xref: /freebsd/sys/dev/dcons/dcons_os.c (revision 6472ac3d) 
1 /*-
2  * Copyright (C) 2003,2004
3  * 	Hidetoshi Shimokawa. 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  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *
16  *	This product includes software developed by Hidetoshi Shimokawa.
17  *
18  * 4. Neither the name of the author nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  *
34  * $FreeBSD$
35  */
36 
37 #include <sys/param.h>
38 #include <sys/kdb.h>
39 #include <gdb/gdb.h>
40 #include <sys/kernel.h>
41 #include <sys/module.h>
42 #include <sys/systm.h>
43 #include <sys/types.h>
44 #include <sys/conf.h>
45 #include <sys/cons.h>
46 #include <sys/consio.h>
47 #include <sys/tty.h>
48 #include <sys/malloc.h>
49 #include <sys/priv.h>
50 #include <sys/proc.h>
51 #include <sys/ucred.h>
52 
53 #include <machine/bus.h>
54 
55 #include <dev/dcons/dcons.h>
56 #include <dev/dcons/dcons_os.h>
57 
58 #include <ddb/ddb.h>
59 #include <sys/reboot.h>
60 
61 #include <sys/sysctl.h>
62 
63 #include <vm/vm.h>
64 #include <vm/vm_param.h>
65 #include <vm/pmap.h>
66 
67 #include "opt_dcons.h"
68 #include "opt_kdb.h"
69 #include "opt_gdb.h"
70 #include "opt_ddb.h"
71 
72 
73 #ifndef DCONS_POLL_HZ
74 #define DCONS_POLL_HZ	25
75 #endif
76 
77 #ifndef DCONS_BUF_SIZE
78 #define DCONS_BUF_SIZE (16*1024)
79 #endif
80 
81 #ifndef DCONS_FORCE_CONSOLE
82 #define DCONS_FORCE_CONSOLE	0	/* Mostly for FreeBSD-4/DragonFly */
83 #endif
84 
85 #ifndef KLD_MODULE
86 static char bssbuf[DCONS_BUF_SIZE];	/* buf in bss */
87 #endif
88 
89 /* global data */
90 static struct dcons_global dg;
91 struct dcons_global *dcons_conf;
92 static int poll_hz = DCONS_POLL_HZ;
93 
94 static struct dcons_softc sc[DCONS_NPORT];
95 
96 static SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
97 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
98 				"dcons polling rate");
99 
100 static int drv_init = 0;
101 static struct callout dcons_callout;
102 struct dcons_buf *dcons_buf;		/* for local dconschat */
103 
104 static void	dcons_timeout(void *);
105 static int	dcons_drv_init(int);
106 
107 static cn_probe_t	dcons_cnprobe;
108 static cn_init_t	dcons_cninit;
109 static cn_term_t	dcons_cnterm;
110 static cn_getc_t	dcons_cngetc;
111 static cn_putc_t	dcons_cnputc;
112 
113 CONSOLE_DRIVER(dcons);
114 
115 #if defined(GDB)
116 static gdb_probe_f	dcons_dbg_probe;
117 static gdb_init_f	dcons_dbg_init;
118 static gdb_term_f	dcons_dbg_term;
119 static gdb_getc_f	dcons_dbg_getc;
120 static gdb_putc_f	dcons_dbg_putc;
121 
122 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term,
123     dcons_dbg_getc, dcons_dbg_putc);
124 
125 extern struct gdb_dbgport *gdb_cur;
126 #endif
127 
128 static tsw_outwakeup_t dcons_outwakeup;
129 
130 static struct ttydevsw dcons_ttydevsw = {
131 	.tsw_flags      = TF_NOPREFIX,
132 	.tsw_outwakeup  = dcons_outwakeup,
133 };
134 
135 #if (defined(GDB) || defined(DDB))
136 static int
137 dcons_check_break(struct dcons_softc *dc, int c)
138 {
139 
140 	if (c < 0)
141 		return (c);
142 
143 #ifdef GDB
144 	if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport)
145 		kdb_alt_break_gdb(c, &dc->brk_state);
146 	else
147 #endif
148 		kdb_alt_break(c, &dc->brk_state);
149 
150 	return (c);
151 }
152 #else
153 #define	dcons_check_break(dc, c)	(c)
154 #endif
155 
156 static int
157 dcons_os_checkc_nopoll(struct dcons_softc *dc)
158 {
159 	int c;
160 
161 	if (dg.dma_tag != NULL)
162 		bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
163 
164 	c = dcons_check_break(dc, dcons_checkc(dc));
165 
166 	if (dg.dma_tag != NULL)
167 		bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD);
168 
169 	return (c);
170 }
171 
172 static int
173 dcons_os_checkc(struct dcons_softc *dc)
174 {
175 	EVENTHANDLER_INVOKE(dcons_poll, 0);
176 	return (dcons_os_checkc_nopoll(dc));
177 }
178 
179 static void
180 dcons_os_putc(struct dcons_softc *dc, int c)
181 {
182 	if (dg.dma_tag != NULL)
183 		bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE);
184 
185 	dcons_putc(dc, c);
186 
187 	if (dg.dma_tag != NULL)
188 		bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
189 }
190 
191 static void
192 dcons_outwakeup(struct tty *tp)
193 {
194 	struct dcons_softc *dc;
195 	char ch;
196 
197 	dc = tty_softc(tp);
198 
199 	while (ttydisc_getc(tp, &ch, sizeof ch) != 0)
200 		dcons_os_putc(dc, ch);
201 }
202 
203 static void
204 dcons_timeout(void *v)
205 {
206 	struct	tty *tp;
207 	struct dcons_softc *dc;
208 	int i, c, polltime;
209 
210 	for (i = 0; i < DCONS_NPORT; i ++) {
211 		dc = &sc[i];
212 		tp = dc->tty;
213 
214 		tty_lock(tp);
215 		while ((c = dcons_os_checkc_nopoll(dc)) != -1)
216 			ttydisc_rint(tp, c, 0);
217 		ttydisc_rint_done(tp);
218 		tty_unlock(tp);
219 	}
220 	polltime = hz / poll_hz;
221 	if (polltime < 1)
222 		polltime = 1;
223 	callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
224 }
225 
226 static void
227 dcons_cnprobe(struct consdev *cp)
228 {
229 	sprintf(cp->cn_name, "dcons");
230 #if DCONS_FORCE_CONSOLE
231 	cp->cn_pri = CN_REMOTE;
232 #else
233 	cp->cn_pri = CN_NORMAL;
234 #endif
235 }
236 
237 static void
238 dcons_cninit(struct consdev *cp)
239 {
240 	dcons_drv_init(0);
241 	cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
242 }
243 
244 static void
245 dcons_cnterm(struct consdev *cp)
246 {
247 }
248 
249 static int
250 dcons_cngetc(struct consdev *cp)
251 {
252 	struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
253 	return (dcons_os_checkc(dc));
254 }
255 
256 static void
257 dcons_cnputc(struct consdev *cp, int c)
258 {
259 	struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
260 	dcons_os_putc(dc, c);
261 }
262 
263 static int
264 dcons_drv_init(int stage)
265 {
266 #if defined(__i386__) || defined(__amd64__)
267 	quad_t addr, size;
268 #endif
269 
270 	if (drv_init)
271 		return(drv_init);
272 
273 	drv_init = -1;
274 
275 	bzero(&dg, sizeof(dg));
276 	dcons_conf = &dg;
277 	dg.cdev = &dcons_consdev;
278 	dg.buf = NULL;
279 	dg.size = DCONS_BUF_SIZE;
280 
281 #if defined(__i386__) || defined(__amd64__)
282 	if (getenv_quad("dcons.addr", &addr) > 0 &&
283 	    getenv_quad("dcons.size", &size) > 0) {
284 #ifdef __i386__
285 		vm_paddr_t pa;
286 		/*
287 		 * Allow read/write access to dcons buffer.
288 		 */
289 		for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE)
290 			*vtopte(KERNBASE + pa) |= PG_RW;
291 		invltlb();
292 #endif
293 		/* XXX P to V */
294 		dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr);
295 		dg.size = size;
296 		if (dcons_load_buffer(dg.buf, dg.size, sc) < 0)
297 			dg.buf = NULL;
298 	}
299 #endif
300 	if (dg.buf != NULL)
301 		goto ok;
302 
303 #ifndef KLD_MODULE
304 	if (stage == 0) { /* XXX or cold */
305 		/*
306 		 * DCONS_FORCE_CONSOLE == 1 and statically linked.
307 		 * called from cninit(). can't use contigmalloc yet .
308 		 */
309 		dg.buf = (struct dcons_buf *) bssbuf;
310 		dcons_init(dg.buf, dg.size, sc);
311 	} else
312 #endif
313 	{
314 		/*
315 		 * DCONS_FORCE_CONSOLE == 0 or kernel module case.
316 		 * if the module is loaded after boot,
317 		 * bssbuf could be non-continuous.
318 		 */
319 		dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
320 			M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
321 		if (dg.buf == NULL)
322 			return (-1);
323 		dcons_init(dg.buf, dg.size, sc);
324 	}
325 
326 ok:
327 	dcons_buf = dg.buf;
328 
329 	drv_init = 1;
330 
331 	return 0;
332 }
333 
334 
335 static int
336 dcons_attach_port(int port, char *name, int flags)
337 {
338 	struct dcons_softc *dc;
339 	struct tty *tp;
340 
341 	dc = &sc[port];
342 	tp = tty_alloc(&dcons_ttydevsw, dc);
343 	dc->flags = flags;
344 	dc->tty   = tp;
345 	tty_init_console(tp, 0);
346 	tty_makedev(tp, NULL, "%s", name);
347 	return(0);
348 }
349 
350 static int
351 dcons_attach(void)
352 {
353 	int polltime;
354 
355 	dcons_attach_port(DCONS_CON, "dcons", 0);
356 	dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
357 	callout_init(&dcons_callout, CALLOUT_MPSAFE);
358 	polltime = hz / poll_hz;
359 	if (polltime < 1)
360 		polltime = 1;
361 	callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
362 	return(0);
363 }
364 
365 static int
366 dcons_detach(int port)
367 {
368 	struct	tty *tp;
369 	struct dcons_softc *dc;
370 
371 	dc = &sc[port];
372 	tp = dc->tty;
373 
374 	tty_lock(tp);
375 	tty_rel_gone(tp);
376 
377 	return(0);
378 }
379 
380 static int
381 dcons_modevent(module_t mode, int type, void *data)
382 {
383 	int err = 0, ret;
384 
385 	switch (type) {
386 	case MOD_LOAD:
387 		ret = dcons_drv_init(1);
388 		if (ret != -1)
389 			dcons_attach();
390 		if (ret == 0) {
391 			dcons_cnprobe(&dcons_consdev);
392 			dcons_cninit(&dcons_consdev);
393 			cnadd(&dcons_consdev);
394 		}
395 		break;
396 	case MOD_UNLOAD:
397 		printf("dcons: unload\n");
398 		if (drv_init == 1) {
399 			callout_stop(&dcons_callout);
400 			cnremove(&dcons_consdev);
401 			dcons_detach(DCONS_CON);
402 			dcons_detach(DCONS_GDB);
403 			dg.buf->magic = 0;
404 
405 			contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
406 		}
407 
408 		break;
409 	case MOD_SHUTDOWN:
410 #if 0		/* Keep connection after halt */
411 		dg.buf->magic = 0;
412 #endif
413 		break;
414 	default:
415 		err = EOPNOTSUPP;
416 		break;
417 	}
418 	return(err);
419 }
420 
421 #if defined(GDB)
422 /* Debugger interface */
423 
424 static int
425 dcons_os_getc(struct dcons_softc *dc)
426 {
427 	int c;
428 
429 	while ((c = dcons_os_checkc(dc)) == -1);
430 
431 	return (c & 0xff);
432 }
433 
434 static int
435 dcons_dbg_probe(void)
436 {
437 	int dcons_gdb;
438 
439 	if (getenv_int("dcons_gdb", &dcons_gdb) == 0)
440 		return (-1);
441 	return (dcons_gdb);
442 }
443 
444 static void
445 dcons_dbg_init(void)
446 {
447 }
448 
449 static void
450 dcons_dbg_term(void)
451 {
452 }
453 
454 static void
455 dcons_dbg_putc(int c)
456 {
457 	struct dcons_softc *dc = &sc[DCONS_GDB];
458 	dcons_os_putc(dc, c);
459 }
460 
461 static int
462 dcons_dbg_getc(void)
463 {
464 	struct dcons_softc *dc = &sc[DCONS_GDB];
465 	return (dcons_os_getc(dc));
466 }
467 #endif
468 
469 DEV_MODULE(dcons, dcons_modevent, NULL);
470 MODULE_VERSION(dcons, DCONS_VERSION);
471