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/*
* Copyright (c) 2015 University of York.
* Hesham ALMatary <hmka501@york.ac.uk>
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <bsp.h>
#include <bsp/console-polled.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
static void outbyte_console( char );
static char inbyte_console( void );
void console_initialize_hardware(void)
{
/* Do nothing */
}
/* Epiphany simulator would handle this system call */
static void outbyte_console(char c)
{
register int chan asm("r0") = STDOUT_FILENO;
register void* addr asm("r1") = &c;
register int len asm("r2") = 1;
/* Invoke write system call to be handled by Epiphany simulator */
__asm__ __volatile__ ("trap 0" : : "r" (chan), "r" (addr), "r" (len));
}
static char inbyte_console(void)
{
char c;
register int chan asm("r0") = STDIN_FILENO;
register void* addr asm("r1") = &c;
register int len asm("r2") = 1;
/* Invoke read system call to be handled by Epiphany simulator */
asm ("trap 1" :: "r" (chan), "r" (addr), "r" (len));
return c;
}
/*
* console_outbyte_polled
*
* This routine transmits a character using polling.
*/
void console_outbyte_polled(
int port,
char ch
)
{
outbyte_console( ch );
}
/*
* console_inbyte_nonblocking
*
* This routine polls for a character.
*/
int console_inbyte_nonblocking(int port)
{
char c;
c = inbyte_console();
if (!c)
return -1;
return (int) c;
}
/*
* To support printk
*/
#include <rtems/bspIo.h>
static void Epiphany_output_char(char c) { console_outbyte_polled( 0, c ); }
BSP_output_char_function_type BSP_output_char = Epiphany_output_char;
BSP_polling_getchar_function_type BSP_poll_char =
(void *)console_inbyte_nonblocking;
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