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Restrict the arm64 supervisor all instructions to only allow a zero

Description

Restrict the arm64 supervisor all instructions to only allow a zero
immediate value for system calls. We may wish to use other values in the
future for other purposes.

MFC after: 1 week
Sponsored by: DARPA, AFRL

Details

Provenance
andrewAuthored on
Parents
rS317196: Write-combine framebuffer writes through user-space mappings, if possible.
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