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/*
* Copyright (c) 2015 University of York.
* Hesham Almatary <hesham@alumni.york.ac.uk>
*
* Copyright (c) 2013, The Regents of the University of California (Regents).
* 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.
*
* 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>
/* Most of the code below is copied from riscv-pk project */
# define TOHOST_CMD(dev, cmd, payload) \
(((uint64_t)(dev) << 56) | ((uint64_t)(cmd) << 48) | (uint64_t)(payload))
#define FROMHOST_DEV(fromhost_value) ((uint64_t)(fromhost_value) >> 56)
#define FROMHOST_CMD(fromhost_value) ((uint64_t)(fromhost_value) << 8 >> 56)
#define FROMHOST_DATA(fromhost_value) ((uint64_t)(fromhost_value) << 16 >> 16)
volatile uint64_t tohost __attribute__((section(".htif")));
volatile uint64_t fromhost __attribute__((section(".htif")));
volatile int htif_console_buf;
static void __check_fromhost()
{
uint64_t fh = fromhost;
if (!fh) {
return;
}
fromhost = 0;
// this should be from the console
assert(FROMHOST_DEV(fh) == 1);
switch (FROMHOST_CMD(fh)) {
case 0:
htif_console_buf = 1 + (uint8_t)FROMHOST_DATA(fh);
break;
case 1:
break;
default:
assert(0);
}
}
static void __set_tohost(uintptr_t dev, uintptr_t cmd, uintptr_t data)
{
while (tohost) {
__check_fromhost();
}
tohost = TOHOST_CMD(dev, cmd, data);
}
int htif_console_getchar()
{
__check_fromhost();
int ch = htif_console_buf;
if (ch >= 0) {
htif_console_buf = -1;
__set_tohost(1, 0, 0);
}
return ch - 1;
}
static void do_tohost_fromhost(uintptr_t dev, uintptr_t cmd, uintptr_t data)
{
__set_tohost(dev, cmd, data);
while (1) {
uint64_t fh = fromhost;
if (fh) {
if (FROMHOST_DEV(fh) == dev && FROMHOST_CMD(fh) == cmd) {
fromhost = 0;
break;
}
__check_fromhost();
}
}
}
void htif_console_putchar(uint8_t ch)
{
__set_tohost(1, 1, ch);
}
void htif_poweroff()
{
while (1) {
fromhost = 0;
tohost = 1;
}
}
void console_initialize_hardware(void)
{
/* Do nothing */
}
static void outbyte_console(char ch)
{
htif_console_putchar(ch);
}
static char inbyte_console(void)
{
return htif_console_getchar();
}
/*
* 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 RISCV_output_char(char c)
{
console_outbyte_polled( 0, c );
}
BSP_output_char_function_type BSP_output_char = RISCV_output_char;
BSP_polling_getchar_function_type BSP_poll_char =
(void *)console_inbyte_nonblocking;
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