lxdream 0.9.1| filename | src/loader.c |
| changeset | 93:bb1def61e901 |
| prev | 88:0a1bd43fa4ad |
| next | 105:1faa0745f200 |
| author | nkeynes |
| date | Sun Feb 05 04:05:27 2006 +0000 (18 years ago) |
| permissions | -rw-r--r-- |
| last change | Video code reshuffle to start getting real video happening. Implement colourspace conversions Various tweaks |
| view | annotate | diff | log | raw |
1 /**
2 * $Id: loader.c,v 1.10 2006-02-05 04:04:25 nkeynes Exp $
3 *
4 * File loading routines, mostly for loading demos without going through the
5 * whole procedure of making a CD image for them.
6 *
7 * Copyright (c) 2005 Nathan Keynes.
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
20 #include <stdio.h>
21 #include <fcntl.h>
22 #include <sys/stat.h>
23 #include <errno.h>
24 #include <stdint.h>
25 #include "gui/gui.h"
26 #include "mem.h"
27 #include "sh4core.h"
28 #include "bootstrap.h"
30 char *bootstrap_file = DEFAULT_BOOTSTRAP_FILE;
31 char bootstrap_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
32 char iso_magic[6] = "\001CD001";
33 char *file_loader_extensions[][2] = {
34 { "sbi", "Self Boot Inducer" },
35 { "bin", "SH4 Bin file" },
36 { NULL, NULL } };
38 #define BOOTSTRAP_LOAD_ADDR 0x8C008000
39 #define BOOTSTRAP_SIZE 32768
41 #define BINARY_LOAD_ADDR 0x8C010000
43 #define CDI_V2 0x80000004
44 #define CDI_V3 0x80000005
46 gboolean file_load_magic( const gchar *filename )
47 {
48 char buf[32];
49 uint32_t tmpa[2];
50 struct stat st;
52 int fd = open( filename, O_RDONLY );
53 if( fd == -1 ) {
54 ERROR( "Unable to open file: '%s' (%s)", filename,
55 strerror(errno) );
56 return FALSE;
57 }
59 fstat( fd, &st );
60 /*
61 if( st.st_size < 32768 ) {
62 ERROR( "File '%s' too small to be a dreamcast image", filename );
63 close(fd);
64 return FALSE;
65 }
66 */
68 /* begin magic */
69 if( read( fd, buf, 32 ) != 32 ) {
70 ERROR( "Unable to read from file '%s'", filename );
71 close(fd);
72 return FALSE;
73 }
74 if( memcmp( buf, bootstrap_magic, 32 ) == 0 ) {
75 /* we have a DC bootstrap */
76 if( st.st_size == BOOTSTRAP_SIZE ) {
77 char *load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
78 lseek( fd, 0, SEEK_SET );
79 read( fd, load, BOOTSTRAP_SIZE );
80 bootstrap_dump( load );
81 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
82 gtk_gui_update();
83 } else {
84 /* look for a valid ISO9660 header */
85 lseek( fd, 32768, SEEK_SET );
86 read( fd, buf, 8 );
87 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
88 /* Alright, got it */
89 INFO( "Loading ISO9660 filesystem from '%s'",
90 filename );
91 }
92 }
93 } else if( memcmp( buf, "PK\x03\x04", 4 ) == 0 ) {
94 /* ZIP file, aka SBI file */
95 WARN( "SBI files not supported yet" );
96 } else if( memcpy( buf, "\x7fELF", 4 ) == 0 ) {
97 /* ELF binary */
98 WARN( "ELF files not supported yet" );
99 } else {
100 /* Assume raw binary */
101 file_load_binary( filename );
102 }
103 close(fd);
104 return TRUE;
105 }
107 int file_load_binary( const gchar *filename ) {
108 /* Load the binary itself */
109 mem_load_block( filename, BINARY_LOAD_ADDR, -1 );
110 if( bootstrap_file != NULL ) {
111 /* Load in a bootstrap before the binary, to initialize everything
112 * correctly
113 */
114 mem_load_block( bootstrap_file, BOOTSTRAP_LOAD_ADDR, BOOTSTRAP_SIZE );
115 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
116 } else {
117 sh4_set_pc( BINARY_LOAD_ADDR );
118 }
119 bios_install();
120 gtk_gui_update();
121 }
.