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
|
/*
* polling mode stateless debugging stuff, originally for NS16550 Serial Ports
*
* c 2001 PPC 64 Team, IBM Corp
*
* 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.
*/
#include <stdarg.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/console.h>
#include <linux/init.h>
#include <asm/processor.h>
#include <asm/udbg.h>
void (*udbg_putc)(char c);
void (*udbg_flush)(void);
int (*udbg_getc)(void);
int (*udbg_getc_poll)(void);
/*
* Early debugging facilities. You can enable _one_ of these via .config,
* if you do so your kernel _will not boot_ on anything else. Be careful.
*/
void __init udbg_early_init(void)
{
#if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
/* For LPAR machines that have an HVC console on vterm 0 */
udbg_init_debug_lpar();
#elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
/* For use on Apple G5 machines */
udbg_init_pmac_realmode();
#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
/* RTAS panel debug */
udbg_init_rtas_panel();
#elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
/* RTAS console debug */
udbg_init_rtas_console();
#elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
/* Maple real mode debug */
udbg_init_maple_realmode();
#elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES)
/* For iSeries - hit Ctrl-x Ctrl-x to see the output */
udbg_init_iseries();
#elif defined(CONFIG_PPC_EARLY_DEBUG_BEAT)
udbg_init_debug_beat();
#elif defined(CONFIG_PPC_EARLY_DEBUG_PAS_REALMODE)
udbg_init_pas_realmode();
#elif defined(CONFIG_BOOTX_TEXT)
udbg_init_btext();
#elif defined(CONFIG_PPC_EARLY_DEBUG_44x)
/* PPC44x debug */
udbg_init_44x_as1();
#elif defined(CONFIG_PPC_EARLY_DEBUG_40x)
/* PPC40x debug */
udbg_init_40x_realmode();
#elif defined(CONFIG_PPC_EARLY_DEBUG_CPM)
udbg_init_cpm();
#endif
#ifdef CONFIG_PPC_EARLY_DEBUG
console_loglevel = 10;
#endif
}
/* udbg library, used by xmon et al */
void udbg_puts(const char *s)
{
if (udbg_putc) {
char c;
if (s && *s != '\0') {
while ((c = *s++) != '\0')
udbg_putc(c);
}
if (udbg_flush)
udbg_flush();
}
#if 0
else {
printk("%s", s);
}
#endif
}
int udbg_write(const char *s, int n)
{
int remain = n;
char c;
if (!udbg_putc)
return 0;
if (s && *s != '\0') {
while (((c = *s++) != '\0') && (remain-- > 0)) {
udbg_putc(c);
}
}
if (udbg_flush)
udbg_flush();
return n - remain;
}
int udbg_read(char *buf, int buflen)
{
char *p = buf;
int i, c;
if (!udbg_getc)
return 0;
for (i = 0; i < buflen; ++i) {
do {
c = udbg_getc();
if (c == -1 && i == 0)
return -1;
} while (c == 0x11 || c == 0x13);
if (c == 0 || c == -1)
break;
*p++ = c;
}
return i;
}
#define UDBG_BUFSIZE 256
void udbg_printf(const char *fmt, ...)
{
char buf[UDBG_BUFSIZE];
va_list args;
va_start(args, fmt);
vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
udbg_puts(buf);
va_end(args);
}
void __init udbg_progress(char *s, unsigned short hex)
{
udbg_puts(s);
udbg_puts("\n");
}
/*
* Early boot console based on udbg
*/
static void udbg_console_write(struct console *con, const char *s,
unsigned int n)
{
udbg_write(s, n);
}
static struct console udbg_console = {
.name = "udbg",
.write = udbg_console_write,
.flags = CON_PRINTBUFFER | CON_ENABLED | CON_BOOT | CON_ANYTIME,
.index = 0,
};
static int early_console_initialized;
/*
* Called by setup_system after ppc_md->probe and ppc_md->early_init.
* Call it again after setting udbg_putc in ppc_md->setup_arch.
*/
void __init register_early_udbg_console(void)
{
if (early_console_initialized)
return;
if (!udbg_putc)
return;
if (strstr(boot_command_line, "udbg-immortal")) {
printk(KERN_INFO "early console immortal !\n");
udbg_console.flags &= ~CON_BOOT;
}
early_console_initialized = 1;
register_console(&udbg_console);
}
#if 0 /* if you want to use this as a regular output console */
console_initcall(register_udbg_console);
#endif
|
