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more sensible cache timings

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(still a big fat hack)
This commit is contained in:
StapleButter
2018-12-11 17:59:52 +01:00
parent e4c6ac55d2
commit 4aafdee14d
3 changed files with 17 additions and 6 deletions
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16
src/CP15.cpp
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@ -27,8 +27,9 @@
// this was measured to be close to hardware average
// a value of 1 would represent a perfect cache, but that causes
// games to run too fast, causing a number of issues
// code cache timing can get as low as 3
const int kDataCacheTiming = 2;
const int kCodeCacheTiming = 2;
const int kCodeCacheTiming = 5;
void ARMv5::CP15Reset()
@ -241,7 +242,7 @@ void ARMv5::UpdateRegionTimings(u32 addrstart, u32 addrend)
if (pu & 0x40)
{
MemTimings[i][0] = kCodeCacheTiming;
MemTimings[i][0] = 0xFF;//kCodeCacheTiming;
}
else
{
@ -252,7 +253,7 @@ void ARMv5::UpdateRegionTimings(u32 addrstart, u32 addrend)
{
MemTimings[i][1] = kDataCacheTiming;
MemTimings[i][2] = kDataCacheTiming;
MemTimings[i][3] = kDataCacheTiming;
MemTimings[i][3] = 1;
}
else
{
@ -511,9 +512,18 @@ u32 ARMv5::CodeRead32(u32 addr)
{
if (addr < ITCMSize)
{
CodeCycles = 1;
return *(u32*)&ITCM[addr & 0x7FFF];
}
CodeCycles = RegionCodeCycles;
if (CodeCycles == 0xFF)
{
// sort of code cache hit/miss average
if (!(addr & 0x1F)) CodeCycles = kCodeCacheTiming;
else CodeCycles = 1;
}
if (CodeMem.Mem) return *(u32*)&CodeMem.Mem[addr & CodeMem.Mask];
return NDS::ARM9Read32(addr);