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https://opencores.org/ocsvn/eco32/eco32/trunk
[/] [eco32/] [trunk/] [sim/] [mmu.c] - Diff between revs 78 and 166
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| Rev 78 |
Rev 166 |
| Line 39... |
Line 39... |
}
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}
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return n;
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return n;
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}
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}
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static void assocDelay(void) {
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int n, i;
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/* simulate delay introduced by assoc when using mapped
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addresses but not experienced with unmapped addresses */
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n = -1;
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for (i = 0; i < TLB_SIZE; i++) {
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if (tlb[i].page == 0) {
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n = i;
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}
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}
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}
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static Word v2p(Word vAddr, Bool userMode, Bool writing) {
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static Word v2p(Word vAddr, Bool userMode, Bool writing) {
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Word pAddr;
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Word pAddr;
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Word page, offset;
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Word page, offset;
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int index;
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int index;
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| Line 68... |
Line 54... |
mmuBadAddr = vAddr;
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mmuBadAddr = vAddr;
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throwException(EXC_PRV_ADDRESS);
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throwException(EXC_PRV_ADDRESS);
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}
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}
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if ((vAddr & 0xC0000000) == 0xC0000000) {
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if ((vAddr & 0xC0000000) == 0xC0000000) {
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/* unmapped address space */
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/* unmapped address space */
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assocDelay();
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/* simulate delay introduced by assoc when using mapped
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addresses but not experienced with unmapped addresses */
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assoc(0);
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pAddr = vAddr & ~0xC0000000;
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pAddr = vAddr & ~0xC0000000;
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} else {
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} else {
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/* mapped address space */
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/* mapped address space */
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page = vAddr & PAGE_MASK;
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page = vAddr & PAGE_MASK;
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offset = vAddr & OFFSET_MASK;
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offset = vAddr & OFFSET_MASK;
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