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ipmi: add Block Transfer interface support

Reviewed by: ambrisko
Obtained from: Yandex LLC
MFC after: 2 weeks
Sponsored by: Yandex LLC
Differential Revision: https://reviews.freebsd.org/D40421

arm64: enable build of the ipmi module

Only ACPI attachment is supported for now, some others depend on the
presence of smbios(4) support, which we lack on arm64.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D28009

[POWERPC64LE] enable IPMI using OPAL bus

Enable build of IPMI over OPAL on powerpc64le

Reviewed by: bdragon
Sponsored by: Eldorado Research Institute (eldorado.org.br)
Differential Revision: https://reviews.freebsd.org/D27443

Fix a module Makefile error on amd64 so the IPMI HW interfaces are built.
When the module is being unloaded and no HW interfaces were created don't
clean up. This was exposed by the amd64 module build issue.

Add ofw_bus_if.h to the SRCS list for ipmi module on powerpc64

PR: 230194
Reported by: sbruno

Only build ipmi_linux on x86

Somehow this wasn't triggered in my pre-commit build.

Support building IPMI as a module on powerpc64

This still only supports IPMI via OPAL on powerpc64, but now it can be tested
with a GENERIC kernel.

sys/modules: normalize .CURDIR-relative paths to SRCTOP

This simplifies make output/logic

Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
MFC after: 1 month
Sponsored by: Dell EMC Isilon

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Add stuff to support upcoming BMC/IPMI flashing of newer Dell machine
via the Linux tool.
- Add Linux shim to ipmi(4)
- Create a partitions file to linprocfs to make Linux fdisk see
disks. This file is dynamic so we can see disks come and go.
- Convert msdosfs to vfat in mtab since Linux uses that for
msdosfs.
- In the Linux mount path convert vfat passed in to msdosfs
so Linux mount works on FreeBSD. Note that tasting works
so that if da0 is a msdos file system
/compat/linux/bin/mount /dev/da0 /mnt
works.
- fix a 64it bug for l_off_t.
Grabing sh, mount, fdisk, df from Linux, creating a symlink of mtab to
/compat/linux/etc/mtab and then some careful unpacking of the Linux bmc
update tool and hacking makes it work on newer Dell boxes. Note, probably
if you can't figure out how to do this, then you probably shouldn't be
doing it :-)

- Import the HEAD csup code which is the basis for the cvsmode work.

Update the ipmi(4) driver:
- Split out the communication protocols into their own files and use
a couple of function pointers in the softc that the commuication
protocols setup in their own attach routine.
- Add support for the SSIF interface (talking to IPMI over SMBus).
- Add an ACPI attachment.
- Add a PCI attachment that attaches to devices with the IPMI interface
subclass.
- Split the ISA attachment out into its own file: ipmi_isa.c.
- Change the code to probe the SMBIOS table for an IPMI entry to just use
pmap_mapbios() to map the table in rather than trying to setup a fake
resource on an isa device and then activating the resource to map in the
table.
- Make bus attachments leaner by adding attach functions for each
communication interface (ipmi_kcs_attach(), ipmi_smic_attach(), etc.)
that setup per-interface data.
- Formalize the model used by the driver to handle requests by adding an
explicit struct ipmi_request object that holds the state of a given
request and reply for the entire lifetime of the request. By bundling
the request into an object, it is easier to add retry logic to the various
communication backends (as well as eventually support BT mode which uses
a slightly different message format than KCS, SMIC, and SSIF).
- Add a per-softc lock and remove D_NEEDGIANT as the driver is now MPSAFE.
- Add 32-bit compatibility ioctl shims so you can use a 32-bit ipmitool
on FreeBSD/amd64.
- Add ipmi(4) to i386 and amd64 NOTES.

Submitted by: ambrisko (large portions of 2 and 3)
Sponsored by: IronPort Systems, Yahoo!
MFC after: 6 days

Add an OpenIPMI mostly compatible driver. This driver was developed
to work with ipmitools. It works with other tools that have an OpenIPMI
driver interface. The port will need to get updated to used this.
I have not implemented the IPMB mode yet so ioctl's for that don't
really do much otherwise it should work like the OpenIPMI version.
The ipmi.h definitions was derived from the ipmitool header file.
The bus attachments are done for smbios and pci/smbios. Differences
in bus probe order for modules/static are delt with. ACPI attachment
should be done.

This drivers registers with the watchdod(4) interface

Work to do:
- BT interface
- IPMB mode

This has been tested on Dell PE2850, PE2650 & PE850 with i386 & amd64
kernel.

I will link this into the build on next week.

Tom Rhodes, helped me with the man page.

Sponsored by: IronPort Systems Inc.
Inspired from: ipmitool & Linux