used with hashed page tables on AIM and place it into a new, modular pmap
function called pmap_decode_kernel_ptr(). This function is the inverse
of pmap_map_user_ptr(). With POWER9 radix tables, which mapping to use
becomes more complex than just AIM/BOOKE and it is best to have it in
the same place as pmap_map_user_ptr().
Reviewed by: jhibbits
gone_in(majar, msg); If we're running in FreeBSD major, tell
the user this code may be deleted soon.
If we're running in FreeBSD major - 1,
the the user is deprecated and will
be gone in major.
Otherwise say nothing.
gone_in_dev(dev, major, msg) Just like gone_in, except use device_printf.
New tunable / sysctl debug.oboslete_panic: 0 - don't panic,
1 - panic in major or newer , 2 - panic in major - 1 or newer
default: 0
if NO_OBSOLETE_CODE is defined, then both of these turn into compile
time errors when building for major. Add options NO_OBSOLETE_CODE to
kernel build system.
This lets us tag code that's going away so users know it will be gone,
as well as automatically manage things.
Differential Review: https://reviews.freebsd.org/D13818
optimize away these loops. Change boolean to int to match what atomic
API supplies. Remove wmb() since the atomic_store_rel() on status.done
ensure the prior writes to status. It also fixes the fact that there
wasn't a rmb() before reading done. This should also be more efficient
since wmb() is fairly heavy weight.
Sponsored by: Netflix
Reviewed by: kib@, jim harris
Differential Revision: https://reviews.freebsd.org/D14053
There's no reason not to build modules for 64-bit QorIQ devices. This
config has evolved to be analogous to the AIM GENERIC64 kernel, so will grow
to match it in more ways as well.
We removed the nonnull attributes from our headers long ago, but still
__printflike() includes it implicitly. This will cause the NULL check to
be optimized away in higher -O levels and it will also trigger a
-Wnonnull-compare warning.
Avoid warning with it in vwarnx().
Obtained from: DragonfLyBSD (git 6329e2f68af73662a1960240675e796ab586bcb1)
Summary:
Rather than duplicating the checks for programmatic traps all over the code, put
it all in one function. This helps to remove some of the #ifdefs between AIM
and Book-E.
Reviewed By: nwhitehorn
Differential Revision: https://reviews.freebsd.org/D14082
[X86] Make -mavx512f imply -mfma and -mf16c in the frontend like it
does in the backend.
Similarly, make -mno-fma and -mno-f16c imply -mno-avx512f.
Withou this "-mno-sse -mavx512f" ends up with avx512f being enabled
in the frontend but disabled in the backend.
Reported by: pawel
PR: 225488
- pmap_enter_object() can be used for mapping of executable pages, so it's
necessary to handle I-cache synchronization within it.
- Fix race in I-cache synchronization in pmap_enter(). The current code firstly
maps given page to target VA and then do I-cache sync on it. This causes
race, because this mapping become visible to other threads, before I-cache
is synced.
Do sync I-cache firstly (by using DMAP VA) and then map it to target VA.
- ARM64 ARM permits implementation of aliased (AIVIVT, VIPT) I-cache, but we
can use different that final VA for flushing it. So we should use full
I-cache flush on affected platforms. For now, and as temporary solution,
use full flush always.
"Fix gcc80 -Wsizeof-pointer-memaccess warning."
The warning is bogus: GCC8 only looks at the size of the destination.
We shouldn't be fixing imaginary problems, so perhaps its better to deal
with this later on by disabling such warnings.
Pointed out by: ed, bde
Example overlays seen in other places use a compatible property on root node
of an overlay to specify SOC compatibility. These don't get merged into base
FDT as they're not part of a fragment, but it's expected that consumers of
the overlay may want to check it.
If /compatible on the overlay is missing, just apply it. This is the "I know
what I'm doing" mode for those wanting to whip up a quick overlay and apply
it. An overlay intended for distribution should include /compatible so as
not to break a user's system.
If /compatible on the overlay exists, honor it and cross-check it with
/compatible on the base FDT. If /compatible on the base FDT is missing in
this case, don't apply the overlay rather than risk breaking the system.
Move the COPYOUT of overlay material to before we allocate space for
next_fdtp so that we can avoid the allocation and copy into next_fdtp if we
already know that the overlay can't apply.
This gives way to the possibility of autoloading overlays found in
/boot/overlays, since this provides a means of filtering out overlays not
applicable to the current board.
Reviewed by: gonzo
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D13969
This should have been done as part of r327350, but due to lack of foresight
it came later. In the different places we apply overlays, we duplicate the
bits that check for fdt_overlays in the environment and supplement that with
any other places we need to check for overlays to load. These "other places"
will be loader specific and are not candidates for consolidation.
Provide an fdt_load_dtb_overlays to capture the common logic, allow passing
in an additional list of overlays to be loaded. This additional list of
overlays is used in practice for ubldr to pull in any fdt_overlays passed to
it from U-Boot environment, but it can be used for any other source of
overlays.
These additional overlays supplement loader.conf(5) fdt_overlays, rather
than replace, so that we're not restricted to specifying overlays in only
one place. This is a change from previous behavior where loader.conf(5)
supplied fdt_overlays would cause us to ignore U-Boot environment, and this
seems nonsensical- user should have sufficient control over both of these
aspects, or lack of control for good reasons.
A knob could be considered in the future to ignore U-Boot supplied overlays,
but the supplemental treatment seems like a good start.
Reviewed by: imp (earlier version), gonzo (earlier version)
Differential Revision: https://reviews.freebsd.org/D13993
Previously, MAKESYSPATH as well as '-m' directives in MAKEFLAGS would cause
any port rebuilt during the PORTS_MODULES stage to consume system makefiles
from $(SRCROOT)/share/mk instead of those installed under /usr/share/mk.
For kernel modules that need to build against an updated src tree this
makes sense; less so for <bsd.port.mk> or any userspace library or utility
the port may also happen to install.
Before 11.0, this probably didn't matter much in practice. But the addition
of src.libnames.mk under $(SRCROOT)/share/mk in 11.0 breaks any consumer of
bsd.prog.mk and DPADD/LDADD during PORTS_MODULES.
Address the build breakage by removing MAKESYSPATH and any occurrence of
'-m' from MAKEFLAGS in the environment created for the port build.
Instead set SYSDIR so that any kmod built by the port will still consume
conf/kmod.mk from the updated src tree, assuming it uses <bsd.kmod.mk>
Reviewed by: bdrewery
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D13053
larger than or equal to 32 bytes. For smaller probe packets, keep using
SHUTDOWN-ACK chunks, possibly bundled with a PAD chunk.
Packets with INIT chunks more likely pass through firewalls. Therefore,
use them when possible.
MFC after: 1 week
Use a setup_sig() helper and make it fail when either of sigaction fails.
While there, do not leak fds for "." + minor cleanup.
Obtained from: OpenBSD (through DragonFly git eca362d0f9bd086cc56d6b5bc4f03f09e040b9db)
Sanitize the values that will be assigned to ncookies so that we ensure
they are sane and we can handle them.
Let ncookies signed as it was before r328346. The valid range is such
that unsigned values are not required and we are not able to avoid at
least one cast anyways.
Hinted by: bde
Use PCID to avoid complete TLB shootdown when switching between user
and kernel mode with PTI enabled.
I use the model close to what I read about KAISER, user-mode PCID has
1:1 correspondence to the kernel-mode PCID, by setting bit 11 in PCID.
Full kernel-mode TLB shootdown is performed on context switches, since
KVA TLB invalidation only works in the current pmap. User-mode part of
TLB is flushed on the pmap activations as well.
Similarly, IPI TLB shootdowns must handle both kernel and user address
spaces for each address. Note that machines which implement PCID but
do not have INVPCID instructions, cause the usual complications in the
IPI handlers, due to the need to switch to the target PCID temporary.
This is racy, but because for PCID/no-INVPCID we disable the
interrupts in pmap_activate_sw(), IPI handler cannot see inconsistent
state of CPU PCID vs PCPU pmap/kcr3/ucr3 pointers.
On the other hand, on kernel/user switches, CR3_PCID_SAVE bit is set
and we do not clear TLB.
I can imagine alternative use of PCID, where there is only one PCID
allocated for the kernel pmap. Then, there is no need to shootdown
kernel TLB entries on context switch. But copyout(3) would need to
either use method similar to proc_rwmem() to access the userspace
data, or (in reverse) provide a temporal mapping for the kernel buffer
into user mode PCID and use trampoline for copy.
Reviewed by: markj (previous version)
Tested by: pho
Discussed with: alc (some aspects)
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks
Differential revision: https://reviews.freebsd.org/D13985
When PTI is enabled, empty IDT slots point to rsvd_pti.
Reported by: Dexuan-BSD Cui <dexuan.bsd@gmail.com>
Sponsored by: The FreeBSD Foundation
MFC after: 5 days
Similarly as we already do for arm64, for mitigation is necessary to
flush branch predictor when we:
- do task switch
- receive prefetch abort on non-userspace address
The user can disable this mitigation by setting 'machdep.disable_bp_hardening'
sysctl variable, or it can check actual system status by reading
'machdep.spectre_v2_safe'
The situation is complicated by fact that:
- for Cortex-A8, the BPIALL instruction is effectively NOP until the IBE bit
in ACTLR is set.
- for Cortex-A15, the BPIALL is always NOP. The branch predictor can be
only flushed by doing ICIALLU with special bit (Enable invalidates of BTB)
set in ACTLR.
Since access to the ACTLR register is locked to secure monitor/firmware on
most boards, they will also need update of firmware / U-boot.
In worst case, when secure monitor is on-chip ROM (e.g. PandaBoard),
the board is unfixable.
MFC after: 2 weeks
Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D13931
- special fault handling for break-before-make mechanism should be also
applied for instruction translation faults, not only for data translation
faults.
- since arm64_address_translate_...() functions are not atomic,
use these with disabled interrupts.
