156 lines
3.5 KiB
C
Executable File
156 lines
3.5 KiB
C
Executable File
#include "types.h"
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#include "CPU.h"
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#include "dcache.h"
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//#define DCACHE_DEBUGGING
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#ifdef DCACHE_DEBUGGING
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#define _dcache_fetch_func dcacheFetch_
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#define _dcache_test_func dcacheFetch
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#else
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#define _dcache_fetch_func dcacheFetch
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#define _dcache_test_func dcacheFetch_test
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#endif
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void dcacheInval(dcache* dc){
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UInt8 i, j;
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for(i = 0; i < DCACHE_BUCKET_NUM; i++){
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for(j = 0; j < DCACHE_BUCKET_SZ; j++) dc->lines[i][j].info = 0;
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dc->ptr[i] = 0;
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}
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}
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void dcacheInit(dcache* dc, ArmCpu* cpu, ArmCpuMemF memF){
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dc->cpu = cpu;
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dc->memF = memF;
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dcacheInval(dc);
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}
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static UInt8 dcachePrvHash(UInt32 addr){
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addr >>= DCACHE_L;
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addr &= (1UL << DCACHE_S) - 1UL;
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return addr;
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}
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void dcacheInvalAddr(dcache* dc, UInt32 va){
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UInt32 off = va % DCACHE_LINE_SZ;
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Int8 i, j, bucket;
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dcacheLine* lines;
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va -= off;
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bucket = dcachePrvHash(va);
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lines = dc->lines[bucket];
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for(i = 0, j = dc->ptr[bucket]; i < DCACHE_BUCKET_SZ; i++){
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if(--j == -1) j = DCACHE_BUCKET_SZ - 1;
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if((lines[j].info & (DCACHE_ADDR_MASK | DCACHE_USED_MASK)) == (va | DCACHE_USED_MASK)){ //found it!
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lines[j].info = 0;
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}
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}
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}
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void dcacheFlush(dcache* dc){
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}
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void dcacheFlushAddr(dcache* dc, UInt32 va){
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}
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/*
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we cannot have data overlap cachelines since data is self aligned (word on 4-byte boundary, halfwords on2, etc. this is enforced elsewhere
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*/
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Boolean dcacheWrite(dcache* dc, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){
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}
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Boolean _dcache_fetch_func(dcache* dc, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){
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UInt32 off = va % DCACHE_LINE_SZ;
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Int8 i, j, bucket;
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dcacheLine* lines;
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dcacheLine* line;
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va -= off;
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bucket = dcachePrvHash(va);
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lines = dc->lines[bucket];
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for(i = 0, j = dc->ptr[bucket]; i < DCACHE_BUCKET_SZ; i++){
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if(--j == -1) j = DCACHE_BUCKET_SZ - 1;
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if((lines[j].info & (DCACHE_ADDR_MASK | DCACHE_USED_MASK)) == (va | DCACHE_USED_MASK)){ //found it!
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if(sz == 4){
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*(UInt32*)buf = *(UInt32*)(lines[j].data + off);
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}
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else if(sz == 2){
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*(UInt16*)buf = *(UInt16*)(lines[j].data + off);
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}
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else __mem_copy(buf, lines[j].data + off, sz);
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return priviledged || !(lines[j].info & DCACHE_PRIV_MASK);
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}
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}
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//if we're here, we found nothing - time to populate the cache
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j = dc->ptr[bucket]++;
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if(dc->ptr[bucket] == DCACHE_BUCKET_SZ) dc->ptr[bucket] = 0;
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line = lines + j;
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line->info = va | (priviledged ? DCACHE_PRIV_MASK : 0);
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if(!dc->memF(dc->cpu, line->data, va, DCACHE_LINE_SZ, false, priviledged, fsrP)){
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return false;
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}
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line->info |= DCACHE_USED_MASK;
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if(sz == 4){
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*(UInt32*)buf = *(UInt32*)(line->data + off);
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}
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else if(sz == 2){
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*(UInt16*)buf = *(UInt16*)(line->data + off);
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}
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else __mem_copy(buf, line->data + off, sz);
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return true;
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}
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#include "stdio.h"
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Boolean _dcache_test_func(dcache* dc, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){
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UInt8 fsrO = -1, fsrT = -1;
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UInt8 dataO[4] = {0}, dataT[4] = {0};
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Boolean retO, retT;
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UInt8 i;
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retO = _dcache_fetch_func(dc, va, sz, priviledged, &fsrO, dataO);
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retT = dc->memF(dc->cpu, dataT, va, sz, false, priviledged, &fsrT);
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if((retT != retO) || (fsrT != fsrO) || (dataT[0] != dataO[0]) || (dataT[1] != dataO[1]) || (dataT[2] != dataO[2]) || (dataT[3] != dataO[3])){
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fprintf(stderr, "dcache fail!");
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}
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for(i = 0; i < sz; i++) ((UInt8*)buf)[i] = dataT[i];
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if(retT) *fsrP = fsrT;
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return retT;
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}
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