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I really should just rename interrupts to something else.
This is inspired by Plan9 and meant to make debugging easier, as the
dying process can take a stacktrace etc.
It kinda sucks that the default handler now depends on fprintf, which is quite
a bit of code, but whatever.
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This is just for simplicity's sake.
I think I could even omit the `movw $TSS, (GdtTss + 2)` and have the linker
fill that out as a relocation, but that would probably be more complex overall.
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On the assembly side, ensure the stack frame looks always the same, by pushing
a fake "error code" for the interrupts that don't generate one.
On the C side, use a struct instead of magic indices into an "array", and
make it consistent with the current style.
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the vm isn't getting an NMI for any real reason anyways, so I might as well
abuse it
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not strictly necessary, but this should improve:
1. sleep performance
2. power efficiency when idle
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there's no real reason for bootstrap to be doing that, and this brings it closer
to only doing the elf loading
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I've wanted to do this for a while, and since I've just had a relatively
large refactor commit (pcpy), this is as good of a time as any.
Typedefing structs was mostly inspired by Plan 9's coding style. It makes
some lines of code much shorter at basically no expense.
Everything related to userland kept old-style struct definitions, so as not
to force that style onto other people.
I also considered changing SCREAMING_ENUM_FIELDS to NicerLookingCamelcase,
but I didn't, just in case that'd be confusing.
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