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| Rev | Author | Line No. | Line |
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| 510 | jermar | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2003 Josef Cejka |
| 3 | * Copyright (c) 2005 Jakub Jermar |
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| 510 | jermar | 4 | * All rights reserved. |
| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * |
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| 10 | * - Redistributions of source code must retain the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer. |
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| 12 | * - Redistributions in binary form must reproduce the above copyright |
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| 13 | * notice, this list of conditions and the following disclaimer in the |
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| 14 | * documentation and/or other materials provided with the distribution. |
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| 15 | * - The name of the author may not be used to endorse or promote products |
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| 16 | * derived from this software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |||
| 1888 | jermar | 30 | /** @addtogroup genericconsole |
| 1702 | cejka | 31 | * @{ |
| 32 | */ |
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| 33 | /** @file |
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| 34 | */ |
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| 35 | |||
| 510 | jermar | 36 | #include <console/console.h> |
| 37 | #include <console/chardev.h> |
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| 38 | #include <synch/waitq.h> |
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| 39 | #include <synch/spinlock.h> |
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| 40 | #include <arch/types.h> |
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| 41 | #include <arch.h> |
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| 607 | palkovsky | 42 | #include <func.h> |
| 43 | #include <print.h> |
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| 1104 | jermar | 44 | #include <atomic.h> |
| 510 | jermar | 45 | |
| 3065 | decky | 46 | #define KLOG_SIZE 4096 |
| 1050 | palkovsky | 47 | |
| 3065 | decky | 48 | /**< Kernel log cyclic buffer */ |
| 49 | static char klog[KLOG_SIZE]; |
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| 50 | |||
| 51 | /**< First kernel log characters */ |
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| 52 | static index_t klog_start = 0; |
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| 53 | /**< Number of valid kernel log characters */ |
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| 54 | static size_t klog_len = 0; |
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| 55 | /**< Number of stored (not printed) kernel log characters */ |
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| 56 | static size_t klog_stored = 0; |
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| 57 | |||
| 1050 | palkovsky | 58 | static chardev_operations_t null_stdout_ops = { |
| 3065 | decky | 59 | .suspend = NULL, |
| 60 | .resume = NULL, |
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| 61 | .write = NULL, |
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| 62 | .read = NULL |
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| 1050 | palkovsky | 63 | }; |
| 2697 | decky | 64 | |
| 1050 | palkovsky | 65 | chardev_t null_stdout = { |
| 66 | .name = "null", |
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| 67 | .op = &null_stdout_ops |
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| 68 | }; |
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| 69 | |||
| 510 | jermar | 70 | /** Standard input character device. */ |
| 71 | chardev_t *stdin = NULL; |
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| 1050 | palkovsky | 72 | chardev_t *stdout = &null_stdout; |
| 510 | jermar | 73 | |
| 601 | palkovsky | 74 | /** Get character from character device. Do not echo character. |
| 588 | palkovsky | 75 | * |
| 76 | * @param chardev Character device. |
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| 77 | * |
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| 78 | * @return Character read. |
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| 79 | */ |
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| 1780 | jermar | 80 | uint8_t _getc(chardev_t *chardev) |
| 588 | palkovsky | 81 | { |
| 1780 | jermar | 82 | uint8_t ch; |
| 588 | palkovsky | 83 | ipl_t ipl; |
| 84 | |||
| 631 | palkovsky | 85 | if (atomic_get(&haltstate)) { |
| 607 | palkovsky | 86 | /* If we are here, we are hopefully on the processor, that |
| 87 | * issued the 'halt' command, so proceed to read the character |
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| 88 | * directly from input |
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| 89 | */ |
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| 90 | if (chardev->op->read) |
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| 91 | return chardev->op->read(chardev); |
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| 92 | /* no other way of interacting with user, halt */ |
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| 631 | palkovsky | 93 | if (CPU) |
| 3065 | decky | 94 | printf("cpu%u: ", CPU->id); |
| 631 | palkovsky | 95 | else |
| 96 | printf("cpu: "); |
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| 97 | printf("halted - no kconsole\n"); |
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| 607 | palkovsky | 98 | cpu_halt(); |
| 99 | } |
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| 100 | |||
| 588 | palkovsky | 101 | waitq_sleep(&chardev->wq); |
| 102 | ipl = interrupts_disable(); |
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| 103 | spinlock_lock(&chardev->lock); |
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| 104 | ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
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| 105 | chardev->counter--; |
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| 106 | spinlock_unlock(&chardev->lock); |
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| 107 | interrupts_restore(ipl); |
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| 108 | |||
| 109 | chardev->op->resume(chardev); |
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| 110 | |||
| 111 | return ch; |
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| 112 | } |
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| 113 | |||
| 510 | jermar | 114 | /** Get string from character device. |
| 115 | * |
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| 116 | * Read characters from character device until first occurrence |
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| 117 | * of newline character. |
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| 118 | * |
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| 119 | * @param chardev Character device. |
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| 517 | jermar | 120 | * @param buf Buffer where to store string terminated by '\0'. |
| 1708 | jermar | 121 | * @param buflen Size of the buffer. |
| 517 | jermar | 122 | * |
| 123 | * @return Number of characters read. |
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| 510 | jermar | 124 | */ |
| 517 | jermar | 125 | count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
| 510 | jermar | 126 | { |
| 127 | index_t index = 0; |
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| 128 | char ch; |
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| 129 | |||
| 130 | while (index < buflen) { |
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| 588 | palkovsky | 131 | ch = _getc(chardev); |
| 132 | if (ch == '\b') { |
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| 133 | if (index > 0) { |
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| 134 | index--; |
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| 135 | /* Space backspace, space */ |
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| 136 | putchar('\b'); |
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| 137 | putchar(' '); |
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| 138 | putchar('\b'); |
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| 139 | } |
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| 140 | continue; |
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| 141 | } |
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| 142 | putchar(ch); |
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| 143 | |||
| 510 | jermar | 144 | if (ch == '\n') { /* end of string => write 0, return */ |
| 517 | jermar | 145 | buf[index] = '\0'; |
| 146 | return (count_t) index; |
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| 510 | jermar | 147 | } |
| 517 | jermar | 148 | buf[index++] = ch; |
| 510 | jermar | 149 | } |
| 517 | jermar | 150 | return (count_t) index; |
| 510 | jermar | 151 | } |
| 152 | |||
| 588 | palkovsky | 153 | /** Get character from device & echo it to screen */ |
| 1780 | jermar | 154 | uint8_t getc(chardev_t *chardev) |
| 510 | jermar | 155 | { |
| 1780 | jermar | 156 | uint8_t ch; |
| 510 | jermar | 157 | |
| 588 | palkovsky | 158 | ch = _getc(chardev); |
| 159 | putchar(ch); |
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| 510 | jermar | 160 | return ch; |
| 161 | } |
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| 575 | palkovsky | 162 | |
| 163 | void putchar(char c) |
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| 164 | { |
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| 3065 | decky | 165 | if ((klog_stored > 0) && (stdout->op->write)) { |
| 166 | /* Print charaters stored in kernel log */ |
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| 167 | index_t i; |
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| 168 | for (i = klog_len - klog_stored; i < klog_len; i++) |
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| 169 | stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE]); |
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| 170 | klog_stored = 0; |
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| 171 | } |
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| 172 | |||
| 173 | /* Store character in the cyclic kernel log */ |
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| 174 | klog[(klog_start + klog_len) % KLOG_SIZE] = c; |
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| 175 | if (klog_len < KLOG_SIZE) |
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| 176 | klog_len++; |
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| 177 | else |
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| 178 | klog_start = (klog_start + 1) % KLOG_SIZE; |
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| 179 | |||
| 607 | palkovsky | 180 | if (stdout->op->write) |
| 181 | stdout->op->write(stdout, c); |
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| 3065 | decky | 182 | else { |
| 183 | /* The character is just in the kernel log */ |
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| 184 | if (klog_stored < klog_len) |
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| 185 | klog_stored++; |
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| 186 | } |
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| 575 | palkovsky | 187 | } |
| 1702 | cejka | 188 | |
| 1888 | jermar | 189 | /** @} |
| 1702 | cejka | 190 | */ |