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/*
* 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.
*/
#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.
*/
__u8 _getc(chardev_t *chardev)
{
__u8 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 len 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 */
__u8 getc(chardev_t *chardev)
{
__u8 ch;
ch = _getc(chardev);
putchar(ch);
return ch;
}
void putchar(char c)
{
if (stdout->op->write)
stdout->op->write(stdout, c);
}