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Kernel: Implement OffsetDiskDevice to prepare for partition support

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This implements a passthrough disk driver that translates the read/write
block addresses by a fixed offset. This could form the basis of MBR
partition support if we were to parse the MBR table at boot and create that
OffsetDiskDevice dynamically, rather than seeking to a fixed offset.

This also introduces a dependency in the form of grub. You'll need to have
32-bit grub binaries installed to build the project now.

As a bonus, divorcing Serenity from qemu's kernel loading means we can now
*technically* boot on real hardware. It just... doesn't get very far yet.
If you write the `_disk_image` file to an IDE hard drive and boot it in a
machine that supports all the basic PC hardware, it *will* start loading
the kernel.
This commit is contained in:
Conrad Pankoff 2019-06-02 18:58:59 +10:00 • committed by Andreas Kling
parent 5e1c7cb32c
commit 6f43f81fb4
8 changed files with 220 additions and 66 deletions
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1
Kernel/Makefile
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@ -65,6 +65,7 @@ VFS_OBJS = \
Devices/ZeroDevice.o \
Devices/RandomDevice.o \
Devices/DebugLogDevice.o \
Devices/OffsetDiskDevice.o \
FileSystem/FileSystem.o \
FileSystem/DiskBackedFileSystem.o \
FileSystem/Ext2FileSystem.o \