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comparison backend.c @ 744:fc68992cf18d

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Merge windows branch with latest changes
author Michael Pavone <pavone@retrodev.com>
date Thu, 28 May 2015 21:19:55 -0700
parents fc04781f4d28
children 329ff62ea391
comparison
equal deleted inserted replaced
743:cf78cb045fa4 744:fc68992cf18d
49 cur = cur->next; 49 cur = cur->next;
50 } 50 }
51 } 51 }
52 } 52 }
53 53
54 void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts)
55 {
56 memmap_chunk const * memmap = opts->memmap;
57 address &= opts->address_mask;
58 for (uint32_t chunk = 0; chunk < opts->memmap_chunks; chunk++)
59 {
60 if (address >= memmap[chunk].start && address < memmap[chunk].end) {
61 if (!(memmap[chunk].flags & MMAP_READ)) {
62 return NULL;
63 }
64 uint8_t * base = memmap[chunk].flags & MMAP_PTR_IDX
65 ? mem_pointers[memmap[chunk].ptr_index]
66 : memmap[chunk].buffer;
67 if (!base) {
68 return NULL;
69 }
70 return base + (address & memmap[chunk].mask);
71 }
72 }
73 return NULL;
74 }
75
76 uint32_t chunk_size(cpu_options *opts, memmap_chunk const *chunk)
77 {
78 if (chunk->mask == opts->address_mask) {
79 return chunk->end - chunk->start;
80 } else {
81 return chunk->mask + 1;
82 }
83 }
84
85 uint32_t ram_size(cpu_options *opts)
86 {
87 uint32_t size = 0;
88 for (int i = 0; i < opts->memmap_chunks; i++)
89 {
90 if ((opts->memmap[i].flags & (MMAP_WRITE | MMAP_CODE)) == (MMAP_WRITE | MMAP_CODE)) {
91 if (opts->memmap[i].mask == opts->address_mask) {
92 size += opts->memmap[i].end - opts->memmap[i].start;
93 } else {
94 size += opts->memmap[i].mask + 1;
95 }
96 }
97 }
98 return size;
99 }