-
Notifications
You must be signed in to change notification settings - Fork 1
/
icache.c
140 lines (99 loc) · 3.33 KB
/
icache.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
#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;
}