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More complex physalloc

Jacob Lorentzon requested to merge 4lDO2/kernel:complex-physalloc into master

A very basic implementation of syscall!46 (merged).

Adds a better interface for drivers when allocating physical memory, such as allocating in 32-bit physical memory space (required for some e.g. XHCI when a special capability register indicates that 64-bit memory is unsupported). Also adds "partial allocation", where a driver can request a number of frames, but only receive up to min, which is useful for scatter-gather lists.

Edited by Jacob Lorentzon

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