[patch 09/12 v4] x86: export x86 boot_params to sysfs (no replies)

Hi,
References: <20131125085630.417850406@dhcp-16-126.nay.redhat.com>
Content-Disposition: inline; filename=09-add-sysfs-boot-param.patch

kexec-tools use boot_params for getting the 1st kernel hardware_subarch,
the kexec kernel efi runtime support also need read the old efi_info from
boot_params. Currently it exists in debugfs which is not a good place for
such infomation. Per HPA, we should avoid of "sploit debugfs".

In this patch /sys/kernel/boot_params are exported, also the setup_data
is exported as a subdirectory. For original debugfs since it's already
there for long time and kexec-tools is using it for hardware_subarch so
let's do not remove them for now.

Structure are like below:

/sys/kernel/boot_params