| Line 49... |
Line 49... |
/* Number of usage states (2, 3, 4 etc., max is 4). */
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/* Number of usage states (2, 3, 4 etc., max is 4). */
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#define ITLB_USTATES 2
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#define ITLB_USTATES 2
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|
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void itlb_info()
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void itlb_info()
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{
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{
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if (!getsprbits(SPR_UPR, SPR_UPR_IMP)) {
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if (!testsprbits(SPR_UPR, SPR_UPR_IMP)) {
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printf("IMMU not implemented. Set UPR[IMP].\n");
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printf("IMMU not implemented. Set UPR[IMP].\n");
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return;
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return;
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}
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}
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|
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printf("Insn MMU %dKB: ", ITLB_SETS * ITLB_ENTRY_SIZE * ITLB_WAYS / 1024);
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printf("Insn MMU %dKB: ", ITLB_SETS * ITLB_ENTRY_SIZE * ITLB_WAYS / 1024);
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| Line 77... |
Line 77... |
{
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{
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int set;
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int set;
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int way;
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int way;
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int end_set = ITLB_SETS;
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int end_set = ITLB_SETS;
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|
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if (!getsprbits(SPR_UPR, SPR_UPR_IMP)) {
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if (!testsprbits(SPR_UPR, SPR_UPR_IMP)) {
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printf("IMMU not implemented. Set UPR[IMP].\n");
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printf("IMMU not implemented. Set UPR[IMP].\n");
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return;
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return;
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}
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}
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|
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if ((start_set >= 0) && (start_set < end_set))
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if ((start_set >= 0) && (start_set < end_set))
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| Line 117... |
Line 117... |
int set, way = -1;
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int set, way = -1;
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int i;
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int i;
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unsigned long tagaddr;
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unsigned long tagaddr;
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unsigned long vpn;
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unsigned long vpn;
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|
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if (!(mfspr(SPR_SR) & SPR_SR_IME) || !(getsprbits(SPR_UPR, SPR_UPR_IMP)))
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if (!(mfspr(SPR_SR) & SPR_SR_IME) || !(testsprbits(SPR_UPR, SPR_UPR_IMP)))
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return virtaddr;
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return virtaddr;
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|
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/* Which set to check out? */
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/* Which set to check out? */
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set = (virtaddr / PAGE_SIZE) % ITLB_SETS;
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set = (virtaddr / PAGE_SIZE) % ITLB_SETS;
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tagaddr = (virtaddr / PAGE_SIZE) / ITLB_SETS;
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tagaddr = (virtaddr / PAGE_SIZE) / ITLB_SETS;
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vpn = virtaddr / PAGE_SIZE;
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vpn = virtaddr / PAGE_SIZE;
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|
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/* Scan all ways and try to find a matching way. */
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/* Scan all ways and try to find a matching way. */
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < ITLB_WAYS; i++)
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if ((getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_VPN) == vpn) &&
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if ((getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_VPN) == vpn) &&
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getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_V))
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testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_V))
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way = i;
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way = i;
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|
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/* Did we find our tlb entry? */
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/* Did we find our tlb entry? */
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if (way >= 0) { /* Yes, we did. */
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if (way >= 0) { /* Yes, we did. */
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immu_stats.fetch_tlbhit++;
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immu_stats.fetch_tlbhit++;
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debug("ITLB hit (virtaddr=%x).\n", virtaddr);
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debug("ITLB hit (virtaddr=%x).\n", virtaddr);
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|
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/* Set LRUs */
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/* Set LRUs */
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < ITLB_WAYS; i++)
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if (getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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if (testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_LRU, ITLB_USTATES - 1);
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setsprbits(SPR_ITLBMR_BASE(way) + set, SPR_ITLBMR_LRU, ITLB_USTATES - 1);
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|
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return getsprbits(SPR_ITLBTR_BASE(way) + set, SPR_ITLBTR_PPN) * PAGE_SIZE + (virtaddr % PAGE_SIZE);
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return getsprbits(SPR_ITLBTR_BASE(way) + set, SPR_ITLBTR_PPN) * PAGE_SIZE + (virtaddr % PAGE_SIZE);
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}
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}
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| Line 157... |
Line 157... |
if (getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) < minlru)
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if (getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) < minlru)
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minway = i;
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minway = i;
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|
|
setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_VPN, vpn);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_VPN, vpn);
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for (i = 0; i < ITLB_WAYS; i++)
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for (i = 0; i < ITLB_WAYS; i++)
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if (getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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if (testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU))
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU, getsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_LRU) - 1);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_LRU, ITLB_USTATES - 1);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_LRU, ITLB_USTATES - 1);
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setsprbits(SPR_ITLBTR_BASE(minway) + set, SPR_ITLBTR_PPN, vpn); /* 1 to 1 */
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setsprbits(SPR_ITLBTR_BASE(minway) + set, SPR_ITLBTR_PPN, vpn); /* 1 to 1 */
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_V, 1);
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setsprbits(SPR_ITLBMR_BASE(minway) + set, SPR_ITLBMR_V, 1);
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#endif
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#endif
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