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Move efi_read_from_pa, efi_set_systbl and efi_bi_loadsmap into efi.c
Move prototype for populate_avail_from_efi as well, though that arrived
previously.
Move efi memory map variables into efi.c.
Add efi_read_from_sysfs, but if 0 it out. We'll want to use it if we can
get the proposed /sys/firmware/efi/memmap data published in the same
format and the code works, it's just that the current
/sys/firmware/efi/runtime-memmap isn't complete enough to use.
Sponsored by: Netflix
Reviewed by: kevans, jhibbits
Differential Revision: https://reviews.freebsd.org/D49863
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If we can get an efi memory map, populate_avail_from_efi will create an
avail array. We only use the regiions marked as 'free' to find a place
for the kernel to land. The other regions are also eligible, but usually
too small to materially affect where we'd put the kernel (not to worry,
the kernel will use that memory).
Sponsored by: Netflix
Reviewed by: kevans, jhibbits
Differential Revision: https://reviews.freebsd.org/D49862
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Start to move the common efi routines into libkboot by moving the efi
memory map walking and implementing a printing routine around it.
Sponsored by: Netflix
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