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Kernel/Graphics + SystemServer: Support text mode properly

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As we removed the support of VBE modesetting that was done by GRUB early
on boot, we need to determine if we can modeset the resolution with our
drivers, and if not, we should enable text mode and ensure that
SystemServer knows about it too.

Also, SystemServer should first check if there's a framebuffer device
node, which is an indication that text mode was not even if it was
requested. Then, if it doesn't find it, it should check what boot_mode
argument the user specified (in case it's self-test). This way if we
try to use bochs-display device (which is not VGA compatible) and
request a text mode, it will not honor the request and will continue
with graphical mode.

Also try to print critical messages with mininum memory allocations
possible.

In LibVT, We make the implementation flexible for kernel-specific
methods that are implemented in ConsoleImpl class.
This commit is contained in:
Liav A 2021-04-16 22:58:51 +03:00 • committed by Andreas Kling
parent dac129e10b
commit 20743e8aed
41 changed files with 1832 additions and 321 deletions
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Meta/CMake/all_the_debug_macros.cmake
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@ -16,6 +16,7 @@ set(BXVGA_DEBUG ON)
set(PS2MOUSE_DEBUG ON)
set(MOUSE_DEBUG ON)
set(VMWARE_BACKDOOR_DEBUG ON)
set(VIRTUAL_CONSOLE_DEBUG ON)
set(FILEDESCRIPTION_DEBUG ON)
set(PROCFS_DEBUG ON)
set(VFS_DEBUG ON)