Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Fix some modules to export more used symbols

and remove non-present symbols that are now reported by kmod_syms.awk.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differ

Fix some modules to export more used symbols

and remove non-present symbols that are now reported by kmod_syms.awk.

Reviewed by: emaste
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D32878

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MFHead @349234

Sponsored by: The FreeBSD Foundation

Add missing DPSRCS entry for assym.inc.

This brings in various CLEANFILES/DEPENDOBJS handling.

MFC after: 2 weeks
Sponsored by: DellEMC

MFHead@r345677

Fix `make` in sys/modules

Sponsored by: The FreeBSD Foundation

Merge ^/head r338392 through r338594.

Catch exceptions during EFI RT calls on amd64.

This appeared to be required to have EFI RT support and EFI RTC
enabled by default, because there are too many reports of faulting
calls on many differ

Catch exceptions during EFI RT calls on amd64.

This appeared to be required to have EFI RT support and EFI RTC
enabled by default, because there are too many reports of faulting
calls on many different machines. The knob is added to leave the
exceptions unhandled to allow to debug the actual bugs.

Reviewed by: kevans
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Approved by: re (rgrimes)
Differential revision: https://reviews.freebsd.org/D16972

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Merge ^/head r325999 through r326131.

Add a driver for the EFI RTC. This uses the EFI Runtime Services to query
the system time.

As we seem to only read this time on boot, and this is the only source of
time on many arm64 machines we ne

Add a driver for the EFI RTC. This uses the EFI Runtime Services to query
the system time.

As we seem to only read this time on boot, and this is the only source of
time on many arm64 machines we need to enable this by default there. As
this is not always the case with U-Boot firmware, or when we have been
booted from a non-UEFI environment we only enable the device driver when
the Runtime Services are present and reading the time doesn't result in an
error.

PR: 212185
Reviewed by: imp, kib
Tested by: emaste
Relnotes: yes
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D12650

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Merge ^/head r323559 through r325504.

MFhead@r324482

To prepare for adding EFI runtime services support on arm64 move the
machine independent parts of the existing code to a new file that can be
shared between amd64 and arm64.

Reviewed by: kib (previo

To prepare for adding EFI runtime services support on arm64 move the
machine independent parts of the existing code to a new file that can be
shared between amd64 and arm64.

Reviewed by: kib (previous version), imp
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D12434

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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

Merge ^/head r306906 through r307382.

Create /dev/efidev to provide an ioctl interface to
userland. It supports userland interfaces to UEFI Runtime Services. This is
indended to the the MI portion of EFI RuntimeServices support.

Differ

Create /dev/efidev to provide an ioctl interface to
userland. It supports userland interfaces to UEFI Runtime Services. This is
indended to the the MI portion of EFI RuntimeServices support.

Differential Revision: https://reviews.freebsd.org/D8128
Reviewed by: kib@, wblock@, Ganael Laplanche

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Merge ^/head r305892 through r306302.

Hopefully, fix build of the module outside the kernel tree.

Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

Add kernel interfaces to call EFI Runtime Services.

Runtime services require special execution environment for the call.
Besides that, OS must inform firmware about runtime virtual memory map
which

Add kernel interfaces to call EFI Runtime Services.

Runtime services require special execution environment for the call.
Besides that, OS must inform firmware about runtime virtual memory map
which will be active during the calls, with the SetVirtualAddressMap()
runtime call, done while the 1:1 mapping is still used. There are two
complication: the SetVirtualAddressMap() effectively must be done from
loader, which needs to know kernel address map in advance. More,
despite not explicitely mentioned in the specification, both 1:1 and
the map passed to SetVirtualAddressMap() must be active during the
SetVirtualAddressMap() call. Second, there are buggy BIOSes which
require both mappings active during runtime calls as well, most likely
because they fail to identify all relocations to perform.

On amd64, we can get rid of both problems by providing 1:1 mapping for
the duration of runtime calls, by temprorary remapping user addresses.
As result, we avoid the need for loader to know about future kernel
address map, and avoid bugs in BIOSes. Typically BIOS only maps
something in low 4G. If not runtime bugs, we would take advantage of
the DMAP, as previous versions of this patch did.

Similar but more complicated trick can be used even for i386 and 32bit
runtime, if and when the EFI boot on i386 is supported. We would need
a trampoline page, since potentially whole 4G of VA would be switched
on calls, instead of only userspace portion on amd64.

Context switches are disabled for the duration of the call, FPU access
is granted, and interrupts are not disabled. The later is possible
because kernel is mapped during calls.

To test, the sysctl mib debug.efi_time is provided, setting it to 1
makes one call to EFI get_time() runtime service, on success the efitm
structure is printed to the control terminal. Load efirt.ko, or add
EFIRT option to the kernel config, to enable code.

Discussed with: emaste, imp
Tested by: emaste (mac, qemu)
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

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