114 lines
2.3 KiB
C
114 lines
2.3 KiB
C
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#include "mem.h"
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#include "RAM.h"
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static Boolean ramAccessF(void* userData, UInt32 pa, UInt8 size, Boolean write, void* bufP){
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ArmRam* ram = userData;
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UInt8* addr = (UInt8*)ram->buf;
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pa -= ram->adr;
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if(pa >= ram->sz) return false;
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addr += pa;
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if(write){
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switch(size){
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case 1:
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*((UInt8*)addr) = *(UInt8*)bufP; //our memory system is little-endian
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break;
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case 2:
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*((UInt16*)addr) = *(UInt16*)bufP; //our memory system is little-endian
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break;
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case 4:
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*((UInt32*)addr) = *(UInt32*)bufP;
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break;
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case 8:
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*((UInt32*)(addr + 0)) = ((UInt32*)bufP)[0];
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*((UInt32*)(addr + 4)) = ((UInt32*)bufP)[1];
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break;
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default:
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return false;
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}
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}
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else{
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switch(size){
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case 1:
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*(UInt8*)bufP = *((UInt8*)addr);
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break;
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case 2:
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*(UInt16*)bufP = *((UInt16*)addr);
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break;
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case 4:
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*(UInt32*)bufP = *((UInt32*)addr);
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break;
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case 64:
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((UInt32*)bufP)[ 8] = *((UInt32*)(addr + 32));
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((UInt32*)bufP)[ 9] = *((UInt32*)(addr + 36));
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((UInt32*)bufP)[10] = *((UInt32*)(addr + 40));
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((UInt32*)bufP)[11] = *((UInt32*)(addr + 44));
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((UInt32*)bufP)[12] = *((UInt32*)(addr + 48));
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((UInt32*)bufP)[13] = *((UInt32*)(addr + 52));
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((UInt32*)bufP)[14] = *((UInt32*)(addr + 56));
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((UInt32*)bufP)[15] = *((UInt32*)(addr + 60));
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//fallthrough
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case 32:
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((UInt32*)bufP)[4] = *((UInt32*)(addr + 16));
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((UInt32*)bufP)[5] = *((UInt32*)(addr + 20));
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((UInt32*)bufP)[6] = *((UInt32*)(addr + 24));
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((UInt32*)bufP)[7] = *((UInt32*)(addr + 28));
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//fallthrough
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case 16:
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((UInt32*)bufP)[2] = *((UInt32*)(addr + 8));
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((UInt32*)bufP)[3] = *((UInt32*)(addr + 12));
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//fallthrough
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case 8:
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((UInt32*)bufP)[0] = *((UInt32*)(addr + 0));
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((UInt32*)bufP)[1] = *((UInt32*)(addr + 4));
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break;
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default:
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return false;
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}
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}
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return true;
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}
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Boolean ramInit(ArmRam* ram, ArmMem* mem, UInt32 adr, UInt32 sz, UInt32* buf){
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ram->adr = adr;
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ram->sz = sz;
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ram->buf = buf;
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return memRegionAdd(mem, adr, sz, &ramAccessF, ram);
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}
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Boolean ramDeinit(ArmRam* ram, ArmMem* mem){
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return memRegionDel(mem, ram->adr, ram->sz);
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}
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