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Copy pathStageMEM.cpp
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249 lines (198 loc) · 7.84 KB
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#ifndef VM_Stage_MEM
#define VM_Stage_MEM
#include <stdint.h>
#include "Common.hpp"
#include "HwError.hpp"
#include "Component.hpp"
#include "Pipeline.hpp"
#include "Memory.cpp"
namespace Stage
{
class MEM : public Component::Component_t
{
private:
Component::MemoryAccess * Mem = nullptr;
public:
MEM( Component::MemoryAccess * mem )
{
Mem = mem;
}
MEM(){}
void SetMemoryAccess( Component::MemoryAccess * mem )
{
Mem = mem;
}
Component::Component_ID GetID()
{
return Component::Component_ID_StageMEM;
}
HwError Setup() override
{
return HwError_NoError;
}
Pipeline_MEMtoWB Perform( Pipeline_EXtoMEM pipe )
{
Pipeline_MEMtoWB Result;
Result.Reset();
Result.CopyFromLast( pipe );
SetLastHwError( HwError_NoError );
if( pipe.MEMParams.DoMemRead )
{
static void * DispatchTable[] = { &&Read_Byte, &&Read_HWord, &&Read_Word, &&Read_DWord };
if( Mem == nullptr )
{
SetLastHwError( HwError_MemoryAccessMissing );
return Result;
}
uint64_t Address = pipe.MEMParams.Address;
bool SignExtend = pipe.MEMParams.SignExtend != 0;
uint8_t MemSize = pipe.MEMParams.MemSize;
if( MemSize < 4 )
goto *DispatchTable[MemSize];
else
{
Result.SetWBVal( 1, 0 );
SetLastHwError( HwError_Pipeline_InvalidMemSize );
}
Read_Byte:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 1 );
if( MemIsGood )
{
uint8_t Val = Mem->GetByte( Address );
Result.SetWBVal( 1, ExtendByte( Val, SignExtend ) );
}
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastRead;
};
Read_HWord:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 2 );
if( MemIsGood )
{
uint16_t Val = Mem->GetHWord( Address );
Result.SetWBVal( 1, ExtendHWord( Val, SignExtend ) );
}
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastRead;
};
Read_Word:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 4 );
if( MemIsGood )
{
uint32_t Val = Mem->GetWord( Address );
Result.SetWBVal( 1, ExtendWord( Val, SignExtend ) );
}
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastRead;
};
Read_DWord:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 8 );
if( MemIsGood )
{
uint64_t Val = Mem->GetDWord( Address );
Result.SetWBVal( 1, Val );
}
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastRead;
};
}
BreakPastRead:
if( pipe.MEMParams.DoMemWrite )
{
static void * DispatchTable[] = { &&Write_Byte, &&Write_HWord, &&Write_Word, &&Write_DWord };
if( Mem == nullptr )
{
SetLastHwError( HwError_MemoryAccessMissing );
return Result;
}
uint64_t Address = pipe.MEMParams.Address;
uint8_t MemSize = pipe.MEMParams.MemSize;
uint64_t WriteVal = pipe.MEMParams.WriteVal;
if( MemSize < 4 )
goto *DispatchTable[MemSize];
else
{
SetLastHwError( HwError_Pipeline_InvalidMemSize );
}
Write_Byte:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 1 );
if( MemIsGood )
Mem->SetByte( Address, (uint8_t) (WriteVal & 0xff) );
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastWrite;
}
Write_HWord:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 2 );
if( MemIsGood )
Mem->SetHWord( Address, (uint16_t) (WriteVal & 0xffff) );
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastWrite;
}
Write_Word:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 4 );
if( MemIsGood )
Mem->SetWord( Address, (uint32_t) (WriteVal & 0xffffffff) );
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastWrite;
}
Write_DWord:
{
bool MemIsGood = Mem->CheckAccessibility( Address, 8 );
if( MemIsGood )
Mem->SetDWord( Address, WriteVal );
else
{
SetLastHwError( HwError_CannotAccessMemory );
return Result;
}
SetLastHwError( Mem->LastHwError() );
goto BreakPastWrite;
}
}
BreakPastWrite:
return Result;
}
};
};
#endif