# 64 byte NVMe Identify controller command (an Admin command) that is
# suitable for:
#       sg_raw --cmdfile=<this_file_name> --request=4096 <nvme_device>
#
# The address field (at byte offset 24, 8 bytes and little endian) gives
# special meaning to the highest address pointers:
#    ffffffff fffffffe         use address of data-in buffer
#    ffffffff fffffffd         use address of data-out buffer
#
# The data length field (at byte offset 36, 4 bytes and little endian)
# gives special meaning to the highest block counts:
#    fffffffe                  use byte length of data-in buffer
#    fffffffd                  use byte length of data-out buffer
#
# Since The Identify command reads data "in" from the device, then the
# data-in buffer is appropriate.

06 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00  fe ff ff ff ff ff ff ff
00 00 00 00 fe ff ff ff  01 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00

# A typical invocation in Linux and FreeBSD would look like this:
#    sg_raw --cmdfile=nvme_identify_ctl.hex -r 4k /dev/nvme0
#
# NVMe likes "4k" (4096 bytes) buffer size, preferably aligned to
# a 4096 byte (or "page") boundary.