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/config.h>
14 #include <linux/types.h>
15 #include <linux/sched.h>
16 #include <linux/console.h>
17 #include <asm/processor.h>
19 void (*udbg_putc)(char c);
20 int (*udbg_getc)(void);
21 int (*udbg_getc_poll)(void);
23 /* udbg library, used by xmon et al */
24 void udbg_puts(const char *s)
29 if (s && *s != '\0') {
30 while ((c = *s++) != '\0')
41 int udbg_write(const char *s, int n)
49 if (s && *s != '\0') {
50 while (((c = *s++) != '\0') && (remain-- > 0)) {
58 int udbg_read(char *buf, int buflen)
66 for (i = 0; i < buflen; ++i) {
69 if (c == -1 && i == 0)
72 } while (c == 0x11 || c == 0x13);
73 if (c == 0 || c == -1)
81 #define UDBG_BUFSIZE 256
82 void udbg_printf(const char *fmt, ...)
84 char buf[UDBG_BUFSIZE];
88 vsnprintf(buf, UDBG_BUFSIZE, fmt, args);
93 void __init udbg_progress(char *s, unsigned short hex)
100 * Early boot console based on udbg
102 static void udbg_console_write(struct console *con, const char *s,
108 static struct console udbg_console = {
110 .write = udbg_console_write,
111 .flags = CON_PRINTBUFFER | CON_ENABLED,
115 static int early_console_initialized;
117 void __init disable_early_printk(void)
120 if (!early_console_initialized)
122 unregister_console(&udbg_console);
123 early_console_initialized = 0;
127 /* called by setup_system */
128 void register_early_udbg_console(void)
130 if (early_console_initialized)
132 early_console_initialized = 1;
133 register_console(&udbg_console);
136 #if 0 /* if you want to use this as a regular output console */
137 console_initcall(register_udbg_console);