K 10
svn:author
V 6
kevans
K 8
svn:date
V 27
2021-10-17T18:47:24.071316Z
K 7
svn:log
V 531
Use adrp in the arm64 efi loader

On startup the arm64 efi loaders need to know PC-relative addresses.
Previously we used the adr instruction to find this address, however this
instruction is limited to +/- 1MiB.

Switch to adrp to find the 4k page the address is within and an add to
set the bottom 12 bits. This lets us address +/- 4GiB which should be
large enough for now.

(cherry picked from commit b9aa4537b2155a0b0bb419ff05b8da206c02bfbd)

Git Hash:   438448dd9fb50720cc289b63892c12b6c8c34e5f
Git Author: andrew@FreeBSD.org
END