Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
7f853352 | 2 | * polling mode stateless debugging stuff, originally for NS16550 Serial Ports |
1da177e4 LT |
3 | * |
4 | * c 2001 PPC 64 Team, IBM Corp | |
5 | * | |
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. | |
10 | */ | |
11 | ||
12 | #include <stdarg.h> | |
1da177e4 LT |
13 | #include <linux/config.h> |
14 | #include <linux/types.h> | |
188d2ce7 | 15 | #include <linux/sched.h> |
8d927391 | 16 | #include <linux/console.h> |
1da177e4 | 17 | #include <asm/processor.h> |
1da177e4 | 18 | |
51d3082f BH |
19 | void (*udbg_putc)(char c); |
20 | char (*udbg_getc)(void); | |
c8f1c8be MM |
21 | int (*udbg_getc_poll)(void); |
22 | ||
8d927391 | 23 | /* udbg library, used by xmon et al */ |
1da177e4 LT |
24 | void udbg_puts(const char *s) |
25 | { | |
c8f1c8be | 26 | if (udbg_putc) { |
1da177e4 LT |
27 | char c; |
28 | ||
29 | if (s && *s != '\0') { | |
30 | while ((c = *s++) != '\0') | |
c8f1c8be | 31 | udbg_putc(c); |
1da177e4 LT |
32 | } |
33 | } | |
34 | #if 0 | |
35 | else { | |
36 | printk("%s", s); | |
37 | } | |
38 | #endif | |
39 | } | |
40 | ||
41 | int udbg_write(const char *s, int n) | |
42 | { | |
43 | int remain = n; | |
44 | char c; | |
45 | ||
c8f1c8be | 46 | if (!udbg_putc) |
1da177e4 LT |
47 | return 0; |
48 | ||
49 | if (s && *s != '\0') { | |
50 | while (((c = *s++) != '\0') && (remain-- > 0)) { | |
c8f1c8be | 51 | udbg_putc(c); |
1da177e4 LT |
52 | } |
53 | } | |
54 | ||
55 | return n - remain; | |
56 | } | |
57 | ||
58 | int udbg_read(char *buf, int buflen) | |
59 | { | |
60 | char c, *p = buf; | |
61 | int i; | |
62 | ||
c8f1c8be | 63 | if (!udbg_getc) |
1da177e4 LT |
64 | return 0; |
65 | ||
66 | for (i = 0; i < buflen; ++i) { | |
67 | do { | |
c8f1c8be | 68 | c = udbg_getc(); |
1da177e4 LT |
69 | } while (c == 0x11 || c == 0x13); |
70 | if (c == 0) | |
71 | break; | |
72 | *p++ = c; | |
73 | } | |
74 | ||
75 | return i; | |
76 | } | |
77 | ||
1da177e4 LT |
78 | #define UDBG_BUFSIZE 256 |
79 | void udbg_printf(const char *fmt, ...) | |
80 | { | |
51d3082f | 81 | char buf[UDBG_BUFSIZE]; |
1da177e4 LT |
82 | va_list args; |
83 | ||
84 | va_start(args, fmt); | |
85 | vsnprintf(buf, UDBG_BUFSIZE, fmt, args); | |
86 | udbg_puts(buf); | |
87 | va_end(args); | |
88 | } | |
89 | ||
8d927391 MM |
90 | /* |
91 | * Early boot console based on udbg | |
92 | */ | |
93 | static void udbg_console_write(struct console *con, const char *s, | |
94 | unsigned int n) | |
95 | { | |
96 | udbg_write(s, n); | |
97 | } | |
98 | ||
99 | static struct console udbg_console = { | |
100 | .name = "udbg", | |
101 | .write = udbg_console_write, | |
463ce0e1 | 102 | .flags = CON_PRINTBUFFER | CON_ENABLED, |
8d927391 MM |
103 | .index = -1, |
104 | }; | |
105 | ||
38c0ff06 SR |
106 | static int early_console_initialized; |
107 | ||
8d927391 MM |
108 | void __init disable_early_printk(void) |
109 | { | |
38c0ff06 SR |
110 | if (!early_console_initialized) |
111 | return; | |
8d927391 | 112 | unregister_console(&udbg_console); |
38c0ff06 | 113 | early_console_initialized = 0; |
8d927391 MM |
114 | } |
115 | ||
116 | /* called by setup_system */ | |
117 | void register_early_udbg_console(void) | |
118 | { | |
51d3082f BH |
119 | if (early_console_initialized) |
120 | return; | |
38c0ff06 | 121 | early_console_initialized = 1; |
8d927391 MM |
122 | register_console(&udbg_console); |
123 | } | |
124 | ||
125 | #if 0 /* if you want to use this as a regular output console */ | |
126 | console_initcall(register_udbg_console); | |
127 | #endif |