Add support for PMP emulation #21
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This commit adds support for PMP virtualization. Note that the lock bit is not yet supported, thus PMPs are never enforced. The PMPs will need to be honoured when we will add support for running the OS.
This commit adds a test payload to exercise PMP emulation. For now QEMU exposes only 16 PMPs, so Mirage can only expose 0 to the payload to stay spec-compliant while keeping a few PMPs to protect itself. The commit does include a test function for 16 exposed PMPs, we can enable it later once more PMPs become available. Co-authored-by: Abel Vexina Wilkinson <abel.vexinawilkinson@epfl.ch>
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Rebasing #20 and squashing things around.
@fesqvw did all the work and gets the credit :)