105 lines
2.0 KiB
C
105 lines
2.0 KiB
C
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#include "pxa255_IC.h"
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#include "mem.h"
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static void pxa255icPrvHandleChanges(Pxa255ic* ic){
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Boolean nowIrq, nowFiq;
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UInt32 unmasked = ic->ICPR & ic->ICMR;
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nowFiq = (unmasked & ic->ICLR) != 0;
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nowIrq = (unmasked & ~ic->ICLR) != 0;
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if(nowFiq != ic->wasFiq) cpuIrq(ic->cpu, true, nowFiq);
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if(nowIrq != ic->wasIrq) cpuIrq(ic->cpu, false, nowIrq);
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ic->wasFiq = nowFiq;
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ic->wasIrq = nowIrq;
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}
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static Boolean pxa255icPrvMemAccessF(void* userData, UInt32 pa, UInt8 size, Boolean write, void* buf){
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Pxa255ic* ic = userData;
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UInt32 val = 0;
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if(size != 4) {
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err_str(__FILE__ ": Unexpected ");
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// err_str(write ? "write" : "read");
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// err_str(" of ");
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// err_dec(size);
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// err_str(" bytes to 0x");
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// err_hex(pa);
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// err_str("\r\n");
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return true; //we do not support non-word accesses
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}
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pa = (pa - PXA255_IC_BASE) >> 2;
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if(write){
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if(pa == 1) ic->ICMR = *(UInt32*)buf;
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else if(pa == 2) ic->ICLR = *(UInt32*)buf;
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else if(pa == 5) ic->ICCR = *(UInt32*)buf;
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else return true;
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pxa255icPrvHandleChanges(ic);
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}
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else{
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switch(pa){
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case 0:
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val = ic->ICPR & ic->ICMR & ~ic->ICLR;
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break;
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case 1:
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val = ic->ICMR;
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break;
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case 2:
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val = ic->ICLR;
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break;
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case 3:
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val = ic->ICPR & ic->ICMR & ic->ICLR;
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break;
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case 4:
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val = ic->ICPR;
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break;
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case 5:
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val = ic->ICCR;
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break;
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}
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*(UInt32*)buf = val;
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}
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return true;
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}
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Boolean pxa255icInit(Pxa255ic* ic, ArmCpu* cpu, ArmMem* physMem){
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__mem_zero(ic, sizeof(Pxa255ic));
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ic->cpu = cpu;
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return memRegionAdd(physMem, PXA255_IC_BASE, PXA255_IC_SIZE, pxa255icPrvMemAccessF, ic);
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}
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void pxa255icInt(Pxa255ic* ic, UInt8 intNum, Boolean raise){ //interrupt caused by emulated hardware
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UInt32 old_, new_;
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old_ = new_ = ic->ICPR;
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if(raise) new_ |= (1UL << intNum);
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else new_ &=~ (1UL << intNum);
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if(new_ != old_){
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ic->ICPR = new_;
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pxa255icPrvHandleChanges(ic);
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}
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}
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