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/* Copyright 2018 SiFive, Inc */
/* SPDX-License-Identifier: Apache-2.0 */
#include <metal/uart.h>
#include <metal/machine.h>
#if defined(__METAL_DT_STDOUT_UART_HANDLE)
/* This implementation serves as a small shim that interfaces with the first
* UART on a system. */
int metal_tty_putc(unsigned char c)
{
if (c == '\n') {
int out = metal_uart_putc(__METAL_DT_STDOUT_UART_HANDLE, '\r');
if (out != 0)
return out;
}
return metal_uart_putc(__METAL_DT_STDOUT_UART_HANDLE, c);
}
#ifndef __METAL_DT_STDOUT_UART_BAUD
#define __METAL_DT_STDOUT_UART_BAUD 115200
#endif
static void metal_tty_init(void) __attribute__((constructor));
static void metal_tty_init(void)
{
metal_uart_init(__METAL_DT_STDOUT_UART_HANDLE, __METAL_DT_STDOUT_UART_BAUD);
}
#else
/* This implementation of putc doesn't actually do anything, it's just there to
* provide a shim that eats all the characters so we can ensure that everything
* can link to metal_tty_putc. */
int nop_putc(unsigned char c) __attribute__((section(".text.metal.nop.putc")));
int nop_putc(unsigned char c) { return -1; }
int metal_tty_putc(unsigned char c) __attribute__((weak, alias("nop_putc")));
#warning "There is no default output device, metal_tty_putc() will throw away all input."
#endif
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