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Initial commit. CPU working well enough for simple hello world program.
author Michael Pavone <pavone@retrodev.com>
date Tue, 22 Mar 2016 22:44:02 -0700
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children 5176efdda5ae
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7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
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1 #include <stdint.h>
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <string.h>
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5 #include "cpu.h"
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6
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7 #define CYCLES_PER_FRAME ((48000*25)/60)
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8
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9 uint8_t rom[48 * 1024];
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10 uint8_t ram[16 * 1024];
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11
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12 enum {
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13 PORT_CONTROLLER_1,
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14 PORT_CONTROLLER_2,
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15 PORT_CONTROLLER_3,
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16 PORT_CONTROLLER_4,
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17 PORT_FREQUENCY_A,
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18 PORT_FREQUENCY_B,
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19 PORT_FREQUENCY_C,
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20 PORT_FREQUENCY_D,
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21 PORT_VOLUME_AB,
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22 PORT_VOLUME_CD,
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23 PORT_TIMER,
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24 PORT_SERIAL,
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25 };
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26
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27 void debug_port_write(cpu *context, uint8_t port, uint16_t value)
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28 {
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29 putchar(value);
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30 }
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31
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32 uint16_t debug_port_read(cpu *context, uint8_t port)
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33 {
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34 return getchar();
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35 }
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36
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37 memory_region regions[] = {
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38 {rom, 0, sizeof(rom)-1, MEM_READ},
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39 {ram, sizeof(rom), sizeof(rom)-1+sizeof(ram), MEM_READ},
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40 };
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41
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42 void run_console(cpu *context)
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43 {
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44 for(;;)
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45 {
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46 run_cpu(context, CYCLES_PER_FRAME);
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47 context->cycles -= CYCLES_PER_FRAME;
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48 }
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49 }
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50
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51
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52
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53 int main(int argc, char **argv)
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54 {
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55 if (argc < 2) {
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56 fputs("usage: s16 FILE\n", stderr);
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57 return 1;
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58 }
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59 FILE *f = fopen(argv[1], "rb");
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60 if (!f) {
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61 fprintf(stderr, "Failed to open %s for reading\n", argv[1]);
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62 return 1;
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63 }
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64
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65 size_t read;
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66 if ((read = fread(rom, 1, sizeof(rom), f)) < sizeof(rom)) {
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67 memset(rom + read, 0xFF, sizeof(rom)-read);
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68 }
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69 cpu *context = alloc_cpu(1, sizeof(regions)/sizeof(memory_region), regions);
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70 context->port_handlers[PORT_SERIAL].write = debug_port_write;
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71 context->port_handlers[PORT_SERIAL].read = debug_port_read;
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72 run_console(context);
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73 return 0;
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74 }