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annotate blastcpm.c @ 1116:fe8c79f82c22

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More cleanup in preparation for SMS/Mark III support
author Michael Pavone <pavone@retrodev.com>
date Thu, 22 Dec 2016 10:51:33 -0800
parents cf6149b7c6e5
children 8f14767661fa
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rev   line source
820
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <stddef.h>
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4 #include <string.h>
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5 #include <sys/select.h>
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6
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7 #include "z80_to_x86.h"
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8 #include "util.h"
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10 uint8_t ram[64 * 1024];
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12 #define START_OFF 0x100
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13 #define OS_START 0xE400
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14 #define OS_RESET 0xE403
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15 int headless = 1;
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17 void z80_next_int_pulse(z80_context * context)
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18 {
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19 context->int_pulse_start = context->int_pulse_end = CYCLE_NEVER;
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20 }
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22 void render_errorbox(char *title, char *message)
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23 {
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24 }
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26 void render_infobox(char *title, char *message)
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27 {
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28 }
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30 void *console_write(uint32_t address, void *context, uint8_t value)
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31 {
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32 putchar(value);
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33 return context;
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34 }
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36 uint8_t console_read(uint32_t address, void *context)
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37 {
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38 return getchar();
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39 }
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40
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41 void *console_flush_write(uint32_t address, void *context, uint8_t value)
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42 {
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43 fflush(stdout);
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44 return context;
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45 }
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47 uint8_t console_status_read(uint32_t address, void *context)
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48 {
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49 fd_set read_fds;
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50 FD_ZERO(&read_fds);
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51 struct timeval timeout;
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52 timeout.tv_sec = 0;
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53 timeout.tv_usec = 0;
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54 FD_SET(fileno(stdin), &read_fds);
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55 return select(fileno(stdin)+1, &read_fds, NULL, NULL, &timeout) > 0;
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56 }
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57
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58 void *exit_write(uint32_t address, void *context, uint8_t value)
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59 {
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60 exit(0);
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61 return context;
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62 }
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63
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64 const memmap_chunk z80_map[] = {
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65 { 0x0000, 0x10000, 0xFFFF, 0, MMAP_READ | MMAP_WRITE | MMAP_CODE, ram, NULL, NULL, NULL, NULL},
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66 };
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67
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68 const memmap_chunk io_map[] = {
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69 { 0x0, 0x1, 0xFFFF, 0, 0, NULL, NULL, NULL, console_read, console_write},
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70 { 0x1, 0x2, 0xFFFF, 0, 0, NULL, NULL, NULL, console_status_read, console_flush_write},
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71 { 0x2, 0x3, 0xFFFF, 0, 0, NULL, NULL, NULL, NULL, exit_write},
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72 };
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73
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74 int main(int argc, char **argv)
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75 {
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76 FILE *f = fopen("fake_cpm.bin", "rb");
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77 long fsize = file_size(f);
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78 if (fsize > sizeof(ram) - OS_START) {
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79 fsize = sizeof(ram) - OS_START;
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80 }
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81 if (fread(ram + OS_START, 1, fsize, f) != fsize) {
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82 fprintf(stderr, "Error reading from fake_cpm.bin\n");
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83 exit(1);
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84 }
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85 f = fopen(argv[1], "rb");
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86 fsize = file_size(f);
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87 if (fsize > OS_START - START_OFF) {
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88 fsize = OS_START - START_OFF;
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89 }
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90 if (fread(ram + START_OFF, 1, fsize, f) != fsize) {
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91 fprintf(stderr, "Error reading from file %s\n", argv[1]);
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92 exit(1);
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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93 }
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94 fclose(f);
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95 ram[0] = 0xC3;
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96 ram[1] = OS_RESET & 0xFF;
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97 ram[2] = OS_RESET >> 8;
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98 ram[5] = 0xC3;
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99 ram[6] = OS_START & 0xFF;
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100 ram[7] = OS_START >> 8;
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101
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102 z80_options opts;
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103 z80_context context;
1116
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104 init_z80_opts(&opts, z80_map, 1, io_map, 3, 1, 0xFF);
820
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105 init_z80_context(&context, &opts);
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106 for(;;)
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107 {
cf6149b7c6e5 Implement a tiny bit of CPM BDOS and add a corresponding Z80 core driver so that simple CPM programs like ZEXDOC/ZEXALL can be run against my Z80 core
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108 z80_run(&context, 1000000);
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109 context.current_cycle = 0;
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110 }
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111 return 0;
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112 }