| Line 62... |
Line 62... |
tagaddr = (virtaddr / config.immu.pagesize) / config.immu.nsets;
|
tagaddr = (virtaddr / config.immu.pagesize) / config.immu.nsets;
|
vpn = virtaddr / (config.immu.pagesize * config.immu.nsets);
|
vpn = virtaddr / (config.immu.pagesize * config.immu.nsets);
|
|
|
/* Scan all ways and try to find a matching way. */
|
/* Scan all ways and try to find a matching way. */
|
for (i = 0; i < config.immu.nways; i++)
|
for (i = 0; i < config.immu.nways; i++)
|
if (((mfspr(SPR_ITLBMR_BASE(i) + set) / (config.immu.pagesize * config.immu.nsets)) == vpn) &&
|
if (((cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] / (config.immu.pagesize * config.immu.nsets)) == vpn) &&
|
(cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] & SPR_ITLBMR_V))
|
(cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] & SPR_ITLBMR_V))
|
way = i;
|
way = i;
|
|
|
/* Did we find our tlb entry? */
|
/* Did we find our tlb entry? */
|
if (way >= 0) { /* Yes, we did. */
|
if (way >= 0) { /* Yes, we did. */
|
| Line 83... |
Line 83... |
}
|
}
|
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set] &= ~SPR_ITLBMR_LRU;
|
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set] &= ~SPR_ITLBMR_LRU;
|
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set] |= (config.immu.nsets - 1) << 6;
|
cpu_state.sprs[SPR_ITLBMR_BASE(way) + set] |= (config.immu.nsets - 1) << 6;
|
|
|
/* Check if page is cache inhibited */
|
/* Check if page is cache inhibited */
|
insn_ci = (mfspr(SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_CI) == SPR_ITLBTR_CI;
|
insn_ci = (cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] & SPR_ITLBTR_CI) == SPR_ITLBTR_CI;
|
|
|
runtime.sim.mem_cycles += config.immu.hitdelay;
|
runtime.sim.mem_cycles += config.immu.hitdelay;
|
|
|
/* Test for page fault */
|
/* Test for page fault */
|
if (mfspr (SPR_SR) & SPR_SR_SM) {
|
if (cpu_state.sprs[SPR_SR] & SPR_SR_SM) {
|
if (!(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_SXE))
|
if (!(cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] & SPR_ITLBTR_SXE))
|
except_handle(EXCEPT_IPF, virtaddr);
|
except_handle(EXCEPT_IPF, virtaddr);
|
} else {
|
} else {
|
if (!(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_UXE))
|
if (!(cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] & SPR_ITLBTR_UXE))
|
except_handle(EXCEPT_IPF, virtaddr);
|
except_handle(EXCEPT_IPF, virtaddr);
|
}
|
}
|
|
|
ppn = mfspr(SPR_ITLBTR_BASE(way) + set) / config.immu.pagesize;
|
ppn = cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] / config.immu.pagesize;
|
return (ppn * config.immu.pagesize) + (virtaddr % config.immu.pagesize);
|
return (ppn * config.immu.pagesize) + (virtaddr % config.immu.pagesize);
|
}
|
}
|
else { /* No, we didn't. */
|
else { /* No, we didn't. */
|
immu_stats.fetch_tlbmiss++;
|
immu_stats.fetch_tlbmiss++;
|
#if 0
|
#if 0
|
| Line 163... |
Line 163... |
tagaddr = (virtaddr / config.immu.pagesize) / config.immu.nsets;
|
tagaddr = (virtaddr / config.immu.pagesize) / config.immu.nsets;
|
vpn = virtaddr / (config.immu.pagesize * config.immu.nsets);
|
vpn = virtaddr / (config.immu.pagesize * config.immu.nsets);
|
|
|
/* Scan all ways and try to find a matching way. */
|
/* Scan all ways and try to find a matching way. */
|
for (i = 0; i < config.immu.nways; i++)
|
for (i = 0; i < config.immu.nways; i++)
|
if (((mfspr(SPR_ITLBMR_BASE(i) + set) / (config.immu.pagesize * config.immu.nsets)) == vpn) &&
|
if (((cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] / (config.immu.pagesize * config.immu.nsets)) == vpn) &&
|
(cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] & SPR_ITLBMR_V))
|
(cpu_state.sprs[SPR_ITLBMR_BASE(i) + set] & SPR_ITLBMR_V))
|
way = i;
|
way = i;
|
|
|
/* Did we find our tlb entry? */
|
/* Did we find our tlb entry? */
|
if (way >= 0) { /* Yes, we did. */
|
if (way >= 0) { /* Yes, we did. */
|
|
|
/* Test for page fault */
|
/* Test for page fault */
|
if (mfspr (SPR_SR) & SPR_SR_SM) {
|
if (cpu_state.sprs[SPR_SR] & SPR_SR_SM) {
|
if (!(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_SXE)) {
|
if (!(cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] & SPR_ITLBTR_SXE)) {
|
/* no luck, giving up */
|
/* no luck, giving up */
|
return(0);
|
return(0);
|
}
|
}
|
} else {
|
} else {
|
if (!(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_UXE)) {
|
if (!(cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] & SPR_ITLBTR_UXE)) {
|
/* no luck, giving up */
|
/* no luck, giving up */
|
return(0);
|
return(0);
|
}
|
}
|
}
|
}
|
|
|
ppn = mfspr(SPR_ITLBTR_BASE(way) + set) / config.immu.pagesize;
|
ppn = cpu_state.sprs[SPR_ITLBTR_BASE(way) + set] / config.immu.pagesize;
|
return (ppn * config.immu.pagesize) + (virtaddr % config.immu.pagesize);
|
return (ppn * config.immu.pagesize) + (virtaddr % config.immu.pagesize);
|
}
|
}
|
else {
|
else {
|
return(0);
|
return(0);
|
}
|
}
|
