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1 | /* |
1 | /* |
2 | * Copyright (c) 2003 Josef Cejka |
2 | * Copyright (c) 2003 Josef Cejka |
3 | * Copyright (c) 2005 Jakub Jermar |
3 | * Copyright (c) 2005 Jakub Jermar |
4 | * All rights reserved. |
4 | * All rights reserved. |
5 | * |
5 | * |
6 | * Redistribution and use in source and binary forms, with or without |
6 | * Redistribution and use in source and binary forms, with or without |
7 | * modification, are permitted provided that the following conditions |
7 | * modification, are permitted provided that the following conditions |
8 | * are met: |
8 | * are met: |
9 | * |
9 | * |
10 | * - Redistributions of source code must retain the above copyright |
10 | * - Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * - Redistributions in binary form must reproduce the above copyright |
12 | * - Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
14 | * documentation and/or other materials provided with the distribution. |
15 | * - The name of the author may not be used to endorse or promote products |
15 | * - The name of the author may not be used to endorse or promote products |
16 | * derived from this software without specific prior written permission. |
16 | * derived from this software without specific prior written permission. |
17 | * |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | */ |
28 | */ |
29 | 29 | ||
30 | /** @addtogroup genericconsole |
30 | /** @addtogroup genericconsole |
31 | * @{ |
31 | * @{ |
32 | */ |
32 | */ |
33 | /** @file |
33 | /** @file |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <console/console.h> |
36 | #include <console/console.h> |
37 | #include <console/chardev.h> |
37 | #include <console/chardev.h> |
38 | #include <synch/waitq.h> |
38 | #include <synch/waitq.h> |
39 | #include <synch/spinlock.h> |
39 | #include <synch/spinlock.h> |
40 | #include <arch/types.h> |
40 | #include <arch/types.h> |
41 | #include <arch.h> |
41 | #include <arch.h> |
42 | #include <func.h> |
42 | #include <func.h> |
43 | #include <print.h> |
43 | #include <print.h> |
44 | #include <atomic.h> |
44 | #include <atomic.h> |
45 | 45 | ||
46 | #define BUFLEN 2048 |
46 | #define KLOG_SIZE 4096 |
- | 47 | ||
47 | static char debug_buffer[BUFLEN]; |
48 | /**< Kernel log cyclic buffer */ |
48 | static size_t offset = 0; |
49 | static char klog[KLOG_SIZE]; |
49 | /** Initialize stdout to something that does not print, but does not fail |
- | |
50 | * |
50 | |
51 | * Save data in some buffer so that it could be retrieved in the debugger |
51 | /**< First kernel log characters */ |
52 | */ |
- | |
53 | static void null_putchar(chardev_t *d, const char ch) |
52 | static index_t klog_start = 0; |
54 | { |
- | |
55 | if (offset >= BUFLEN) |
53 | /**< Number of valid kernel log characters */ |
56 | offset = 0; |
54 | static size_t klog_len = 0; |
- | 55 | /**< Number of stored (not printed) kernel log characters */ |
|
57 | debug_buffer[offset++] = ch; |
56 | static size_t klog_stored = 0; |
58 | } |
- | |
59 | 57 | ||
60 | static chardev_operations_t null_stdout_ops = { |
58 | static chardev_operations_t null_stdout_ops = { |
- | 59 | .suspend = NULL, |
|
- | 60 | .resume = NULL, |
|
61 | .write = null_putchar |
61 | .write = NULL, |
- | 62 | .read = NULL |
|
62 | }; |
63 | }; |
63 | 64 | ||
64 | chardev_t null_stdout = { |
65 | chardev_t null_stdout = { |
65 | .name = "null", |
66 | .name = "null", |
66 | .op = &null_stdout_ops |
67 | .op = &null_stdout_ops |
67 | }; |
68 | }; |
68 | 69 | ||
69 | /** Standard input character device. */ |
70 | /** Standard input character device. */ |
70 | chardev_t *stdin = NULL; |
71 | chardev_t *stdin = NULL; |
71 | chardev_t *stdout = &null_stdout; |
72 | chardev_t *stdout = &null_stdout; |
72 | 73 | ||
73 | /** Get character from character device. Do not echo character. |
74 | /** Get character from character device. Do not echo character. |
74 | * |
75 | * |
75 | * @param chardev Character device. |
76 | * @param chardev Character device. |
76 | * |
77 | * |
77 | * @return Character read. |
78 | * @return Character read. |
78 | */ |
79 | */ |
79 | uint8_t _getc(chardev_t *chardev) |
80 | uint8_t _getc(chardev_t *chardev) |
80 | { |
81 | { |
81 | uint8_t ch; |
82 | uint8_t ch; |
82 | ipl_t ipl; |
83 | ipl_t ipl; |
83 | 84 | ||
84 | if (atomic_get(&haltstate)) { |
85 | if (atomic_get(&haltstate)) { |
85 | /* If we are here, we are hopefully on the processor, that |
86 | /* If we are here, we are hopefully on the processor, that |
86 | * issued the 'halt' command, so proceed to read the character |
87 | * issued the 'halt' command, so proceed to read the character |
87 | * directly from input |
88 | * directly from input |
88 | */ |
89 | */ |
89 | if (chardev->op->read) |
90 | if (chardev->op->read) |
90 | return chardev->op->read(chardev); |
91 | return chardev->op->read(chardev); |
91 | /* no other way of interacting with user, halt */ |
92 | /* no other way of interacting with user, halt */ |
92 | if (CPU) |
93 | if (CPU) |
93 | printf("cpu%d: ", CPU->id); |
94 | printf("cpu%u: ", CPU->id); |
94 | else |
95 | else |
95 | printf("cpu: "); |
96 | printf("cpu: "); |
96 | printf("halted - no kconsole\n"); |
97 | printf("halted - no kconsole\n"); |
97 | cpu_halt(); |
98 | cpu_halt(); |
98 | } |
99 | } |
99 | 100 | ||
100 | waitq_sleep(&chardev->wq); |
101 | waitq_sleep(&chardev->wq); |
101 | ipl = interrupts_disable(); |
102 | ipl = interrupts_disable(); |
102 | spinlock_lock(&chardev->lock); |
103 | spinlock_lock(&chardev->lock); |
103 | ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
104 | ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
104 | chardev->counter--; |
105 | chardev->counter--; |
105 | spinlock_unlock(&chardev->lock); |
106 | spinlock_unlock(&chardev->lock); |
106 | interrupts_restore(ipl); |
107 | interrupts_restore(ipl); |
107 | 108 | ||
108 | chardev->op->resume(chardev); |
109 | chardev->op->resume(chardev); |
109 | 110 | ||
110 | return ch; |
111 | return ch; |
111 | } |
112 | } |
112 | 113 | ||
113 | /** Get string from character device. |
114 | /** Get string from character device. |
114 | * |
115 | * |
115 | * Read characters from character device until first occurrence |
116 | * Read characters from character device until first occurrence |
116 | * of newline character. |
117 | * of newline character. |
117 | * |
118 | * |
118 | * @param chardev Character device. |
119 | * @param chardev Character device. |
119 | * @param buf Buffer where to store string terminated by '\0'. |
120 | * @param buf Buffer where to store string terminated by '\0'. |
120 | * @param buflen Size of the buffer. |
121 | * @param buflen Size of the buffer. |
121 | * |
122 | * |
122 | * @return Number of characters read. |
123 | * @return Number of characters read. |
123 | */ |
124 | */ |
124 | count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
125 | count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
125 | { |
126 | { |
126 | index_t index = 0; |
127 | index_t index = 0; |
127 | char ch; |
128 | char ch; |
128 | 129 | ||
129 | while (index < buflen) { |
130 | while (index < buflen) { |
130 | ch = _getc(chardev); |
131 | ch = _getc(chardev); |
131 | if (ch == '\b') { |
132 | if (ch == '\b') { |
132 | if (index > 0) { |
133 | if (index > 0) { |
133 | index--; |
134 | index--; |
134 | /* Space backspace, space */ |
135 | /* Space backspace, space */ |
135 | putchar('\b'); |
136 | putchar('\b'); |
136 | putchar(' '); |
137 | putchar(' '); |
137 | putchar('\b'); |
138 | putchar('\b'); |
138 | } |
139 | } |
139 | continue; |
140 | continue; |
140 | } |
141 | } |
141 | putchar(ch); |
142 | putchar(ch); |
142 | 143 | ||
143 | if (ch == '\n') { /* end of string => write 0, return */ |
144 | if (ch == '\n') { /* end of string => write 0, return */ |
144 | buf[index] = '\0'; |
145 | buf[index] = '\0'; |
145 | return (count_t) index; |
146 | return (count_t) index; |
146 | } |
147 | } |
147 | buf[index++] = ch; |
148 | buf[index++] = ch; |
148 | } |
149 | } |
149 | return (count_t) index; |
150 | return (count_t) index; |
150 | } |
151 | } |
151 | 152 | ||
152 | /** Get character from device & echo it to screen */ |
153 | /** Get character from device & echo it to screen */ |
153 | uint8_t getc(chardev_t *chardev) |
154 | uint8_t getc(chardev_t *chardev) |
154 | { |
155 | { |
155 | uint8_t ch; |
156 | uint8_t ch; |
156 | 157 | ||
157 | ch = _getc(chardev); |
158 | ch = _getc(chardev); |
158 | putchar(ch); |
159 | putchar(ch); |
159 | return ch; |
160 | return ch; |
160 | } |
161 | } |
161 | 162 | ||
162 | void putchar(char c) |
163 | void putchar(char c) |
163 | { |
164 | { |
- | 165 | if ((klog_stored > 0) && (stdout->op->write)) { |
|
- | 166 | /* Print charaters stored in kernel log */ |
|
- | 167 | index_t i; |
|
- | 168 | for (i = klog_len - klog_stored; i < klog_len; i++) |
|
- | 169 | stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]); |
|
- | 170 | klog_stored = 0; |
|
- | 171 | } |
|
- | 172 | ||
- | 173 | /* Store character in the cyclic kernel log */ |
|
- | 174 | klog[(klog_start + klog_len) % KLOG_SIZE] = c; |
|
- | 175 | if (klog_len < KLOG_SIZE) |
|
- | 176 | klog_len++; |
|
- | 177 | else |
|
- | 178 | klog_start = (klog_start + 1) % KLOG_SIZE; |
|
- | 179 | ||
164 | if (stdout->op->write) |
180 | if (stdout->op->write) |
165 | stdout->op->write(stdout, c); |
181 | stdout->op->write(stdout, c); |
- | 182 | else { |
|
- | 183 | /* The character is just in the kernel log */ |
|
- | 184 | if (klog_stored < klog_len) |
|
- | 185 | klog_stored++; |
|
- | 186 | } |
|
166 | } |
187 | } |
167 | 188 | ||
168 | /** @} |
189 | /** @} |
169 | */ |
190 | */ |
170 | 191 |