137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
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/************************************************************
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* up_devconsole.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <errno.h>
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#include <nuttx/fs.h>
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#include "up_internal.h"
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/************************************************************
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* Definitions
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************************************************************/
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#define READ 3
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#define WRITE 4
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/************************************************************
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* Private Function Prototypes
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************************************************************/
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static ssize_t devconsole_read(struct file *, char *, size_t);
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static ssize_t devconsole_write(struct file *, const char *, size_t);
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/************************************************************
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* Private Data
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************************************************************/
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static struct file_operations devconsole_fops =
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{
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.read = devconsole_read,
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.write = devconsole_write,
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};
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/************************************************************
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* Private Functions
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************************************************************/
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static inline int up_read(int fd, void* buf, size_t count)
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{
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uint32 result;
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__asm__ volatile ("int $0x80" \
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: "=a" (result) \
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: "0" (READ), "b" ((uint32)(fd)), "c" ((uint32)(buf)), "d" ((uint32)(count)) \
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: "memory");
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return (int)result;
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}
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static inline int up_write(int fd, const void* buf, size_t count)
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{
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uint32 result;
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__asm__ volatile ("int $0x80" \
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: "=a" (result) \
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: "0" (WRITE), "b" ((uint32)(fd)), "c" ((uint32)(buf)), "d" ((uint32)(count)) \
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: "memory");
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return (int)result;
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}
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static inline int up_check_result(int result)
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{
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if (result >= (uint32)(-(128 + 1)))
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{
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*get_errno_ptr() = -result;
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result = ERROR;
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}
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return result;
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}
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static ssize_t devconsole_read(struct file *filp, char *buffer, size_t len)
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{
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return up_check_result(up_read(1, buffer, len));
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}
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static ssize_t devconsole_write(struct file *filp, const char *buffer, size_t len)
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{
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return up_check_result(up_write(1, buffer, len));
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}
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/************************************************************
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* Public Funtions
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************************************************************/
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void up_devconsole(void)
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{
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(void)register_inode("/dev/console", &devconsole_fops, 0666, NULL);
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}
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int up_putc(int ch)
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{
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char b = ch;
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(void)up_write(1, &b, 1);
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return ch;
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}
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