MFC r341101, r341231, r341276, r341329, r341433, r341780, r342054-r342055,
r342721, r342742, r342840, r343008, r343225

r341101:
powerpcspe: Don't crash the loader on ubldr with SPE instructions.

-msoft-float seems to be insufficient for disabling the SPE on powerpcspe.
Force it off with -mno-spe as well. This prevents a crash in ubldr on
powerpcspe.

r341231:
loader: command_bcache() should print unsigned values

All bcache counters are unsigned.

r341276:
When handling CMD_CRIT error set command_errmsg to NULL after we dump it out,
so that it does not result in error message printed twice.

OK load doodoo
can't find 'doodoo'
can't find 'doodoo'
OK

r341329:
loader.efi: fix EFI getchar() for multiple consoles

This fix is ported from illumos (issue #9970), the analysis and initial
implementation was done by John Levon.

See also: https://www.illumos.org/issues/9970

Currently, efi_cons_getchar() will wait for a key. While this seems to make
sense, the implementation of getchar() in common/console.c will loop across
getchar() for all consoles without doing ischar() first.

This means that if we've configured multiple consoles, we can't input into
the serial, as getchar() will be sat waiting for input only from efi_console.c

This patch does implement a bit more generic key buffer to support
translation of input keys, and we use generic efi_readkey() to reduce
duplication from calls from getchar() and poll().

r341433:
Move inclusion of src.opts.mk later.

src.opts.mk includes bsd.own.mk. This in turn defines CTFCONVERT_CMD
depending on the MK_CTF value. We then set MK_CTF to no, which has no
real effect. The solution is to set all the MK_foo values before
including src.opts.mk.

This should stop the cdboot binary from exploding in size for releases
built WITH_CTF=yes in src.conf.

r341780:
powerpc/ubldr: Teach powerpc's ubldr to boot 64-bit kernels

This is just a copy of powerpc/ofw's ppc64_elf_freebsd.c modified to fit
ubldr's boot format.

r342054:
Print an error message in efi_main.c if we can't allocate memory for the heap

With the default Qemu parameters, only 128MB RAM gets given to a VM. This causes
the loader to be unable to allocate the 64MB it needs for the heap. This change
makes the cause of the error more obvious.

r342055:
Cast error message in efi_main.c to CHAR16* to avoid build error

r342721:
loader.efi: update memmap command to recognize new attributes

Also move memory type to string translation to libefi for later use.

r342742:
loader.efi: efi variable rework and lsefi command added

This update does add diag and debug capabilities to interpret the efi
variables, configuration and protocols (lsefi).

The side effect is that we add/update bunch of related headers.

r342840:
Create MK_LOADER_VERBOSE and connect it to ELF_VERBOSE in the loader
code.

r343008:
Add Dell Chromebook to the list of devices with E820 extmem quirk enabled

Just like for Acer C270 chromebook the E820 extmem workaround is required for
FreeBSD to boot on Dell chromebook.

r343225:
Unbreak mip64 build after r328437

Add exit and getchar functions to beri/boot2 code. They are required by
panic_action functin introduced in r328437

PR: 18498, 204916

MFC r325834,r325997,326502: Move sys/boot to stand/

This is effectively a direct commit to stable/11, due to differences between
stable/11 and head. Changes to DTS in sys/boot/fdt/dts were often
accompanied by kernel changes. Many of these were also risc-v updates that
likely had many more dependencies to MFC.

Because of this, sys/boot/fdt/dts remains as-is while everything else in
sys/boot relocates to stand/.

r325834: Move sys/boot to stand. Fix all references to new location

r325997: Remove empty directories.

r326502: Document the sys/boot -> stand move in hier.7 and the top-level README.

MFC Loader Fixes 2017q2: r316437,r316577,r316578,r316585,r316590,r316612,
r316625,r316628,r316654,r316682,r316704,r316771,r317092,r317097,r317099,
r317652,r317785,r317886,r317887,r318142,r318320,r318356,r318678,r318754,
r318982,r318986,r318987,r318988,r318989,r318990,r318991,r318992,r318993,
r318994,r318999,r319083,r319084,r319085,r320011,r320234,r320288,r320304,
r320467,r320482

r316437: Small cleanup to make i386/loader match efi/loader boot environment
code

r316577: loader: part.c cstyle cleanup

r316578: loader: want mechanism to avoid RA with bcache

r316585: loader: zfs reader should check all labels

r316590: libstand/dosfs: cache FAT32 in 128 Kb blocks to save loader memory

r316612: In r298230 the value of HEAP_MIN was changed from 3MB to 64MB.
Correct a comment.

r316625: Do not use -msoft-float with intention of disabling FP on aarch64

r316628: Silence GCC warning by initializing the local variable.

r316654: loader: r316585 did miss userboot update

r316682: loader: r316585 did miss sparc/ofw

r316704: loader.efi: only fetch zfs pool guid for the actual boot device

r316771: loader: Avoid possible overflow via environment variable

r317092: loader: zfs reader vdev_probe should check for minimum device size

r317097: loader: F_READ/F_WRITE should be checked against masked flag

r317099: loader: uboot disk ioctl should call disk_ioctl

r317652: loader.efi: ResetSystem does not use data with EFI_SUCCESS

r317785: zfsboot: drvsize() may be unusable on some systems

r317886: distinguish NFS versus TFTP boot by rootpath

r317887: loader: network read rework

r318142: libstand: NULL pointer dereference in rarp

r318320: loader: add ip layer code into libstand

r318356: libstand: increase nfs max read size to 16k

r318678: Replacing iterating over rootpath by strsep(3).

r318754: Pass -N directly to ld via -Wl rather than passing it to the
compiler driver.

r318982: Pass a "FREEBSD" user-class in PXE dhcp request

r318986: add a comment on vendor index 19 and 20 to avoid confusion

r318987: Support URI scheme for root-path in netbooting

r318988: Always build tftpfs support along with nfs for pxeboot

r318989: Always issue the pxe request

r318990: Partially revert r314948

r318991: Document recent changes on pxeboot

r318992: Capitalize DHCP

r318993: Use the usual FreeBSD spelling for the DHCP user class

r318994: Catch with the change in the user class

r318999: Update the comments concerning net_parse_rootpath to reflect what
it is now

r319083: Followup on the user-class changes

r319084: Small cleanup in dev_net.c

r319085: use the same option list for dhcp discovery and request

r320011: Add chain loader support for loader

r320234: Make structure padding explicit in EFI_MEMORY_DESCRIPTOR

r320288: Allow Clang's integrated assembler to assemble boot0

r320304: loader.efi: Disable smbios for arm

r320467: loader: chain load relocate data declaration is bad

r320482: As with arm64 mark the EFI PE header as allocated on arm.

PR: 218473

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Revert accidental whitespace changes included with r292623

Support a.out format in nlist only on i386

i386 is the only current FreeBSD architecture that ever used a.out
format.

Reviewed by: kib
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D4687

Allow EFI and ACPI to be included together. When ACPI is included
first, EFI will use its definitions for {,U}INT{8,16,32,64} and
BOOLEAN. When EFI is included first, define ACPI_USE_SYSTEM_INTTYPES
to tell ACPI that these are already defined.

Differential Revision: https://reviews.freebsd.org/D1905

Sync the EFI headers with version 1.10.14.62 of the Intel sample EFI
implementation. This re-introduces C99 style comments that previously
were replaced by original C comments.

An almost mechanical sweep to replace C++ style comments with C
style comments. This is not an attempt to conform to style(9).
Such has lower priority.

First approximation of an ia64 EFI loader. Not functional.