87 {
   88         struct tty *tp;
   89 
   90         if (cfe_consdev.cn_pri != CN_DEAD &&
   91             cfe_consdev.cn_name[0] != '\0') {
   92                 tp = tty_alloc(&cfe_ttydevsw, NULL);
   93                 callout_init_mtx(&cfe_timer, tty_getlock(tp), 0);
   94                 tty_makedev(tp, NULL, "cfecons");
   95         }
   96 }
   97 
   98 static int
   99 cfe_tty_open(struct tty *tp)
  100 {
  101         polltime = hz / CFECONS_POLL_HZ;
  102         if (polltime < 1)
  103                 polltime = 1;
  104         callout_reset(&cfe_timer, polltime, cfe_timeout, tp);
  105 
  106         return (0);
  107 }
  108 
  109 static void
  110 cfe_tty_close(struct tty *tp)
  111 {
  112 
  113         callout_stop(&cfe_timer);
  114 }
  115 
  116 static void
  117 cfe_tty_outwakeup(struct tty *tp)
  118 {
  119         int len, written, rc;
  120         u_char buf[CFEBURSTLEN];
  121 
  122         for (;;) {
  123                 len = ttydisc_getc(tp, buf, sizeof buf);
  124                 if (len == 0)
  125                         break;
  126 
  127                 written = 0;
  128                 while (written < len) {
  129                         rc = cfe_write(conhandle, &buf[written], len - written);
  130                         if (rc < 0)
  131                                 break;
  132                         written += rc;
  133                 }
  134         }
  135 }
  136 
  137 static void
  138 cfe_timeout(void *v)
  139 {
  140         struct  tty *tp;
  141         int     c;
  142 
  143         tp = (struct tty *)v;
  144 
  145         tty_assert_locked(tp);
  146         while ((c = cfe_cngetc(NULL)) != -1)
  147                 ttydisc_rint(tp, c, 0);
  148         ttydisc_rint_done(tp);
  149 
  150         callout_reset(&cfe_timer, polltime, cfe_timeout, tp);
  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