Mercurial > repos > blastem
diff backend.c @ 653:a18e3923481e
Remove some of the hard coded assumptions about the memory map from the CPU cores
author | Michael Pavone <pavone@retrodev.com> |
---|---|
date | Thu, 01 Jan 2015 14:36:55 -0800 |
parents | dc9f178085a0 |
children | 98927f1b005b |
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--- a/backend.c Tue Dec 30 19:11:34 2014 -0800 +++ b/backend.c Thu Jan 01 14:36:55 2015 -0800 @@ -51,3 +51,24 @@ } } +void * get_native_pointer(uint32_t address, void ** mem_pointers, cpu_options * opts) +{ + memmap_chunk * memmap = opts->memmap; + address &= opts->address_mask; + for (uint32_t chunk = 0; chunk < opts->memmap_chunks; chunk++) + { + if (address >= memmap[chunk].start && address < memmap[chunk].end) { + if (!(memmap[chunk].flags & MMAP_READ)) { + return NULL; + } + uint8_t * base = memmap[chunk].flags & MMAP_PTR_IDX + ? mem_pointers[memmap[chunk].ptr_index] + : memmap[chunk].buffer; + if (!base) { + return NULL; + } + return base + (address & memmap[chunk].mask); + } + } + return NULL; +}