summaryrefslogtreecommitdiff
path: root/device/cons.c
blob: a06fdf3b665b5e60720f7041b0fe32d1e7b59103 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
/*
 * Copyright (c) 1988-1994, The University of Utah and
 * the Computer Systems Laboratory (CSL).  All rights reserved.
 *
 * Permission to use, copy, modify and distribute this software is hereby
 * granted provided that (1) source code retains these copyright, permission,
 * and disclaimer notices, and (2) redistributions including binaries
 * reproduce the notices in supporting documentation, and (3) all advertising
 * materials mentioning features or use of this software display the following
 * acknowledgement: ``This product includes software developed by the
 * Computer Systems Laboratory at the University of Utah.''
 *
 * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
 * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
 * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
 *
 * CSL requests users of this software to return to csl-dist@cs.utah.edu any
 * improvements that they make and grant CSL redistribution rights.
 *
 *      Utah $Hdr: cons.c 1.14 94/12/14$
 */

#ifdef MACH_KERNEL
#include <sys/types.h>
#include <device/conf.h>
#include <mach/boolean.h>
#include <cons.h>
#else
#include <sys/param.h>
#include <sys/user.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/file.h>
#include <sys/conf.h>
#include <hpdev/cons.h>
#endif

#ifdef MACH_KMSG
#include <device/io_req.h>
#include <kmsg.h>
#endif

static	int cn_inited = 0;
static	struct consdev *cn_tab = 0;	/* physical console device info */
#ifndef MACH_KERNEL
static	struct tty *constty = 0;	/* virtual console output device */
#endif

/*
 * ROM getc/putc primitives.
 * On some architectures, the boot ROM provides basic character input/output
 * routines that can be used before devices are configured or virtual memory
 * is enabled.  This can be useful to debug (or catch panics from) code early
 * in the bootstrap procedure.
 */
int	(*romgetc)() = 0;
void	(*romputc)() = 0;

#if CONSBUFSIZE > 0
/*
 * Temporary buffer to store console output before a console is selected.
 * This is statically allocated so it can be called before malloc/kmem_alloc
 * have been initialized.  It is initialized so it won't be clobbered as
 * part of the zeroing of BSS (on PA/Mach).
 */
static	char consbuf[CONSBUFSIZE] = { 0 };
static	char *consbp = consbuf;
static	int consbufused = 0;
#endif

cninit()
{
	struct consdev *cp;
#ifdef MACH_KERNEL
	dev_ops_t cn_ops;
	int x;
#endif

	if (cn_inited)
		return;

	/*
	 * Collect information about all possible consoles
	 * and find the one with highest priority
	 */
	for (cp = constab; cp->cn_probe; cp++) {
		(*cp->cn_probe)(cp);
		if (cp->cn_pri > CN_DEAD &&
		    (cn_tab == NULL || cp->cn_pri > cn_tab->cn_pri))
			cn_tab = cp;
	}
	
	/*
	 * Found a console, initialize it.
	 */
	if (cp = cn_tab) { 
		/*
		 * Initialize as console
		 */
		(*cp->cn_init)(cp);
#ifdef MACH_KERNEL
		/*
		 * Look up its dev_ops pointer in the device table and
		 * place it in the device indirection table.
		 */
		if (dev_name_lookup(cp->cn_name, &cn_ops, &x) == FALSE)
			panic("cninit: dev_name_lookup failed");
		dev_set_indirection("console", cn_ops, minor(cp->cn_dev));
#endif
#if CONSBUFSIZE > 0
		/*
		 * Now that the console is initialized, dump any chars in
		 * the temporary console buffer.
		 */
		if (consbufused) {
			char *cbp = consbp;
			do {
				if (*cbp)
					cnputc(*cbp);
				if (++cbp == &consbuf[CONSBUFSIZE])
					cbp = consbuf;
			} while (cbp != consbp);
			consbufused = 0;
		}
#endif
		cn_inited = 1;
		return;
	}
	/*
	 * No console device found, not a problem for BSD, fatal for Mach
	 */
#ifdef MACH_KERNEL
	panic("can't find a console device");
#endif
}

#ifndef MACH_KERNEL
cnopen(dev, flag)
	dev_t dev;
{
	if (cn_tab == NULL)
		return(0);
	dev = cn_tab->cn_dev;
	return ((*cdevsw[major(dev)].d_open)(dev, flag));
}
 
cnclose(dev, flag)
	dev_t dev;
{
	if (cn_tab == NULL)
		return(0);
	dev = cn_tab->cn_dev;
	return ((*cdevsw[major(dev)].d_close)(dev, flag));
}
 
cnread(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	if (cn_tab == NULL)
		return(0);
	dev = cn_tab->cn_dev;
	return ((*cdevsw[major(dev)].d_read)(dev, uio));
}
 
cnwrite(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	if (cn_tab == NULL)
		return(0);
	dev = cn_tab->cn_dev;
	return ((*cdevsw[major(dev)].d_write)(dev, uio));
}
 
cnioctl(dev, cmd, data, flag)
	dev_t dev;
	caddr_t data;
{
	if (cn_tab == NULL)
		return(0);
	/*
	 * Superuser can always use this to wrest control of console
	 * output from the "virtual" console.
	 */
	if (cmd == TIOCCONS && constty) {
		if (!suser())
			return(EPERM);
		constty = NULL;
		return(0);
	}
	dev = cn_tab->cn_dev;
	return ((*cdevsw[major(dev)].d_ioctl)(dev, cmd, data, flag));
}

cnselect(dev, rw)
	dev_t dev;
	int rw;
{
	if (cn_tab == NULL)
		return(1);
	return(ttselect(cn_tab->cn_dev, rw));
}

#ifndef hp300
/*
 * XXX Should go away when the new CIO MUX driver is in place
 */
#define	d_control	d_mmap
cncontrol(dev, cmd, data)
	dev_t dev;
	int cmd;
	int data;
{
	if (cn_tab == NULL)
		return(0);
	dev = cn_tab->cn_dev;
	return((*cdevsw[major(dev)].d_control)(dev, cmd, data));
}
#undef	d_control
#endif
#endif

cngetc()
{
	if (cn_tab)
		return ((*cn_tab->cn_getc)(cn_tab->cn_dev, 1));
	if (romgetc)
		return ((*romgetc)(1));
	return (0);
}

#ifdef MACH_KERNEL
cnmaygetc()
{
	if (cn_tab)
		return((*cn_tab->cn_getc)(cn_tab->cn_dev, 0));
	if (romgetc)
		return ((*romgetc)(0));
	return (0);
}
#endif

cnputc(c)
	int c;
{
	if (c == 0)
		return;

#ifdef MACH_KMSG
	/* XXX: Assume that All output routines always use cnputc. */
	kmsg_putchar (c);
#endif
	
	if (cn_tab) {
		(*cn_tab->cn_putc)(cn_tab->cn_dev, c);
		if (c == '\n')
			(*cn_tab->cn_putc)(cn_tab->cn_dev, '\r');
	} else if (romputc) {
		(*romputc)(c);
		if (c == '\n')
			(*romputc)('\r');
	}
#if CONSBUFSIZE > 0
	else {
		if (consbufused == 0) {
			consbp = consbuf;
			consbufused = 1;
			bzero(consbuf, CONSBUFSIZE);
		}
		*consbp++ = c;
		if (consbp >= &consbuf[CONSBUFSIZE])
			consbp = consbuf;
	}
#endif
}