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Now that we reclaim the memory range that is created by KASLR before
the start of the kernel image, there's no need to be conservative with
the KASLR offset.
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This ensures we don't just waste the memory range between the default
base load address and the actual load address that was shifted by the
KASLR offset.
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This enables further work on implementing KASLR by adding relocation
support to the pre-kernel and updating the kernel to be less dependent
on specific virtual memory layouts.
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This allows us to specify virtual addresses for things the kernel should
access via virtual addresses later on. By doing this we can make the
kernel independent from specific physical addresses.
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Previously the kernel relied on a fixed offset between virtual and
physical addresses based on the kernel's load address. This allows us
to specify an independent offset.
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This also removes the section attribute for kernel_base which had no
effect because the section wasn't included in the linker script.
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The kernel would just turn those virtual addresses into physical
addresses later on, so let's just use physical addresses right from the
start.
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Instead of manually redeclaring those variables in various files this
now adds a header file for them.
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