diff options
Diffstat (limited to 'backend.c')
| -rw-r--r-- | backend.c | 32 |
1 files changed, 32 insertions, 0 deletions
@@ -154,6 +154,38 @@ uint16_t read_word(uint32_t address, void **mem_pointers, cpu_options *opts, voi return 0xFFFF; } +void write_word(uint32_t address, uint16_t value, void **mem_pointers, cpu_options *opts, void *context) +{ + memmap_chunk const *chunk = find_map_chunk(address, opts, 0, NULL); + if (!chunk) { + return; + } + uint32_t offset = (address - chunk->start) & chunk->mask; + if (chunk->flags & MMAP_WRITE) { + uint8_t *base; + if (chunk->flags & MMAP_PTR_IDX) { + base = mem_pointers[chunk->ptr_index]; + } else { + base = chunk->buffer; + } + if (base) { + if ((chunk->flags & MMAP_ONLY_ODD) || (chunk->flags & MMAP_ONLY_EVEN)) { + offset /= 2; + if (chunk->flags & MMAP_ONLY_EVEN) { + value >>= 16; + } + base[offset] = value; + } else { + *(uint16_t *)(base + offset) = value; + } + return; + } + } + if ((!(chunk->flags & MMAP_WRITE) || (chunk->flags & MMAP_FUNC_NULL)) && chunk->write_16) { + chunk->write_16(offset, context, value); + } +} + uint8_t read_byte(uint32_t address, void **mem_pointers, cpu_options *opts, void *context) { memmap_chunk const *chunk = find_map_chunk(address, opts, 0, NULL); |