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Updated C bit on TLB cache hits.

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Added TLB state to the save state file.
This commit is contained in:
skidau
2014-12-05 14:29:13 +11:00
parent 6d5e9cb5b1
commit 693f413364
5 changed files with 69 additions and 53 deletions
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84
Source/Core/Core/HW/MemmapFunctions.cpp
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@ -704,31 +704,9 @@ void SDRUpdated()
}
// TLB cache
#define TLB_SIZE 128
#define TLB_WAYS 2
#define NUM_TLBS 2
#define HW_PAGE_INDEX_SHIFT 12
#define HW_PAGE_INDEX_MASK 0x3f
#define HW_PAGE_TAG_SHIFT 18
#define TLB_FLAG_MOST_RECENT 0x01
#define TLB_FLAG_INVALID 0x02
struct tlb_entry
{
u32 tag;
u32 paddr;
u8 flags;
};
// TODO: tlb needs to be in ppcState for save-state purposes.
static tlb_entry tlb[NUM_TLBS][TLB_SIZE/TLB_WAYS][TLB_WAYS];
static u32 LookupTLBPageAddress(const XCheckTLBFlag _Flag, const u32 vpa, u32 *paddr)
{
tlb_entry *tlbe = tlb[_Flag == FLAG_OPCODE][(vpa>>HW_PAGE_INDEX_SHIFT)&HW_PAGE_INDEX_MASK];
PowerPC::tlb_entry *tlbe = PowerPC::ppcState.tlb[_Flag == FLAG_OPCODE][(vpa >> HW_PAGE_INDEX_SHIFT) & HW_PAGE_INDEX_MASK];
if (tlbe[0].tag == (vpa & ~0xfff) && !(tlbe[0].flags & TLB_FLAG_INVALID))
{
if (_Flag != FLAG_NO_EXCEPTION)
@ -736,7 +714,19 @@ static u32 LookupTLBPageAddress(const XCheckTLBFlag _Flag, const u32 vpa, u32 *p
tlbe[0].flags |= TLB_FLAG_MOST_RECENT;
tlbe[1].flags &= ~TLB_FLAG_MOST_RECENT;
}
*paddr = tlbe[0].paddr | (vpa & 0xfff);
// Check if C bit requires updating
if (_Flag == FLAG_WRITE)
{
u8* pRAM = Memory::base;
UPTE2 PTE2;
PTE2.Hex = bswap((*(u32*)&pRAM[tlbe[0].pteg]));
if (PTE2.C == 0)
return 0;
}
return 1;
}
if (tlbe[1].tag == (vpa & ~0xfff) && !(tlbe[1].flags & TLB_FLAG_INVALID))
@ -746,23 +736,36 @@ static u32 LookupTLBPageAddress(const XCheckTLBFlag _Flag, const u32 vpa, u32 *p
tlbe[1].flags |= TLB_FLAG_MOST_RECENT;
tlbe[0].flags &= ~TLB_FLAG_MOST_RECENT;
}
*paddr = tlbe[1].paddr | (vpa & 0xfff);
// Check if C bit requires updating
if (_Flag == FLAG_WRITE)
{
u8* pRAM = Memory::base;
UPTE2 PTE2;
PTE2.Hex = bswap((*(u32*)&pRAM[tlbe[1].pteg]));
if (PTE2.C == 0)
return 0;
}
return 1;
}
return 0;
}
static void UpdateTLBEntry(const XCheckTLBFlag _Flag, UPTE2 PTE2, const u32 vpa)
static void UpdateTLBEntry(const XCheckTLBFlag _Flag, UPTE2 PTE2, const u32 vpa, const u32 pteg)
{
if (_Flag == FLAG_NO_EXCEPTION)
return;
tlb_entry *tlbe = tlb[_Flag == FLAG_OPCODE][(vpa>>HW_PAGE_INDEX_SHIFT)&HW_PAGE_INDEX_MASK];
if ((tlbe[0].flags & TLB_FLAG_MOST_RECENT) == 0)
PowerPC::tlb_entry *tlbe = PowerPC::ppcState.tlb[_Flag == FLAG_OPCODE][(vpa >> HW_PAGE_INDEX_SHIFT) & HW_PAGE_INDEX_MASK];
if ((tlbe[0].flags & TLB_FLAG_MOST_RECENT) == 0 || (tlbe[0].flags & TLB_FLAG_INVALID))
{
tlbe[0].flags = TLB_FLAG_MOST_RECENT;
tlbe[1].flags &= ~TLB_FLAG_MOST_RECENT;
tlbe[0].paddr = PTE2.RPN << HW_PAGE_INDEX_SHIFT;
tlbe[0].pteg = pteg;
tlbe[0].tag = vpa & ~0xfff;
}
else
@ -770,13 +773,14 @@ static void UpdateTLBEntry(const XCheckTLBFlag _Flag, UPTE2 PTE2, const u32 vpa)
tlbe[1].flags = TLB_FLAG_MOST_RECENT;
tlbe[0].flags &= ~TLB_FLAG_MOST_RECENT;
tlbe[1].paddr = PTE2.RPN << HW_PAGE_INDEX_SHIFT;
tlbe[1].pteg = pteg;
tlbe[1].tag = vpa & ~0xfff;
}
}
void InvalidateTLBEntry(u32 vpa)
{
tlb_entry *tlbe = tlb[0][(vpa>>HW_PAGE_INDEX_SHIFT)&HW_PAGE_INDEX_MASK];
PowerPC::tlb_entry *tlbe = PowerPC::ppcState.tlb[0][(vpa >> HW_PAGE_INDEX_SHIFT) & HW_PAGE_INDEX_MASK];
if (tlbe[0].tag == (vpa & ~0xfff))
{
tlbe[0].flags |= TLB_FLAG_INVALID;
@ -785,7 +789,7 @@ void InvalidateTLBEntry(u32 vpa)
{
tlbe[1].flags |= TLB_FLAG_INVALID;
}
tlb_entry *tlbe_i = tlb[1][(vpa>>HW_PAGE_INDEX_SHIFT)&HW_PAGE_INDEX_MASK];
PowerPC::tlb_entry *tlbe_i = PowerPC::ppcState.tlb[1][(vpa >> HW_PAGE_INDEX_SHIFT) & HW_PAGE_INDEX_MASK];
if (tlbe_i[0].tag == (vpa & ~0xfff))
{
tlbe_i[0].flags |= TLB_FLAG_INVALID;
@ -832,8 +836,6 @@ static u32 TranslatePageAddress(const u32 _Address, const XCheckTLBFlag _Flag)
UPTE2 PTE2;
PTE2.Hex = bswap((*(u32*)&pRAM[(pteg_addr + 4)]));
UpdateTLBEntry(_Flag, PTE2, _Address);
// set the access bits
switch (_Flag)
{
@ -842,12 +844,16 @@ static u32 TranslatePageAddress(const u32 _Address, const XCheckTLBFlag _Flag)
case FLAG_NO_EXCEPTION: break;
case FLAG_OPCODE: break;
}
*(u32*)&pRAM[(pteg_addr + 4)] = bswap(PTE2.Hex);
return ((PTE2.RPN << 12) | offset);
if (_Flag != FLAG_NO_EXCEPTION)
*(u32*)&pRAM[(pteg_addr + 4)] = bswap(PTE2.Hex);
UpdateTLBEntry(_Flag, PTE2, _Address, pteg_addr + 4);
return (PTE2.RPN << 12) | offset;
}
}
pteg_addr+=8;
pteg_addr += 8;
}
// hash function no 2 "not" .360
@ -863,8 +869,6 @@ static u32 TranslatePageAddress(const u32 _Address, const XCheckTLBFlag _Flag)
UPTE2 PTE2;
PTE2.Hex = bswap((*(u32*)&pRAM[(pteg_addr + 4)]));
UpdateTLBEntry(_Flag, PTE2, _Address);
switch (_Flag)
{
case FLAG_READ: PTE2.R = 1; break;
@ -872,12 +876,16 @@ static u32 TranslatePageAddress(const u32 _Address, const XCheckTLBFlag _Flag)
case FLAG_NO_EXCEPTION: break;
case FLAG_OPCODE: break;
}
*(u32*)&pRAM[(pteg_addr + 4)] = bswap(PTE2.Hex);
return ((PTE2.RPN << 12) | offset);
if (_Flag != FLAG_NO_EXCEPTION)
*(u32*)&pRAM[(pteg_addr + 4)] = bswap(PTE2.Hex);
UpdateTLBEntry(_Flag, PTE2, _Address, pteg_addr + 4);
return (PTE2.RPN << 12) | offset;
}
}
pteg_addr+=8;
pteg_addr += 8;
}
return 0;
}