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annotate transz80.c @ 761:ffb8cc5845fa

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Add support for making a "portable" build on OSX to Makefile
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Jun 2015 17:16:24 -0700
parents 759c38bf97f8
children
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140af5509ce7 Added copyright notice to source files and added GPL license text in COPYING
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1 /*
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2 Copyright 2013 Michael Pavone
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3 This file is part of BlastEm.
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text.
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5 */
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6 #include "z80inst.h"
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7 #include "z80_to_x86.h"
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8 #include "mem.h"
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9 #include "vdp.h"
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 uint8_t z80_ram[0x2000];
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14 uint16_t cart[0x200000];
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15
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16 #define MCLKS_PER_Z80 15
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17 //TODO: Figure out the exact value for this
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18 #define MCLKS_PER_FRAME (MCLKS_LINE*262)
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19 #define VINT_CYCLE ((MCLKS_LINE * 226)/MCLKS_PER_Z80)
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20 #define CYCLE_NEVER 0xFFFFFFFF
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21
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22 uint8_t z80_read_ym(uint16_t location, z80_context * context)
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23 {
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24 return 0xFF;
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25 }
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26
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27 z80_context * z80_write_ym(uint16_t location, z80_context * context, uint8_t value)
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28 {
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29 return context;
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30 }
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31
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32 z80_context * z80_vdp_port_write(uint16_t location, z80_context * context, uint8_t value)
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33 {
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34 return context;
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35 }
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36
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37 int main(int argc, char ** argv)
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38 {
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39 long filesize;
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40 uint8_t *filebuf;
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41 z80_options opts;
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42 z80_context context;
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43 if (argc < 2) {
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44 fputs("usage: transz80 zrom [cartrom]\n", stderr);
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45 exit(1);
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46 }
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47 FILE * f = fopen(argv[1], "rb");
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48 if (!f) {
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49 fprintf(stderr, "unable to open file %s\n", argv[2]);
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50 exit(1);
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51 }
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52 fseek(f, 0, SEEK_END);
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53 filesize = ftell(f);
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54 fseek(f, 0, SEEK_SET);
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55 fread(z80_ram, 1, filesize < sizeof(z80_ram) ? filesize : sizeof(z80_ram), f);
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56 fclose(f);
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57 if (argc > 2) {
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58 f = fopen(argv[2], "rb");
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59 if (!f) {
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60 fprintf(stderr, "unable to open file %s\n", argv[2]);
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61 exit(1);
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62 }
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63 fseek(f, 0, SEEK_END);
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64 filesize = ftell(f);
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65 fseek(f, 0, SEEK_SET);
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66 fread(cart, 1, filesize < sizeof(cart) ? filesize : sizeof(cart), f);
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67 fclose(f);
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68 for(unsigned short * cur = cart; cur - cart < (filesize/2); ++cur)
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69 {
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70 *cur = (*cur >> 8) | (*cur << 8);
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71 }
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72 }
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73 init_z80_opts(&opts);
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74 init_z80_context(&context, &opts);
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75 //Z80 RAM
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76 context.mem_pointers[0] = z80_ram;
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77 context.sync_cycle = context.target_cycle = MCLKS_PER_FRAME/MCLKS_PER_Z80;
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78 context.int_cycle = CYCLE_NEVER;
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79 //cartridge/bank
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80 context.mem_pointers[1] = context.mem_pointers[2] = (uint8_t *)cart;
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81 z80_reset(&context);
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82 for(;;)
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83 {
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84 z80_run(&context);
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85 if (context.current_cycle >= MCLKS_PER_FRAME/MCLKS_PER_Z80) {
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86 context.current_cycle -= MCLKS_PER_FRAME/MCLKS_PER_Z80;
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87 }
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88 if (context.current_cycle < VINT_CYCLE && context.iff1) {
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89 context.int_cycle = VINT_CYCLE;
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90 }
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91 context.target_cycle = context.sync_cycle < context.int_cycle ? context.sync_cycle : context.int_cycle;
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92 }
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93 return 0;
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94 }