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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8327 | maxcodehac | 1 | #include "types.h" |
| 2 | #include "CPU.h" |
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| 3 | #include "icache.h" |
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| 4 | |||
| 5 | //#define ICACHE_DEBUGGING |
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| 6 | |||
| 7 | |||
| 8 | |||
| 9 | #ifdef ICACHE_DEBUGGING |
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| 10 | #define _icache_fetch_func icacheFetch_ |
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| 11 | #define _icache_test_func icacheFetch |
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| 12 | #else |
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| 13 | #define _icache_fetch_func icacheFetch |
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| 14 | #define _icache_test_func icacheFetch_test |
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| 15 | #endif |
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| 16 | |||
| 17 | void icacheInval(icache* ic){ |
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| 18 | |||
| 19 | UInt8 i, j; |
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| 20 | |||
| 21 | for(i = 0; i < ICACHE_BUCKET_NUM; i++){ |
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| 22 | for(j = 0; j < ICACHE_BUCKET_SZ; j++) ic->lines[i][j].info = 0; |
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| 23 | ic->ptr[i] = 0; |
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| 24 | } |
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| 25 | } |
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| 26 | |||
| 27 | void icacheInit(icache* ic, ArmCpu* cpu, ArmCpuMemF memF){ |
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| 28 | |||
| 29 | ic->cpu = cpu; |
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| 30 | ic->memF = memF; |
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| 31 | |||
| 32 | icacheInval(ic); |
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| 33 | } |
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| 34 | |||
| 35 | |||
| 36 | static UInt8 icachePrvHash(UInt32 addr){ |
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| 37 | |||
| 38 | addr >>= ICACHE_L; |
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| 39 | addr &= (1UL << ICACHE_S) - 1UL; |
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| 40 | |||
| 41 | return addr; |
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| 42 | } |
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| 43 | |||
| 44 | void icacheInvalAddr(icache* ic, UInt32 va){ |
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| 45 | |||
| 46 | UInt32 off = va % ICACHE_LINE_SZ; |
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| 47 | Int8 i, j, bucket; |
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| 48 | icacheLine* lines; |
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| 49 | |||
| 50 | va -= off; |
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| 51 | |||
| 52 | bucket = icachePrvHash(va); |
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| 53 | lines = ic->lines[bucket]; |
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| 54 | |||
| 55 | for(i = 0, j = ic->ptr[bucket]; (UInt8)i < ICACHE_BUCKET_SZ; i++){ |
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| 56 | |||
| 57 | if(--j == -1) j = ICACHE_BUCKET_SZ - 1; |
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| 58 | |||
| 59 | if((lines[j].info & (ICACHE_ADDR_MASK | ICACHE_USED_MASK)) == (va | ICACHE_USED_MASK)){ //found it! |
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| 60 | |||
| 61 | lines[j].info = 0; |
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| 62 | } |
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| 63 | } |
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| 64 | } |
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| 65 | |||
| 66 | /* |
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| 67 | 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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| 68 | */ |
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| 69 | |||
| 70 | Boolean _icache_fetch_func(icache* ic, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){ |
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| 71 | |||
| 72 | UInt32 off = va % ICACHE_LINE_SZ; |
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| 73 | Int8 i, j, bucket; |
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| 74 | icacheLine* lines; |
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| 75 | icacheLine* line; |
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| 76 | |||
| 77 | va -= off; |
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| 78 | |||
| 79 | bucket = icachePrvHash(va); |
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| 80 | lines = ic->lines[bucket]; |
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| 81 | |||
| 82 | for(i = 0, j = ic->ptr[bucket]; (UInt8)i < ICACHE_BUCKET_SZ; i++){ |
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| 83 | |||
| 84 | if(--j == -1) j = ICACHE_BUCKET_SZ - 1; |
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| 85 | |||
| 86 | if((lines[j].info & (ICACHE_ADDR_MASK | ICACHE_USED_MASK)) == (va | ICACHE_USED_MASK)){ //found it! |
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| 87 | |||
| 88 | if(sz == 4){ |
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| 89 | *(UInt32*)buf = *(UInt32*)(lines[j].data + off); |
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| 90 | } |
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| 91 | else if(sz == 2){ |
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| 92 | *(UInt16*)buf = *(UInt16*)(lines[j].data + off); |
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| 93 | } |
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| 94 | else __mem_copy(buf, lines[j].data + off, sz); |
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| 95 | return priviledged || !(lines[j].info & ICACHE_PRIV_MASK); |
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| 96 | } |
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| 97 | } |
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| 98 | //if we're here, we found nothing - time to populate the cache |
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| 99 | j = ic->ptr[bucket]++; |
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| 100 | if(ic->ptr[bucket] == ICACHE_BUCKET_SZ) ic->ptr[bucket] = 0; |
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| 101 | line = lines + j; |
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| 102 | |||
| 103 | line->info = va | (priviledged ? ICACHE_PRIV_MASK : 0); |
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| 104 | if(!ic->memF(ic->cpu, line->data, va, ICACHE_LINE_SZ, false, priviledged, fsrP)){ |
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| 105 | |||
| 106 | return false; |
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| 107 | } |
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| 108 | line->info |= ICACHE_USED_MASK; |
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| 109 | |||
| 110 | if(sz == 4){ |
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| 111 | *(UInt32*)buf = *(UInt32*)(line->data + off); |
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| 112 | } |
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| 113 | else if(sz == 2){ |
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| 114 | *(UInt16*)buf = *(UInt16*)(line->data + off); |
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| 115 | } |
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| 116 | else __mem_copy(buf, line->data + off, sz); |
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| 117 | return true; |
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| 118 | } |
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| 119 | |||
| 120 | #include "stdio.h" |
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| 121 | Boolean _icache_test_func(icache* ic, UInt32 va, UInt8 sz, Boolean priviledged, UInt8* fsrP, void* buf){ |
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| 122 | |||
| 123 | UInt8 fsrO = -1, fsrT = -1; |
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| 124 | UInt8 dataO[4] = {0}, dataT[4] = {0}; |
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| 125 | Boolean retO, retT; |
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| 126 | UInt8 i; |
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| 127 | |||
| 128 | retO = _icache_fetch_func(ic, va, sz, priviledged, &fsrO, dataO); |
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| 129 | retT = ic->memF(ic->cpu, dataT, va, sz, false, priviledged, &fsrT); |
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| 130 | |||
| 131 | 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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| 132 | |||
| 133 | fprintf(stderr, "icache fail!"); |
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| 134 | } |
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| 135 | |||
| 136 | for(i = 0; i < sz; i++) ((UInt8*)buf)[i] = dataT[i]; |
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| 137 | if(retT) *fsrP = fsrT; |
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| 138 | return retT; |
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| 139 | } |
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| 140 |