2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (C) 2003,2004
5 * Hidetoshi Shimokawa. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
18 * This product includes software developed by Hidetoshi Shimokawa.
20 * 4. Neither the name of the author nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #include <sys/param.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
44 #include <sys/systm.h>
45 #include <sys/types.h>
48 #include <sys/consio.h>
50 #include <sys/malloc.h>
53 #include <sys/ucred.h>
55 #include <machine/bus.h>
57 #include <dev/dcons/dcons.h>
58 #include <dev/dcons/dcons_os.h>
61 #include <sys/reboot.h>
63 #include <sys/sysctl.h>
66 #include <vm/vm_param.h>
69 #include "opt_dcons.h"
76 #define DCONS_POLL_HZ 25
79 #ifndef DCONS_POLL_IDLE
80 #define DCONS_POLL_IDLE 256
83 #ifndef DCONS_BUF_SIZE
84 #define DCONS_BUF_SIZE (16*1024)
87 #ifndef DCONS_FORCE_CONSOLE
88 #define DCONS_FORCE_CONSOLE 0 /* Mostly for FreeBSD-4/DragonFly */
92 static char bssbuf[DCONS_BUF_SIZE]; /* buf in bss */
96 static struct dcons_global dg;
97 struct dcons_global *dcons_conf;
98 static int poll_hz = DCONS_POLL_HZ;
99 static u_int poll_idle = DCONS_POLL_HZ * DCONS_POLL_IDLE;
101 static struct dcons_softc sc[DCONS_NPORT];
103 static SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
104 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
105 "dcons polling rate");
107 static int drv_init = 0;
108 static struct callout dcons_callout;
109 struct dcons_buf *dcons_buf; /* for local dconschat */
111 static void dcons_timeout(void *);
112 static int dcons_drv_init(int);
114 static cn_probe_t dcons_cnprobe;
115 static cn_init_t dcons_cninit;
116 static cn_term_t dcons_cnterm;
117 static cn_getc_t dcons_cngetc;
118 static cn_putc_t dcons_cnputc;
119 static cn_grab_t dcons_cngrab;
120 static cn_ungrab_t dcons_cnungrab;
122 CONSOLE_DRIVER(dcons);
125 static gdb_probe_f dcons_dbg_probe;
126 static gdb_init_f dcons_dbg_init;
127 static gdb_term_f dcons_dbg_term;
128 static gdb_getc_f dcons_dbg_getc;
129 static gdb_putc_f dcons_dbg_putc;
131 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term,
132 dcons_dbg_getc, dcons_dbg_putc);
134 extern struct gdb_dbgport *gdb_cur;
137 static tsw_outwakeup_t dcons_outwakeup;
139 static struct ttydevsw dcons_ttydevsw = {
140 .tsw_flags = TF_NOPREFIX,
141 .tsw_outwakeup = dcons_outwakeup,
144 #if (defined(GDB) || defined(DDB))
146 dcons_check_break(struct dcons_softc *dc, int c)
153 if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport)
154 kdb_alt_break_gdb(c, &dc->brk_state);
157 kdb_alt_break(c, &dc->brk_state);
162 #define dcons_check_break(dc, c) (c)
166 dcons_os_checkc_nopoll(struct dcons_softc *dc)
170 if (dg.dma_tag != NULL)
171 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
173 c = dcons_check_break(dc, dcons_checkc(dc));
175 if (dg.dma_tag != NULL)
176 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD);
182 dcons_os_checkc(struct dcons_softc *dc)
184 EVENTHANDLER_INVOKE(dcons_poll, 0);
185 return (dcons_os_checkc_nopoll(dc));
189 dcons_os_putc(struct dcons_softc *dc, int c)
191 if (dg.dma_tag != NULL)
192 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE);
196 if (dg.dma_tag != NULL)
197 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
201 dcons_outwakeup(struct tty *tp)
203 struct dcons_softc *dc;
208 while (ttydisc_getc(tp, &ch, sizeof ch) != 0)
209 dcons_os_putc(dc, ch);
213 dcons_timeout(void *v)
216 struct dcons_softc *dc;
219 for (i = 0; i < DCONS_NPORT; i ++) {
224 while ((c = dcons_os_checkc_nopoll(dc)) != -1) {
225 ttydisc_rint(tp, c, 0);
228 ttydisc_rint_done(tp);
233 if (poll_idle <= (poll_hz * DCONS_POLL_IDLE))
235 callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
239 dcons_cnprobe(struct consdev *cp)
241 sprintf(cp->cn_name, "dcons");
242 #if DCONS_FORCE_CONSOLE
243 cp->cn_pri = CN_REMOTE;
245 cp->cn_pri = CN_NORMAL;
250 dcons_cninit(struct consdev *cp)
253 cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
257 dcons_cnterm(struct consdev *cp)
262 dcons_cngrab(struct consdev *cp)
267 dcons_cnungrab(struct consdev *cp)
272 dcons_cngetc(struct consdev *cp)
274 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
275 return (dcons_os_checkc(dc));
279 dcons_cnputc(struct consdev *cp, int c)
281 struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
282 dcons_os_putc(dc, c);
286 dcons_drv_init(int stage)
288 #if defined(__i386__) || defined(__amd64__)
297 bzero(&dg, sizeof(dg));
299 dg.cdev = &dcons_consdev;
301 dg.size = DCONS_BUF_SIZE;
303 #if defined(__i386__) || defined(__amd64__)
304 if (getenv_quad("dcons.addr", &addr) > 0 &&
305 getenv_quad("dcons.size", &size) > 0) {
309 * Allow read/write access to dcons buffer.
311 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE)
312 *vtopte(PMAP_MAP_LOW + pa) |= PG_RW;
317 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr);
319 dg.buf = (struct dcons_buf *)((vm_offset_t)PMAP_MAP_LOW +
323 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0)
331 if (stage == 0) { /* XXX or cold */
333 * DCONS_FORCE_CONSOLE == 1 and statically linked.
334 * called from cninit(). can't use contigmalloc yet .
336 dg.buf = (struct dcons_buf *) bssbuf;
337 dcons_init(dg.buf, dg.size, sc);
342 * DCONS_FORCE_CONSOLE == 0 or kernel module case.
343 * if the module is loaded after boot,
344 * bssbuf could be non-continuous.
346 dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
347 M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
350 dcons_init(dg.buf, dg.size, sc);
363 dcons_attach_port(int port, char *name, int flags)
365 struct dcons_softc *dc;
369 tp = tty_alloc(&dcons_ttydevsw, dc);
372 tty_init_console(tp, 0);
373 tty_makedev(tp, NULL, "%s", name);
382 dcons_attach_port(DCONS_CON, "dcons", 0);
383 dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
384 callout_init(&dcons_callout, 1);
385 polltime = hz / poll_hz;
386 callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
391 dcons_detach(int port)
394 struct dcons_softc *dc;
406 dcons_modevent(module_t mode, int type, void *data)
412 ret = dcons_drv_init(1);
416 dcons_cnprobe(&dcons_consdev);
417 dcons_cninit(&dcons_consdev);
418 cnadd(&dcons_consdev);
422 printf("dcons: unload\n");
424 callout_stop(&dcons_callout);
425 cnremove(&dcons_consdev);
426 dcons_detach(DCONS_CON);
427 dcons_detach(DCONS_GDB);
430 contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
435 #if 0 /* Keep connection after halt */
447 /* Debugger interface */
450 dcons_os_getc(struct dcons_softc *dc)
454 while ((c = dcons_os_checkc(dc)) == -1);
460 dcons_dbg_probe(void)
464 if (getenv_int("dcons_gdb", &dcons_gdb) == 0)
480 dcons_dbg_putc(int c)
482 struct dcons_softc *dc = &sc[DCONS_GDB];
483 dcons_os_putc(dc, c);
489 struct dcons_softc *dc = &sc[DCONS_GDB];
490 return (dcons_os_getc(dc));
494 DEV_MODULE(dcons, dcons_modevent, NULL);
495 MODULE_VERSION(dcons, DCONS_VERSION);