filename | src/loader.c |
changeset | 19:9da7a8e38f9d |
prev | 18:9a1b5d75703f |
next | 25:fa2d21d57942 |
author | nkeynes |
date | Thu Dec 22 07:38:12 2005 +0000 (18 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 |
file | annotate | diff | log | raw |
nkeynes@1 | 1 | /* |
nkeynes@1 | 2 | * |
nkeynes@1 | 3 | */ |
nkeynes@1 | 4 | |
nkeynes@1 | 5 | #include <stdio.h> |
nkeynes@1 | 6 | #include <fcntl.h> |
nkeynes@1 | 7 | #include <sys/stat.h> |
nkeynes@1 | 8 | #include <sys/mman.h> |
nkeynes@1 | 9 | #include <errno.h> |
nkeynes@1 | 10 | #include <stdint.h> |
nkeynes@1 | 11 | #include "gui.h" |
nkeynes@1 | 12 | #include "ipbin.h" |
nkeynes@1 | 13 | #include "sh4core.h" |
nkeynes@19 | 14 | #include "pvr2.h" |
nkeynes@1 | 15 | #include "mem.h" |
nkeynes@1 | 16 | |
nkeynes@1 | 17 | char ip_bin_magic[32] = "SEGA SEGAKATANA SEGA ENTERPRISES"; |
nkeynes@1 | 18 | char iso_magic[6] = "\001CD001"; |
nkeynes@1 | 19 | |
nkeynes@1 | 20 | #define CDI_V2 0x80000004 |
nkeynes@1 | 21 | #define CDI_V3 0x80000005 |
nkeynes@1 | 22 | |
nkeynes@18 | 23 | int open_file( const gchar *filename ) |
nkeynes@1 | 24 | { |
nkeynes@1 | 25 | char buf[32]; |
nkeynes@1 | 26 | uint32_t tmpa[2]; |
nkeynes@1 | 27 | struct stat st; |
nkeynes@1 | 28 | |
nkeynes@1 | 29 | int fd = open( filename, O_RDONLY ); |
nkeynes@1 | 30 | if( fd == -1 ) { |
nkeynes@1 | 31 | ERROR( "Unable to open file: '%s' (%s)", filename, |
nkeynes@1 | 32 | strerror(errno) ); |
nkeynes@1 | 33 | return; |
nkeynes@1 | 34 | } |
nkeynes@1 | 35 | |
nkeynes@1 | 36 | fstat( fd, &st ); |
nkeynes@1 | 37 | if( st.st_size < 32768 ) { |
nkeynes@1 | 38 | ERROR( "File '%s' too small to be a dreamcast image", filename ); |
nkeynes@1 | 39 | close(fd); |
nkeynes@1 | 40 | return; |
nkeynes@1 | 41 | } |
nkeynes@1 | 42 | |
nkeynes@1 | 43 | /* begin magic */ |
nkeynes@1 | 44 | if( read( fd, buf, 32 ) != 32 ) { |
nkeynes@1 | 45 | ERROR( "Unable to read from file '%s'", filename ); |
nkeynes@1 | 46 | close(fd); |
nkeynes@1 | 47 | return; |
nkeynes@1 | 48 | } |
nkeynes@1 | 49 | if( memcmp( buf, ip_bin_magic, 32 ) == 0 ) { |
nkeynes@1 | 50 | /* we have a DC bootstrap */ |
nkeynes@1 | 51 | if( st.st_size == BOOTSTRAP_SIZE ) { |
nkeynes@1 | 52 | char *load = mem_get_region( BOOTSTRAP_LOAD_ADDR ); |
nkeynes@1 | 53 | /* Just the bootstrap, no image... */ |
nkeynes@1 | 54 | WARN( "File '%s' contains bootstrap only, loading anyway", |
nkeynes@1 | 55 | filename ); |
nkeynes@1 | 56 | lseek( fd, 0, SEEK_SET ); |
nkeynes@1 | 57 | read( fd, load, BOOTSTRAP_SIZE ); |
nkeynes@1 | 58 | parse_ipbin( load ); |
nkeynes@1 | 59 | sh4_reset(); |
nkeynes@1 | 60 | sh4_set_pc( BOOTSTRAP_LOAD_ADDR + 0x300 ); |
nkeynes@9 | 61 | set_disassembly_region( main_debug, BOOTSTRAP_LOAD_ADDR ); |
nkeynes@9 | 62 | set_disassembly_pc( main_debug, sh4r.pc, TRUE ); |
nkeynes@2 | 63 | update_gui(); |
nkeynes@1 | 64 | } else { |
nkeynes@1 | 65 | /* look for a valid ISO9660 header */ |
nkeynes@1 | 66 | lseek( fd, 32768, SEEK_SET ); |
nkeynes@1 | 67 | read( fd, buf, 8 ); |
nkeynes@1 | 68 | if( memcmp( buf, iso_magic, 6 ) == 0 ) { |
nkeynes@1 | 69 | /* Alright, got it */ |
nkeynes@1 | 70 | INFO( "Loading ISO9660 filesystem from '%s'", |
nkeynes@1 | 71 | filename ); |
nkeynes@1 | 72 | } |
nkeynes@1 | 73 | } |
nkeynes@1 | 74 | } else { |
nkeynes@1 | 75 | /* check if it's a CDI file: */ |
nkeynes@1 | 76 | lseek( fd, -8, SEEK_END ); |
nkeynes@1 | 77 | read( fd, &tmpa, 8 ); |
nkeynes@1 | 78 | if( tmpa[0] == CDI_V2 || tmpa[0] == CDI_V3 ) { |
nkeynes@1 | 79 | /* Yup, it is */ |
nkeynes@1 | 80 | INFO( "Loading CDI file '%s'", filename ); |
nkeynes@1 | 81 | } else { |
nkeynes@1 | 82 | ERROR( "Don't know what to do with '%s'", filename ); |
nkeynes@1 | 83 | } |
nkeynes@1 | 84 | } |
nkeynes@1 | 85 | close(fd); |
nkeynes@18 | 86 | return 0; |
nkeynes@1 | 87 | } |
nkeynes@19 | 88 | |
nkeynes@19 | 89 | int load_bin_file( const gchar *filename ) { |
nkeynes@19 | 90 | mem_load_block( filename, 0x8c010000, -1 ); |
nkeynes@19 | 91 | sh4_set_pc( 0x8c010000 ); |
nkeynes@19 | 92 | set_disassembly_region( main_debug, 0x8c010000 ); |
nkeynes@19 | 93 | set_disassembly_pc( main_debug, sh4r.pc, TRUE ); |
nkeynes@19 | 94 | pvr2_set_base_address( 0x00025940 ); |
nkeynes@19 | 95 | update_gui(); |
nkeynes@19 | 96 | } |
.