kolibrios-fun/contrib/other/uarm/icache.c

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#include "types.h"
#include "CPU.h"
#include "icache.h"
//#define ICACHE_DEBUGGING
#ifdef ICACHE_DEBUGGING
#define _icache_fetch_func icacheFetch_
#define _icache_test_func icacheFetch
#else
#define _icache_fetch_func icacheFetch
#define _icache_test_func icacheFetch_test
#endif
void icacheInval(icache* ic){
UInt8 i, j;
for(i = 0; i < ICACHE_BUCKET_NUM; i++){
for(j = 0; j < ICACHE_BUCKET_SZ; j++) ic->lines[i][j].info = 0;
ic->ptr[i] = 0;
}
}
void icacheInit(icache* ic, ArmCpu* cpu, ArmCpuMemF memF){
ic->cpu = cpu;
ic->memF = memF;
icacheInval(ic);
}
static UInt8 icachePrvHash(UInt32 addr){
addr >>= ICACHE_L;
addr &= (1UL << ICACHE_S) - 1UL;
return addr;
}
void icacheInvalAddr(icache* ic, UInt32 va){
UInt32 off = va % ICACHE_LINE_SZ;
Int8 i, j, bucket;
icacheLine* lines;
va -= off;
bucket = icachePrvHash(va);
lines = ic->lines[bucket];
for(i = 0, j = ic->ptr[bucket]; (UInt8)i < ICACHE_BUCKET_SZ; i++){
if(--j == -1) j = ICACHE_BUCKET_SZ - 1;
if((lines[j].info & (ICACHE_ADDR_MASK | ICACHE_USED_MASK)) == (va | ICACHE_USED_MASK)){ //found it!
lines[j].info = 0;
}
}
}
/*
we cannot have data overlap cachelines since data is self aligned (word on 4-byte boundary, halfwords on2, etc. this is enforced elsewhere
*/
Boolean _icache_fetch_func(icache* ic, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){
UInt32 off = va % ICACHE_LINE_SZ;
Int8 i, j, bucket;
icacheLine* lines;
icacheLine* line;
va -= off;
bucket = icachePrvHash(va);
lines = ic->lines[bucket];
for(i = 0, j = ic->ptr[bucket]; (UInt8)i < ICACHE_BUCKET_SZ; i++){
if(--j == -1) j = ICACHE_BUCKET_SZ - 1;
if((lines[j].info & (ICACHE_ADDR_MASK | ICACHE_USED_MASK)) == (va | ICACHE_USED_MASK)){ //found it!
if(sz == 4){
*(UInt32*)buf = *(UInt32*)(lines[j].data + off);
}
else if(sz == 2){
*(UInt16*)buf = *(UInt16*)(lines[j].data + off);
}
else __mem_copy(buf, lines[j].data + off, sz);
return priviledged || !(lines[j].info & ICACHE_PRIV_MASK);
}
}
//if we're here, we found nothing - time to populate the cache
j = ic->ptr[bucket]++;
if(ic->ptr[bucket] == ICACHE_BUCKET_SZ) ic->ptr[bucket] = 0;
line = lines + j;
line->info = va | (priviledged ? ICACHE_PRIV_MASK : 0);
if(!ic->memF(ic->cpu, line->data, va, ICACHE_LINE_SZ, false, priviledged, fsrP)){
return false;
}
line->info |= ICACHE_USED_MASK;
if(sz == 4){
*(UInt32*)buf = *(UInt32*)(line->data + off);
}
else if(sz == 2){
*(UInt16*)buf = *(UInt16*)(line->data + off);
}
else __mem_copy(buf, line->data + off, sz);
return true;
}
#include "stdio.h"
Boolean _icache_test_func(icache* ic, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){
UInt8 fsrO = -1, fsrT = -1;
UInt8 dataO[4] = {0}, dataT[4] = {0};
Boolean retO, retT;
UInt8 i;
retO = _icache_fetch_func(ic, va, sz, priviledged, &fsrO, dataO);
retT = ic->memF(ic->cpu, dataT, va, sz, false, priviledged, &fsrT);
if((retT != retO) || (fsrT != fsrO) || (dataT[0] != dataO[0]) || (dataT[1] != dataO[1]) || (dataT[2] != dataO[2]) || (dataT[3] != dataO[3])){
fprintf(stderr, "icache fail!");
}
for(i = 0; i < sz; i++) ((UInt8*)buf)[i] = dataT[i];
if(retT) *fsrP = fsrT;
return retT;
}