If you use UEFI boot, have EFIRT compiled in kernel (the case of
GENERIC) or pre-loaded as module, and efirt is not disabled by a tunable,
and the machine resets during kernel initialization, try this.
diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index d5d795ab502..c9334eab916 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -1188,7 +1188,7 @@ pmap_bootstrap(vm_paddr_t *firstaddr)
kernel_pmap->pm_pcids[i].pm_pcid = PMAP_PCID_KERN;
kernel_pmap->pm_pcids[i].pm_gen = 1;
}
- PCPU_SET(pcid_next, PMAP_PCID_KERN + 1);
+ PCPU_SET(pcid_next, PMAP_PCID_KERN + 2);
PCPU_SET(pcid_gen, 1);
/*
* pcpu area for APs is zeroed during AP startup.
@@ -2651,8 +2651,8 @@ pmap_pinit0(pmap_t pmap)
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
pmap->pm_flags = pmap_flags;
CPU_FOREACH(i) {
- pmap->pm_pcids[i].pm_pcid = PMAP_PCID_NONE;
- pmap->pm_pcids[i].pm_gen = 0;
+ pmap->pm_pcids[i].pm_pcid = PMAP_PCID_KERN + 1;
+ pmap->pm_pcids[i].pm_gen = 1;
if (!pti) {
__pcpu[i].pc_kcr3 = PMAP_NO_CR3;
__pcpu[i].pc_ucr3 = PMAP_NO_CR3;
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