| Line 104... |
Line 104... |
runtime.sim.mem_cycles += config.immu.missdelay;
|
runtime.sim.mem_cycles += config.immu.missdelay;
|
return 0;
|
return 0;
|
}
|
}
|
}
|
}
|
|
|
|
/* DESC: try to find EA -> PA transaltion without changing
|
|
* any of precessor states. if this is not passible gives up
|
|
* (without triggering exceptions)
|
|
*
|
|
* PRMS: virtaddr - EA for which to find translation
|
|
*
|
|
* RTRN: 0 - no IMMU, IMMU disabled or ITLB miss
|
|
* else - appropriate PA (note it IMMU is not present
|
|
* PA === EA)
|
|
*/
|
|
unsigned long peek_into_itlb(unsigned long virtaddr)
|
|
{
|
|
int set, way = -1;
|
|
int i;
|
|
unsigned long tagaddr;
|
|
unsigned long vpn, ppn;
|
|
|
|
if (!(mfspr(SPR_SR) & SPR_SR_IME) || !(testsprbits(SPR_UPR, SPR_UPR_IMP))) {
|
|
return(virtaddr);
|
|
}
|
|
|
|
/* Which set to check out? */
|
|
set = (virtaddr / config.immu.pagesize) % config.immu.nsets;
|
|
tagaddr = (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. */
|
|
for (i = 0; i < config.immu.nways; i++)
|
|
if (((mfspr(SPR_ITLBMR_BASE(i) + set) / (config.immu.pagesize * config.immu.nsets)) == vpn) &&
|
|
testsprbits(SPR_ITLBMR_BASE(i) + set, SPR_ITLBMR_V))
|
|
way = i;
|
|
|
|
/* Did we find our tlb entry? */
|
|
if (way >= 0) { /* Yes, we did. */
|
|
|
|
/* Test for page fault */
|
|
if (mfspr (SPR_SR) & SPR_SR_SM) {
|
|
if (!(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_SXE)) {
|
|
/* no luck, giving up */
|
|
return(0);
|
|
}
|
|
} else {
|
|
if (!(mfspr (SPR_ITLBTR_BASE(way) + set) & SPR_ITLBTR_UXE)) {
|
|
/* no luck, giving up */
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
ppn = mfspr(SPR_ITLBTR_BASE(way) + set) / config.immu.pagesize;
|
|
return (ppn * config.immu.pagesize) + (virtaddr % config.immu.pagesize);
|
|
}
|
|
else {
|
|
return(0);
|
|
}
|
|
|
|
PRINTF("ERR, should never have happened\n");
|
|
return(0);
|
|
}
|
|
|
|
|
unsigned long immu_translate(unsigned long virtaddr)
|
unsigned long immu_translate(unsigned long virtaddr)
|
{
|
{
|
unsigned long phyaddr = immu_simulate_tlb(virtaddr);
|
unsigned long phyaddr = immu_simulate_tlb(virtaddr);
|
|
|
/* PRINTF("IMMU translate(%x) = %x\n", virtaddr, phyaddr);*/
|
/* PRINTF("IMMU translate(%x) = %x\n", virtaddr, phyaddr);*/
|
