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Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
author Michael Pavone <pavone@retrodev.com>
date Thu, 06 Oct 2016 09:35:35 -0700
parents 382614130914
children bc86eaf6699d
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rev   line source
1080
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1 #include <stdint.h>
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2 #include <stdio.h>
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3 #include <stddef.h>
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4 #include <stdlib.h>
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5 #include "m68k_core.h"
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6 #include "jaguar.h"
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7 #include "util.h"
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8 #include "debug.h"
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9
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10 //BIOS Area Memory map
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11 // 10 00 00 - 10 04 00 : Video mode/ Memory control registers
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12 // 10 04 00 - 10 08 00 : CLUT
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13 // 10 08 00 - 10 10 00 : Line buffer A
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14 // 10 10 00 - 10 18 00 : Line buffer B
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15 // 10 18 00 - 10 20 00 : Write Line buffer
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16 // 10 21 00 - 10 30 00 : GPU/blitter registers
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17 // 10 30 00 - 10 40 00 : GPU Local RAM (mirrored every 1K?)
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18 // 11 00 00 - 11 00 40 : Timer/Clock registers
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19 // 11 40 00 - 11 40 04 : Joystick Interface
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20 // 11 A1 00 - 11 A1 52 : DSP/DAC/I2S Registers
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21 // 11 B0 00 - 11 D0 00 : DSP Local RAM (8KB)
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22 // 11 D0 00 - 11 E0 00 : Wave table ROM
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23
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24 int headless = 1;
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25
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26
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27 void rom0_write_16(uint32_t address, jaguar_context *system, uint16_t value)
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28 {
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29 //TODO: Use write_latch and write_pending to turn two 16-bit writes into a 32-bit one
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30 //Documentation heavily suggests that writes to most registers should be 32-bits wide
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31 if (address < 0x100000 || address >= 0x120000) {
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32 //Boot ROM
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33 fprintf(stderr, "Invalid write to Boot ROM - %X:%X\n", address, value);
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34 return;
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35 }
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36 if (address < 0x103000) {
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37 if (address < 0x101000) {
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38 if (address < 0x100400) {
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39 //Video mode / Memory control registers
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40 switch(address & 0x3FE)
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41 {
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42 case 0:
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43 if (((value ^ system->memcon1) & 1) || !system->memcon_written) {
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44 uint16_t **mem_pointers = system->m68k->mem_pointers;
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45 int rom = value & 1 ? 4 : 1;
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46 int ram0 = value & 1 ? 0 : 6;
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47 int ram1 = value & 1 ? 2 : 4;
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48 mem_pointers[ram0] = mem_pointers[ram0 + 1] = system->dram;
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49 //these are probably open bus, but mirror DRAM for now
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50 mem_pointers[ram1] = mem_pointers[ram1 + 1] = system->dram;
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51
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52 mem_pointers[rom] = system->cart;
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53 mem_pointers[rom + 1] = system->cart + ((0x200000 & (system->cart_size-1)) >> 1);
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54 mem_pointers[rom + 2] = system->cart + ((0x400000 & (system->cart_size-1)) >> 1);
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55 system->memcon_written = 1;
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56 //TODO: invalidate code cache
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57 }
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58 system->memcon1 = value;
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59 break;
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60 case 2:
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61 system->memcon2 = value;
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62 break;
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63 default:
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64 fprintf(stderr, "Unhandled write to video mode/memory control registers - %X:%X\n", address, value);
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65 break;
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66 }
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67 } else if (address < 0x100800) {
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68 //CLUT
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69 address = address >> 1 & 255;
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70 system->clut[address] = value;
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71 } else {
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72 //Line buffer A
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73 address = address >> 1 & 0x3FF;
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74 if (address < LINEBUFFER_WORDS) {
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75 system->line_buffer_a[address] = value;
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76 }
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77 }
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78 } else if (address < 0x101800) {
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79 //Line buffer B
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80 address = address >> 1 & 0x3FF;
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81 if (address < LINEBUFFER_WORDS) {
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82 system->line_buffer_b[address] = value;
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83 }
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84 } else if (address < 0x102100) {
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85 //Write Line Buffer
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86 address = address >> 1 & 0x3FF;
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87 if (address < LINEBUFFER_WORDS) {
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88 system->write_line_buffer[address] = value;
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89 }
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90 } else {
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91 //GPU/Blitter registers
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92 fprintf(stderr, "Unhandled write to GPU/Blitter registers %X: %X\n", address, value);
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93 }
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94 } else if (address < 0x11A100) {
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95 if (address < 0x110000) {
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96 //GPU Local RAM
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97 uint32_t offset = address >> 2 & (GPU_RAM_BYTES / sizeof(uint32_t) - 1);
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98 uint32_t value32 = value;
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99 if (address & 2) {
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100 system->gpu_local[offset] &= 0xFFFF0000;
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101 } else {
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102 system->gpu_local[offset] &= 0x0000FFFF;
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103 value32 = value32 << 16;
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104 }
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105 system->gpu_local[offset] |= value32;
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106 } else if (address < 0x114000) {
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107 //timer clock registers
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108 fprintf(stderr, "Unhandled write to timer/clock registers - %X:%X\n", address, value);
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109 } else {
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110 //joystick interface
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111 fprintf(stderr, "Unhandled write to joystick interface - %X:%X\n", address, value);
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112 }
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113 } else if (address < 0x11B000) {
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114 //DSP/DAC/I2S Registers
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115 fprintf(stderr, "Unhandled write to DSP/DAC/I2S registers - %X:%X\n", address, value);
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116 } else if (address < 0x11D000) {
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117 //DSP local RAM
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118 uint32_t offset = address >> 2 & (DSP_RAM_BYTES / sizeof(uint32_t) - 1);
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119 uint32_t value32 = value;
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120 if (address & 2) {
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121 system->dsp_local[offset] &= 0xFFFF0000;
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122 } else {
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123 system->dsp_local[offset] &= 0x0000FFFF;
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124 value32 = value32 << 16;
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125 }
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126 system->gpu_local[offset] |= value32;
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127 } else {
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128 //Wave table ROM
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129 fprintf(stderr, "Invalid write to wave table ROM - %X:%X\n", address, value);
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130 }
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
131 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
132
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
133 uint16_t rom0_read_16(uint32_t address, jaguar_context *system)
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
134 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
135 if (address < 0x100000 || address >= 0x120000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
136 //Boot ROM
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
137 address = address >> 1 & ((system->bios_size >> 1) - 1);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 return system->bios[address];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 if (address < 0x103000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 if (address < 0x101000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 if (address < 0x100400) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
143 //Video mode / Memory control registers
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
144 fprintf(stderr, "Unhandled read from video mode/memory control registers - %X\n", address);
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
145 } else if (address < 0x100800) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
146 //CLUT
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
147 address = address >> 1 & 255;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
148 return system->clut[address];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
149 } else {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
150 //Line buffer A
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
151 address = address >> 1 & 0x3FF;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
152 if (address < LINEBUFFER_WORDS) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
153 return system->line_buffer_a[address];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
154 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
155 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
156 } else if (address < 0x101800) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
157 //Line buffer B
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
158 address = address >> 1 & 0x3FF;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
159 if (address < LINEBUFFER_WORDS) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
160 return system->line_buffer_b[address];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
161 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
162 } else if (address < 0x102100) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
163 //Write Line Buffer
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
164 address = address >> 1 & 0x3FF;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
165 if (address < LINEBUFFER_WORDS) {
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Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
166 return system->write_line_buffer[address];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
167 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
168 } else {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
169 //GPU/Blitter registers
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
170 fprintf(stderr, "Unhandled read from GPU/Blitter registers %X\n", address);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
171 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
172 } else if (address < 0x11A100) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
173 if (address < 0x110000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
174 //GPU Local RAM
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
175 uint32_t offset = address >> 2 & (GPU_RAM_BYTES / sizeof(uint32_t) - 1);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
176 if (address & 2) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
177 return system->gpu_local[offset];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
178 } else {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
179 return system->gpu_local[offset] >> 16;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
180 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
181 } else if (address < 0x114000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
182 //timer clock registers
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
183 fprintf(stderr, "Unhandled read from timer/clock registers - %X\n", address);
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
184 } else {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
185 //joystick interface
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
186 fprintf(stderr, "Unhandled read from joystick interface - %X\n", address);
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
187 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
188 } else if (address < 0x11B000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
189 //DSP/DAC/I2S Registers
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
190 fprintf(stderr, "Unhandled read from DSP/DAC/I2S registers - %X\n", address);
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
191 } else if (address < 0x11D000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
192 //DSP local RAM
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
193 uint32_t offset = address >> 2 & (DSP_RAM_BYTES / sizeof(uint32_t) - 1);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
194 if (address & 2) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
195 return system->dsp_local[offset];
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
196 } else {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
197 return system->dsp_local[offset] >> 16;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
198 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
199 } else {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
200 //Wave table ROM
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
201 fprintf(stderr, "Unhandled read from wave table ROM - %X\n", address);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
202 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
203 return 0xFFFF;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
204 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
205
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
206
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
207 void *rom0_write_m68k(uint32_t address, void *context, uint16_t value)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
208 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
209 rom0_write_16(address, ((m68k_context *)context)->system, value);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
210 return context;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
211 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
212
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
213 uint16_t rom0_read_m68k(uint32_t address, void *context)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
214 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
215 return rom0_read_16(address, ((m68k_context *)context)->system);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
216 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
217
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
218 void *rom0_write_m68k_b(uint32_t address, void *context, uint8_t value)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
219 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
220 //seems unlikely these areas support byte access
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
221 uint16_t value16 = value;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
222 value16 |= value16 << 8;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
223 rom0_write_16(address, ((m68k_context *)context)->system, value16);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
224 return context;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
225 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
226
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
227 uint8_t rom0_read_m68k_b(uint32_t address, void *context)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
228 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
229 uint16_t value = rom0_read_16(address, ((m68k_context *)context)->system);
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
230 if (address & 1) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
231 return value;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
232 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
233 return value >> 8;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
234 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
235
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
236 m68k_context * sync_components(m68k_context * context, uint32_t address)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
237 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
238 if (context->current_cycle > 0x10000000) {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
239 context->current_cycle -= 0x10000000;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
240 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
241 return context;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
242 }
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
243
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
244 m68k_context *handle_m68k_reset(m68k_context *context)
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
245 {
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
246 puts("M68K executed RESET");
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
247 return context;
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
248 }
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
249
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
250 jaguar_context *init_jaguar(uint16_t *bios, uint32_t bios_size, uint16_t *cart, uint32_t cart_size)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
251 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
252 jaguar_context *system = calloc(1, sizeof(jaguar_context));
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
253 system->bios = bios;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
254 system->bios_size = bios_size;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
255 system->cart = cart;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
256 system->cart_size = cart_size;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
257
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
258 memmap_chunk *jag_m68k_map = calloc(8, sizeof(memmap_chunk));
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
259 for (uint32_t start = 0, index=0; index < 8; index++, start += 0x200000)
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
260 {
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
261 jag_m68k_map[index].start = start;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
262 jag_m68k_map[index].end = start + 0x200000;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
263 jag_m68k_map[index].mask = index ? 0x1FFFFF : 0xFFFFFF;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
264 jag_m68k_map[index].aux_mask = bios_size - 1;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
265 jag_m68k_map[index].ptr_index = index;
1083
f6e998227300 Byteswap ROMs in jaguar ROM loader. Handle switching memory map from writes to memcon1. Fix some typos in error messages
Michael Pavone <pavone@retrodev.com>
parents: 1080
diff changeset
266 jag_m68k_map[index].flags = MMAP_READ | MMAP_WRITE | MMAP_PTR_IDX | MMAP_FUNC_NULL | MMAP_AUX_BUFF | MMAP_CODE;
1080
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
267 jag_m68k_map[index].buffer = bios;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
268 jag_m68k_map[index].read_16 = rom0_read_m68k;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
269 jag_m68k_map[index].read_8 = rom0_read_m68k_b;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
270 jag_m68k_map[index].write_16 = rom0_write_m68k;
382614130914 Some initial work on Atari Jaguar emulation
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
271 jag_m68k_map[index].write_8 = rom0_write_m68k_b;
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272 }
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273 m68k_options *opts = malloc(sizeof(m68k_options));
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274 init_m68k_opts(opts, jag_m68k_map, 8, 2);
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275 system->m68k = init_68k_context(opts, handle_m68k_reset);
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276 system->m68k->system = system;
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277 return system;
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278 }
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279
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280 //modified copy of the version in blastem.c
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281 uint16_t *load_rom(char * filename, uint32_t *size)
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282 {
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283 FILE * f = fopen(filename, "rb");
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284 if (!f) {
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285 return 0;
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286 }
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287 fseek(f, 0, SEEK_END);
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288 long filesize = ftell(f);
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289 fseek(f, 0, SEEK_SET);
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290
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291 *size = nearest_pow2(filesize);
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292 uint16_t *cart = malloc(*size);
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293 if (filesize != fread(cart, 1, filesize, f)) {
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294 fatal_error("Error reading from %s\n", filename);
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295 }
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296 filesize = (filesize + 1) & ~1L;
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297 for (long i = 0; i < filesize; i+=2)
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298 {
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299 long index = i >> 1;
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300 cart[index] = cart[index] >> 8 | cart[index] << 8;
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301 }
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302 while (filesize < *size)
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303 {
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304 cart[filesize / 2] = 0xFFFF;
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305 filesize += 2;
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306 }
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307 fclose(f);
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308 return cart;
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309 }
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310
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311 //temporary main function until I clean up blastem.c
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312 int main(int argc, char **argv)
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313 {
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314 if (argc < 3) {
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315 fputs("Usage: blastjag BIOS ROM\n", stderr);
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316 return 1;
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317 }
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318 uint32_t bios_size;
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319 uint16_t *bios = load_rom(argv[1], &bios_size);
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320 if (!bios_size) {
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321 fatal_error("Failed to read BIOS from %s\n", argv[1]);
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322 }
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323 uint32_t cart_size;
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324 uint16_t *cart = load_rom(argv[2], &cart_size);
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325 if (!bios_size) {
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326 fatal_error("Failed to read cart from %s\n", argv[2]);
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327 }
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328 jaguar_context *system = init_jaguar(bios, bios_size, cart, cart_size);
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329 m68k_reset(system->m68k);
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330 return 0;
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331 }