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/*
* Copyright (C) 2024 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
/** @file
*
* SBI debug console
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <ipxe/sbi.h>
#include <ipxe/io.h>
#include <ipxe/console.h>
#include <config/console.h>
/* Set default console usage if applicable */
#if ! ( defined ( CONSOLE_SBI ) && CONSOLE_EXPLICIT ( CONSOLE_SBI ) )
#undef CONSOLE_SBI
#define CONSOLE_SBI ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
#endif
/** Buffered input character (if any) */
static unsigned char sbi_console_input;
/**
* Print a character to SBI console
*
* @v character Character to be printed
*/
static void sbi_putchar ( int character ) {
/* Write byte to console */
sbi_ecall_1 ( SBI_DBCN, SBI_DBCN_WRITE_BYTE, character );
}
/**
* Get character from SBI console
*
* @ret character Character read from console, if any
*/
static int sbi_getchar ( void ) {
int character;
/* Consume and return buffered character, if any */
character = sbi_console_input;
sbi_console_input = 0;
return character;
}
/**
* Check for character ready to read from SBI console
*
* @ret True Character available to read
* @ret False No character available to read
*/
static int sbi_iskey ( void ) {
struct sbi_return ret;
/* Do nothing if we already have a buffered character */
if ( sbi_console_input )
return sbi_console_input;
/* Read and buffer byte from console, if any */
ret = sbi_ecall_3 ( SBI_DBCN, SBI_DBCN_READ,
sizeof ( sbi_console_input ),
virt_to_phys ( &sbi_console_input ), 0 );
if ( ret.error )
return 0;
/* Return number of characters read and buffered */
return ret.value;
}
/** SBI console */
struct console_driver sbi_console_driver __console_driver = {
.putchar = sbi_putchar,
.getchar = sbi_getchar,
.iskey = sbi_iskey,
.usage = CONSOLE_SBI,
};
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