OS Headers hypercall.h/hypervisor.h

[Elliott Mitchell <ehem+xen@xxxxxxx>]

The hypercalls implementation for Linux and FreeBSD have two key headers,
hypercall.h and hypervisor.h.  I'm curious why the implementations for
x86 and ARM* are so distinct.

I found it fairly straightforward to implement ARM* versions of the x86
_hypercall#() macros.  Once that is done, most of the wrappers in the x86
hypercall.h can be moved to a shared hypervisor.h header.

Why does Xen/ARM on Linux still have hypercall.S when merging the
headers should reduce maintainance?

Was GCC extended inline assembly language for ARM* thought too awful?

I'm also curious why these headers are part of the Linux kernel, instead
of being maintained by the Xen Project?


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