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| Rev 2927 | Rev 3149 | ||
|---|---|---|---|
| Line 41... | Line 41... | ||
| 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 |
| Line 88... | Line 89... | ||
| 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 | } |
| Line 159... | Line 160... | ||
| 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 | */ |