nes-proj/drivers/platform/galileo/newlib-syscalls.c

175 lines
4.8 KiB
C

/*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* 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 of the copyright holder 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 HOLDER 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.
*/
#include <sys/stat.h>
#include <errno.h>
#include "uart.h"
#include "helpers.h"
#define CONSOLE_OUTPUT_DEV QUARK_X1000_UART_1
#define HEAP_MAX_SIZE 2048
static char _heap[HEAP_MAX_SIZE];
static char *prog_break = _heap;
int
_close_r(struct _reent *ptr, int file)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return -1;
}
/*---------------------------------------------------------------------------*/
void
_exit(int status)
{
halt();
}
/*---------------------------------------------------------------------------*/
int
_getpid_r(struct _reent *ptr)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return -1;
}
/*---------------------------------------------------------------------------*/
int
_isatty_r(struct _reent *ptr, int file)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return 0;
}
/*---------------------------------------------------------------------------*/
int
_kill_r(struct _reent *ptr, int pid, int signal)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return -1;
}
/*---------------------------------------------------------------------------*/
int
_read_r(struct _reent *ptr, int file, char *buf, int len)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return -1;
}
/*---------------------------------------------------------------------------*/
int
_write_r(struct _reent *ptr, int file, const char *buf, int len)
{
int ret;
int i;
switch(file) {
case 0:
ptr->_errno = EBADF;
ret = -1;
break;
case 1:
case 2:
for(i = 0; i < len; i++) {
/* Since file descriptors 1 and 2 (stdout and stderr) are mapped to a
* serial console, we should translate the 'newline' escape sequence
* to 'carriage return' (CR) followed by 'line feed' (LF) ASCII
* characters.
*/
if(buf[i] == '\n') {
quarkX1000_uart_tx(CONSOLE_OUTPUT_DEV, '\r');
}
quarkX1000_uart_tx(CONSOLE_OUTPUT_DEV, buf[i]);
}
ret = len;
break;
default:
/* We don't support any filesystem yet. */
ptr->_errno = ENOTSUP;
ret = -1;
break;
}
return ret;
}
/*---------------------------------------------------------------------------*/
int
_lseek_r(struct _reent *ptr, int file, int p, int dir)
{
/* Stubbed function */
ptr->_errno = ENOTSUP;
return -1;
}
/*---------------------------------------------------------------------------*/
int
_fstat_r(struct _reent *ptr, int file, struct stat *st)
{
/* We don't support the standard input yet so file descriptor 0 is not
* supported by this function. Additionally, we don't have support for
* any filesystem thus file descriptors greater than 2 are not supported
* as well.
*
* We support standard ouput and error (file descriptors 1 and 2) only.
*/
if(file == 0 || file > 2) {
ptr->_errno = ENOTSUP;
return -1;
}
st->st_mode = S_IFCHR;
return 0;
}
/*---------------------------------------------------------------------------*/
caddr_t
_sbrk_r(struct _reent *ptr, int incr)
{
char *prev_prog_break;
/* If the new program break overruns the maximum heap address, we return
* "Out of Memory" error to the user.
*/
if(prog_break + incr > _heap + HEAP_MAX_SIZE) {
ptr->_errno = ENOMEM;
return NULL;
}
prev_prog_break = prog_break;
prog_break += incr;
return prev_prog_break;
}