Kernel: Separate framebuffers from bootmode

Bootmode used to control framebuffers, panic behavior, and SystemServer.
This patch factors framebuffer control into a separate flag.
Note that the combination 'bootmode=self-test fbdev=on' leads to
unexpected behavior, which can only be fixed in a later commit.

Meta/Azure/Serenity.yml

@@ -80,7 +80,7 @@ jobs:
       timeoutInMinutes: 60
       env:
         SERENITY_QEMU_CPU: 'max,vmx=off'
-        SERENITY_KERNEL_CMDLINE: 'boot_mode=self-test'
+        SERENITY_KERNEL_CMDLINE: 'fbdev=off boot_mode=self-test'
         SERENITY_RUN: 'ci'
 
     - script: |

Meta/extlinux.conf

@@ -13,7 +13,7 @@ LABEL SerenityOS
 LABEL SerenityOSText
     MENU LABEL SerenityOS (text mode)
     KERNEL mboot.c32
-    APPEND ../Prekernel root=/dev/hda1 boot_mode=text --- ../Kernel
+    APPEND ../Prekernel root=/dev/hda1 fbdev=off --- ../Kernel
 
 LABEL SerenityOSNoACPI
     MENU LABEL SerenityOS (No ACPI)

Meta/grub-ebr.cfg

@@ -8,7 +8,7 @@ menuentry 'SerenityOS (normal)' {
 
 menuentry 'SerenityOS (text mode)' {
   root=hd0,5
-  multiboot /boot/Prekernel boot_mode=no-fbdev root=/dev/hda4
+  multiboot /boot/Prekernel fbdev=off root=/dev/hda4
   module /boot/Kernel
 }
 

Meta/grub-gpt.cfg

@@ -8,7 +8,7 @@ menuentry 'SerenityOS (normal)' {
 
 menuentry 'SerenityOS (text mode)' {
   root=hd0,2
-  multiboot /boot/Prekernel boot_mode=no-fbdev root=/dev/hda2
+  multiboot /boot/Prekernel fbdev=off root=/dev/hda2
   module /boot/Kernel
 }
 

Meta/grub-mbr.cfg

@@ -8,7 +8,7 @@ menuentry 'SerenityOS (normal)' {
 
 menuentry 'SerenityOS (text mode)' {
   root=hd0,1
-  multiboot /boot/Prekernel boot_mode=no-fbdev root=/dev/hda1
+  multiboot /boot/Prekernel fbdev=off root=/dev/hda1
   module /boot/Kernel
 }
 

Meta/run.sh

@@ -69,6 +69,7 @@ fi
 
 [ "$KVM_SUPPORT" -eq "1" ] && SERENITY_VIRT_TECH_ARG="-enable-kvm"
 
+# For default values, see Kernel/CommandLine.cpp
 [ -z "$SERENITY_KERNEL_CMDLINE" ] && SERENITY_KERNEL_CMDLINE="hello"
 
 [ -z "$SERENITY_RAM_SIZE" ] && SERENITY_RAM_SIZE=1G

Meta/serenity.sh

@@ -358,7 +358,7 @@ if [[ "$CMD" =~ ^(build|install|image|copy-src|run|gdb|test|rebuild|recreate|kad
             else
                 build_target install
                 build_target image
-                export SERENITY_KERNEL_CMDLINE="boot_mode=self-test"
+                export SERENITY_KERNEL_CMDLINE="fbdev=off boot_mode=self-test"
                 export SERENITY_RUN="ci"
                 build_target run
             fi