2ba6fe0009
it by a transient double mapping for the one instruction in ACPI wakeup where it is needed (and for many surrounding instructions in ACPI resume). Invalidate the TLB as soon as convenient after undoing the transient mapping. ACPI resume already has the strict ordering needed for this. This fixes the non-trapping of null pointers and other garbage pointers below NBPDR (except transiently). NBPDR is quite large (4MB, or 2MB for PAE). This fixes spurious traps at the first instruction in VM86 bioscalls. The traps are for transiently missing read permission in the first VM86 page (physical page 0) which was just written to at KERNBASE in the kernel. The mechanism is unknown (it is not simply PG_G). locore uses a similar but larger transient double mapping and needs it for 2 instructions instead of 1. Unmap the first PDE in it after the 2 instructions to detect most garbage pointers while bootstrapping. pmap_bootstrap() finishes the unmapping. Remove the avoidance of the double mapping for a recently fixed special case. ACPI resume could use this avoidance (made non-special) to avoid any problems with the transient double mapping, but no such problems are known. Update comments in locore. Many were for old versions of FreeBSD which tried to map low memory r/o except for special cases, or might have allowed access to low memory via physical offsets. Now all kernel maps are r/w, and removal of of the double map disallows use of physical offsets again.
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