nes-proj/backyard/platform/c64/loader/c64-dio.c

120 lines
3.9 KiB
C

/**
* \addtogroup c64fs
* @{
*
*/
/**
* \file
* C64 direct disk I/O.
* \author Adam Dunkels <adam@dunkels.com>
*
*/
/*
* Copyright (c) 2003, Adam Dunkels.
* 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.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
*
* This file is part of the Contiki desktop OS
*
* $Id: c64-dio.c,v 1.1 2007/05/23 23:11:28 oliverschmidt Exp $
*
*/
#include "c64-dio.h"
#include "c64-dio-asm.h"
/*-----------------------------------------------------------------------------------*/
/**
* Read a block of data (256 bytes) from the disk.
*
* \param track The track of the disk block to be read.
*
* \param sector The sector of the disk block to be read.
*
* \param ptr A pointer to a buffer than must be able to accomodate
* 256 bytes of data.
*
* \return An error code or C64_DIO_OK if the data was successfully
* read.
*/
/*-----------------------------------------------------------------------------------*/
unsigned char
c64_dio_read_block(unsigned char track,
unsigned char sector,
unsigned char *ptr)
{
c64_dio_asm_track = track;
c64_dio_asm_sector = sector;
c64_dio_asm_ptr = ptr;
return c64_dio_asm_read_block();
}
/*-----------------------------------------------------------------------------------*/
/**
* Write a block of data (256 bytes) to the disk.
*
* \param track The track of the disk block to be written.
*
* \param sector The sector of the disk block to be written.
*
* \param ptr A pointer to a buffer containing the 256 bytes of data
* to be written.
*
* \return An error code or C64_DIO_OK if the data was successfully
* written.
*/
/*-----------------------------------------------------------------------------------*/
unsigned char
c64_dio_write_block(unsigned char track,
unsigned char sector,
unsigned char *ptr)
{
c64_dio_asm_track = track;
c64_dio_asm_sector = sector;
c64_dio_asm_ptr = ptr;
return c64_dio_asm_write_block();
}
/*-----------------------------------------------------------------------------------*/
/**
* Initialize the direct disk I/O routines for a particular disk drive.
*
* This function must be called before any of the other direct disk
* I/O functions can be used.
*
* \param drive The drive number of the disk drive for which the
* direct disk I/O should be enabled.
*/
/*-----------------------------------------------------------------------------------*/
void
c64_dio_init(unsigned char drive)
{
c64_dio_asm_init(drive);
}
/*-----------------------------------------------------------------------------------*/
/** @} */