lxdream 0.9.1| filename | src/loader.c |
| changeset | 19:9da7a8e38f9d |
| prev | 18:9a1b5d75703f |
| next | 25:fa2d21d57942 |
| author | nkeynes |
| date | Thu Dec 22 07:38:12 2005 +0000 (16 years ago) |
| permissions | -rw-r--r-- |
| last change | Implement 95% of the SCIF serial interface Implement basic load_bin_file function to try to load demos directly Update TMU to run all 3 timers, start on general timing |
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1 /*
2 *
3 */
5 #include <stdio.h>
6 #include <fcntl.h>
7 #include <sys/stat.h>
8 #include <sys/mman.h>
9 #include <errno.h>
10 #include <stdint.h>
11 #include "gui.h"
12 #include "ipbin.h"
13 #include "sh4core.h"
14 #include "pvr2.h"
15 #include "mem.h"
17 char ip_bin_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES";
18 char iso_magic[6] = "\001CD001";
20 #define CDI_V2 0x80000004
21 #define CDI_V3 0x80000005
23 int open_file( const gchar *filename )
24 {
25 char buf[32];
26 uint32_t tmpa[2];
27 struct stat st;
29 int fd = open( filename, O_RDONLY );
30 if( fd == -1 ) {
31 ERROR( "Unable to open file: '%s' (%s)", filename,
32 strerror(errno) );
33 return;
34 }
36 fstat( fd, &st );
37 if( st.st_size < 32768 ) {
38 ERROR( "File '%s' too small to be a dreamcast image", filename );
39 close(fd);
40 return;
41 }
43 /* begin magic */
44 if( read( fd, buf, 32 ) != 32 ) {
45 ERROR( "Unable to read from file '%s'", filename );
46 close(fd);
47 return;
48 }
49 if( memcmp( buf, ip_bin_magic, 32 ) == 0 ) {
50 /* we have a DC bootstrap */
51 if( st.st_size == BOOTSTRAP_SIZE ) {
52 char *load = mem_get_region( BOOTSTRAP_LOAD_ADDR );
53 /* Just the bootstrap, no image... */
54 WARN( "File '%s' contains bootstrap only, loading anyway",
55 filename );
56 lseek( fd, 0, SEEK_SET );
57 read( fd, load, BOOTSTRAP_SIZE );
58 parse_ipbin( load );
59 sh4_reset();
60 sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 );
61 set_disassembly_region( main_debug, BOOTSTRAP_LOAD_ADDR );
62 set_disassembly_pc( main_debug, sh4r.pc, TRUE );
63 update_gui();
64 } else {
65 /* look for a valid ISO9660 header */
66 lseek( fd, 32768, SEEK_SET );
67 read( fd, buf, 8 );
68 if( memcmp( buf, iso_magic, 6 ) == 0 ) {
69 /* Alright, got it */
70 INFO( "Loading ISO9660 filesystem from '%s'",
71 filename );
72 }
73 }
74 } else {
75 /* check if it's a CDI file: */
76 lseek( fd, -8, SEEK_END );
77 read( fd, &tmpa, 8 );
78 if( tmpa[0] == CDI_V2 || tmpa[0] == CDI_V3 ) {
79 /* Yup, it is */
80 INFO( "Loading CDI file '%s'", filename );
81 } else {
82 ERROR( "Don't know what to do with '%s'", filename );
83 }
84 }
85 close(fd);
86 return 0;
87 }
89 int load_bin_file( const gchar *filename ) {
90 mem_load_block( filename, 0x8c010000, -1 );
91 sh4_set_pc( 0x8c010000 );
92 set_disassembly_region( main_debug, 0x8c010000 );
93 set_disassembly_pc( main_debug, sh4r.pc, TRUE );
94 pvr2_set_base_address( 0x00025940 );
95 update_gui();
96 }
.