2 * polling mode stateless debugging stuff, originally for NS16550 Serial Ports
4 * c 2001 PPC 64 Team, IBM Corp
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
13 #include <linux/types.h>
14 #include <linux/sched.h>
15 #include <linux/console.h>
16 #include <linux/init.h>
17 #include <asm/processor.h>
20 void (*udbg_putc
)(char c
);
21 int (*udbg_getc
)(void);
22 int (*udbg_getc_poll
)(void);
25 * Early debugging facilities. You can enable _one_ of these via .config,
26 * if you do so your kernel _will not boot_ on anything else. Be careful.
28 void __init
udbg_early_init(void)
30 #if defined(CONFIG_PPC_EARLY_DEBUG_LPAR)
31 /* For LPAR machines that have an HVC console on vterm 0 */
32 udbg_init_debug_lpar();
33 #elif defined(CONFIG_PPC_EARLY_DEBUG_G5)
34 /* For use on Apple G5 machines */
35 udbg_init_pmac_realmode();
36 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_PANEL)
37 /* RTAS panel debug */
38 udbg_init_rtas_panel();
39 #elif defined(CONFIG_PPC_EARLY_DEBUG_RTAS_CONSOLE)
40 /* RTAS console debug */
41 udbg_init_rtas_console();
42 #elif defined(CONFIG_PPC_EARLY_DEBUG_MAPLE)
43 /* Maple real mode debug */
44 udbg_init_maple_realmode();
45 #elif defined(CONFIG_PPC_EARLY_DEBUG_ISERIES)
46 /* For iSeries - hit Ctrl-x Ctrl-x to see the output */
51 /* udbg library, used by xmon et al */
52 void udbg_puts(const char *s
)
57 if (s
&& *s
!= '\0') {
58 while ((c
= *s
++) != '\0')
69 int udbg_write(const char *s
, int n
)
77 if (s
&& *s
!= '\0') {
78 while (((c
= *s
++) != '\0') && (remain
-- > 0)) {
86 int udbg_read(char *buf
, int buflen
)
94 for (i
= 0; i
< buflen
; ++i
) {
97 if (c
== -1 && i
== 0)
100 } while (c
== 0x11 || c
== 0x13);
101 if (c
== 0 || c
== -1)
109 #define UDBG_BUFSIZE 256
110 void udbg_printf(const char *fmt
, ...)
112 char buf
[UDBG_BUFSIZE
];
116 vsnprintf(buf
, UDBG_BUFSIZE
, fmt
, args
);
121 void __init
udbg_progress(char *s
, unsigned short hex
)
128 * Early boot console based on udbg
130 static void udbg_console_write(struct console
*con
, const char *s
,
136 static struct console udbg_console
= {
138 .write
= udbg_console_write
,
139 .flags
= CON_PRINTBUFFER
| CON_ENABLED
,
143 static int early_console_initialized
;
145 void __init
disable_early_printk(void)
147 if (!early_console_initialized
)
149 if (strstr(saved_command_line
, "udbg-immortal")) {
150 printk(KERN_INFO
"early console immortal !\n");
153 unregister_console(&udbg_console
);
154 early_console_initialized
= 0;
157 /* called by setup_system */
158 void register_early_udbg_console(void)
160 if (early_console_initialized
)
162 early_console_initialized
= 1;
163 register_console(&udbg_console
);
166 #if 0 /* if you want to use this as a regular output console */
167 console_initcall(register_udbg_console
);