bvm_console.c revision 221905
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 "opt_comconsole.h" 33 34#include <sys/param.h> 35#include <sys/kernel.h> 36#include <sys/systm.h> 37#include <sys/types.h> 38#include <sys/cons.h> 39#include <sys/tty.h> 40#include <sys/reboot.h> 41#include <sys/bus.h> 42 43#include <sys/kdb.h> 44#include <ddb/ddb.h> 45 46#ifndef BVMCONS_POLL_HZ 47#define BVMCONS_POLL_HZ 4 48#endif 49#define BVMBURSTLEN 16 /* max number of bytes to write in one chunk */ 50 51static tsw_open_t bvm_tty_open; 52static tsw_close_t bvm_tty_close; 53static tsw_outwakeup_t bvm_tty_outwakeup; 54 55static struct ttydevsw bvm_ttydevsw = { 56 .tsw_flags = TF_NOPREFIX, 57 .tsw_open = bvm_tty_open, 58 .tsw_close = bvm_tty_close, 59 .tsw_outwakeup = bvm_tty_outwakeup, 60}; 61 62static int polltime; 63static struct callout_handle bvm_timeouthandle 64 = CALLOUT_HANDLE_INITIALIZER(&bvm_timeouthandle); 65 66#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 67static int alt_break_state; 68#endif 69 70#define BVM_CONS_PORT 0x220 71static int bvm_cons_port = BVM_CONS_PORT; 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; 80 81CONSOLE_DRIVER(bvm); 82 83static int 84bvm_rcons(u_char *ch) 85{ 86 int c; 87 88 c = inl(bvm_cons_port); 89 if (c != -1) { 90 *ch = (u_char)c; 91 return (0); 92 } else 93 return (-1); 94} 95 96static void 97bvm_wcons(u_char ch) 98{ 99 100 outl(bvm_cons_port, ch); 101} 102 103static void 104cn_drvinit(void *unused) 105{ 106 struct tty *tp; 107 108 if (bvm_consdev.cn_pri != CN_DEAD && 109 bvm_consdev.cn_name[0] != '\0') { 110 tp = tty_alloc(&bvm_ttydevsw, NULL); 111 tty_makedev(tp, NULL, "bvmcons"); 112 } 113} 114 115static int 116bvm_tty_open(struct tty *tp) 117{ 118 polltime = hz / BVMCONS_POLL_HZ; 119 if (polltime < 1) 120 polltime = 1; 121 bvm_timeouthandle = timeout(bvm_timeout, tp, polltime); 122 123 return (0); 124} 125 126static void 127bvm_tty_close(struct tty *tp) 128{ 129 130 /* XXX Should be replaced with callout_stop(9) */ 131 untimeout(bvm_timeout, tp, bvm_timeouthandle); 132} 133 134static void 135bvm_tty_outwakeup(struct tty *tp) 136{ 137 int len, written; 138 u_char buf[BVMBURSTLEN]; 139 140 for (;;) { 141 len = ttydisc_getc(tp, buf, sizeof(buf)); 142 if (len == 0) 143 break; 144 145 written = 0; 146 while (written < len) 147 bvm_wcons(buf[written++]); 148 } 149} 150 151static void 152bvm_timeout(void *v) 153{ 154 struct tty *tp; 155 int c; 156 157 tp = (struct tty *)v; 158 159 tty_lock(tp); 160 while ((c = bvm_cngetc(NULL)) != -1) 161 ttydisc_rint(tp, c, 0); 162 ttydisc_rint_done(tp); 163 tty_unlock(tp); 164 165 bvm_timeouthandle = timeout(bvm_timeout, tp, polltime); 166} 167 168static void 169bvm_cnprobe(struct consdev *cp) 170{ 171 int disabled, port; 172 173 disabled = 0; 174 resource_int_value("bvmconsole", 0, "disabled", &disabled); 175 if (disabled) 176 cp->cn_pri = CN_DEAD; 177 else 178 cp->cn_pri = CN_NORMAL; 179 180 if (resource_int_value("bvmconsole", 0, "port", &port) == 0) 181 bvm_cons_port = port; 182} 183 184static void 185bvm_cninit(struct consdev *cp) 186{ 187 int i; 188 const char *bootmsg = "Using bvm console.\n"; 189 190 if (boothowto & RB_VERBOSE) { 191 for (i = 0; i < strlen(bootmsg); i++) 192 bvm_cnputc(cp, bootmsg[i]); 193 } 194 195 strcpy(cp->cn_name, "bvmcons"); 196} 197 198static void 199bvm_cnterm(struct consdev *cp) 200{ 201 202} 203 204static int 205bvm_cngetc(struct consdev *cp) 206{ 207 unsigned char ch; 208 209 if (bvm_rcons(&ch) == 0) { 210#if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 211 int kdb_brk; 212 213 if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) { 214 switch (kdb_brk) { 215 case KDB_REQ_DEBUGGER: 216 kdb_enter(KDB_WHY_BREAK, 217 "Break sequence on console"); 218 break; 219 case KDB_REQ_PANIC: 220 kdb_panic("Panic sequence on console"); 221 break; 222 case KDB_REQ_REBOOT: 223 kdb_reboot(); 224 break; 225 226 } 227 } 228#endif 229 return (ch); 230 } 231 232 return (-1); 233} 234 235static void 236bvm_cnputc(struct consdev *cp, int c) 237{ 238 239 bvm_wcons(c); 240} 241 242SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 243