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The kernel can't use the limited paging tables of user processes.
Alternatively, sysenter could accept a parameter with a new cr3. That
would allow/require using paging in the kernel - so I'll switch to it
later, but I want to get other stuff done first.
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it's pretty useful, so it makes sense to define it alongside PAGE_SIZE
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stack_top got changed into a char, because `extern void` isn't even
valid. others are self-explanatory
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This loads a file from the boot disk into memory. Currently it just gets
printed, but it's going to become a real executable soon.
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Now, the kernel only interfaces with the architecture dependent stuff
via functions declared in generic.h. I'll write a linter enforcing this
soon.
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The idea is that src/kernel/ is only allowed to interface with the
hardware using whatever's defined in src/arch/generic.h. I'll probably
write a small script for checking this later on.
This is a giant commit so I've probably fucked something up. It boots
fine on Bochs and QEMU, so at least there's that.
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