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[/] [eco32/] [tags/] [eco32-0.23/] [monitor/] [monitor/] [common/] [mmu.c] - Rev 162
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/* * mmu.c -- memory and TLB access */ #include "common.h" #include "stdarg.h" #include "romlib.h" #include "mmu.h" #include "start.h" static Word tlbIndex; static Word tlbEntryHi; static Word tlbEntryLo; static Word badAddress; Word mmuReadWord(Word vAddr) { return *(Word *)vAddr; } Half mmuReadHalf(Word vAddr) { return *(Half *)vAddr; } Byte mmuReadByte(Word vAddr) { return *(Byte *)vAddr; } void mmuWriteWord(Word vAddr, Word data) { *(Word *)vAddr = data; } void mmuWriteHalf(Word vAddr, Half data) { *(Half *)vAddr = data; } void mmuWriteByte(Word vAddr, Byte data) { *(Byte *)vAddr = data; } Word mmuGetIndex(void) { return tlbIndex; } void mmuSetIndex(Word value) { tlbIndex = value; } Word mmuGetEntryHi(void) { return tlbEntryHi; } void mmuSetEntryHi(Word value) { tlbEntryHi = value; } Word mmuGetEntryLo(void) { return tlbEntryLo; } void mmuSetEntryLo(Word value) { tlbEntryLo = value; } Word mmuGetBadAddr(void) { return badAddress; } void mmuSetBadAddr(Word value) { badAddress = value; } TLB_Entry mmuGetTLB(int index) { Word hi; Word lo; TLB_Entry result; hi = getTLB_HI(index); lo = getTLB_LO(index); result.page = hi & PAGE_MASK; result.frame = lo & PAGE_MASK; result.write = (lo & TLB_WRITE) ? true : false; result.valid = (lo & TLB_VALID) ? true : false; return result; } void mmuSetTLB(int index, TLB_Entry tlbEntry) { Word flags; flags = 0; if (tlbEntry.write) { flags |= TLB_WRITE; } if (tlbEntry.valid) { flags |= TLB_VALID; } setTLB(index, tlbEntry.page, tlbEntry.frame | flags); }
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