- Split dcons core code and OS dependent code.

- Implement dcons_ischar() and dcons_load_buffer().
- If loader passed a dcons buffer address, keep using it.
	(We still need a patch to cheat memory management system.)

1 files changed, 71 insertions, 642 deletions

diff --git a/sys/dev/dcons/dcons.c b/sys/dev/dcons/dcons.c
index 284a3b0..b48a504 100644
--- a/sys/dev/dcons/dcons.c
+++ b/sys/dev/dcons/dcons.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003
+ * Copyright (C) 2003,2004
  * 	Hidetoshi Shimokawa. All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
@@ -36,387 +36,42 @@
  */
 
 #include <sys/param.h>
-#if __FreeBSD_version >= 502122
-#include <sys/kdb.h>
-#include <gdb/gdb.h>
-#endif
-#include <sys/kernel.h>
-#include <sys/module.h>
-#include <sys/systm.h>
-#include <sys/types.h>
-#include <sys/conf.h>
-#include <sys/cons.h>
-#include <sys/consio.h>
-#include <sys/tty.h>
-#include <sys/malloc.h>
-#include <sys/proc.h>
-#include <sys/ucred.h>
-
-#include <machine/bus.h>
 
-#ifdef __DragonFly__
+#if defined(__DragonFly__) || defined(_BOOT)
 #include "dcons.h"
 #else
 #include <dev/dcons/dcons.h>
 #endif
 
-#include <ddb/ddb.h>
-#include <sys/reboot.h>
-
-#include <sys/sysctl.h>
-
-#include "opt_ddb.h"
-#include "opt_comconsole.h"
-#include "opt_dcons.h"
-
-#ifndef DCONS_POLL_HZ
-#define DCONS_POLL_HZ	100
-#endif
-
-#ifndef DCONS_BUF_SIZE
-#define DCONS_BUF_SIZE (16*1024)
-#endif
-
-#ifndef DCONS_FORCE_CONSOLE
-#define DCONS_FORCE_CONSOLE	0	/* Mostly for FreeBSD-4/DragonFly */
-#endif
-
-#ifndef DCONS_FORCE_GDB
-#define DCONS_FORCE_GDB	1
-#endif
-
-#if __FreeBSD_version >= 500101
-#define CONS_NODEV	1
-#if __FreeBSD_version < 502122
-static struct consdev gdbconsdev;
-#endif
-#endif
-
-static d_open_t		dcons_open;
-static d_close_t	dcons_close;
-#if defined(__DragonFly__) || __FreeBSD_version < 500104
-static d_ioctl_t	dcons_ioctl;
-#endif
-
-static struct cdevsw dcons_cdevsw = {
-#ifdef __DragonFly__
-#define CDEV_MAJOR      184
-	"dcons", CDEV_MAJOR, D_TTY, NULL, 0,
-	dcons_open, dcons_close, ttyread, ttywrite, dcons_ioctl,
-	ttypoll, nommap, nostrategy, nodump, nopsize,
-#elif __FreeBSD_version >= 500104
-	.d_version =	D_VERSION,
-	.d_open =	dcons_open,
-	.d_close =	dcons_close,
-	.d_name =	"dcons",
-	.d_flags =	D_TTY | D_NEEDGIANT,
-#else
-#define CDEV_MAJOR      184
-	/* open */	dcons_open,
-	/* close */	dcons_close,
-	/* read */	ttyread,
-	/* write */	ttywrite,
-	/* ioctl */	dcons_ioctl,
-	/* poll */	ttypoll,
-	/* mmap */	nommap,
-	/* strategy */	nostrategy,
-	/* name */	"dcons",
-	/* major */	CDEV_MAJOR,
-	/* dump */	nodump,
-	/* psize */	nopsize,
-	/* flags */	D_TTY,
-#endif
-};
-
-#ifndef KLD_MODULE
-static char bssbuf[DCONS_BUF_SIZE];	/* buf in bss */
-#endif
-
-/* global data */
-static struct dcons_global dg;
-struct dcons_global *dcons_conf;
-static int poll_hz = DCONS_POLL_HZ;
-
-SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
-SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
-				"dcons polling rate");
-
-static int drv_init = 0;
-static struct callout dcons_callout;
-struct dcons_buf *dcons_buf;		/* for local dconschat */
-
-#ifdef __DragonFly__
-#define DEV	dev_t
-#define THREAD	d_thread_t
-#elif __FreeBSD_version < 500000
-#define DEV	dev_t
-#define THREAD	struct proc
-#else
-#define DEV	struct cdev *
-#define THREAD	struct thread
-#endif
-
-/* per device data */
-static struct dcons_softc {
-	DEV dev;
-	struct dcons_ch	o, i;
-	int brk_state;
-#define DC_GDB	1
-	int flags;
-} sc[DCONS_NPORT];
-static void	dcons_tty_start(struct tty *);
-static int	dcons_tty_param(struct tty *, struct termios *);
-static void	dcons_timeout(void *);
-static int	dcons_drv_init(int);
-static int	dcons_getc(struct dcons_softc *);
-static int	dcons_checkc(struct dcons_softc *);
-static void	dcons_putc(struct dcons_softc *, int);
-
-static cn_probe_t	dcons_cnprobe;
-static cn_init_t	dcons_cninit;
-static cn_getc_t	dcons_cngetc;
-static cn_checkc_t 	dcons_cncheckc;
-static cn_putc_t	dcons_cnputc;
-
-CONS_DRIVER(dcons, dcons_cnprobe, dcons_cninit, NULL, dcons_cngetc,
-    dcons_cncheckc, dcons_cnputc, NULL);
-
-#if __FreeBSD_version >= 502122
-static gdb_probe_f dcons_dbg_probe;
-static gdb_init_f dcons_dbg_init;
-static gdb_term_f dcons_dbg_term;
-static gdb_getc_f dcons_dbg_getc;
-static gdb_checkc_f dcons_dbg_checkc;
-static gdb_putc_f dcons_dbg_putc;
-
-GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term,
-    dcons_dbg_checkc, dcons_dbg_getc, dcons_dbg_putc);
-
-extern struct gdb_dbgport *gdb_cur;
-#endif
-
-static int
-dcons_open(DEV dev, int flag, int mode, THREAD *td)
-{
-	struct tty *tp;
-	int unit, error, s;
-
-	unit = minor(dev);
-	if (unit != 0)
-		return (ENXIO);
-
-	tp = dev->si_tty = ttymalloc(dev->si_tty);
-	tp->t_oproc = dcons_tty_start;
-	tp->t_param = dcons_tty_param;
-	tp->t_stop = nottystop;
-	tp->t_dev = dev;
-
-	error = 0;
-
-	s = spltty();
-	if ((tp->t_state & TS_ISOPEN) == 0) {
-		tp->t_state |= TS_CARR_ON;
-		ttychars(tp);
-		tp->t_iflag = TTYDEF_IFLAG;
-		tp->t_oflag = TTYDEF_OFLAG;
-		tp->t_cflag = TTYDEF_CFLAG|CLOCAL;
-		tp->t_lflag = TTYDEF_LFLAG;
-		tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
-		ttsetwater(tp);
-	} else if ((tp->t_state & TS_XCLUDE) && suser(td)) {
-		splx(s);
-		return (EBUSY);
-	}
-	splx(s);
-
-#if __FreeBSD_version < 502113
-	error = (*linesw[tp->t_line].l_open)(dev, tp);
-#else
-	error = ttyld_open(tp, dev);
-#endif
-
-	return (error);
-}
-
-static int
-dcons_close(DEV dev, int flag, int mode, THREAD *td)
+int
+dcons_ischar(struct dcons_softc *dc)
 {
-	int	unit;
-	struct	tty *tp;
-
-	unit = minor(dev);
-	if (unit != 0)
-		return (ENXIO);
-
-	tp = dev->si_tty;
-	if (tp->t_state & TS_ISOPEN) {
-#if __FreeBSD_version < 502113
-		(*linesw[tp->t_line].l_close)(tp, flag);
-		ttyclose(tp);
-#else
-		ttyld_close(tp, flag);
-		tty_close(tp);
-#endif
-	}
-
-	return (0);
-}
-
-#if defined(__DragonFly__) || __FreeBSD_version < 500104
-static int
-dcons_ioctl(DEV dev, u_long cmd, caddr_t data, int flag, THREAD *td)
-{
-	int	unit;
-	struct	tty *tp;
-	int	error;
-
-	unit = minor(dev);
-	if (unit != 0)
-		return (ENXIO);
-
-	tp = dev->si_tty;
-	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, td);
-	if (error != ENOIOCTL)
-		return (error);
-
-	error = ttioctl(tp, cmd, data, flag);
-	if (error != ENOIOCTL)
-		return (error);
-
-	return (ENOTTY);
-}
-#endif
-
-static int
-dcons_tty_param(struct tty *tp, struct termios *t)
-{
-	tp->t_ispeed = t->c_ispeed;
-	tp->t_ospeed = t->c_ospeed;
-	tp->t_cflag = t->c_cflag;
-	return 0;
-}
-
-static void
-dcons_tty_start(struct tty *tp)
-{
-	struct dcons_softc *dc;
-	int s;
-
-	dc = (struct dcons_softc *)tp->t_dev->si_drv1;
-	s = spltty();
-	if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP)) {
-		ttwwakeup(tp);
-		return;
-	}
-
-	tp->t_state |= TS_BUSY;
-	while (tp->t_outq.c_cc != 0)
-		dcons_putc(dc, getc(&tp->t_outq));
-	tp->t_state &= ~TS_BUSY;
+	u_int32_t ptr, pos, gen, next_gen;
+	struct dcons_ch *ch;
 
-	ttwwakeup(tp);
-	splx(s);
-}
+	ch = &dc->i;
 
-static void
-dcons_timeout(void *v)
-{
-	struct	tty *tp;
-	struct dcons_softc *dc;
-	int i, c, polltime;
+	ptr = ntohl(*ch->ptr);
+	gen = ptr >> DCONS_GEN_SHIFT;
+	pos = ptr & DCONS_POS_MASK;
+	if (gen == ch->gen && pos == ch->pos)
+		return (0);
 
-	for (i = 0; i < DCONS_NPORT; i ++) {
-		dc = &sc[i];
-		tp = dc->dev->si_tty;
-		while ((c = dcons_checkc(dc)) != -1)
-			if (tp->t_state & TS_ISOPEN)
-#if __FreeBSD_version < 502113
-				(*linesw[tp->t_line].l_rint)(c, tp);
-#else
-				ttyld_rint(tp, c);
-#endif
+	next_gen = DCONS_NEXT_GEN(ch->gen);
+	/* XXX sanity check */
+	if ((gen != ch->gen && gen != next_gen)
+			|| (gen == ch->gen && pos < ch->pos)) {
+		/* generation skipped !! */
+		/* XXX discard */
+		ch->gen = gen;
+		ch->pos = pos;
+		return (0);
 	}
-	polltime = hz / poll_hz;
-	if (polltime < 1)
-		polltime = 1;
-	callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
-}
-
-static void
-dcons_cnprobe(struct consdev *cp)
-{
-#ifdef __DragonFly__
-	cp->cn_dev = make_dev(&dcons_cdevsw, DCONS_CON,
-	    UID_ROOT, GID_WHEEL, 0600, "dcons");
-#elif __FreeBSD_version >= 501109
-	sprintf(cp->cn_name, "dcons");
-#else
-	cp->cn_dev = makedev(CDEV_MAJOR, DCONS_CON);
-#endif
-#if DCONS_FORCE_CONSOLE
-	cp->cn_pri = CN_REMOTE;
-#else
-	cp->cn_pri = CN_NORMAL;
-#endif
-}
-
-static void
-dcons_cninit(struct consdev *cp)
-{
-	dcons_drv_init(0);
-#if CONS_NODEV
-	cp->cn_arg
-#else
-	cp->cn_dev->si_drv1
-#endif
-		= (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
-}
-
-#if CONS_NODEV
-static int
-dcons_cngetc(struct consdev *cp)
-{
-	return(dcons_getc((struct dcons_softc *)cp->cn_arg));
-}
-static int
-dcons_cncheckc(struct consdev *cp)
-{
-	return(dcons_checkc((struct dcons_softc *)cp->cn_arg)); 
-}
-static void
-dcons_cnputc(struct consdev *cp, int c)
-{
-	dcons_putc((struct dcons_softc *)cp->cn_arg, c);
-}
-#else
-static int
-dcons_cngetc(DEV dev)
-{
-	return(dcons_getc((struct dcons_softc *)dev->si_drv1));
-}
-static int
-dcons_cncheckc(DEV dev)
-{
-	return(dcons_checkc((struct dcons_softc *)dev->si_drv1));
-}
-static void
-dcons_cnputc(DEV dev, int c)
-{
-	dcons_putc((struct dcons_softc *)dev->si_drv1, c);
-}
-#endif
-
-static int
-dcons_getc(struct dcons_softc *dc)
-{
-	int c;
 
-	while ((c = dcons_checkc(dc)) == -1);
-
-	return (c & 0xff);
+	return (1);
 }
 
-static int
+int
 dcons_checkc(struct dcons_softc *dc)
 {
 	unsigned char c;
@@ -425,8 +80,6 @@ dcons_checkc(struct dcons_softc *dc)
 
 	ch = &dc->i;
 
-	if (dg.dma_tag != NULL)
-		bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
 	ptr = ntohl(*ch->ptr);
 	gen = ptr >> DCONS_GEN_SHIFT;
 	pos = ptr & DCONS_POS_MASK;
@@ -451,45 +104,10 @@ dcons_checkc(struct dcons_softc *dc)
 		ch->pos = 0;
 	}
 
-#if __FreeBSD_version >= 502122
-#if KDB && ALT_BREAK_TO_DEBUGGER
-	if (kdb_alt_break(c, &dc->brk_state)) {
-		if ((dc->flags & DC_GDB) != 0) {
-			if (gdb_cur == &dcons_gdb_dbgport) {
-				kdb_dbbe_select("gdb");
-				breakpoint();
-			}
-		} else
-			breakpoint();
-	}
-#endif
-#else
-#if DDB && ALT_BREAK_TO_DEBUGGER
-	switch (dc->brk_state) {
-	case STATE1:
-		if (c == KEY_TILDE)
-			dc->brk_state = STATE2;
-		else
-			dc->brk_state = STATE0;
-		break;
-	case STATE2:
-		dc->brk_state = STATE0;
-		if (c == KEY_CTRLB) {
-#if DCONS_FORCE_GDB
-			if (dc->flags & DC_GDB)
-				boothowto |= RB_GDB;
-#endif
-			breakpoint();
-		}
-	}
-	if (c == KEY_CR)
-		dc->brk_state = STATE1;
-#endif
-#endif
 	return (c);
 }
 
-static void
+void
 dcons_putc(struct dcons_softc *dc, int c)
 {
 	struct dcons_ch *ch;
@@ -503,12 +121,11 @@ dcons_putc(struct dcons_softc *dc, int c)
 		ch->pos = 0;
 	}
 	*ch->ptr = DCONS_MAKE_PTR(ch);
-	if (dg.dma_tag != NULL)
-		bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
 }
 
 static int
-dcons_init_port(int port, int offset, int size)
+dcons_init_port(int port, int offset, int size, struct dcons_buf *buf,
+    struct dcons_softc *sc)
 {
 	int osize;
 	struct dcons_softc *dc;
@@ -519,259 +136,71 @@ dcons_init_port(int port, int offset, int size)
 
 	dc->o.size = osize;
 	dc->i.size = size - osize;
-	dc->o.buf = (char *)dg.buf + offset;
+	dc->o.buf = (char *)buf + offset;
 	dc->i.buf = dc->o.buf + osize;
 	dc->o.gen = dc->i.gen = 0;
 	dc->o.pos = dc->i.pos = 0;
-	dc->o.ptr = &dg.buf->optr[port];
-	dc->i.ptr = &dg.buf->iptr[port];
+	dc->o.ptr = &buf->optr[port];
+	dc->i.ptr = &buf->iptr[port];
 	dc->brk_state = STATE0;
-	dg.buf->osize[port] = htonl(osize);
-	dg.buf->isize[port] = htonl(size - osize);
-	dg.buf->ooffset[port] = htonl(offset);
-	dg.buf->ioffset[port] = htonl(offset + osize);
-	dg.buf->optr[port] = DCONS_MAKE_PTR(&dc->o);
-	dg.buf->iptr[port] = DCONS_MAKE_PTR(&dc->i);
+	buf->osize[port] = htonl(osize);
+	buf->isize[port] = htonl(size - osize);
+	buf->ooffset[port] = htonl(offset);
+	buf->ioffset[port] = htonl(offset + osize);
+	buf->optr[port] = DCONS_MAKE_PTR(&dc->o);
+	buf->iptr[port] = DCONS_MAKE_PTR(&dc->i);
 
 	return(0);
 }
 
-static int
-dcons_drv_init(int stage)
-{
-	int size, size0, offset;
-
-	if (drv_init)
-		return(drv_init);
-
-	drv_init = -1;
-
-	bzero(&dg, sizeof(dg));
-	dcons_conf = &dg;
-	dg.cdev = &dcons_consdev;
-	dg.size = DCONS_BUF_SIZE;
-
-#ifndef KLD_MODULE
-	if (stage == 0) /* XXX or cold */
-		/*
-		 * DCONS_FORCE_CONSOLE == 1 and statically linked.
-		 * called from cninit(). can't use contigmalloc yet .
-		 */
-		dg.buf = (struct dcons_buf *) bssbuf;
-	else
-#endif
-		/*
-		 * DCONS_FORCE_CONSOLE == 0 or kernel module case.
-		 * if the module is loaded after boot,
-		 * bssbuf could be non-continuous.
-		 */ 
-		dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
-			M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
-
-	dcons_buf = dg.buf;
-	offset = DCONS_HEADER_SIZE;
-	size = (dg.size - offset);
-	size0 = size * 3 / 4;
-
-	dcons_init_port(0, offset, size0);
-	offset += size0;
-	dcons_init_port(1, offset, size - size0);
-	dg.buf->version = htonl(DCONS_VERSION);
-	dg.buf->magic = ntohl(DCONS_MAGIC);
-
-#if __FreeBSD_version < 502122
-#if DDB && DCONS_FORCE_GDB
-#if CONS_NODEV
-	gdbconsdev.cn_arg = (void *)&sc[DCONS_GDB];
-#if __FreeBSD_version >= 501109
-	sprintf(gdbconsdev.cn_name, "dgdb");
-#endif
-	gdb_arg = &gdbconsdev;
-#elif defined(__DragonFly__)
-	gdbdev = make_dev(&dcons_cdevsw, DCONS_GDB,
-	    UID_ROOT, GID_WHEEL, 0600, "dgdb");
-#else
-	gdbdev = makedev(CDEV_MAJOR, DCONS_GDB);
-#endif
-	gdb_getc = dcons_cngetc;
-	gdb_putc = dcons_cnputc;
-#endif
-#endif
-	drv_init = 1;
-
-	return 0;
-}
-
-
-static int
-dcons_attach_port(int port, char *name, int flags)
+int
+dcons_load_buffer(struct dcons_buf *buf, int size, struct dcons_softc *sc)
 {
+	int port, s;
 	struct dcons_softc *dc;
-	struct tty *tp;
-
-	dc = &sc[port];
-	dc->flags = flags;
-	dc->dev = make_dev(&dcons_cdevsw, port,
-			UID_ROOT, GID_WHEEL, 0600, name);
-	tp = ttymalloc(NULL);
-
-	dc->dev->si_drv1 = (void *)dc;
-	dc->dev->si_tty = tp;
-
-	tp->t_oproc = dcons_tty_start;
-	tp->t_param = dcons_tty_param;
-	tp->t_stop = nottystop;
-	tp->t_dev = dc->dev;
-
-	return(0);
-}
 
-static int
-dcons_attach(void)
-{
-	int polltime;
-
-#ifdef __DragonFly__
-	cdevsw_add(&dcons_cdevsw, -1, 0);
-#endif
-	dcons_attach_port(DCONS_CON, "dcons", 0);
-	dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
-#if __FreeBSD_version < 500000
-	callout_init(&dcons_callout);
-#else
-	callout_init(&dcons_callout, 0);
-#endif
-	polltime = hz / poll_hz;
-	if (polltime < 1)
-		polltime = 1;
-	callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
-	return(0);
-}
-
-static int
-dcons_detach(int port)
-{
-	struct	tty *tp;
-	struct dcons_softc *dc;
-
-	dc = &sc[port];
-
-	tp = dc->dev->si_tty;
-
-	if (tp->t_state & TS_ISOPEN) {
-		printf("dcons: still opened\n");
-#if __FreeBSD_version < 502113
-		(*linesw[tp->t_line].l_close)(tp, 0);
-		tp->t_gen++;
-		ttyclose(tp);
-		ttwakeup(tp);
-		ttwwakeup(tp);
-#else
-		ttyld_close(tp, 0);
-		tty_close(tp);
-#endif
-	}
-	/* XXX
-	 * must wait until all device are closed.
-	 */
-#ifdef __DragonFly__
-	tsleep((void *)dc, 0, "dcodtc", hz/4);
-#else
-	tsleep((void *)dc, PWAIT, "dcodtc", hz/4);
-#endif
-	destroy_dev(dc->dev);
-
-	return(0);
-}
-
-
-/* cnXXX works only for FreeBSD-5 */
-static int
-dcons_modevent(module_t mode, int type, void *data)
-{
-	int err = 0, ret;
-
-	switch (type) {
-	case MOD_LOAD:
-		ret = dcons_drv_init(1);
-		dcons_attach();
-#if __FreeBSD_version >= 500000
-		if (ret == 0) {
-			dcons_cnprobe(&dcons_consdev);
-			dcons_cninit(&dcons_consdev);
-			cnadd(&dcons_consdev);
-		}
-#endif
-		break;
-	case MOD_UNLOAD:
-		printf("dcons: unload\n");
-		callout_stop(&dcons_callout);
-#if __FreeBSD_version < 502122
-#if DDB && DCONS_FORCE_GDB
-#if CONS_NODEV
-		gdb_arg = NULL;
-#else
-		gdbdev = NULL;
-#endif
-#endif
-#endif
-#if __FreeBSD_version >= 500000
-		cnremove(&dcons_consdev);
-#endif
-		dcons_detach(DCONS_CON);
-		dcons_detach(DCONS_GDB);
-		dg.buf->magic = 0;
+	if (buf->version != htonl(DCONS_VERSION))
+		return (-1);
 
-		contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
+	s = DCONS_HEADER_SIZE;
+	for (port = 0; port < DCONS_NPORT; port ++) {
+		dc = &sc[port];
+		dc->o.size = ntohl(buf->osize[port]);
+		dc->i.size = ntohl(buf->isize[port]);
+		dc->o.buf = (char *)buf + ntohl(buf->ooffset[port]);
+		dc->i.buf = (char *)buf + ntohl(buf->ioffset[port]);
+		dc->o.gen = ntohl(buf->optr[port]) >> DCONS_GEN_SHIFT;
+		dc->i.gen = ntohl(buf->iptr[port]) >> DCONS_GEN_SHIFT;
+		dc->o.pos = ntohl(buf->optr[port]) & DCONS_POS_MASK;
+		dc->i.pos = ntohl(buf->iptr[port]) & DCONS_POS_MASK;
+		dc->o.ptr = &buf->optr[port];
+		dc->i.ptr = &buf->iptr[port];
+		dc->brk_state = STATE0;
 
-		break;
-	case MOD_SHUTDOWN:
-		dg.buf->magic = 0;
-		break;
-	default:
-		err = EOPNOTSUPP;
-		break;
+		s += dc->o.size + dc->i.size;
 	}
-	return(err);
-}
-
-#if __FreeBSD_version >= 502122
-/* Debugger interface */
 
-static int
-dcons_dbg_probe(void)
-{
-	return(DCONS_FORCE_GDB);
-}
+	/* sanity check */
+	if (s > size)
+		return (-1);
 
-static void
-dcons_dbg_init(void)
-{
-}
+	buf->magic = ntohl(DCONS_MAGIC);
 
-static void
-dcons_dbg_term(void)
-{
+	return (0);
 }
 
-static void
-dcons_dbg_putc(int c)
+void
+dcons_init(struct dcons_buf *buf, int size, struct dcons_softc *sc)
 {
-	dcons_putc(&sc[DCONS_GDB], c);
-}
+	int size0, size1, offset;
 
-static int
-dcons_dbg_checkc(void)
-{
-	return (dcons_checkc(&sc[DCONS_GDB]));
-}
+	offset = DCONS_HEADER_SIZE;
+	size0 = (size - offset);
+	size1 = size0 * 3 / 4;		/* console port buffer */
 
-static int
-dcons_dbg_getc(void)
-{
-	return (dcons_getc(&sc[DCONS_GDB]));
+	dcons_init_port(0, offset, size1, buf, sc);
+	offset += size1;
+	dcons_init_port(1, offset, size0 - size1, buf, sc);
+	buf->version = htonl(DCONS_VERSION);
+	buf->magic = ntohl(DCONS_MAGIC);
 }
-#endif
-
-DEV_MODULE(dcons, dcons_modevent, NULL);
-MODULE_VERSION(dcons, DCONS_VERSION);