/************************************************************
* up_devconsole.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. Neither the name Gregory Nutt nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
************************************************************/
#if !defined(linux) && !defined(__CYGWIN__)
# error "Sorry, this will only work with Linux"
#else
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdio.h>
#include <errno.h>
#include <nuttx/fs.h>
#include "up_internal.h"
/************************************************************
* Definitions
************************************************************/
#define READ 3
#define WRITE 4
/************************************************************
* Private Function Prototypes
************************************************************/
static ssize_t devconsole_read(struct file *, char *, size_t);
static ssize_t devconsole_write(struct file *, const char *, size_t);
/************************************************************
* Private Data
************************************************************/
static struct file_operations devconsole_fops =
{
.read = devconsole_read,
.write = devconsole_write,
};
/************************************************************
* Private Functions
************************************************************/
static inline int up_read(int fd, void* buf, size_t count)
{
uint32 result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (READ), "b" ((uint32)(fd)), "c" ((uint32)(buf)), "d" ((uint32)(count)) \
: "memory");
return (int)result;
}
static inline int up_write(int fd, const void* buf, size_t count)
{
uint32 result;
__asm__ volatile ("int $0x80" \
: "=a" (result) \
: "0" (WRITE), "b" ((uint32)(fd)), "c" ((uint32)(buf)), "d" ((uint32)(count)) \
: "memory");
return (int)result;
}
static inline int up_check_result(int result)
{
if (result >= (uint32)(-(128 + 1)))
{
*get_errno_ptr() = -result;
result = ERROR;
}
return result;
}
static ssize_t devconsole_read(struct file *filp, char *buffer, size_t len)
{
return up_check_result(up_read(1, buffer, len));
}
static ssize_t devconsole_write(struct file *filp, const char *buffer, size_t len)
{
return up_check_result(up_write(1, buffer, len));
}
/************************************************************
* Public Funtions
************************************************************/
void up_devconsole(void)
{
(void)register_driver("/dev/console", &devconsole_fops, 0666, NULL);
}
int up_putc(int ch)
{
char b = ch;
(void)up_write(1, &b, 1);
return ch;
}
#endif /* linux */
