1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/dcload.c	Mon Mar 13 12:38:39 2006 +0000
     1.3 @@ -0,0 +1,87 @@
     1.4 +/**
     1.5 + * $Id: dcload.c,v 1.1 2006-03-13 12:38:34 nkeynes Exp $
     1.6 + * 
     1.7 + * DC-load syscall implementation.
     1.8 + *
     1.9 + * Copyright (c) 2005 Nathan Keynes.
    1.10 + *
    1.11 + * This program is free software; you can redistribute it and/or modify
    1.12 + * it under the terms of the GNU General Public License as published by
    1.13 + * the Free Software Foundation; either version 2 of the License, or
    1.14 + * (at your option) any later version.
    1.15 + *
    1.16 + * This program is distributed in the hope that it will be useful,
    1.17 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.18 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    1.19 + * GNU General Public License for more details.
    1.20 + */
    1.21 +
    1.22 +#include <stdio.h>
    1.23 +#include "dream.h"
    1.24 +#include "mem.h"
    1.25 +#include "syscall.h"
    1.26 +#include "sh4/sh4core.h"
    1.27 +
    1.28 +#define SYS_READ 0
    1.29 +#define SYS_WRITE 1
    1.30 +#define SYS_OPEN 2
    1.31 +#define SYS_CLOSE 3
    1.32 +#define SYS_CREAT 4
    1.33 +#define SYS_LINK 5
    1.34 +#define SYS_UNLINK 6
    1.35 +#define SYS_CHDIR 7
    1.36 +#define SYS_CHMOD 8
    1.37 +#define SYS_LSEEK 9
    1.38 +#define SYS_FSTAT 10
    1.39 +#define SYS_TIME 11
    1.40 +#define SYS_STAT 12
    1.41 +#define SYS_UTIME 13
    1.42 +#define SYS_ASSIGNWRKMEM 14
    1.43 +#define SYS_EXIT 15
    1.44 +#define SYS_OPENDIR 16
    1.45 +#define SYS_CLOSEDIR 17
    1.46 +#define SYS_READDIR 18
    1.47 +#define SYS_GETHOSTINFO 19
    1.48 +
    1.49 +#define SYS_MAGIC 0xDEADBEEF
    1.50 +#define SYS_MAGIC_ADDR 0x8c004004
    1.51 +#define SYSCALL_ADDR 0x8c004008
    1.52 +
    1.53 +void dcload_syscall( uint32_t syscall_id ) 
    1.54 +{
    1.55 +    uint32_t syscall = sh4r.r[4];
    1.56 +    switch( sh4r.r[4] ) {
    1.57 +    case SYS_READ:
    1.58 +	if( sh4r.r[5] == 0 ) {
    1.59 +	    char *buf = mem_get_region( sh4r.r[6] );
    1.60 +	    int length = sh4r.r[7];
    1.61 +	    sh4r.r[0] = read( 0, buf, length );
    1.62 +	} else {
    1.63 +	    sh4r.r[0] = -1;
    1.64 +	}
    1.65 +	break;
    1.66 +    case SYS_WRITE:
    1.67 +	if( sh4r.r[5] == 1 || sh4r.r[5] == 2 ) {
    1.68 +	    char *buf = mem_get_region( sh4r.r[6] );
    1.69 +	    int length = sh4r.r[7];
    1.70 +	    sh4r.r[0] = write( sh4r.r[5], buf, length );
    1.71 +	} else {
    1.72 +	    sh4r.r[0] = -1;
    1.73 +	}
    1.74 +	break;
    1.75 +    case SYS_EXIT:
    1.76 +	dreamcast_stop();
    1.77 +	sh4_stop();
    1.78 +	sh4r.r[0] = 0;
    1.79 +	break;
    1.80 +    default:
    1.81 +	sh4r.r[0] = -1;
    1.82 +    }
    1.83 +
    1.84 +}
    1.85 +
    1.86 +void dcload_install() 
    1.87 +{
    1.88 +    syscall_add_hook_vector( 0xF0, SYSCALL_ADDR, dcload_syscall );
    1.89 +    sh4_write_long( SYS_MAGIC_ADDR, SYS_MAGIC );
    1.90 +}