some TLS bits. This broke operation on the PowerMac. Namely one could not login.
At login the screen/shell was giving back lots of backslashes and the login
shell dumped core.

The fix to this issue is to revert the powerpc commit from 338486 and to
increase the TLS_TCB_SIZE to 16.
Reverting only did not help, login was possible but userland applications
aborted with strange messages.

I tested this patch with world/kernel builds and with port upgrades.
Additionally a full gcc8 bootstrap was successfully completed.

Reviewed by: jhibbits@
Approved by: re (Glen)

Reported by:	Mark Millard
Approved by:	re (gjb)
Sponsored by:	The FreeBSD Foundation

For pmap_invalidate_all_pcid(), only reset pm_gen for non-kernel
pmaps, as it was done before the conversion to ifuncs.  The reset is
useless but innocent for kernel_pmap. Coverity reported that cpuid is
used uninitialized in this case.

Reported by:	cem
Reviewed by:	alc, cem, markj
CID:	 1395807
Sponsored by:	The FreeBSD Foundation
Approved by:	re (gjb)
Differential revision:	https://reviews.freebsd.org/D17314

Currently vfs calls the root method on each absolute lookup and when
crossing mount points.

zfs_root ends up looking up the inode internally as if it was not
instantianted which results in significant lock contention on systems
like EPYC.

Store the vnode in the mount point and protect the access with rmlocks.
This is a temporary hack for 12.0.

Sample result:

before:
make -s -j 128 buildkernel 2778.09s user 3319.45s system 8370% cpu 1:12.85 total

after:
make -s -j 128 buildkernel 3199.57s user 1772.78s system 8232% cpu 1:00.40 total

Tested by:	pho (zfs mount/unmount tests)
Reviewed by:	kib, mav, sef (different parts)
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D17233

This is a direct commit to a generated file.  Simon plans to fix this
upstream before the next import.

PR:		231557
Approved by:	re (gjb)
Obtained from:	CheriBSD
Sponsored by:	DARPA, AFRL

The PHB4 host bridge used by the POWER9 uses a 64kB range in 32-bit
space at the address 0xffff0000-0xffffffff.  Reserve this range so that
DMA memory cannot be allocated within this range.  This fixes seemingly
random crashes on a POWER9 system.  Ideally this range will have been
reserved by the firmware, but as of now this is not the case.

Submitted by:	git_bdragon.rtk0.net
Reviewed by:	nwhitehorn
Approved by:	re(kib)
Differential Revision:	https://reviews.freebsd.org/D17183

as an NS8250 UART.

Reviewed by:	sbruno, imp
Approved by:	re (delphij)
Sponsored by:	https://www.patreon.com/cperciva
Differential Revision:	https://reviews.freebsd.org/D17250

Reviewed by:	bcr
Approved by:	re (gjb), krion (mentor)
Differential Revision:	https://reviews.freebsd.org/D17147

Use these predicates instead of inline references to vm_min_domains.
Also add a global all_domains set, akin to all_cpus.

Reviewed by:	alc, jeff, kib
Approved by:	re (gjb)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17278

When I updated counter definition handling for x86 I broke
'pmccontrol -L' listing counter names. This just changes
pmccontrol to call the library function on x86.

PR:	230984
Approved by:	re (kib@)

In 11.x and earlier these were accessible as direct members of 'struct
kinfo_file'.  Existing code already knows about the new location of
these members as well, so wrapper macros did not work for these
fields.  Instead, define an anonymous struct containing the fields
from 'struct kinfo_file' in FreeBSD 11 that were not part of the
'kf_un' union.  This anonymous struct is then placed in an anonymous
union along with the new 'kf_un' union.  This preserves the API of
both structure layouts without requiring any wrapper macros.

PR:		231525
Reviewed by:	kib
Approved by:	re (gjb)
Differential Revision:	https://reviews.freebsd.org/D17262

This invokes "fence" on the hart performing the write followed by an IPI
to execute "fence.i" on all harts.

This is required to support userland debuggers setting breakpoints in
user processes.

Reviewed by:	br (earlier version), markj
Approved by:	re (gjb)
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D17139