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annotate multi_game.c @ 1925:039553703c20

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Don't apply address and cd register changes to the 'live' registers until pending flag is cleared, but do preserve the upper address bits in the latch. Fixes regression in Overdrive 2 while preserving fix to Mona in 344 bytes
author Michael Pavone <pavone@retrodev.com>
date Mon, 13 Apr 2020 20:43:25 -0700
parents adb62000d296
children d74d3998482c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "genesis.h"
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2
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3 void *write_multi_game_b(uint32_t address, void *vcontext, uint8_t value)
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4 {
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5 m68k_context *context = vcontext;
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6 genesis_context *gen = context->system;
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7 gen->bank_regs[0] = address;
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8 uint32_t base = (address & 0x3F) << 16, start = 0, end = 0x400000;
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9 //find the memmap chunk, so we can properly mask the base value
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10 for (int i = 0; i < context->options->gen.memmap_chunks; i++)
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11 {
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12 if (context->options->gen.memmap[i].flags & MMAP_PTR_IDX) {
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13 base &= context->options->gen.memmap[i].mask;
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14 start = context->options->gen.memmap[i].start;
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15 end = context->options->gen.memmap[i].end;
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16 break;
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17 }
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18 }
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19 context->mem_pointers[gen->mapper_start_index] = gen->cart + base/2;
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20 m68k_invalidate_code_range(context, start, end);
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21 return vcontext;
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22 }
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23
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24 void *write_multi_game_w(uint32_t address, void *context, uint16_t value)
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25 {
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26 return write_multi_game_b(address, context, value);
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27 }
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29 void multi_game_serialize(genesis_context *gen, serialize_buffer *buf)
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30 {
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31 save_int8(buf, gen->bank_regs[0]);
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32 }
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33
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34 void multi_game_deserialize(deserialize_buffer *buf, genesis_context *gen)
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35 {
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36 write_multi_game_b(load_int8(buf), gen->m68k, 0);
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37 }