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[/] [eco32/] [tags/] [eco32-0.25/] [sim/] [mmu.h] - Rev 279
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/* * mmu.h -- MMU simulation */ #ifndef _MMU_H_ #define _MMU_H_ #define TLB_SHFT 5 /* log2 of number of TLB entries */ #define TLB_SIZE (1 << TLB_SHFT) /* total number of TLB entries */ #define TLB_MASK (TLB_SIZE - 1) /* mask for number of TLB entries */ #define TLB_FIXED 4 /* number of fixed TLB entries */ #define TLB_WRITE (1 << 1) /* write bit in EntryLo */ #define TLB_VALID (1 << 0) /* valid bit in EntryLo */ #define MMU_ACCS_MASK 0x07 /* bits used in BadAccs */ #define MMU_ACCS_READ 0x00 /* access type = read */ #define MMU_ACCS_WRITE 0x04 /* access type = write */ #define MMU_ACCS_BYTE 0x00 /* access width = byte */ #define MMU_ACCS_HALF 0x01 /* access width = half */ #define MMU_ACCS_WORD 0x02 /* access width = word */ typedef struct { Word page; /* 20 high-order bits of virtual address */ Word frame; /* 20 high-order bits of physical address */ Bool write; /* must be true to allow writing to the page */ Bool valid; /* must be true for the entry to be valid */ } TLB_Entry; Word mmuReadWord(Word vAddr, Bool userMode); Half mmuReadHalf(Word vAddr, Bool userMode); Byte mmuReadByte(Word vAddr, Bool userMode); void mmuWriteWord(Word vAddr, Word data, Bool userMode); void mmuWriteHalf(Word vAddr, Half data, Bool userMode); void mmuWriteByte(Word vAddr, Byte data, Bool userMode); Word mmuGetIndex(void); void mmuSetIndex(Word value); Word mmuGetEntryHi(void); void mmuSetEntryHi(Word value); Word mmuGetEntryLo(void); void mmuSetEntryLo(Word value); Word mmuGetBadAddr(void); void mmuSetBadAddr(Word value); Word mmuGetBadAccs(void); void mmuSetBadAccs(Word value); void mmuTbs(void); void mmuTbwr(void); void mmuTbri(void); void mmuTbwi(void); TLB_Entry mmuGetTLB(int index); void mmuSetTLB(int index, TLB_Entry tlbEntry); void mmuReset(void); void mmuInit(void); void mmuExit(void); #endif /* _MMU_H_ */
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