Commit Graph

275 Commits

Author SHA1 Message Date
Adrien Destugues
cda13c638d ARM: add support for Allwinner A10 interrupt controller
Untested so far.

Change-Id: I3453115599cf2112858a194173212401ae4ac1b7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5104
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Reviewed-by: David Karoly <karolyd577@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
2022-04-25 20:50:04 +00:00
David Karoly
d232643ed8 boot/efi/arm: add debug logs for initial CPU state
Change-Id: I08df563ef6967f5f9734bbe11ac643c3b68f504f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5151
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2022-03-29 07:09:14 +00:00
David Karoly
9d65dbf1cb boot/efi: rework address-cells and size-cells handling
see Devicetree Specification,
section 2.3.5 #address-cells and #size-cells

The #address-cells and #size-cells properties may be used in any
device node that has children in the devicetree hierarchy and
describes how child device nodes should be addressed.

The #address-cells and #size-cells properties are not inherited from
ancestors in the devicetree. They shall be explicitly defined.

If missing, a client program should assume a default value of 2
for #address-cells, and a value of 1 for #size-cells.

Change-Id: Iafed49358540f8ac7aa673c3dc0191c9b580250b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5144
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2022-03-24 13:24:22 +00:00
David Karoly
fdb459132e boot/efi/x86: implement SMP detection and bootup
* move common SMP initialization code to x86/arch_smp.cpp

* factor out arch-specific SMP initialization to
  arch_smp_32.cpp resp arch_smp_64.cpp

* implement smp_trampoline for x86 32-bit EFI loader

* rename SMP trampoline for x86_64 to long_smp_trampoline

* add new argument virtKernelArgs to arch_smp_boot_other_cpus
  as the kernel args are not identity mapped on 32-bit architectures

Change-Id: I30d0bb1fa9bfb08f6784a2af34eb83d6b64afa57
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4869
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
2022-03-01 17:39:19 +00:00
David Karoly
acb424c8b7 boot/arm: move system_time and spin to platform
Add fake implementation for system_time()
Implement spin() using EFI boot services

Change-Id: Ib69b851780bd03624ce4e19d725dd319f6640601
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4964
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
2022-02-19 15:35:21 +00:00
David Karoly
367beefadc boot/x86: move HPET initialization to arch folder
Change-Id: Iac3f4923f132c4c3328fde5af1dad75af5b2efbd
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4864
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2022-01-28 10:25:29 +00:00
David Karoly
023a36024d boot/efi: introduce arch_dtb
Change-Id: Iff9e4198aca706097889faf51e9559fe551126ad
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4782
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2022-01-05 16:22:35 +00:00
David Karoly
6117e0c29c boot/loader: relocate kernel to virtual address space on 32-bit architectures
Change-Id: Ic86ca6874f358df8755a0c691cccb155d145e06c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4675
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
2022-01-01 11:35:28 +00:00
David Karoly
af90bfd3bb boot/efi: introduce arch_convert_kernel_args
Change-Id: Iabb321564d6733c6cf481ec2548fa287e308ae89
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4796
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2021-12-17 08:58:57 +00:00
X512
8ca0f03d0c riscv64/smp: Implement multi-processor support
* Working under qemu smp 1,2+
* Working on SiFive Unmatched
* x86_64 efi not broken by smp_boot_other_cpus change

Change-Id: I32ebc17913e46ed082be9ade8f56448bbf12f16e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4705
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2021-12-12 15:35:24 +00:00
David Karoly
354655e136 boot/efi/dtb: implement interrupt controller detection
Change-Id: I045a94c5bcb7c16297bc6fdd1fa2981e5b3f3a62
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4756
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2021-12-07 10:58:24 +00:00
Alexander von Gluck IV
4b5c7fe7e1 system/boot: add optional alignment to kernel_args_malloc
* A few things need alignment, instead of forcing them all
  to align themselves, support alignment of the kernel_args
* Default of 1 is "no alignment"

Change-Id: Iff05dcec8adaa963c8444d701464ea11616062f6
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4698
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2021-11-07 09:58:15 +00:00
Augustin Cavalier
e8ab10abd6 Fix return type of video_text_console_init. 2021-10-22 15:10:53 -04:00
Augustin Cavalier
5e43707307 bootloader: Refactor console functions into the VFS ConsoleNode class.
This way it becomes much easier to write multiple console implementations
in one bootloader.

Tested for bios_ia32 and efi.

Change-Id: I67134f5c3de109b15d46898864ba7f51c6592afc
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4642
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2021-10-22 19:02:06 +00:00
Augustin Cavalier
0d66d8d486 boot_loader: Add a video_text_console for potential use by bootloaders.
This uses the frame buffer console that KDL uses. It needs some work,
though, as the frame_buffer_console colors system is not quite compatible.
2021-10-22 10:43:27 -04:00
Augustin Cavalier
80519e78aa bootloader: Clarify comment in text_console.h.
The following colors are "foreground colors only" not "foreground colors,
only if".
2021-09-17 15:36:57 -04:00
Augustin Cavalier
aa04f48dcf Remove some unused headers. 2021-09-17 15:29:00 -04:00
Fredrik Holmqvist
5185ccdeb4 efi/arch_smp.h: use __aarch64__ for ARM64 defines 2021-08-23 21:28:15 +02:00
Fredrik Holmqvist
01dad9378b Add ARM64 arch_cpu.h header 2021-08-23 21:10:34 +02:00
Alexander von Gluck IV
a03687553b platform/efi: platform_cpu_info
* This models the CpuInfo into a cross-architecture
  platform_cpu_info
* Originally I was looking at merging this with "arch_cpu_info"
  however that is "overall cpu" while CpuInfo is "indivial core
  information" packed into an array.
* Since every dtb platform will report individual cores in fdt,
  having a common cpu core info struct with at minimum the core
  id makes sense.
* This could likely be refined further to some kind of core info
  packed inside of arch_cpu_info, but this will fix arm,arm64,etc
  for now until someone wants to dive into that.

Change-Id: Ia18a352403cd0da7130c1e637fc205d4311478ef
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4363
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
2021-08-20 13:38:17 +00:00
Alexander von Gluck IV
d637e0bec1 system/kernel: Rework uart management
Change-Id: I6cb31760519c8ba4542d217d6e68439602eda558
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4356
Reviewed-by: Jessica Hamilton <jessica.l.hamilton@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2021-08-20 03:03:25 +00:00
X512
d031c09ceb kernel/arch/cpu: implement for riscv64
Change-Id: Ib4dd636f9ebb62931f77c809185ea810485d801e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4057
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2021-08-06 15:41:33 +00:00
Jessica Hamilton
d3beb376b5 boot splash: offset icons when no logo is present
* Makes the case where the loader and the install differ by
  release type, so that the icons are rendered in the same
  position

Change-Id: I01e48109ce127b202ce5e05544aa2d5a495ed53e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4162
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2021-07-07 13:01:36 +00:00
Jessica Hamilton
62f80a2a71 loader: fetch all potential boot partitions for device
This also keeps the functionality of hrev53848, which simplifies the
list of disks searched for bootable partitions; however, it maintains
the previous behaviour of platform_get_boot_partitions that continues
to iterate over a list of possible boot partitions, which should
allow finding a bootable BFS partition better in more circumstances.

Particularly, there are numerous reports of the UEFI loader entering
the boot menu despite it finding a bootable partition, which this
should address.

EFI's device_contains_partition is also structured such that it
compares the disk GPT table of the partition the loader is
querying of the EFI disk's GPT table, in the case that there are
multiple disks, as the most reliable method of comparison, with
a generic fallback for non-GPT disks, which will be less reliable.

This reverts commit 0d932a49ad.

Change-Id: I5fac8608035d56b8bb4dc6c3d495ec6db42fa9b7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4149
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2021-07-04 23:31:18 +00:00
Murai Takashi
560961ee2a Bootloader: replace blacklist with blocklist
Various projects, both commercial and OSS, began to use inclusive
terminology. There is no reason to not do it.

In Haiku, bootloader uses Blacklist, which is recommended to replace
with Denylist or Blocklist. I think Blocklist is appropriate here,
since it's a list used to block offending driver at boot.

Some strings remain unchanged for compatibility with previous naming,
but this change prepares for later removal of these (once everyone has
updated their kernel and bootloader).

Change-Id: Id9105ff5e9fcb866000355089b5ef97bf63ee854
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3145
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2021-03-27 10:47:33 +00:00
Adrien Destugues
f1d4377609 Build fix. 2021-01-26 20:05:05 +01:00
PulkoMandy
19024bc416 openfirmware: synchronize number of memory range with bios and efi
It was bumped for bios and efi from previously very low values, but
other architectures did not follow.

Change-Id: I6ce92e2cdb0261d4d0637753e77d555d407073fc
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3575
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2020-12-31 02:58:10 +00:00
Alexander von Gluck IV
0558674126 efi: fix pointer width on non-64-bit platforms
Change-Id: I041238af87df3e1e3a967216685413801fd49877
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2450
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Fredrik Holmqvist <fredrik.holmqvist@gmail.com>
2020-09-17 13:58:55 +00:00
Alexander von Gluck IV
21258e2674 riscv64: Fill in some missing CPU defines, advance build further
Change-Id: Id050fad59ede444f2eab7eca681c6ec44612aaf9
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3160
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: François Revol <revol@free.fr>
2020-08-19 16:11:32 +00:00
Alexander von Gluck IV
89fd39f42a efi: Refactor CPU code to be arch-specific
* Migrate some platform agnostic architecture code into
  boot/arch from efi/arch. This helps to avoid conflicts
  between kernel and boot sources as well.
* Conflicts between arch_cpu in efi and kernel code means
  bootcode really should *never* directly use kernel arch
  headers. (other platforms don't, which is why they don't
  have this same issue)
* We carefully thread any needed kernel headers (namely
  assembly helper macros) into the bootloader headers without
  mixing in the whole conflicting kernel/arch headers.
* ARM now properly get its cpu init code called, and we
  progress further into the EFI bootloader.

Change-Id: If67ec9758b5ce68563ebd9eb45d5196401911c67
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2975
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2020-07-04 21:04:20 +00:00
Michael Lotz
d750211a65 bootloader: Split memory map handling into add/remove passes.
The memory map may be unordered and include overlapping ranges. To make
sure that nothing gets included as usable that should actually be
excluded, first scan for all usable ranges and add them, then remove
anything unusable from these ranges again.

To calculate the amount of unusable memory, count the total after the
first pass and then subtract the total after the second. This way, only
unusable ranges that actually overlap physical memory (and therefore
reduce the amount of usable memory) get excluded.

Note that the explicit ignore of the ACPI reclaim memory is subsumed by
the above. We still don't want to add this region to the usable memory
map, as that would allow the kernel to allocate pages into that region,
possibly corrupting ACPI tables before they were used. We also don't
want to add it as an allocated range, as it is not guaranteed that ACPI
is done with the tables before the unused bootloader ranges are freed in
the kernel.

Also add the missing unusable memory amount from ignoring the first MiB
of memory in the EFI loader.

May fix #16056 although it is not certain that graphics memory ranges
are actually included in the memory map.

Change-Id: Ie7991d2c4dcd988edac2995b3a7efc509fa0f4a3
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2814
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2020-05-26 04:04:35 +00:00
Jérôme Duval
11f8b65a79 boot_loader: load intel microcode update data file
Previous version of the patch was broken by the EFI refactoring.

Change-Id: I6dd125100b22b2461c531bfd8f81b3dd28e2b751
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2409
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>
2020-03-23 15:33:34 +00:00
waddlesplash
6f857fa9fb Revert "boot_loader: load intel microcode update data file"
This reverts commit a732059324.

It broke the build on most boot platforms (including EFI.)
2020-03-23 10:09:21 -04:00
Jérôme Duval
a732059324 boot_loader: load intel microcode update data file
Change-Id: I323a57cc0b1f05ad7b60b6a141d068a3e618ee4d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2263
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2020-03-23 06:16:28 +00:00
Jérôme Duval
56bb1bd5c9 kernel: load cpu microcode update if loaded by the bootloader
add optional fields for microcode in kernel_args.

Change-Id: Ic5fb54cf6c9f489a2d1cdda00f63980c11dcdaeb
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2264
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2020-03-16 06:41:16 +00:00
Alexander von Gluck IV
71680f7b7d efi: Cleanup arch_mmu, drop extra arch_timer.h
Change-Id: I0d6d2f8db2bc86c08d5ba2648f1cf46d85b54a5e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2267
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2020-02-22 22:15:08 +00:00
Alexander von Gluck IV
d2986cb6d0 system/boot: More cleanup and shuffling
* arm efi additions
* cleanup some cpu headers which were oddly
  split between efi and bios_ia32
* Move calculate_cpu_conversion_factor over to
  arch_timer since it is timerish, and x86 only
* Drop some duplicated code from efi start. Move
  hpet init code into efi timer/hpet code

Change-Id: Ia4264a5690ba8c09417b06788febc4f572f111ce
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2259
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2020-02-22 14:37:45 +00:00
Alexander von Gluck IV
04f1baa771 EFI: Make our haiku_loader architecture agnostic
* This is the bulk of the work. Anything else should be
  minor cleanups and tweaking.
* riscv64 isn't a viable EFI platform yet.. just acting
  as a stand-in to test a non-x86 EFI haiku_loader

Change-Id: Ib03de81e2b562e693987b86d7b4318209fb1c792
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2256
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2020-02-21 14:29:22 +00:00
Fredrik Holmqvist
0d932a49ad Revert "loader: fetch all potential boot partitions for boot device."
This reverts commit e888217124.

Change-Id: I06be82ac863f615796d9edc86f5ef903b8123a9d
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2231
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2020-02-08 17:38:38 +00:00
Andrej Antunovikj
7b4d924f98 cpu: Extract shared x86 code from efi & bios_ia32
This issue was initially detected by PVS Studio (issue number V547) and fixed
as part of Google Code-in 2019.

The initial problem was the calculate_cpu_conversion_factor function
which had been copied in the BIOS and EFI versions of the boot code.
Further investigation led to more duplicated or very similar functions
being identified.

Introduce an arch_cpu.h for the x86 boot platform to group these things
in a single place, and adjust the BIOS and EFI code to call into that.
Note that the BIOS and EFI code is still a little platform specific,
ideally there should be a boot_arch_cpu_init() function for each
architecture as already done for openfirmware and u-boot.

Also remove some irrelevant comments from copypasted files for other
architectures, as that was filling my git grep with useless noise.

Change-Id: I16d815f0bf015cec0b4e03cc14f3cc447c7164c5
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1985
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2020-01-25 11:56:46 +00:00
Augustin Cavalier
d2f7af0edc Revert "deprecate gets and tmpnam"
This reverts commit 92e9211d7b.

It broke the build, and apparently cannot be fixed until GCC
has been patched.
2020-01-04 15:26:08 -05:00
Adrien Destugues
92e9211d7b deprecate gets and tmpnam
For #15515

As mentionned in the ticket, we may also want to hide the symbols
altogether from libroot for newer API/ABI versions, unless we still want
to provide C89/C99/C++98/C++11 compatibility, in which case we still
need them around.

Change-Id: I0ee267fb6c4c2f4bae9b1ba6f68e2bcefc399a7f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2061
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2020-01-03 03:35:04 +00:00
Alexander von Gluck IV
b482adb1bc kernel/boot/efi: Continue breaking apart arch-specific code; hpet
* Move x86 hpet behind timer interface.
  * Add a few if x86,x86_64 macros to start.cpp.

Change-Id: I583ec1b064785182e6d48dfbcd91b1bb2ead4b44
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1929
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
2019-11-26 21:34:43 +00:00
Alexander von Gluck IV
7c32619c7f boot/platform: Break x86 code away from core EFI code
Change-Id: I88afad6d071e8b577c23da9c60392c60b3726514
Reviewed-on: https://review.haiku-os.org/c/haiku/+/1895
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
2019-10-03 14:05:49 +00:00
PulkoMandy
d5cd4a9d51 openfirmware: adjust for 64bit
Sparcv9 runs Openboot in 64 bit mode, which means the cell size is
64bit. Use intptr_t where appropriate to make the open firmware calls
work.

Beware, some values are still 32bit, this matters for example for
of_getprop, if you get 32bits into a 64bit variables it will be in the
MSB of it (big endian only weakness...) and confuse things. See for
example in console.cpp, where the input and output handles are retrieved
as 32bit values. It seems wise to check the expected size when using
of_getprop in these cases, instead of just checking for errors.

Change-Id: Ie72ebc4afe7c6d7602a47478f0bfb6b8247004b8
Reviewed-on: https://review.haiku-os.org/c/1369
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2019-08-10 17:59:04 +00:00
PulkoMandy
e8f58ba4be sparc: fix bootloader build
- Add various missing jamfiles
- Add required implementation stubs
- Update openfirmware jamfiles for multiboot support
- Update linker rules for sparc loader

Change-Id: I2d06c7a4d33827f58d82946687003f9a0dcb1b7d
Reviewed-on: https://review.haiku-os.org/c/1329
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2019-04-04 20:31:25 +00:00
Augustin Cavalier
fcf0b31fb9 bootloader: Add the network endianness macros to NetDefs.h.
This file contains all the protocol- and interface-related
definitions, so this seems to be where they belong.

Required following previous commits.
2019-03-26 21:51:42 -04:00
Andreas Faerber
e1b41d44a3 boot loader: Wire up net_stack_cleanup()
Add a platform cleanup hook before starting the kernel. The openfirmware
and PXE loaders clean up their network stack there, while the other
loaders currently do nothing.

This closes ticket #6166

Change-Id: I34765892dfd9b2310c6af97c9ff7d414afae49e5
Reviewed-on: https://review.haiku-os.org/c/50
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
2019-03-26 20:25:19 +00:00
Augustin Cavalier
f2015c2f81 boot/platform/cfe: Remove, unused.
All platforms it was theoretically useful for also have U-Boot.
OK'd by mmu_man.
2018-08-11 20:21:12 -04:00
Fredrik Holmqvist
04cbc2588e Use fast clearing of visible screen for splash
memset uses rep stosb on x86 during boot, with memory
not set to write-combining, which makes it slow.

Instead we do aligned writes of 2 x four bytes at once.
Only clear the minimum of size and width * height * 4
UEFI framebuffer size can be huge, upto 512MB here,
and rep stosb seems to be around 25-30MB/s

This is written as generic as possible to work on
old compilers and different platforms, without
expecting boot memset to be optimized.

This makes it almost unnoticable compared to not
clearing.
2018-08-03 13:40:04 +02:00