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annotate system.c @ 1374:8f404b1fa572

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Go back to resetting the refresh counter after a DMA. Probably not quite correct as it is probably reset on VDP triggered refresh, but this is close enough for now given the general limitations with my refresh code. VDP FIFO Testing seems to be passing 100% reliably again (was occassionally failing still with the last commit)
author Michael Pavone <pavone@retrodev.com>
date Tue, 23 May 2017 23:47:40 -0700
parents aee2177a1630
children a763523dadf4 360d5bab199f
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1 #include <string.h>
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2 #include "system.h"
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3 #include "genesis.h"
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4 #include "sms.h"
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5
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6 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize)
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7 {
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8 long len = strlen(str);
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9 return filesize >= offset+len && !memcmp(str, buffer + offset, len);
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10 }
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11
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12 system_type detect_system_type(system_media *media)
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13 {
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14 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) {
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15 //TODO: Differentiate between vanilla Genesis and Sega CD/32X games
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16 return SYSTEM_GENESIS;
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17 }
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18 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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19 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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20 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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21 ) {
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22 return SYSTEM_SMS;
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23 }
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24 //TODO: Detect Jaguar ROMs here
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25
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26 //Header based detection failed, examine filename for clues
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27 if (media->extension) {
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28 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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29 return SYSTEM_GENESIS;
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30 }
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31 if (!strcmp("sms", media->extension)) {
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32 return SYSTEM_SMS;
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33 }
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34 if (!strcmp("j64", media->extension)) {
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35 return SYSTEM_JAGUAR;
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36 }
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37 }
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38
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39 //More certain checks failed, look for a valid 68K reset vector
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40 if (media->size >= 8) {
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41 char *rom = media->buffer;
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42 uint32_t reset = rom[4] << 24 | rom[5] << 16 | rom[6] << 8 | rom[7];
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43 if (!(reset & 1) && reset < media->size) {
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44 //we have a valid looking reset vector, assume it's a Genesis ROM
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45 return SYSTEM_GENESIS;
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46 }
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47 }
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48 return SYSTEM_UNKNOWN;
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49 }
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50
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51 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region, rom_info *info_out)
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52 {
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53 void *lock_on = NULL;
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54 uint32_t lock_on_size = 0;
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55 if (media->chain) {
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56 lock_on = media->chain->buffer;
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57 lock_on_size = media->chain->size;
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58 }
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59 switch (stype)
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60 {
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61 case SYSTEM_GENESIS:
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62 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region, info_out))->header;
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63 #ifndef NO_Z80
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64 case SYSTEM_SMS:
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65 return &(alloc_configure_sms(media, opts, force_region, info_out))->header;
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66 #endif
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67 default:
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68 return NULL;
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69 }
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70 }