81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
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#include "math64.h"
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#include "pxa255_DSP.h"
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Boolean pxa255dspAccess(struct ArmCpu* cpu, void* userData, Boolean MRRC, UInt8 op, UInt8 RdLo, UInt8 RdHi, UInt8 acc){
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Pxa255dsp* dsp = userData;
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if(acc != 0 || op != 0) return false; //bad encoding
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if(MRRC){ //MRA: read acc0
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cpuSetReg(cpu, RdLo, u64_64_to_32(dsp->acc0));
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cpuSetReg(cpu, RdHi, (UInt8)u64_get_hi(dsp->acc0));
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}
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else{ //MAR: write acc0
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dsp->acc0 = u64_from_halves(cpuGetRegExternal(cpu, RdHi) & 0xFF, cpuGetRegExternal(cpu, RdLo));
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}
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return true;
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}
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Boolean pxa255dspOp(struct ArmCpu* cpu, void* userData, Boolean two/* MCR2/MRC2 ? */, Boolean MRC, UInt8 op1, UInt8 Rs, UInt8 opcode_3, UInt8 Rm, UInt8 acc){
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Pxa255dsp* dsp = userData;
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UInt64 addend = u64_zero();
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UInt32 Vs, Vm;
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if(op1 != 1 || two || MRC || acc != 0) return false; //bad encoding
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Vs = cpuGetRegExternal(cpu, Rs);
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Vm = cpuGetRegExternal(cpu, Rm);
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switch(opcode_3 >> 2){
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case 0: //MIA
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addend = u64_smul3232(Vm, Vs);
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break;
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case 1: //invalid
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return false;
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case 2: //MIAPH
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addend = u64_smul3232((Int32)((Int16)(Vm >> 0)), (Int32)((Int16)(Vs >> 0)));
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addend = u64_add(addend, u64_smul3232((Int32)((Int16)(Vm >> 16)), (Int32)((Int16)(Vs >> 16))));
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break;
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case 3: //MIAxy
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if(opcode_3 & 2) Vm >>= 16; //X set
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if(opcode_3 & 1) Vs >>= 16; //Y set
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addend = u64_smul3232((Int32)((Int16)Vm), (Int32)((Int16)Vs));
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break;
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}
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dsp->acc0 = u64_and(u64_add(dsp->acc0, addend), u64_from_halves(0xFF, 0xFFFFFFFFUL));
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return true;
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}
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Boolean pxa255dspInit(Pxa255dsp* dsp, ArmCpu* cpu){
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ArmCoprocessor cp;
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__mem_zero(dsp, sizeof(Pxa255dsp));
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cp.regXfer = pxa255dspOp;
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cp.dataProcessing = NULL;
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cp.memAccess = NULL;
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cp.twoRegF = pxa255dspAccess;
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cp.userData = dsp;
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cpuCoprocessorRegister(cpu, 0, &cp);
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return true;
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}
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