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remove xhat
The xhat infrastructure was added to support hardware such as the zulu
graphics card - hardware which had on-board MMUs. The VM used the xhat code
to keep the CPU's and Zulu's page tables in-sync. Since the only xhat user
was zulu (which is gone), we can safely remove it simplifying the whole VM
subsystem.
Assorted notes:
- AS_BUSY flag was used solely by xhat
@@ -1682,12 +1682,10 @@
for (sfhmep = pp->p_mapping; sfhmep; sfhmep = tmphme) {
tmphme = sfhmep->hme_next;
if (IS_PAHME(sfhmep))
continue;
hmeblkp = sfmmu_hmetohblk(sfhmep);
- if (hmeblkp->hblk_xhat_bit)
- continue;
tmphat = hblktosfmmu(hmeblkp);
sfmmu_copytte(&sfhmep->hme_tte, &tte);
ASSERT(TTE_IS_VALID(&tte));
if ((tmphat == ksfmmup) || hmeblkp->hblk_lckcnt) {
/*
@@ -1707,12 +1705,10 @@
for (sfhmep = pp->p_mapping; sfhmep; sfhmep = tmphme) {
tmphme = sfhmep->hme_next;
if (IS_PAHME(sfhmep))
continue;
hmeblkp = sfmmu_hmetohblk(sfhmep);
- if (hmeblkp->hblk_xhat_bit)
- continue;
(void) sfmmu_pageunload(pp, sfhmep, TTE8K);
}
/*
* Unloads only does tlb flushes so we need to flush the