This commit adds read/write functions for both big and little endian interpretations. Additionally there are variants that allow an offset to be provided into the source buffer. BUG=None TEST=Wrote test harness for functions. Also booted ARM QEMU through end of payload. Change-Id: If44c4d489f0dab86a73b73580c039e364c7e517d Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/11677 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>