Kernel: Introduce basic pre-kernel environment

This implements a simple bootloader that is capable of loading ELF64
kernel images. It does this by using QEMU/GRUB to load the kernel image
from disk and pass it to our bootloader as a Multiboot module.

The bootloader then parses the ELF image and sets it up appropriately.
The kernel's entry point is a C++ function with architecture-native
code.

Co-authored-by: Liav A <liavalb@gmail.com>

5 files changed, 50 insertions, 22 deletions

diff --git a/Meta/debug-kernel.sh b/Meta/debug-kernel.sh
index 15c255c356..c33c3da4a0 100755
--- a/Meta/debug-kernel.sh
+++ b/Meta/debug-kernel.sh
@@ -10,14 +10,12 @@
 #
 if [ "$SERENITY_ARCH" = "x86_64" ]; then
     gdb_arch=i386:x86-64
-    kernel_binary=Kernel64
 else
     gdb_arch=i386:intel
-    kernel_binary=Kernel
 fi
 
 exec $SERENITY_KERNEL_DEBUGGER \
-    -ex "file $(dirname "$0")/../Build/${SERENITY_ARCH:-i686}/Kernel/$kernel_binary" \
+    -ex "file $(dirname "$0")/../Build/${SERENITY_ARCH:-i686}/Kernel/Kernel" \
     -ex "set arch $gdb_arch" \
     -ex 'target remote localhost:1234' \
     -ex "source $(dirname "$0")/serenity_gdb.py" \
diff --git a/Meta/grub-ebr.cfg b/Meta/grub-ebr.cfg
index 4c1a49174f..d0b555ad0b 100644
--- a/Meta/grub-ebr.cfg
+++ b/Meta/grub-ebr.cfg
@@ -2,21 +2,25 @@ timeout=1
 
 menuentry 'SerenityOS (normal)' {
   root=hd0,5
-  multiboot /boot/Kernel root=/dev/hda4
+  multiboot /boot/Bootloader root=/dev/hda4
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (text mode)' {
   root=hd0,5
-  multiboot /boot/Kernel boot_mode=no-fbdev root=/dev/hda4
+  multiboot /boot/Bootloader boot_mode=no-fbdev root=/dev/hda4
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (No ACPI)' {
   root=hd0,5
-  multiboot /boot/Kernel root=/dev/hda4 acpi=off
+  multiboot /boot/Bootloader root=/dev/hda4 acpi=off
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (with serial debug)' {
-	root=hd0,5
-  multiboot /boot/Kernel serial_debug root=/dev/hda4
+  root=hd0,5
+  multiboot /boot/Bootloader serial_debug root=/dev/hda4
+  module /boot/Kernel
 }
 
diff --git a/Meta/grub-gpt.cfg b/Meta/grub-gpt.cfg
index 5314518a69..72f16b805c 100644
--- a/Meta/grub-gpt.cfg
+++ b/Meta/grub-gpt.cfg
@@ -2,20 +2,24 @@ timeout=1
 
 menuentry 'SerenityOS (normal)' {
   root=hd0,2
-  multiboot /boot/Kernel root=/dev/hda2
+  multiboot /boot/Bootloader root=/dev/hda2
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (text mode)' {
   root=hd0,2
-  multiboot /boot/Kernel boot_mode=no-fbdev root=/dev/hda2
+  multiboot /boot/Bootloader boot_mode=no-fbdev root=/dev/hda2
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (No ACPI)' {
   root=hd0,2
-  multiboot /boot/Kernel root=/dev/hda2 acpi=off
+  multiboot /boot/Bootloader root=/dev/hda2 acpi=off
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (with serial debug)' {
-	root=hd0,2
-  multiboot /boot/Kernel serial_debug root=/dev/hda2
+  root=hd0,2
+  multiboot /boot/Bootloader serial_debug root=/dev/hda2
+  module /boot/Kernel
 }
diff --git a/Meta/grub-mbr.cfg b/Meta/grub-mbr.cfg
index 150bce4f49..34e727430b 100644
--- a/Meta/grub-mbr.cfg
+++ b/Meta/grub-mbr.cfg
@@ -2,20 +2,24 @@ timeout=1
 
 menuentry 'SerenityOS (normal)' {
   root=hd0,1
-  multiboot /boot/Kernel root=/dev/hda1
+  multiboot /boot/Bootloader root=/dev/hda1
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (text mode)' {
   root=hd0,1
-  multiboot /boot/Kernel boot_mode=no-fbdev root=/dev/hda1
+  multiboot /boot/Bootloader boot_mode=no-fbdev root=/dev/hda1
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (No ACPI)' {
   root=hd0,1
-  multiboot /boot/Kernel root=/dev/hda1 acpi=off
+  multiboot /boot/Bootloader root=/dev/hda1 acpi=off
+  module /boot/Kernel
 }
 
 menuentry 'SerenityOS (with serial debug)' {
   root=hd0,1
-  multiboot /boot/Kernel serial_debug root=/dev/hda1
+  multiboot /boot/Bootloader serial_debug root=/dev/hda1
+  module /boot/Kernel
 }
diff --git a/Meta/run.sh b/Meta/run.sh
index 48398a25f0..1da7bc6020 100755
--- a/Meta/run.sh
+++ b/Meta/run.sh
@@ -204,7 +204,8 @@ elif [ "$SERENITY_RUN" = "qn" ]; then
     "$SERENITY_QEMU_BIN" \
         $SERENITY_COMMON_QEMU_ARGS \
         -device e1000 \
-        -kernel Kernel/Kernel \
+        -kernel Kernel/Prekernel/Prekernel \
+        -initrd Kernel/Kernel \
         -append "${SERENITY_KERNEL_CMDLINE}"
 elif [ "$SERENITY_RUN" = "qtap" ]; then
     # Meta/run.sh qtap: qemu with tap
@@ -216,7 +217,8 @@ elif [ "$SERENITY_RUN" = "qtap" ]; then
         $SERENITY_PACKET_LOGGING_ARG \
         -netdev tap,ifname=tap0,id=br0 \
         -device e1000,netdev=br0 \
-        -kernel Kernel/Kernel \
+        -kernel Kernel/Prekernel/Prekernel \
+        -initrd Kernel/Kernel \
         -append "${SERENITY_KERNEL_CMDLINE}"
     sudo ip tuntap del dev tap0 mode tap
 elif [ "$SERENITY_RUN" = "qgrub" ]; then
@@ -235,8 +237,22 @@ elif [ "$SERENITY_RUN" = "q35" ]; then
         $SERENITY_VIRT_TECH_ARG \
         -netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
         -device e1000,netdev=breh \
-        -kernel Kernel/Kernel \
+        -kernel Kernel/Prekernel/Prekernel \
+        -initrd Kernel/Kernel \
         -append "${SERENITY_KERNEL_CMDLINE}"
+elif [ "$SERENITY_RUN" = "bootloader_test" ]; then
+    # Meta/run.sh q35: qemu (q35 chipset) with SerenityOS
+    echo "Starting SerenityOS with QEMU Q35 machine, Commandline: ${SERENITY_KERNEL_CMDLINE}"
+    "$SERENITY_QEMU_BIN" \
+        $SERENITY_COMMON_QEMU_Q35_ARGS \
+        $SERENITY_VIRT_TECH_ARG \
+        -netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23 \
+        -device e1000,netdev=breh \
+        -kernel Kernel/Prekernel/Prekernel \
+        -initrd Kernel/Kernel \
+        -append "${SERENITY_KERNEL_CMDLINE}" \
+        -no-reboot \
+        -no-shutdown
 elif [ "$SERENITY_RUN" = "ci" ]; then
     # Meta/run.sh ci: qemu in text mode
     echo "Running QEMU in CI"
@@ -252,7 +268,8 @@ elif [ "$SERENITY_RUN" = "ci" ]; then
         -nographic \
         -display none \
         -debugcon file:debug.log \
-        -kernel Kernel/Kernel \
+        -kernel Kernel/Prekernel/Prekernel \
+        -initrd Kernel/Kernel \
         -append "${SERENITY_KERNEL_CMDLINE}"
 else
     # Meta/run.sh: qemu with user networking
@@ -262,6 +279,7 @@ else
         $SERENITY_PACKET_LOGGING_ARG \
         -netdev user,id=breh,hostfwd=tcp:127.0.0.1:8888-10.0.2.15:8888,hostfwd=tcp:127.0.0.1:8823-10.0.2.15:23,hostfwd=tcp:127.0.0.1:8000-10.0.2.15:8000,hostfwd=tcp:127.0.0.1:2222-10.0.2.15:22 \
         -device e1000,netdev=breh \
-        -kernel Kernel/Kernel \
+        -kernel Kernel/Prekernel/Prekernel \
+        -initrd Kernel/Kernel \
         -append "${SERENITY_KERNEL_CMDLINE}"
 fi