beenull/ladybird
1
0
Fork 0
mirror of https://github.com/LadybirdBrowser/ladybird.git synced 2024-11-21 23:20:20 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 6

Documentation: Remove another redundant chapter

Browse source 
Clearly nobody has used this in a while because cpuinfo.c
for GCC 11 does not contain the code that's mentioned here.
This commit is contained in:
Gunnar Beutner 2021-07-10 14:03:49 +02:00
parent d23d81d075
commit 2c392669c6
Notes: sideshowbarker 2024-07-18 09:22:40 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/2c392669c6a
Pull-request: https://github.com/SerenityOS/serenity/pull/8594
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/awesomekling ✅
Reviewed-by: https://github.com/nico
1 changed files with 0 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
Documentation/BuildInstructionsWindows.md
View file

@ -58,23 +58,6 @@ To run SerenityOS in a WHPX-enabled QEMU VM:
### Known issues with WHPX
#### Illegal instruction on boot
Using `SERENITY_QEMU_CPU="max"` can trigger a QEMU bug where the OSXSAVE CPUID flag is erroneously set, playing havoc
with feature detection logic in libgcc and resulting in this error.
To workaround this, first adjust the `SERENITY_QEMU_CPU` setting to emulate a more restricted feature set. `SERENITY_QEMU_CPU="qemu32"`
appears to work in some cases, however in others causes the boot freeze issue above. It's worth playing around with
various different values here to see if you can find one that works for you. Running `qemu-system-x86_64.exe -cpu ?` will
list the supported CPU configurations.
If you cannot find a working CPU feature set, the next workaround is to patch libgcc in the Serenity toolchain build to
remove the offending instruction.
Comment out the `if ((ecx & bit_OSXSAVE))` block in `Toolchain/Tarballs/gcc-<version>/libgcc/config/i386/cpuinfo.c`. In
GCC 10.2.0 this is lines 282-297.
Rebuild the toolchain using `Toolchain/BuildIt.sh` as normal, then rebuild Serenity.
#### Slow boot on HiDPI systems
On some Windows systems running with >100% scaling, the booting phase of Serenity might slow to a crawl. Changing the