This is really confusing, let's try to clean this up a bit, in
particular as there are two very similar concepts:
1. The boot loaders, i.e. the category you find systemd-boot, the
Windows and Apple boot loaders in. These may typically be listed in the
firmware's EFI variables.
2. The boot loader entries, as defined by the Boot Loader Spec. In this
category you find the various Linux kernels that are installed, i.e.
the stuff systemd-boot shows on screen. To make things confusing, the
Windows and Apple boot loaders can appear both as boot loaders and as
boot loader entries.
This tries to establish the following nomenclature: "boot loaders" and
"boot loader entries" for these two concepts.
boot_loader_read_conf(), boot_entries_find(), boot_entries_load_config()
all log their errors internally, hence no need to log a second or third
time about the same error when they return.
We already synchronize all files we write individually, as well as the
directories they are stored in. Let's also synchronize the ESP as a
whole after our work, just in case.
cross building systemd to arm64 presently fails, because the build
system uses plain gcc and plain ld (build architecture compiler and
linker respectively) for building src/boot/efi. These values come from
the efi-cc and efi-ld options respectively. It rather should be using
host tools here.
Fixes: b710072da4 ("add support for building efi modules")
Back in 08318a2c5a, value "false" was enabled for
'-Dtests=', but various tests were not conditionalized properly. So even with
-Dtests=false -Dslow-tests=false we'd run 120 tests. Let's make this consistent.
On Dell machines LoadOptions is filled with:
01 00 00 00 <name of BIOS Boot Loader Entry> ... <unknown bytes>
So, in case of meaningfull LoadOptions, better check if the first char
is a printable character.
This is a bit like the info link in most of GNU's --help texts, but we
don't do info but man pages, and we make them properly clickable on
terminal supporting that, because awesome.
I think it's generally advisable to link up our (brief) --help texts and
our (more comprehensive) man pages a bit, so this should be an easy and
straight-forward way to do it.
Meson does not care either way, so let's use the simpler syntax. And files()
already gives a list, so nesting this in a list wouldn't be necessary even
if meson did not flatten everything.
$ git grep -e 'This program is free software' -l |grep -v LICENSE | \
xargs perl -i -0pe 's/ \* This program.*?for more details.\s*\*\n( \* You should have.*licenses.>.\n)?//gms'
For some reason they were missed previously. All those files seem to
have proper SDPX tags.
These lines are generally out-of-date, incomplete and unnecessary. With
SPDX and git repository much more accurate and fine grained information
about licensing and authorship is available, hence let's drop the
per-file copyright notice. Of course, removing copyright lines of others
is problematic, hence this commit only removes my own lines and leaves
all others untouched. It might be nicer if sooner or later those could
go away too, making git the only and accurate source of authorship
information.
This part of the copyright blurb stems from the GPL use recommendations:
https://www.gnu.org/licenses/gpl-howto.en.html
The concept appears to originate in times where version control was per
file, instead of per tree, and was a way to glue the files together.
Ultimately, we nowadays don't live in that world anymore, and this
information is entirely useless anyway, as people are very welcome to
copy these files into any projects they like, and they shouldn't have to
change bits that are part of our copyright header for that.
hence, let's just get rid of this old cruft, and shorten our codebase a
bit.
UINTN is the integer type equalling the native ptr size. Let's fix the
casting warnings described in #7788 by casting the the pointers and
values to this type first. That way we cast integers to the right size
first before turning them into pointers, and pointers are first
covnerted to integers of the right size before converting them into
integers.
Not tested, since I lack i386 EFI systems, but I think this is simple
enough to be correct event without testing.
Fixes: #7788
Double newlines (i.e. one empty lines) are great to structure code. But
let's avoid triple newlines (i.e. two empty lines), quadruple newlines,
quintuple newlines, …, that's just spurious whitespace.
It's an easy way to drop 121 lines of code, and keeps the coding style
of our sources a bit tigther.
Files which are installed as-is (any .service and other unit files, .conf
files, .policy files, etc), are left as is. My assumption is that SPDX
identifiers are not yet that well known, so it's better to retain the
extended header to avoid any doubt.
I also kept any copyright lines. We can probably remove them, but it'd nice to
obtain explicit acks from all involved authors before doing that.
We don't need to check if we are adding ourselves to the list
if we know that it's the windows or EFI shell loaders.
If we are adding the EFI default loader, additionally try to
see if we can find the systemd-boot magic string and skip
this entry if we do.
Let's make use this at various places we call fsync(), to make things
fully reliable, as the kernel devs suggest to first fsync() files and
then fsync() the directories they are located in.
This patch improves the automatic console mode switching by avoiding
changing the mode if it can verify that the text is readable in the
default mode. The implementation avoids changing mode if we're using a
low resolution device (fixed to be smaller than 1920x1080) because we
assume the text is readable, so the initial mode should be a good one.
Also, the mode is not changed when in high resolution mode if the text
viewport area is larger than 10% of the screen. The conclusion is that
only if the text viewport is calculated to occupy less than 10% of the
screen area it is assumed to be hard to read and a new mode is selected.
With this patch the auto mode will typically avoid changing mode
hopefully in most of the cases, only changing it if completely
necessary.
The new boot option allows changing the display console mode to some new
display resolution.
Usage: in systemd-boot configuration file loader/loader.conf add one of:
console-mode <number>
console-mode auto
console-mode max
console-mode keep
Where number can be:
1) 0: UEFI standard 80x25 mode
2) 1: 80x50 mode, if supported by device
3) 2 or greater: some non-standard device mode, if supported
When using the auto mode, systemd-boot will try to find a reasonable
mode automatically using some heuristic. Current implementation tries to
switch console mode to mode 2 if it exists, mode 1 if it exists, else
mode 0. Mode 2 is the first non standard mode provided by the firmware
developer and it's assumed to be a reasonable mode.
The max mode adds support for switching to the highest numbered console
mode, whatever mode that would be in the system. The maximum mode being
the last one implemented by the firmware provider should be a reasonable
mode.
The keep mode is the default and is only included for completeness. With
this parameter, the user explicitly states and can be assured that
systemd-boot will not change console mode.
Note: patch includes a workaround for mode 1, that may not exist in
EDK2 OVFM and results in a buggy text mode when requested.
Hiding automatic entries allows for giving custom entry names like
"Windows 10" instead of "Windows Boot Manager" by creating an appropriate
loader file in the loader/entries folder.
Note that it is already doable by renaming bootmgfw.efi (or the other auto-detected
boot loaders) and then using the renamed file for a custom entry. But windows will
automatically recreate the boot loader on updates, including the default EFI
bootloader entry if that one is missing.
Make hiding EFI reboot a separate option because there is no simple way to create
it with a custom loader entry and people may still want that around while still
hiding the other auto entries.
Also, turn no_editor into a positive boolean name while we're touching this code.
file_read() wants to return both a EFI_STATUS (INTN) and a file
length (UINTN). This seems rather fishy for either large files or
when returning errors (which are defined as positive numbers).
Let's just be more clear and return EFI_STATUS and let the file
length be a pointer.
currently if a stub image is directly booted, bootctl reports:
```
Current Loader:
Product: n/a
ESP: /dev/disk/by-partuuid/b0a0807d-0592-40e9-adac-3bb724e9e305
File: └─/EFI/Secure/secure-boot-4.14.8+.efi
```
Let's add a StubInfo which will be displayed by bootctl too (in a later
patch).
when an image with the stub is booted directly from UEFI, bootctl status
shows this:
```
Current Loader:
Product: n/a
ESP: /dev/disk/by-partuuid/b0a0807d-0592-40e9-adac-3bb724e9e305
File: └─n/a
```
After this change, the stub reports the image itself:
```
Current Loader:
Product: n/a
ESP: /dev/disk/by-partuuid/b0a0807d-0592-40e9-adac-3bb724e9e305
File: └─/EFI/Secure/secure-boot-4.14.8+.efi
```
log.h really should only include the bare minimum of other headers, as
it is really pulled into pretty much everything else and already in
itself one of the most basic pieces of code we have.
Let's hence drop inclusion of:
1. sd-id128.h because it's entirely unneeded in current log.h
2. errno.h, dito.
3. sys/signalfd.h which we can replace by a simple struct forward
declaration
4. process-util.h which was needed for getpid_cached() which we now hide
in a funciton log_emergency_level() instead, which nicely abstracts
the details away.
5. sys/socket.h which was needed for struct iovec, but a simple struct
forward declaration suffices for that too.
Ultimately this actually makes our source tree larger (since users of
the functionality above must now include it themselves, log.h won't do
that for them), but I think it helps to untangle our web of includes a
tiny bit.
(Background: I'd like to isolate the generic bits of src/basic/ enough
so that we can do a git submodule import into casync for it)
Followup to previous commit. Suggested by @poettering.
Reindented the `verbs[]` tables to match the apparent previous
whitespace rules (indent to one flag, allow multiple flags to overflow?).
On my system the boot and EFI partitions are protected, hence "bootctl
status" can't find the ESP, and then the tool continues with arg_path ==
NULL, which it really should not. Handle these cases, and simply
suppress all output that needs arg_path.
This renames find_esp() to find_esp_and_warn() and tries to normalize its
behaviour:
1. Change the error that is returned when we can't find the ESP to
ENOKEY (from ENOENT). This way the error code can only mean one
thing: that our search loop didn't find a good candidate.
2. Really log about all errors, except for ENOKEY and EACCES, and
document the letter cases.
3. Normalize parameters to the call: separate out the path parameter in
two: an input path and an output path. That way the memory management
is clear: we will access the input parameter only for reading, and
only write out the output parameter, using malloc() memory.
Before the calling convention were quire surprising for internal API
code, as the path parameter had to be malloc() memory and might and
might not have changed.
4. Rename bootctl's find_esp_warn() to acquire_esp(), and make it a
simple wrapper around find_esp_warn(), that basically just adds the
friendly logging for the ENOKEY case. This rework removes double
logging in a number of error cases, as we no longer log here in
anything but ENOKEY, and leave that entirely to find_esp_warn().
5. find_esp_and_warn() now takes a bool flag parameter
"unprivileged_mode", which disables logging in the EACCES case, and
skips privileged validation of the path. This makes the function less
magic, and doesn't hide this internal silencing automatism from the
caller anymore.
With all that in place "bootctl list" and "bootctl status" work properly
(or as good as they can) when I invoke the tools whithout privileges on
my system where /boot is not world-readable
Our CODING_STYLE suggests not comparing with NULL, but relying on C's
downgrade-to-bool feature for that. Fix up some code to match these
guidelines. (This is not comprehensive, the coccinelle output for this
is unfortunately kinda borked)
Setting the secure_boot flag, avoids getting the printout
"EFI stub: UEFI Secure Boot is enabled." when booting
a Linux kernel with linuxx64.efi.stub and EFI SecureBoot enabled.
This is mainly a cosmetic fixup, as the "quiet" kernel parameter does
not silence pr_efi printouts in the linux kernel (this only works using
the efi stub from the linux source tree)
The comment above makes the intent of the code pretty clear:
"use security2_protocol == NULL as indicator".
So revert the condition in the check and fix the logic in the comment while
at it.
The question is how this could have ever worked: if BS->LocateProtocol
(which is supposedly optional) ever failed, we'd crash here. Strange.
Found by coverity.
So far I avoided adding license headers to meson files, but they are pretty
big and important and should carry license headers like everything else.
I added my own copyright, even though other people modified those files too.
But this is mostly symbolic, so I hope that's OK.
There's a slight change in implementation: we first try to append the
version, then look for any non-unique pairs again. Before, we would only
mark as possibly unique those entries we changed. But if there are two
entries that e.g. have the same title and version, but only one has the
machine-id specified, we would treat one of them as still non-unique after
appending the machine-id to the other one. So the new algorithm is simpler
but more robust (not that it matters).
The advantage is that is the name is mispellt, cpp will warn us.
$ git grep -Ee "conf.set\('(HAVE|ENABLE)_" -l|xargs sed -r -i "s/conf.set\('(HAVE|ENABLE)_/conf.set10('\1_/"
$ git grep -Ee '#ifn?def (HAVE|ENABLE)' -l|xargs sed -r -i 's/#ifdef (HAVE|ENABLE)/#if \1/; s/#ifndef (HAVE|ENABLE)/#if ! \1/;'
$ git grep -Ee 'if.*defined\(HAVE' -l|xargs sed -i -r 's/defined\((HAVE_[A-Z0-9_]*)\)/\1/g'
$ git grep -Ee 'if.*defined\(ENABLE' -l|xargs sed -i -r 's/defined\((ENABLE_[A-Z0-9_]*)\)/\1/g'
+ manual changes to meson.build
squash! build-sys: use #if Y instead of #ifdef Y everywhere
v2:
- fix incorrect setting of HAVE_LIBIDN2
For files which are vital to boot
1. Avoid opening any window where power loss will zero them out or worse.
I know app developers all coded to the ext3 implementation, but
the only formal documentation we have says we're broken if we actually
rely on it. E.g.
* `man mount`, search for `auto_da_alloc`.
* http://www.linux-mtd.infradead.org/faq/ubifs.html#L_atomic_change
* https://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/
2. If we tell the kernel we're interested in writing them to disk, it will
tell us if that fails. So at minimum, this means we play our part in
notifying the user about errors.
I refactored error-handling in `udevadm-hwdb` a little. It turns out I did
exactly the same as had already been done in the `systemd-hwdb` version,
i.e. commit d702dcd.
Display the error for a small amount of time, but don't fail hard.
In case of a faulty BIOS, a TPM error should not prevent the boot.
If something cares about the PCM measurement, it will be noticed
anyway later on.
Especially important now, that TPM measurement is the default now on
some distribution builds.
https://bugzilla.redhat.com/show_bug.cgi?id=1411156
This makes it more like other configure defines.
Also, it fixes meson status output which was looking for HAVE_ and ENABLE_
prefixes only (the define under meson was OK, just the summary message was
wrong.)
In a Secure Boot scenario the stub loader will have been validated
before execution. A malicious drive could then change the data returned
in future reads, resulting in the loader obtaining incorrect section
offsets and (for instance) allowing the command line to be modified.
Pull that information out of the in-RAM representation of the loader
instead in order to avoid this.
Fixes: #6230
(Lennart did some minor coding style fixes, and renamed pefile.c → pe.c,
as suggested by Kay, given that the file now contains a function whose
name doesn't match the filename as prefix anymore.)
Adds support for booting in a SecureBoot environment with shim as a
preloader. Install an appropriate UEFI security policy to check PE
signature of a chained kernel or UEFI application (using LoadImage())
against the MOK database maintained by shim, using shim's installed
BootServices.
Implementation details for installing the security policy are based on
code from the LinuxFoundation's SecureBoot PreLoader, part of efitools
licensed under LGPL 2.1
Current signed (by Microsoft) versions of shim (Versions 0.8 & 0.9)
so not install a security policy by themselves, future Versions of
shim might (a compile time switch exists in rectent git versions),
so in the future this PR might become unnecessary.
Using conf.set() with a boolean argument does the right thing:
either #ifdef or #undef. This means that conf.set can be used unconditionally.
Previously I used '1' as the placeholder value, and that needs to be changed to
'true' for consistency (under meson 1 cannot be used in boolean context). All
checks need to be adjusted.
This small fixup removes a compiler warning when passing tcg (a const
arg type) to the uefi call wapper, which does not define it as const.
All other source files in sd-boot do this cast except measure.c, so
let's fix that.
This fixes ldsdir detection under Debian.
v2:
- define gnu_efi_arch for the arch efi include directory name
In the autotools naming convention, efi_arch and this directory always had
the same name. But meson.cpu_family() uses a slightly different convention,
so those two don't always match.
Shell scripts should be executable so that meson reports their
invocation succinctly (does not print 'sh' '-e').
Python scripts should not be executable so that meson does the
detection of the right python binary itself.
Add -u everywhere to catch potential errors.
The indentation for emacs'es meson-mode is added .dir-locals.
All files are reindented automatically, using the lasest meson-mode from git.
Indentation should now be fairly consistent.
This allow test-efi-disk.img to be created under meson.
The invocation of qemu is not converted yet, in particular because the
command-line used in Makefile.am is outdated.
This doesn't feel as natural, but is more consistent with the boolean options
which require true/false, and allows setting of options without knowing of
which type the option is.
This is a very straightforward conversion of the rules in Makefile.am.
Generated objects (on arm64) are identical.
The only difference in executed commands is that automake uses ld -m
elf_x86_64, without us specifying the -m option anywhere. I suspect that
using the default for the given linker should be OK, so it's fine to just
skip it.
When using pkg-config to determine the include flags for blkid the
flags are returned as:
$ pkg-config blkid --cflags
-I/usr/include/blkid -I/usr/include/uuid
We use the <blkid/blkid.h> include which would be correct when using
the default compiler /usr/include header search path. However, when
cross-compiling the blkid.h will not be installed at /usr/include and
highly likely in a temporary system root. It is futher compounded if
the cross-compile packages are split up and the blkid package is not
available in the same sysroot as the compiler.
Regardless of the compilation setup, the correct include path should be
<blkid.h> if using the pkg-config returned CFLAGS.
We defined both $(VERSION) and $(PACKAGE_VERSION) with the same contents.
$(PACKAGE_VERSION) is slightly more descriptive, so settle on that, and
drop the other define.
With some UEFI shells LoadOptionsSize is reported being > 0
but the corresponding LoadOptions does not contain any data
(the first element has value 0).
When that happens, the stub feature that allows .cmdline to be
replaced by what's in LoadOptions ends up copying nothing/random
data to the kernel cmdline resulting in different kinds of boot
problems.
To fix this, add a check to see if LoadOptions contains data
before replacing the .cmdline.
Signed-off-by: Mikko Ylinen <mikko.ylinen@linux.intel.com>
If the snippet aleady exists, don't do anything, as the file was already
installed then.
(This also reworks the code to create the file atomically)
Fixes: #5396
According to TCG EFI Protocol Specification for TPM 2.0 family,
all events generated after the invocation of EFI_TCG2_GET_EVENT_LOG
shall be stored in an instance of an EFI_CONFIGURATION_TABLE aka
EFI TCG 2.0 final events table. Hence, it is necessary to trigger the
internal switch through calling get_event_log() in order to allow
to retrieve the logs from OS runtime.
msekletar:
> I've looked at EDK2 and indeed log entry is added to FinalEventsTable only after
> EFI_TCG2_PROTOCOL.GetEventLog was called[1][2]. Also, same patch was currently
> merged to shim by Peter Jones [3].
[1] https://github.com/tianocore/edk2/blob/master/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c#L698
[2] https://github.com/tianocore/edk2/blob/master/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c#L824
[3] rhinstaller/shim#64
'continue' is a fancy no-op here – it only skips through the inner loop,
not the outer one, so entries already in BootOrder get printed twice.
This partially reverts f939cff715 "bootctl: various coding style
updates".
We already have tolower() calls there, hence let's unify this at one place.
Also, update the code to only use ASCII operations, so that we don't end up
being locale dependant.
This rearranges bootctl a bit, so that it uses the usual verbs parsing
routines, and automatically searches the ESP in /boot, /efi or /boot/efi, thus
increasing compatibility with mainstream distros that insist on /boot/efi.
This also adds minimal support for running bootctl in a container environment:
when run inside a container verification of the ESP via raw block device
access, trusting the container manager to mount the ESP correctly. Moreover,
EFI variables are not accessed when running in the container.
If the ESP is not mounted with "iocharset=ascii", but with "iocharset=utf8"
(which is for example the default in Debian), the file system becomes case
sensitive. This means that a file created as "FooBarBaz" cannot be accessed as
"foobarbaz" since those are then considered different files.
Moreover, a file created as "FooBar" can then also not be accessed as "foobar",
and it also prevents such a file from being created, as both would use the same
8.3 short name "FOOBAR".
Even though the UEFI specification [0] does give the canonical spelling for
the files mentioned above, not all implementations completely conform to that,
so it's possible that those files would already exist, but with a different
spelling, causing subtle bugs when scanning or modifying the ESP.
While the proper fix would of course be that everybody conformed to the
standard, we can work around this problem by just referencing the files by
their 8.3 short names, i.e. using upper case.
Fixes: #3740
[0] <http://www.uefi.org/specifications>, version 2.6, section 3.5.1.1
WaitForKeyEx may never return on some UEFI systems depending
on firmware, hardware configuration and the phase of the moon.
Use ConIn->WaitForKey unconditionally instead.
Fixes#3632
That function doesn't draw anything on it's own, just returns a string, which
sometimes is more than one character. Also remove "DRAW_" prefix from character
names, TREE_* and ARROW and BLACK_CIRCLE are unambigous on their own, don't
draw anything, and are always used as an argument to special_glyph().
Rename "DASH" to "MDASH", as there's more than one type of dash.
The UEFI BIOS already hashes the contents of the loaded image, so the
initrd and the command line of the binary are recorded.
Because manually added LoadOptions are not taken into account, these
should be recorded also.
This patch logs and extends a TPM PCR register with the LoadOptions.
This feature can be enabled with configure --enable-tpm
The PCR register index can be specified with
configure --with-tpm-pcrindex=<NUM>
There are more than enough calls doing string manipulations to deserve
its own files, hence do something about it.
This patch also sorts the #include blocks of all files that needed to be
updated, according to the sorting suggestions from CODING_STYLE. Since
pretty much every file needs our string manipulation functions this
effectively means that most files have sorted #include blocks now.
Also touches a few unrelated include files.
This also allows us to drop build.h from a ton of files, hence do so.
Since we touched the #includes of those files, let's order them properly
according to CODING_STYLE.
Some places invoked fflush() directly with their own manual error
checking, let's unify all that by using fflush_and_check().
This also unifies the general error paths of fflush()+rename() file
writers.
If Linux efi stub is used, embedded cmdline in efi stub is
not shown. As a result, it is required to rewrite all the
line, if is only required to modify it. This behavior only
happen using Linux efi stub.
This patch allows boot loader to show embedded cmdline when
'e' key is pressed to edit boot loader options.
If /etc/machine-id is missing (eg., gold images), we should not fail
installing sd-boot. This is a perfectly fine use-case and we should simply
skip installing the default loader config in that case.
According to os-release(5), VERSION_ID is not mandatory and BUILD_ID only
needs to be unique underneath VERSION_ID. Therefore, assuming a missing
VERSION_ID field means 'empty', we can rely on BUILD_ID to be unique.
Use BUILD_ID if VERSION_ID is not present. This way, rolling-release
distros can still provide a proper os-release entry without crafting
random VERSION_ID strings.
This fixes#186.
There is no guarantee that the os-release section contains each key only
once, nor any guarantee that all keys are present. Make sure we properly
free memory in both cases.
Not that it matters much, as we're short-living, anyway. But correct code
is always nicer to read..
sdboot was renamed to systemd-boot
Fixes: e7dd673d1e ("gummiboot/sd-boot/systemd-boot: rename galore")
Signed-off-by: Miguel Bernal Marin <miguel.bernal.marin@linux.intel.com>
Use strjoina to avoid error handling, and openat to simplify things.
Some fixes on the way:
- ferror does not set errno, so the return value was wrong in some cases
- errors are propagated in more cases
- EFI/systemd was created, but EFI/systemd-boot was deleted
- something is always printed on error
- when checking the version, comparison was done against "systemd-bo" for some reason
- return value was converted from negative to EXIT_SUCCESS/EXIT_FAILURE twice,
resulting in EXIT_SUCCESS all the time
This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
What used to be gummiboot, was renamed sd-boot when it was merged into
systemd. Let's try to be a bit more consistent with the rest of systemd
and rename it again as follows:
The EFI bootloader is now called 'systemd-bootx64.efi', and its sources are in
'src/boot/efi/'. The drop-in directory where bootctl will find EFI loaders
is now /usr/lib/systemd/boot/efi/.
getopt is usually good at printing out a nice error message when
commandline options are invalid. It distinguishes between an unknown
option and a known option with a missing arg. It is better to let it
do its job and not use opterr=0 unless we actually want to suppress
messages. So remove opterr=0 in the few places where it wasn't really
useful.
When an error in options is encountered, we should not print a lengthy
help() and overwhelm the user, when we know precisely what is wrong
with the commandline. In addition, since help() prints to stdout, it
should not be used except when requested with -h or --help.
Also, simplify things here and there.
If -flto is used then gcc will generate a lot more warnings than before,
among them a number of use-without-initialization warnings. Most of them
without are false positives, but let's make them go away, because it
doesn't really matter.
In trying to track down a stupid linker bug, I noticed a bunch of
memset() calls that should be using memzero() to make it more "obvious"
that the options are correct (i.e. 0 is not the length, but the data to
set). So fix up all current calls to memset(foo, 0, length) to
memzero(foo, length).
Prefer firmware-provided performance data over loader-exported ones; if
ACPI data is available, always use it, otherwise try to read the loader
data.
The firmware-provided variables start at the time the first EFI image
is executed and end when the operating system exits the boot services;
the (loader) time calculated in systemd-analyze increases.
