sys/dev/bvm/bvm_console.c

   1 /*-
   2  * Copyright (c) 2011 NetApp, Inc.
   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 NETAPP, INC ``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 NETAPP, INC 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  * $FreeBSD$
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/kernel.h>
  34 #include <sys/systm.h>
  35 #include <sys/types.h>
  36 #include <sys/cons.h>
  37 #include <sys/tty.h>
  38 #include <sys/reboot.h>
  39 #include <sys/bus.h>
  40
  41 #include <sys/kdb.h>
  42 #include <ddb/ddb.h>
  43
  44 #ifndef BVMCONS_POLL_HZ
  45 #define BVMCONS_POLL_HZ 4
  46 #endif
  47 #define BVMBURSTLEN     16      /* max number of bytes to write in one chunk */
  48
  49 static tsw_open_t bvm_tty_open;
  50 static tsw_close_t bvm_tty_close;
  51 static tsw_outwakeup_t bvm_tty_outwakeup;
  52
  53 static struct ttydevsw bvm_ttydevsw = {
  54         .tsw_flags      = TF_NOPREFIX,
  55         .tsw_open       = bvm_tty_open,
  56         .tsw_close      = bvm_tty_close,
  57         .tsw_outwakeup  = bvm_tty_outwakeup,
  58 };
  59
  60 static int                      polltime;
  61 static struct callout           bvm_timer;
  62
  63 #if defined(KDB)
  64 static int                      alt_break_state;
  65 #endif
  66
  67 #define BVM_CONS_PORT   0x220
  68 static int bvm_cons_port = BVM_CONS_PORT;
  69
  70 #define BVM_CONS_SIG    ('b' << 8 | 'v')
  71
  72 static void     bvm_timeout(void *);
  73
  74 static cn_probe_t       bvm_cnprobe;
  75 static cn_init_t        bvm_cninit;
  76 static cn_term_t        bvm_cnterm;
  77 static cn_getc_t        bvm_cngetc;
  78 static cn_putc_t        bvm_cnputc;
  79 static cn_grab_t        bvm_cngrab;
  80 static cn_ungrab_t      bvm_cnungrab;
  81
  82 CONSOLE_DRIVER(bvm);
  83
  84 static int
  85 bvm_rcons(u_char *ch)
  86 {
  87         int c;
  88
  89         c = inl(bvm_cons_port);
  90         if (c != -1) {
  91                 *ch = (u_char)c;
  92                 return (0);
  93         } else
  94                 return (-1);
  95 }
  96
  97 static void
  98 bvm_wcons(u_char ch)
  99 {
 100
 101         outl(bvm_cons_port, ch);
 102 }
 103
 104 static void
 105 cn_drvinit(void *unused)
 106 {
 107         struct tty *tp;
 108
 109         if (bvm_consdev.cn_pri != CN_DEAD) {
 110                 tp = tty_alloc(&bvm_ttydevsw, NULL);
 111                 callout_init_mtx(&bvm_timer, tty_getlock(tp), 0);
 112                 tty_makedev(tp, NULL, "bvmcons");
 113         }
 114 }
 115
 116 static int
 117 bvm_tty_open(struct tty *tp)
 118 {
 119         polltime = hz / BVMCONS_POLL_HZ;
 120         if (polltime < 1)
 121                 polltime = 1;
 122         callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
 123
 124         return (0);
 125 }
 126
 127 static void
 128 bvm_tty_close(struct tty *tp)
 129 {
 130
 131         tty_lock_assert(tp, MA_OWNED);
 132         callout_stop(&bvm_timer);
 133 }
 134
 135 static void
 136 bvm_tty_outwakeup(struct tty *tp)
 137 {
 138         int len, written;
 139         u_char buf[BVMBURSTLEN];
 140
 141         for (;;) {
 142                 len = ttydisc_getc(tp, buf, sizeof(buf));
 143                 if (len == 0)
 144                         break;
 145
 146                 written = 0;
 147                 while (written < len)
 148                         bvm_wcons(buf[written++]);
 149         }
 150 }
 151
 152 static void
 153 bvm_timeout(void *v)
 154 {
 155         struct  tty *tp;
 156         int     c;
 157
 158         tp = (struct tty *)v;
 159
 160         tty_lock_assert(tp, MA_OWNED);
 161         while ((c = bvm_cngetc(NULL)) != -1)
 162                 ttydisc_rint(tp, c, 0);
 163         ttydisc_rint_done(tp);
 164
 165         callout_reset(&bvm_timer, polltime, bvm_timeout, tp);
 166 }
 167
 168 static void
 169 bvm_cnprobe(struct consdev *cp)
 170 {
 171         int disabled, port;
 172
 173         disabled = 0;
 174         cp->cn_pri = CN_DEAD;
 175         strcpy(cp->cn_name, "bvmcons");
 176
 177         resource_int_value("bvmconsole", 0, "disabled", &disabled);
 178         if (!disabled) {
 179                 if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
 180                         bvm_cons_port = port;
 181
 182                 if (inw(bvm_cons_port) == BVM_CONS_SIG)
 183                         cp->cn_pri = CN_REMOTE;
 184         }
 185 }
 186
 187 static void
 188 bvm_cninit(struct consdev *cp)
 189 {
 190         int i;
 191         const char *bootmsg = "Using bvm console.\n";
 192
 193         if (boothowto & RB_VERBOSE) {
 194                 for (i = 0; i < strlen(bootmsg); i++)
 195                         bvm_cnputc(cp, bootmsg[i]);
 196         }
 197 }
 198
 199 static void
 200 bvm_cnterm(struct consdev *cp)
 201 {
 202
 203 }
 204
 205 static int
 206 bvm_cngetc(struct consdev *cp)
 207 {
 208         unsigned char ch;
 209
 210         if (bvm_rcons(&ch) == 0) {
 211 #if defined(KDB)
 212                 kdb_alt_break(ch, &alt_break_state);
 213 #endif
 214                 return (ch);
 215         }
 216
 217         return (-1);
 218 }
 219
 220 static void
 221 bvm_cnputc(struct consdev *cp, int c)
 222 {
 223
 224         bvm_wcons(c);
 225 }
 226
 227 static void
 228 bvm_cngrab(struct consdev *cp)
 229 {
 230 }
 231
 232 static void
 233 bvm_cnungrab(struct consdev *cp)
 234 {
 235 }
 236
 237 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL);