1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
#import "GBMemoryByteArray.h"
#import "GBCompleteByteSlice.h"
@implementation GBMemoryByteArray
{
Document *_document;
}
- (instancetype) initWithDocument:(Document *)document
{
if ((self = [super init])) {
_document = document;
}
return self;
}
- (unsigned long long)length
{
switch (_mode) {
case GBMemoryEntireSpace:
return 0x10000;
case GBMemoryROM:
return 0x8000;
case GBMemoryVRAM:
return 0x2000;
case GBMemoryExternalRAM:
return 0x2000;
case GBMemoryRAM:
return 0x2000;
}
}
- (uint16_t)base
{
switch (_mode) {
case GBMemoryEntireSpace: return 0;
case GBMemoryROM: return 0;
case GBMemoryVRAM: return 0x8000;
case GBMemoryExternalRAM: return 0xA000;
case GBMemoryRAM: return 0xC000;
}
}
- (void)copyBytes:(unsigned char *)dst range:(HFRange)range
{
// Do everything in 0x1000 chunks, never cross a 0x1000 boundary
if ((range.location & 0xF000) != ((range.location + range.length) & 0xF000)) {
size_t partial = 0x1000 - (range.location & 0xFFF);
[self copyBytes:dst + partial range:HFRangeMake(range.location + partial, range.length - partial)];
range.length = partial;
}
range.location += self.base;
GB_gameboy_t *gb = _document.gameboy;
switch (range.location >> 12) {
case 0x0:
case 0x1:
case 0x2:
case 0x3: {
uint16_t bank;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_ROM0, NULL, &bank);
memcpy(dst, data + bank * 0x4000 + range.location, range.length);
break;
}
case 0x4:
case 0x5:
case 0x6:
case 0x7: {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_ROM, &size, &bank);
if (_mode != GBMemoryEntireSpace) {
bank = self.selectedBank & (size / 0x4000 - 1);
}
memcpy(dst, data + bank * 0x4000 + range.location - 0x4000, range.length);
break;
}
case 0x8:
case 0x9: {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_VRAM, &size, &bank);
if (_mode != GBMemoryEntireSpace) {
bank = self.selectedBank & (size / 0x2000 - 1);
}
memcpy(dst, data + bank * 0x2000 + range.location - 0x8000, range.length);
break;
}
case 0xA:
case 0xB: {
// Some carts are special, use memory read directly in full mem mode
if (_mode == GBMemoryEntireSpace) {
case 0xF:
slow_path:
[_document performAtomicBlock:^{
for (unsigned i = 0; i < range.length; i++) {
dst[i] = GB_safe_read_memory(gb, range.location + i);
}
}];
break;
}
else {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_CART_RAM, &size, &bank);
bank = self.selectedBank & (size / 0x2000 - 1);
if (size == 0) {
memset(dst, 0xFF, range.length);
}
else if (range.location + range.length - 0xA000 > size) {
goto slow_path;
}
else {
memcpy(dst, data + bank * 0x2000 + range.location - 0xA000, range.length);
}
break;
}
}
case 0xC:
case 0xE: {
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_RAM, NULL, NULL);
memcpy(dst, data + (range.location & 0xFFF), range.length);
break;
}
case 0xD: {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_RAM, &size, &bank);
if (_mode != GBMemoryEntireSpace) {
bank = self.selectedBank & (size / 0x1000 - 1);
}
memcpy(dst, data + bank * 0x1000 + range.location - 0xD000, range.length);
break;
}
}
}
- (NSArray *)byteSlices
{
return @[[[GBCompleteByteSlice alloc] initWithByteArray:self]];
}
- (HFByteArray *)subarrayWithRange:(HFRange)range
{
unsigned char arr[range.length];
[self copyBytes:arr range:range];
HFByteArray *ret = [[HFBTreeByteArray alloc] init];
HFFullMemoryByteSlice *slice = [[HFFullMemoryByteSlice alloc] initWithData:[NSData dataWithBytes:arr length:range.length]];
[ret insertByteSlice:slice inRange:HFRangeMake(0, 0)];
return ret;
}
- (void)insertByteSlice:(HFByteSlice *)slice inRange:(HFRange)range
{
if (slice.length != range.length) return; /* Insertion is not allowed, only overwriting. */
// Do everything in 0x1000 chunks, never cross a 0x1000 boundary
if ((range.location & 0xF000) != ((range.location + range.length) & 0xF000)) {
size_t partial = 0x1000 - (range.location & 0xFFF);
if (slice.length - partial) {
[self insertByteSlice:[slice subsliceWithRange:HFRangeMake(partial, slice.length - partial)]
inRange:HFRangeMake(range.location + partial, range.length - partial)];
}
range.length = partial;
}
range.location += self.base;
GB_gameboy_t *gb = _document.gameboy;
switch (range.location >> 12) {
case 0x0:
case 0x1:
case 0x2:
case 0x3:
case 0x4:
case 0x5:
case 0x6:
case 0x7: {
return; // ROM not writeable
}
case 0x8:
case 0x9: {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_VRAM, &size, &bank);
if (_mode != GBMemoryEntireSpace) {
bank = self.selectedBank & (size / 0x2000 - 1);
}
uint8_t sliceData[range.length];
[slice copyBytes:sliceData range:HFRangeMake(0, range.length)];
memcpy(data + bank * 0x2000 + range.location - 0x8000, sliceData, range.length);
break;
}
case 0xA:
case 0xB: {
// Some carts are special, use memory write directly in full mem mode
if (_mode == GBMemoryEntireSpace) {
case 0xF:
slow_path:
[_document performAtomicBlock:^{
uint8_t sliceData[range.length];
[slice copyBytes:sliceData range:HFRangeMake(0, range.length)];
for (unsigned i = 0; i < range.length; i++) {
GB_write_memory(gb, range.location + i, sliceData[i]);
}
}];
break;
}
else {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_CART_RAM, &size, &bank);
bank = self.selectedBank & (size / 0x2000 - 1);
if (size == 0) {
// Nothing to write to
}
else if (range.location + range.length - 0xA000 > size) {
goto slow_path;
}
else {
uint8_t sliceData[range.length];
[slice copyBytes:sliceData range:HFRangeMake(0, range.length)];
memcpy(data + bank * 0x2000 + range.location - 0xA000, sliceData, range.length);
}
break;
}
}
case 0xC:
case 0xE: {
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_RAM, NULL, NULL);
uint8_t sliceData[range.length];
[slice copyBytes:sliceData range:HFRangeMake(0, range.length)];
memcpy(data + (range.location & 0xFFF), sliceData, range.length);
break;
}
case 0xD: {
uint16_t bank;
size_t size;
uint8_t *data = GB_get_direct_access(gb, GB_DIRECT_ACCESS_RAM, &size, &bank);
if (_mode != GBMemoryEntireSpace) {
bank = self.selectedBank & (size / 0x1000 - 1);
}
uint8_t sliceData[range.length];
[slice copyBytes:sliceData range:HFRangeMake(0, range.length)];
memcpy(data + bank * 0x1000 + range.location - 0xD000, sliceData, range.length);
break;
}
}
}
@end
|
