project64/Source/Project64/N64 System/Mips/TLB Class.h

141 lines
3.1 KiB
C++

class CDebugTlb;
class CTLB_CB
{
public:
virtual void TLB_Mapped ( DWORD VAddr, DWORD Len, DWORD PAddr, bool bReadOnly ) = 0;
virtual void TLB_Unmaped ( DWORD VAddr, DWORD Len ) = 0;
virtual void TLB_Changed ( void ) = 0;
};
class CTLB :
protected CSystemRegisters
{
public:
typedef struct {
bool EntryDefined;
union {
unsigned long Value;
unsigned char A[4];
struct {
unsigned zero : 13;
unsigned Mask : 12;
unsigned zero2 : 7;
} ;
} PageMask;
union {
unsigned long Value;
unsigned char A[4];
struct {
unsigned ASID : 8;
unsigned Zero : 4;
unsigned G : 1;
unsigned VPN2 : 19;
};
} EntryHi;
union {
unsigned long Value;
unsigned char A[4];
struct {
unsigned GLOBAL: 1;
unsigned V : 1;
unsigned D : 1;
unsigned C : 3;
unsigned PFN : 20;
unsigned ZERO: 6;
} ;
} EntryLo0;
union {
unsigned long Value;
unsigned char A[4];
struct {
unsigned GLOBAL: 1;
unsigned V : 1;
unsigned D : 1;
unsigned C : 3;
unsigned PFN : 20;
unsigned ZERO: 6;
} ;
} EntryLo1;
} TLB_ENTRY;
private:
typedef struct {
DWORD VSTART;
DWORD VEND;
DWORD PHYSSTART;
DWORD PHYSEND;
DWORD Length;
bool VALID;
bool DIRTY;
bool GLOBAL;
bool ValidEntry;
bool Random;
bool Probed;
} FASTTLB;
//friend CC_Core;
friend CDebugTlb; // enable debug window to read class
CTLB_CB * const m_CB;
TLB_ENTRY m_tlb[32];
FASTTLB m_FastTlb[64];
void SetupTLB_Entry ( int index, bool Random );
public:
CTLB ( CTLB_CB * CallBack );
~CTLB ( void );
void Reset ( bool InvalidateTLB );
//Used by opcodes of the same name to manipulate the tlb (reads the registers)
void Probe ( void );
void ReadEntry ( void );
void WriteEntry ( int index, bool Random );
//See if a VAddr has an entry to translate to a PAddr
bool AddressDefined ( DWORD VAddr );
const TLB_ENTRY & TlbEntry ( int Entry) const { return m_tlb[Entry]; }
bool PAddrToVAddr ( DWORD PAddr, DWORD & VAddr, DWORD & Index );
//Change the Virtual address to a Phyiscal Address
/*inline bool TranslateVaddr ( DWORD VAddr, DWORD &PAddr) const
{
//Change the Virtual address to a Phyiscal Address
if (TLB_ReadMap[VAddr >> 12] == 0) { return false; }
PAddr = (DWORD)((BYTE *)(TLB_ReadMap[VAddr >> 12] + VAddr) - m_BasePAddr);
return true;
}
inline DWORD TranslateVaddr ( DWORD VAddr ) const
{
//Change the Virtual address to a Phyiscal Address
return (DWORD)((BYTE *)(TLB_ReadMap[VAddr >> 12] + VAddr) - m_BasePAddr);
}
//Change the Virtual address to a pointer to the physical address in memory
bool VAddrToRealAddr ( DWORD VAddr, void * &RealAddress );
// Find a matching Virtual Addres from a phyiscal one
bool PAddrToVAddr ( DWORD PAddr, DWORD & VAddr, DWORD & Index );
//see if the Vaddr is valid
inline bool ValidVaddr ( DWORD VAddr ) const { return TLB_ReadMap[VAddr >> 12] != 0; }
*/
};