1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 NetApp, Inc. 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 NETAPP, INC ``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 NETAPP, INC 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 * $FreeBSD$ 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD$"); 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 bvm_timer; 64 65#if defined(KDB) 66static int alt_break_state; 67#endif 68 69#define BVM_CONS_PORT 0x220 70static int bvm_cons_port = BVM_CONS_PORT; 71 72#define BVM_CONS_SIG ('b' << 8 | 'v') 73 74static void bvm_timeout(void *); 75 76static cn_probe_t bvm_cnprobe; 77static cn_init_t bvm_cninit; 78static cn_term_t bvm_cnterm; 79static cn_getc_t bvm_cngetc; 80static cn_putc_t bvm_cnputc; 81static cn_grab_t bvm_cngrab; 82static cn_ungrab_t bvm_cnungrab; 83 84CONSOLE_DRIVER(bvm); 85 86static int 87bvm_rcons(u_char *ch) 88{ 89 int c; 90 91 c = inl(bvm_cons_port); 92 if (c != -1) { 93 *ch = (u_char)c; 94 return (0); 95 } else 96 return (-1); 97} 98 99static void 100bvm_wcons(u_char ch) 101{ 102 103 outl(bvm_cons_port, ch); 104} 105 106static void 107cn_drvinit(void *unused) 108{ 109 struct tty *tp; 110 111 gone_in(13, "bvmconsole"); 112 113 if (bvm_consdev.cn_pri != CN_DEAD) { 114 tp = tty_alloc(&bvm_ttydevsw, NULL); 115 callout_init_mtx(&bvm_timer, tty_getlock(tp), 0); 116 tty_makedev(tp, NULL, "bvmcons"); 117 } 118} 119 120static int 121bvm_tty_open(struct tty *tp) 122{ 123 polltime = hz / BVMCONS_POLL_HZ; 124 if (polltime < 1) 125 polltime = 1; 126 callout_reset(&bvm_timer, polltime, bvm_timeout, tp); 127 128 return (0); 129} 130 131static void 132bvm_tty_close(struct tty *tp) 133{ 134 135 tty_assert_locked(tp); 136 callout_stop(&bvm_timer); 137} 138 139static void 140bvm_tty_outwakeup(struct tty *tp) 141{ 142 int len, written; 143 u_char buf[BVMBURSTLEN]; 144 145 for (;;) { 146 len = ttydisc_getc(tp, buf, sizeof(buf)); 147 if (len == 0) 148 break; 149 150 written = 0; 151 while (written < len) 152 bvm_wcons(buf[written++]); 153 } 154} 155 156static void 157bvm_timeout(void *v) 158{ 159 struct tty *tp; 160 int c; 161 162 tp = (struct tty *)v; 163 164 tty_assert_locked(tp); 165 while ((c = bvm_cngetc(NULL)) != -1) 166 ttydisc_rint(tp, c, 0); 167 ttydisc_rint_done(tp); 168 169 callout_reset(&bvm_timer, polltime, bvm_timeout, tp); 170} 171 172static void 173bvm_cnprobe(struct consdev *cp) 174{ 175 int disabled, port; 176 177 disabled = 0; 178 cp->cn_pri = CN_DEAD; 179 strcpy(cp->cn_name, "bvmcons"); 180 181 resource_int_value("bvmconsole", 0, "disabled", &disabled); 182 if (!disabled) { 183 if (resource_int_value("bvmconsole", 0, "port", &port) == 0) 184 bvm_cons_port = port; 185 186 if (inw(bvm_cons_port) == BVM_CONS_SIG) 187 cp->cn_pri = CN_REMOTE; 188 } 189} 190 191static void 192bvm_cninit(struct consdev *cp) 193{ 194 int i; 195 const char *bootmsg = "Using bvm console.\n"; 196 197 if (boothowto & RB_VERBOSE) { 198 for (i = 0; i < strlen(bootmsg); i++) 199 bvm_cnputc(cp, bootmsg[i]); 200 } 201} 202 203static void 204bvm_cnterm(struct consdev *cp) 205{ 206 207} 208 209static int 210bvm_cngetc(struct consdev *cp) 211{ 212 unsigned char ch; 213 214 if (bvm_rcons(&ch) == 0) { 215#if defined(KDB) 216 kdb_alt_break(ch, &alt_break_state); 217#endif 218 return (ch); 219 } 220 221 return (-1); 222} 223 224static void 225bvm_cnputc(struct consdev *cp, int c) 226{ 227 228 bvm_wcons(c); 229} 230 231static void 232bvm_cngrab(struct consdev *cp) 233{ 234} 235 236static void 237bvm_cnungrab(struct consdev *cp) 238{ 239} 240 241SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 242