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ASLR with dynamic physical memory mapping causes panic #525

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@splaled

When using ASLR with dynamic physical memory mapping, bootloader can randomly panic on INFO: Map physical memory. After this message bootloader panics with:

ERROR: panicked at /Users/splaled/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/x86_64-0.15.2/src/addr.rs:75:23:
virtual address must be sign extended in bits 48 to 64

I think an issue is in random address generator logic (it can produce noncanonical addresses)

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