FreeBSD/Linux Kernel Cross Reference
sys/dev/bvm/bvm_console.c

     /*-
      * Copyright (c) 2011 NetApp, Inc.
      * 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 NETAPP, INC ``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 NETAPP, INC OR CONTRIBUTORS 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.
     *
     * $FreeBSD: releng/10.3/sys/dev/bvm/bvm_console.c 245678 2013-01-20 03:42:49Z neel $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.3/sys/dev/bvm/bvm_console.c 245678 2013-01-20 03:42:49Z neel $");
    
    #include <sys/param.h>
    #include <sys/kernel.h>
    #include <sys/systm.h>
    #include <sys/types.h>
    #include <sys/cons.h>
    #include <sys/tty.h>
    #include <sys/reboot.h>
    #include <sys/bus.h>
    
    #include <sys/kdb.h>
    #include <ddb/ddb.h>
    
    #ifndef BVMCONS_POLL_HZ
    #define BVMCONS_POLL_HZ 4
    #endif
    #define BVMBURSTLEN     16      /* max number of bytes to write in one chunk */
    
    static tsw_open_t bvm_tty_open;
    static tsw_close_t bvm_tty_close;
    static tsw_outwakeup_t bvm_tty_outwakeup;
    
    static struct ttydevsw bvm_ttydevsw = {
            .tsw_flags      = TF_NOPREFIX,
            .tsw_open       = bvm_tty_open,
            .tsw_close      = bvm_tty_close,
            .tsw_outwakeup  = bvm_tty_outwakeup,
    };
    
    static int                      polltime;
    static struct callout_handle    bvm_timeouthandle
        = CALLOUT_HANDLE_INITIALIZER(&bvm_timeouthandle);
    
    #if defined(KDB)
    static int                      alt_break_state;
    #endif
    
    #define BVM_CONS_PORT   0x220
    static int bvm_cons_port = BVM_CONS_PORT;
    
    #define BVM_CONS_SIG    ('b' << 8 | 'v')
    
    static void     bvm_timeout(void *);
    
    static cn_probe_t       bvm_cnprobe;
    static cn_init_t        bvm_cninit;
    static cn_term_t        bvm_cnterm;
    static cn_getc_t        bvm_cngetc;
    static cn_putc_t        bvm_cnputc;
    static cn_grab_t        bvm_cngrab;
    static cn_ungrab_t      bvm_cnungrab;
    
    CONSOLE_DRIVER(bvm);
    
    static int
    bvm_rcons(u_char *ch)
    {
            int c;
    
            c = inl(bvm_cons_port);
            if (c != -1) {
                    *ch = (u_char)c;
                    return (0);
            } else
                    return (-1);
    }
    
    static void
    bvm_wcons(u_char ch)
   {
   
           outl(bvm_cons_port, ch);
   }
   
   static void
   cn_drvinit(void *unused)
   {
           struct tty *tp;
   
           if (bvm_consdev.cn_pri != CN_DEAD &&
               bvm_consdev.cn_name[0] != '\0') {
                   tp = tty_alloc(&bvm_ttydevsw, NULL);
                   tty_makedev(tp, NULL, "bvmcons");
           }
   }
   
   static int
   bvm_tty_open(struct tty *tp)
   {
           polltime = hz / BVMCONS_POLL_HZ;
           if (polltime < 1)
                   polltime = 1;
           bvm_timeouthandle = timeout(bvm_timeout, tp, polltime);
   
           return (0);
   }
   
   static void
   bvm_tty_close(struct tty *tp)
   {
   
           /* XXX Should be replaced with callout_stop(9) */
           untimeout(bvm_timeout, tp, bvm_timeouthandle);
   }
   
   static void
   bvm_tty_outwakeup(struct tty *tp)
   {
           int len, written;
           u_char buf[BVMBURSTLEN];
   
           for (;;) {
                   len = ttydisc_getc(tp, buf, sizeof(buf));
                   if (len == 0)
                           break;
   
                   written = 0;
                   while (written < len)
                           bvm_wcons(buf[written++]);
           }
   }
   
   static void
   bvm_timeout(void *v)
   {
           struct  tty *tp;
           int     c;
   
           tp = (struct tty *)v;
   
           tty_lock(tp);
           while ((c = bvm_cngetc(NULL)) != -1)
                   ttydisc_rint(tp, c, 0);
           ttydisc_rint_done(tp);
           tty_unlock(tp);
   
           bvm_timeouthandle = timeout(bvm_timeout, tp, polltime);
   }
   
   static void
   bvm_cnprobe(struct consdev *cp)
   {
           int disabled, port;
   
           disabled = 0;
           cp->cn_pri = CN_DEAD;
   
           resource_int_value("bvmconsole", 0, "disabled", &disabled);
           if (!disabled) {
                   if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
                           bvm_cons_port = port;
   
                   if (inw(bvm_cons_port) == BVM_CONS_SIG)
                           cp->cn_pri = CN_REMOTE;
           }
   }
   
   static void
   bvm_cninit(struct consdev *cp)
   {
           int i;
           const char *bootmsg = "Using bvm console.\n";
   
           if (boothowto & RB_VERBOSE) {
                   for (i = 0; i < strlen(bootmsg); i++)
                           bvm_cnputc(cp, bootmsg[i]);
           }
   
           strcpy(cp->cn_name, "bvmcons");
   }
   
   static void
   bvm_cnterm(struct consdev *cp)
   {
   
   }
   
   static int
   bvm_cngetc(struct consdev *cp)
   {
           unsigned char ch;
   
           if (bvm_rcons(&ch) == 0) {
   #if defined(KDB)
                   kdb_alt_break(ch, &alt_break_state);
   #endif
                   return (ch);
           }
   
           return (-1);
   }
   
   static void
   bvm_cnputc(struct consdev *cp, int c)
   {
   
           bvm_wcons(c);
   }
   
   static void
   bvm_cngrab(struct consdev *cp)
   {
   }
   
   static void
   bvm_cnungrab(struct consdev *cp)
   {
   }
   
   SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);

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