bvm_console.c revision 245652
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 49static tsw_open_t bvm_tty_open; 50static tsw_close_t bvm_tty_close; 51static tsw_outwakeup_t bvm_tty_outwakeup; 52 53static 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 60static int polltime; 61static struct callout_handle bvm_timeouthandle 62 = CALLOUT_HANDLE_INITIALIZER(&bvm_timeouthandle); 63 64#if defined(KDB) 65static int alt_break_state; 66#endif 67 68#define BVM_CONS_PORT 0x220 69static int bvm_cons_port = BVM_CONS_PORT; 70 71#define BVM_CONS_SIG ('b' << 8 | 'v') 72 73static void bvm_timeout(void *); 74 75static cn_probe_t bvm_cnprobe; 76static cn_init_t bvm_cninit; 77static cn_term_t bvm_cnterm; 78static cn_getc_t bvm_cngetc; 79static cn_putc_t bvm_cnputc; 80static cn_grab_t bvm_cngrab; 81static cn_ungrab_t bvm_cnungrab; 82 83CONSOLE_DRIVER(bvm); 84 85static int 86bvm_rcons(u_char *ch) 87{ 88 int c; 89 90 c = inl(bvm_cons_port); 91 if (c != -1) { 92 *ch = (u_char)c; 93 return (0); 94 } else 95 return (-1); 96} 97 98static void 99bvm_wcons(u_char ch) 100{ 101 102 outl(bvm_cons_port, ch); 103} 104 105static void 106cn_drvinit(void *unused) 107{ 108 struct tty *tp; 109 110 if (bvm_consdev.cn_pri != CN_DEAD && 111 bvm_consdev.cn_name[0] != '\0') { 112 tp = tty_alloc(&bvm_ttydevsw, NULL); 113 tty_makedev(tp, NULL, "bvmcons"); 114 } 115} 116 117static int 118bvm_tty_open(struct tty *tp) 119{ 120 polltime = hz / BVMCONS_POLL_HZ; 121 if (polltime < 1) 122 polltime = 1; 123 bvm_timeouthandle = timeout(bvm_timeout, tp, polltime); 124 125 return (0); 126} 127 128static void 129bvm_tty_close(struct tty *tp) 130{ 131 132 /* XXX Should be replaced with callout_stop(9) */ 133 untimeout(bvm_timeout, tp, bvm_timeouthandle); 134} 135 136static void 137bvm_tty_outwakeup(struct tty *tp) 138{ 139 int len, written; 140 u_char buf[BVMBURSTLEN]; 141 142 for (;;) { 143 len = ttydisc_getc(tp, buf, sizeof(buf)); 144 if (len == 0) 145 break; 146 147 written = 0; 148 while (written < len) 149 bvm_wcons(buf[written++]); 150 } 151} 152 153static void 154bvm_timeout(void *v) 155{ 156 struct tty *tp; 157 int c; 158 159 tp = (struct tty *)v; 160 161 tty_lock(tp); 162 while ((c = bvm_cngetc(NULL)) != -1) 163 ttydisc_rint(tp, c, 0); 164 ttydisc_rint_done(tp); 165 tty_unlock(tp); 166 167 bvm_timeouthandle = timeout(bvm_timeout, tp, polltime); 168} 169 170static void 171bvm_cnprobe(struct consdev *cp) 172{ 173 int disabled, port; 174 175 disabled = 0; 176 cp->cn_pri = CN_DEAD; 177 178 resource_int_value("bvmconsole", 0, "disabled", &disabled); 179 if (!disabled) { 180 if (resource_int_value("bvmconsole", 0, "port", &port) == 0) 181 bvm_cons_port = port; 182 183 if (inw(bvm_cons_port) == BVM_CONS_SIG) 184 cp->cn_pri = CN_REMOTE; 185 } 186} 187 188static void 189bvm_cninit(struct consdev *cp) 190{ 191 int i; 192 const char *bootmsg = "Using bvm console.\n"; 193 194 if (boothowto & RB_VERBOSE) { 195 for (i = 0; i < strlen(bootmsg); i++) 196 bvm_cnputc(cp, bootmsg[i]); 197 } 198 199 strcpy(cp->cn_name, "bvmcons"); 200} 201 202static void 203bvm_cnterm(struct consdev *cp) 204{ 205 206} 207 208static int 209bvm_cngetc(struct consdev *cp) 210{ 211 unsigned char ch; 212 213 if (bvm_rcons(&ch) == 0) { 214#if defined(KDB) 215 kdb_alt_break(ch, &alt_break_state); 216#endif 217 return (ch); 218 } 219 220 return (-1); 221} 222 223static void 224bvm_cnputc(struct consdev *cp, int c) 225{ 226 227 bvm_wcons(c); 228} 229 230static void 231bvm_cngrab(struct consdev *cp) 232{ 233} 234 235static void 236bvm_cnungrab(struct consdev *cp) 237{ 238} 239 240SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 241