943defc3a0
pagetables. physmap[] can be inconsistent with the physical memory limit due to buggy bios, or to the hw.physmem tunable. Since bootstrap pagetables are initialized by accesses through the DMAP, we must ensure that DMAP really cover the selected pages. This is only relevant when machine has less than 4G RAM and buggy BIOS, which is the combination on Acer Chromebook 720. The call to mp_bootaddress() is moved later to have Maxmem initialized. An alternative could be to always cover 4G for DMAP, but this change seems to be simpler. Reported and tested by: grembo Reviewed by: royger Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D15675
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