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Line 28... |
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extern int cont_run;
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extern int cont_run;
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/* Data MMU */
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/* Data MMU */
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unsigned long dmmu_translate(unsigned long virtaddr)
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inline unsigned long dmmu_simulate_tlb(unsigned long virtaddr, int write_access)
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{
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{
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unsigned long phyaddr = dmmu_simulate_tlb(virtaddr);
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int set, way = -1;
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int i;
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unsigned long tagaddr;
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unsigned long vpn;
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if (!(mfspr(SPR_SR) & SPR_SR_DME) || (!testsprbits(SPR_SR, SPR_SR_DME)))
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return virtaddr;
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/* Which set to check out? */
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set = (virtaddr / config.dmmu.pagesize) % config.dmmu.nsets;
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tagaddr = (virtaddr / config.dmmu.pagesize) / config.dmmu.nsets;
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vpn = virtaddr / config.dmmu.pagesize;
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/* Scan all ways and try to find a matching way. */
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for (i = 0; i < config.dmmu.nways; i++)
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if ((getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_VPN) == vpn) &&
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testsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_V))
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way = i;
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/* Did we find our tlb entry? */
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if (way >= 0) { /* Yes, we did. */
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dmmu_stats.loads_tlbhit++;
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debug(5, "DTLB hit (virtaddr=%x).\n", virtaddr);
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/* Test for page fault */
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if (mfspr (SPR_SR) & SPR_SR_SUPV) {
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if ( write_access && !(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_SWE)
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|| !write_access && !(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_SRE))
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except_handle(EXCEPT_DPF, virtaddr);
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} else {
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if ( write_access && !(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_UWE)
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|| !write_access && !(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_URE))
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except_handle(EXCEPT_DPF, virtaddr);
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}
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/* Set LRUs */
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for (i = 0; i < config.dmmu.nways; i++)
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if (testsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU))
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setsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU, getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU) - 1);
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setsprbits(SPR_DTLBMR_BASE(way) + set, SPR_DTLBMR_LRU, config.dmmu.ustates - 1);
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return getsprbits(SPR_DTLBTR_BASE(way) + set, SPR_DTLBTR_PPN) * config.dmmu.pagesize + (virtaddr % config.dmmu.pagesize);
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}
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else { /* No, we didn't. */
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int minlru = config.dmmu.ustates - 1;
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int minway = 0;
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dmmu_stats.loads_tlbmiss++;
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#if 0
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for (i = 0; i < config.dmmu.nways; i++)
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if (getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU) < minlru)
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minway = i;
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setsprbits(SPR_DTLBMR_BASE(minway) + set, SPR_DTLBMR_VPN, vpn);
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for (i = 0; i < config.dmmu.nways; i++)
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if (getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU))
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setsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU, getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU) - 1);
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setsprbits(SPR_DTLBMR_BASE(minway) + set, SPR_DTLBMR_LRU, config.dmmu.ustates - 1);
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setsprbits(SPR_DTLBTR_BASE(minway) + set, SPR_DTLBTR_PPN, vpn); /* 1 to 1 */
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setsprbits(SPR_DTLBMR_BASE(minway) + set, SPR_DTLBMR_V, 1);
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#endif
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except_handle(EXCEPT_DTLBMISS, virtaddr);
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/* if tlb refill implemented in HW */
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/* return getsprbits(SPR_DTLBTR_BASE(minway) + set, SPR_DTLBTR_PPN) * config.dmmu.pagesize + (virtaddr % config.dmmu.pagesize); */
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return 0;
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}
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}
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unsigned long dmmu_translate(unsigned long virtaddr, int write_access)
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{
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unsigned long phyaddr = dmmu_simulate_tlb(virtaddr, write_access);
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/* printf("DMMU translate(%x) = %x\n", virtaddr, phyaddr);*/
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/* printf("DMMU translate(%x) = %x\n", virtaddr, phyaddr);*/
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return phyaddr;
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return phyaddr;
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}
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}
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Line 170... |
}
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}
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}
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}
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printf("\n");
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printf("\n");
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}
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}
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unsigned long dmmu_simulate_tlb(unsigned long virtaddr)
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{
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int set, way = -1;
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int i;
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unsigned long tagaddr;
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unsigned long vpn;
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if (!(mfspr(SPR_SR) & SPR_SR_DME) || (!testsprbits(SPR_SR, SPR_SR_DME)))
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return virtaddr;
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/* Which set to check out? */
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set = (virtaddr / config.dmmu.pagesize) % config.dmmu.nsets;
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tagaddr = (virtaddr / config.dmmu.pagesize) / config.dmmu.nsets;
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vpn = virtaddr / config.dmmu.pagesize;
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/* Scan all ways and try to find a matching way. */
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for (i = 0; i < config.dmmu.nways; i++)
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if ((getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_VPN) == vpn) &&
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testsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_V))
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way = i;
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/* Did we find our tlb entry? */
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if (way >= 0) { /* Yes, we did. */
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dmmu_stats.loads_tlbhit++;
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debug(5, "DTLB hit (virtaddr=%x).\n", virtaddr);
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/* Set LRUs */
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for (i = 0; i < config.dmmu.nways; i++)
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if (testsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU))
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setsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU, getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU) - 1);
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setsprbits(SPR_DTLBMR_BASE(way) + set, SPR_DTLBMR_LRU, config.dmmu.ustates - 1);
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return getsprbits(SPR_DTLBTR_BASE(way) + set, SPR_DTLBTR_PPN) * config.dmmu.pagesize + (virtaddr % config.dmmu.pagesize);
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}
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else { /* No, we didn't. */
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int minlru = config.dmmu.ustates - 1;
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int minway = 0;
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dmmu_stats.loads_tlbmiss++;
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#if 0
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for (i = 0; i < config.dmmu.nways; i++)
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if (getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU) < minlru)
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minway = i;
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setsprbits(SPR_DTLBMR_BASE(minway) + set, SPR_DTLBMR_VPN, vpn);
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for (i = 0; i < config.dmmu.nways; i++)
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if (getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU))
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setsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU, getsprbits(SPR_DTLBMR_BASE(i) + set, SPR_DTLBMR_LRU) - 1);
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setsprbits(SPR_DTLBMR_BASE(minway) + set, SPR_DTLBMR_LRU, config.dmmu.ustates - 1);
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setsprbits(SPR_DTLBTR_BASE(minway) + set, SPR_DTLBTR_PPN, vpn); /* 1 to 1 */
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setsprbits(SPR_DTLBMR_BASE(minway) + set, SPR_DTLBMR_V, 1);
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#endif
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except_handle(EXCEPT_DTLBMISS, virtaddr);
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/* if tlb refill implemented in HW */
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/* return getsprbits(SPR_DTLBTR_BASE(minway) + set, SPR_DTLBTR_PPN) * config.dmmu.pagesize + (virtaddr % config.dmmu.pagesize); */
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return 0;
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}
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}
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No newline at end of file
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No newline at end of file
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