| 0,0 → 1,170 |
|---|
| /* |
| * Copyright (C) 2003 Josef Cejka |
| * Copyright (C) 2005 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** @addtogroup genericconsole |
| * @{ |
| */ |
| /** @file |
| */ |
| |
| #include <console/console.h> |
| #include <console/chardev.h> |
| #include <synch/waitq.h> |
| #include <synch/spinlock.h> |
| #include <arch/types.h> |
| #include <typedefs.h> |
| #include <arch.h> |
| #include <func.h> |
| #include <print.h> |
| #include <atomic.h> |
| |
| #define BUFLEN 2048 |
| static char debug_buffer[BUFLEN]; |
| static size_t offset = 0; |
| /** Initialize stdout to something that does not print, but does not fail |
| * |
| * Save data in some buffer so that it could be retrieved in the debugger |
| */ |
| static void null_putchar(chardev_t *d, const char ch) |
| { |
| if (offset >= BUFLEN) |
| offset = 0; |
| debug_buffer[offset++] = ch; |
| } |
| |
| static chardev_operations_t null_stdout_ops = { |
| .write = null_putchar |
| }; |
| chardev_t null_stdout = { |
| .name = "null", |
| .op = &null_stdout_ops |
| }; |
| |
| /** Standard input character device. */ |
| chardev_t *stdin = NULL; |
| chardev_t *stdout = &null_stdout; |
| |
| /** Get character from character device. Do not echo character. |
| * |
| * @param chardev Character device. |
| * |
| * @return Character read. |
| */ |
| uint8_t _getc(chardev_t *chardev) |
| { |
| uint8_t ch; |
| ipl_t ipl; |
| |
| if (atomic_get(&haltstate)) { |
| /* If we are here, we are hopefully on the processor, that |
| * issued the 'halt' command, so proceed to read the character |
| * directly from input |
| */ |
| if (chardev->op->read) |
| return chardev->op->read(chardev); |
| /* no other way of interacting with user, halt */ |
| if (CPU) |
| printf("cpu%d: ", CPU->id); |
| else |
| printf("cpu: "); |
| printf("halted - no kconsole\n"); |
| cpu_halt(); |
| } |
| |
| waitq_sleep(&chardev->wq); |
| ipl = interrupts_disable(); |
| spinlock_lock(&chardev->lock); |
| ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN]; |
| chardev->counter--; |
| spinlock_unlock(&chardev->lock); |
| interrupts_restore(ipl); |
| |
| chardev->op->resume(chardev); |
| |
| return ch; |
| } |
| |
| /** Get string from character device. |
| * |
| * Read characters from character device until first occurrence |
| * of newline character. |
| * |
| * @param chardev Character device. |
| * @param buf Buffer where to store string terminated by '\0'. |
| * @param buflen Size of the buffer. |
| * |
| * @return Number of characters read. |
| */ |
| count_t gets(chardev_t *chardev, char *buf, size_t buflen) |
| { |
| index_t index = 0; |
| char ch; |
| |
| while (index < buflen) { |
| ch = _getc(chardev); |
| if (ch == '\b') { |
| if (index > 0) { |
| index--; |
| /* Space backspace, space */ |
| putchar('\b'); |
| putchar(' '); |
| putchar('\b'); |
| } |
| continue; |
| } |
| putchar(ch); |
| |
| if (ch == '\n') { /* end of string => write 0, return */ |
| buf[index] = '\0'; |
| return (count_t) index; |
| } |
| buf[index++] = ch; |
| } |
| return (count_t) index; |
| } |
| |
| /** Get character from device & echo it to screen */ |
| uint8_t getc(chardev_t *chardev) |
| { |
| uint8_t ch; |
| |
| ch = _getc(chardev); |
| putchar(ch); |
| return ch; |
| } |
| |
| void putchar(char c) |
| { |
| if (stdout->op->write) |
| stdout->op->write(stdout, c); |
| } |
| |
| /** @} |
| */ |
| |