d3d2b51fa2
This patch introduces the initial support for stdio library in Galileo platform. For now, only standard output and error are supported. Both streams use the UART1 device. Newlib doesn't call open() for stdin, stdout, and stderr which means that the _write_r call is the first activity the stub will see on those streams. For that reason, we initialize the UART1 device in Galileo's platform main() function instead of in open() system call.
165 lines
4.6 KiB
C
165 lines
4.6 KiB
C
/*
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* Copyright (C) 2015, Intel Corporation. All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software 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 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/stat.h>
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#include <errno.h>
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#include "uart.h"
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#define CONSOLE_OUTPUT_DEV QUARK_X1000_UART_1
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#define HEAP_MAX_SIZE 2048
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static char _heap[HEAP_MAX_SIZE];
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static char *prog_break = _heap;
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int
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_close_r(struct _reent *ptr, int file)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return -1;
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}
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/*---------------------------------------------------------------------------*/
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int
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_isatty_r(struct _reent *ptr, int file)
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{
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/* Stubbed function */
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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_read_r(struct _reent *ptr, int file, char *buf, int len)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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_write_r(struct _reent *ptr, int file, const char *buf, int len)
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{
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int ret;
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int i;
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switch(file) {
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case 0:
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ptr->_errno = EBADF;
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ret = -1;
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break;
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case 1:
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case 2:
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for(i = 0; i < len; i++) {
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/* Since file descriptors 1 and 2 (stdout and stderr) are mapped to a
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* serial console, we should translate the 'newline' escape sequence
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* to 'carriage return' (CR) followed by 'line feed' (LF) ASCII
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* characters.
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*/
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if(buf[i] == '\n') {
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quarkX1000_uart_tx(CONSOLE_OUTPUT_DEV, '\r');
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}
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quarkX1000_uart_tx(CONSOLE_OUTPUT_DEV, buf[i]);
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}
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ret = len;
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break;
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default:
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/* We don't support any filesystem yet. */
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ptr->_errno = ENOTSUP;
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ret = -1;
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break;
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}
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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int
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_lseek_r(struct _reent *ptr, int file, int p, int dir)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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int
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_fstat_r(struct _reent *ptr, int file, struct stat *st)
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{
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/* We don't support the standard input yet so file descriptor 0 is not
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* supported by this function. Additionally, we don't have support for
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* any filesystem thus file descriptors greater than 2 are not supported
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* as well.
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*
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* We support standard ouput and error (file descriptors 1 and 2) only.
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*/
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if(file == 0 || file > 2) {
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ptr->_errno = ENOTSUP;
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return -1;
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}
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st->st_mode = S_IFCHR;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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caddr_t
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_sbrk_r(struct _reent *ptr, int incr)
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{
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char *prev_prog_break;
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/* If the new program break overruns the maximum heap address, we return
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* "Out of Memory" error to the user.
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*/
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if(prog_break + incr > _heap + HEAP_MAX_SIZE) {
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ptr->_errno = ENOMEM;
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return NULL;
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}
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prev_prog_break = prog_break;
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prog_break += incr;
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return prev_prog_break;
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}
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/*---------------------------------------------------------------------------*/
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void
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_kill_r(struct _reent *ptr)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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}
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/*---------------------------------------------------------------------------*/
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int
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_getpid_r(struct _reent *ptr)
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{
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/* Stubbed function */
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ptr->_errno = ENOTSUP;
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return 1;
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}
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