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snes: faker system bus (ram only) for determinstic mode)

This commit is contained in:
goyuken 2014-09-08 15:43:34 +00:00
parent 93eb656eba
commit 7a25e05189
1 changed files with 48 additions and 1 deletions
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49
BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesCore.cs
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@ -1009,6 +1009,47 @@ namespace BizHawk.Emulation.Cores.Nintendo.SNES
public CoreComm CoreComm { get; private set; }
// works for WRAM, garbage for anything else
static int? FakeBusMap(int addr)
{
addr &= 0xffffff;
int bank = addr >> 16;
if (bank == 0x7e || bank == 0x7f)
return addr & 0x1ffff;
bank &= 0x7f;
int low = addr & 0xffff;
if (bank < 0x40 && low < 0x2000)
return low;
return null;
}
unsafe void MakeFakeBus()
{
int size = api.QUERY_get_memory_size(LibsnesApi.SNES_MEMORY.WRAM);
if (size != 0x20000)
throw new InvalidOperationException();
byte* blockptr = api.QUERY_get_memory_data(LibsnesApi.SNES_MEMORY.WRAM);
var md = new MemoryDomain("BUS", 0x1000000, MemoryDomain.Endian.Little,
(addr) =>
{
var a = FakeBusMap(addr);
if (a.HasValue)
return blockptr[a.Value];
else
return 0;
},
(addr, val) =>
{
var a = FakeBusMap(addr);
if (a.HasValue)
blockptr[a.Value] = val;
});
_memoryDomains.Add(md);
}
// ----- Client Debugging API stuff -----
unsafe MemoryDomain MakeMemoryDomain(string name, LibsnesApi.SNES_MEMORY id, MemoryDomain.Endian endian)
{
@ -1093,10 +1134,16 @@ namespace BizHawk.Emulation.Cores.Nintendo.SNES
MakeMemoryDomain("APURAM", LibsnesApi.SNES_MEMORY.APURAM, MemoryDomain.Endian.Little);
if (!DeterministicEmulation)
{
_memoryDomains.Add(new MemoryDomain("BUS", 0x1000000, MemoryDomain.Endian.Little,
(addr) => api.QUERY_peek(LibsnesApi.SNES_MEMORY.SYSBUS, (uint)addr),
(addr, val) => api.QUERY_poke(LibsnesApi.SNES_MEMORY.SYSBUS, (uint)addr, val)));
}
else
{
// limited function bus
MakeFakeBus();
}
}
MemoryDomains = new MemoryDomainList(_memoryDomains);