1 /*- 2 * Copyright (c) 2007 Bruce M. Simpson. 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 THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include "opt_comconsole.h" 31 32 #include <sys/param.h> 33 #include <sys/kdb.h> 34 #include <sys/kernel.h> 35 #include <sys/priv.h> 36 #include <sys/systm.h> 37 #include <sys/types.h> 38 #include <sys/conf.h> 39 #include <sys/cons.h> 40 #include <sys/consio.h> 41 #include <sys/tty.h> 42 43 #include <dev/cfe/cfe_api.h> 44 #include <dev/cfe/cfe_error.h> 45 46 #include <ddb/ddb.h> 47 48 #ifndef CFECONS_POLL_HZ 49 #define CFECONS_POLL_HZ 4 50 #endif 51 #define CFEBURSTLEN 128 /* max number of bytes to write in one chunk */ 52 53 static tsw_open_t cfe_tty_open; 54 static tsw_close_t cfe_tty_close; 55 static tsw_outwakeup_t cfe_tty_outwakeup; 56 57 static struct ttydevsw cfe_ttydevsw = { 58 .tsw_flags = TF_NOPREFIX, 59 .tsw_open = cfe_tty_open, 60 .tsw_close = cfe_tty_close, 61 .tsw_outwakeup = cfe_tty_outwakeup, 62 }; 63 64 static int conhandle = -1; 65 static struct tty *cfe_tp = NULL; 66 /* XXX does cfe have to poll? */ 67 static int polltime; 68 static struct callout_handle cfe_timeouthandle 69 = CALLOUT_HANDLE_INITIALIZER(&cfe_timeouthandle); 70 71 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 72 static int alt_break_state; 73 #endif 74 75 static void cfe_timeout(void *); 76 77 static cn_probe_t cfe_cnprobe; 78 static cn_init_t cfe_cninit; 79 static cn_term_t cfe_cnterm; 80 static cn_getc_t cfe_cngetc; 81 static cn_putc_t cfe_cnputc; 82 83 CONSOLE_DRIVER(cfe); 84 85 static void 86 cn_drvinit(void *unused) 87 { 88 char output[32]; 89 struct tty *tp; 90 91 if (cfe_consdev.cn_pri != CN_DEAD && 92 cfe_consdev.cn_name[0] != '\0') { 93 tp = tty_alloc(&cfe_ttydevsw, NULL, NULL); 94 tty_makedev(tp, NULL, "%s", output); 95 tty_makealias(tp, "cfecons"); 96 } 97 } 98 99 static int 100 cfe_tty_open(struct tty *tp) 101 { 102 polltime = hz / CFECONS_POLL_HZ; 103 if (polltime < 1) 104 polltime = 1; 105 cfe_timeouthandle = timeout(cfe_timeout, tp, polltime); 106 107 return (0); 108 } 109 110 static void 111 cfe_tty_close(struct tty *tp) 112 { 113 114 /* XXX Should be replaced with callout_stop(9) */ 115 untimeout(cfe_timeout, tp, cfe_timeouthandle); 116 } 117 118 static void 119 cfe_tty_outwakeup(struct tty *tp) 120 { 121 int len; 122 u_char buf[CFEBURSTLEN]; 123 124 for (;;) { 125 len = ttydisc_getc(tp, buf, sizeof buf); 126 if (len == 0) 127 break; 128 while (cfe_write(conhandle, buf, len) == 0) 129 continue; 130 } 131 } 132 133 static void 134 cfe_timeout(void *v) 135 { 136 struct tty *tp; 137 int c; 138 139 tp = (struct tty *)v; 140 141 tty_lock(tp); 142 while ((c = cfe_cngetc(NULL)) != -1) 143 ttydisc_rint(tp, c, 0); 144 ttydisc_rint_done(tp); 145 tty_unlock(tp); 146 147 cfe_timeouthandle = timeout(cfe_timeout, tp, polltime); 148 } 149 150 static void 151 cfe_cnprobe(struct consdev *cp) 152 { 153 154 conhandle = cfe_getstdhandle(CFE_STDHANDLE_CONSOLE); 155 if (conhandle < 0) { 156 cp->cn_pri = CN_DEAD; 157 return; 158 } 159 160 /* XXX */ 161 if (bootverbose) { 162 char *bootmsg = "Using CFE firmware console.\n"; 163 int i; 164 165 for (i = 0; i < strlen(bootmsg); i++) 166 cfe_cnputc(cp, bootmsg[i]); 167 } 168 169 cp->cn_pri = CN_LOW; 170 } 171 172 static void 173 cfe_cninit(struct consdev *cp) 174 { 175 176 strcpy(cp->cn_name, "cfecons"); 177 } 178 179 static void 180 cfe_cnterm(struct consdev *cp) 181 { 182 183 } 184 185 static int 186 cfe_cngetc(struct consdev *cp) 187 { 188 int result; 189 unsigned char ch; 190 191 while ((result = cfe_read(conhandle, &ch, 1)) == 0) 192 continue; 193 194 if (result > 0) { 195 #if defined(KDB) && defined(ALT_BREAK_TO_DEBUGGER) 196 int kdb_brk; 197 198 if ((kdb_brk = kdb_alt_break(ch, &alt_break_state)) != 0) { 199 switch (kdb_brk) { 200 case KDB_REQ_DEBUGGER: 201 kdb_enter(KDB_WHY_BREAK, 202 "Break sequence on console"); 203 break; 204 case KDB_REQ_PANIC: 205 kdb_panic("Panic sequence on console"); 206 break; 207 case KDB_REQ_REBOOT: 208 kdb_reboot(); 209 break; 210 211 } 212 } 213 #endif 214 return (ch); 215 } 216 217 return (-1); 218 } 219 220 static void 221 cfe_cnputc(struct consdev *cp, int c) 222 { 223 char cbuf; 224 225 if (c == '\n') 226 cfe_cnputc(cp, '\r'); 227 228 cbuf = c; 229 while (cfe_write(conhandle, &cbuf, 1) == 0) 230 continue; 231 } 232 233 SYSINIT(cndev, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, cn_drvinit, NULL); 234