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
|
/*
* PDC Console support - ie use firmware to dump text via boot console
*
* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
* Copyright (C) 2000 Martin K Petersen <mkp at mkp.net>
* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
* Copyright (C) 2000 Philipp Rumpf <prumpf with tux.org>
* Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
* Copyright (C) 2000 Grant Grundler <grundler with parisc-linux.org>
* Copyright (C) 2001-2002 Ryan Bradetich <rbrad at parisc-linux.org>
* Copyright (C) 2001 Helge Deller <deller at parisc-linux.org>
* Copyright (C) 2001 Thomas Bogendoerfer <tsbogend at parisc-linux.org>
* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* The PDC console is a simple console, which can be used for debugging
* boot related problems on HP PA-RISC machines.
*
* This code uses the ROM (=PDC) based functions to read and write characters
* from and to PDC's boot path.
* Since all character read from that path must be polled, this code never
* can or will be a fully functional linux console.
*/
/* Define EARLY_BOOTUP_DEBUG to debug kernel related boot problems.
* On production kernels EARLY_BOOTUP_DEBUG should be undefined. */
#define EARLY_BOOTUP_DEBUG
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/major.h>
#include <linux/tty.h>
#include <asm/pdc.h> /* for iodc_call() proto and friends */
static void pdc_console_write(struct console *co, const char *s, unsigned count)
{
pdc_iodc_print(s, count);
}
void pdc_printf(const char *fmt, ...)
{
va_list args;
char buf[1024];
int i, len;
va_start(args, fmt);
len = vscnprintf(buf, sizeof(buf), fmt, args);
va_end(args);
pdc_iodc_print(buf, len);
}
int pdc_console_poll_key(struct console *co)
{
return pdc_iodc_getc();
}
static int pdc_console_setup(struct console *co, char *options)
{
return 0;
}
#if defined(CONFIG_PDC_CONSOLE)
#include <linux/vt_kern.h>
static struct tty_driver * pdc_console_device (struct console *c, int *index)
{
extern struct tty_driver console_driver;
*index = c->index ? c->index-1 : fg_console;
return &console_driver;
}
#else
#define pdc_console_device NULL
#endif
static struct console pdc_cons = {
.name = "ttyB",
.write = pdc_console_write,
.device = pdc_console_device,
.setup = pdc_console_setup,
.flags = CON_BOOT | CON_PRINTBUFFER | CON_ENABLED,
.index = -1,
};
static int pdc_console_initialized;
static void pdc_console_init_force(void)
{
if (pdc_console_initialized)
return;
++pdc_console_initialized;
/* If the console is duplex then copy the COUT parameters to CIN. */
if (PAGE0->mem_cons.cl_class == CL_DUPLEX)
memcpy(&PAGE0->mem_kbd, &PAGE0->mem_cons, sizeof(PAGE0->mem_cons));
/* register the pdc console */
register_console(&pdc_cons);
}
void __init pdc_console_init(void)
{
#if defined(EARLY_BOOTUP_DEBUG) || defined(CONFIG_PDC_CONSOLE)
pdc_console_init_force();
#endif
#ifdef EARLY_BOOTUP_DEBUG
printk(KERN_INFO "Initialized PDC Console for debugging.\n");
#endif
}
/*
* Used for emergencies. Currently only used if an HPMC occurs. If an
* HPMC occurs, it is possible that the current console may not be
* properly initialised after the PDC IO reset. This routine unregisters
* all of the current consoles, reinitializes the pdc console and
* registers it.
*/
void pdc_console_restart(void)
{
struct console *console;
if (pdc_console_initialized)
return;
/* If we've already seen the output, don't bother to print it again */
if (console_drivers != NULL)
pdc_cons.flags &= ~CON_PRINTBUFFER;
while ((console = console_drivers) != NULL)
unregister_console(console_drivers);
/* force registering the pdc console */
pdc_console_init_force();
}
|
