summaryrefslogtreecommitdiff
path: root/xen/console.c
blob: c65e6d29cbb0a58d0bf3d24ed69f5adb41f33b21 (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
/*
 *  Copyright (C) 2006 Samuel Thibault <samuel.thibault@ens-lyon.org>
 *
 * This program is free software ; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation ; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY ; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the program ; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <sys/types.h>
#include <device/tty.h>
#include <device/cons.h>
#include <machine/pmap.h>
#include <machine/machspl.h>
#include <xen/public/io/console.h>
#include "console.h"
#include "ring.h"
#include "evt.h"

/* Hypervisor part */

decl_simple_lock_data(static, outlock);
decl_simple_lock_data(static, inlock);
static struct xencons_interface *console;
static int kd_pollc;
int kb_mode;	/* XXX: actually don't care.  */

#undef hyp_console_write
void hyp_console_write(const char *str, int len)
{
	hyp_console_io (CONSOLEIO_write, len, kvtolin(str));
}

int hypputc(int c)
{
	if (!console) {
		char d = c;
		hyp_console_io(CONSOLEIO_write, 1, kvtolin(&d));
	} else {
		spl_t spl = splhigh();
		simple_lock(&outlock);
		while (hyp_ring_smash(console->out, console->out_prod, console->out_cons)) {
			hyp_console_put("ring smash\n");
			/* TODO: are we allowed to sleep in putc? */
			hyp_yield();
		}
		hyp_ring_cell(console->out, console->out_prod) = c;
		wmb();
		console->out_prod++;
		hyp_event_channel_send(boot_info.console_evtchn);
		simple_unlock(&outlock);
		splx(spl);
	}
	return 0;
}

int hypcnputc(dev_t dev, int c)
{
	return hypputc(c);
}

/* get char by polling, used by debugger */
int hypcngetc(dev_t dev, int wait)
{
	int ret;
	if (wait)
		while (console->in_prod == console->in_cons)
			hyp_yield();
	else
		if (console->in_prod == console->in_cons)
			return -1;
	ret = hyp_ring_cell(console->in, console->in_cons);
	mb();
	console->in_cons++;
	hyp_event_channel_send(boot_info.console_evtchn);
	return ret;
}

void cnpollc(boolean_t on) {
	if (on) {
		kd_pollc++;
	} else {
		--kd_pollc;
	}
}

void kd_setleds1(u_char val)
{
	/* Can't do this.  */
}

/* Mach part */

struct tty hypcn_tty;

static void hypcnintr(int unit, spl_t spl, void *ret_addr, void *regs) {
	struct tty *tp = &hypcn_tty;
	if (kd_pollc)
		return;
	simple_lock(&inlock);
	while (console->in_prod != console->in_cons) {
		int c = hyp_ring_cell(console->in, console->in_cons);
		mb();
		console->in_cons++;
#ifdef	MACH_KDB
		if (c == (char)'£')
			panic("£ pressed");
#endif	/* MACH_KDB */
		if ((tp->t_state & (TS_ISOPEN|TS_WOPEN)))
			(*linesw[tp->t_line].l_rint)(c, tp);
	}
	hyp_event_channel_send(boot_info.console_evtchn);
	simple_unlock(&inlock);
}

int hypcnread(int dev, io_req_t ior)
{
	struct tty *tp = &hypcn_tty;
	tp->t_state |= TS_CARR_ON;
	return char_read(tp, ior);
}

int hypcnwrite(int dev, io_req_t ior)
{
	return char_write(&hypcn_tty, ior);
}

void hypcnstart(struct tty *tp)
{
	spl_t	o_pri;
	int ch;
	unsigned char c;

	if (tp->t_state & TS_TTSTOP)
		return;
	while (1) {
		tp->t_state &= ~TS_BUSY;
		if (tp->t_state & TS_TTSTOP)
			break;
		if ((tp->t_outq.c_cc <= 0) || (ch = getc(&tp->t_outq)) == -1)
			break;
		c = ch;
		o_pri = splsoftclock();
		hypputc(c);
		splx(o_pri);
	}
	if (tp->t_outq.c_cc <= TTLOWAT(tp)) {
		tt_write_wakeup(tp);
	}
}

void hypcnstop()
{
}

io_return_t hypcngetstat(dev_t dev, int flavor, int *data, unsigned int *count)
{
	return tty_get_status(&hypcn_tty, flavor, data, count);
}

io_return_t hypcnsetstat(dev_t dev, int flavor, int *data, unsigned int count)
{
	return tty_set_status(&hypcn_tty, flavor, data, count);
}

int hypcnportdeath(dev_t dev, mach_port_t port)
{
	return tty_portdeath(&hypcn_tty, (ipc_port_t) port);
}

int hypcnopen(dev_t dev, int flag, io_req_t ior)
{
	struct tty 	*tp = &hypcn_tty;
	spl_t	o_pri;

	o_pri = spltty();
	simple_lock(&tp->t_lock);
	if (!(tp->t_state & (TS_ISOPEN|TS_WOPEN))) {
		/* XXX ttychars allocates memory */
		simple_unlock(&tp->t_lock);
		ttychars(tp);
		simple_lock(&tp->t_lock);
		tp->t_oproc = hypcnstart;
		tp->t_stop = hypcnstop;
		tp->t_ospeed = tp->t_ispeed = B9600;
		tp->t_flags = ODDP|EVENP|ECHO|CRMOD|XTABS;
	}
	tp->t_state |= TS_CARR_ON;
	simple_unlock(&tp->t_lock);
	splx(o_pri);
	return (char_open(dev, tp, flag, ior));
}

int hypcnclose(int dev, int flag)
{
	struct tty	*tp = &hypcn_tty;
	spl_t s = spltty();
	simple_lock(&tp->t_lock);
	ttyclose(tp);
	simple_unlock(&tp->t_lock);
	splx(s);
	return 0;
}

int hypcnprobe(struct consdev *cp)
{
	struct xencons_interface *my_console;
	my_console = (void*) mfn_to_kv(boot_info.console_mfn);

	cp->cn_dev = makedev(0, 0);
	cp->cn_pri = CN_INTERNAL;
	return 0;
}

int hypcninit(struct consdev *cp)
{
	if (console)
		return 0;
	simple_lock_init(&outlock);
	simple_lock_init(&inlock);
	console = (void*) mfn_to_kv(boot_info.console_mfn);
	pmap_set_page_readwrite(console);
	hyp_evt_handler(boot_info.console_evtchn, hypcnintr, 0, SPL6);
	return 0;
}