NVMM: Update examples and libnvmm tests

test/nvmm/demo: Improve progress logs to help test/debug

* Add several more progress logs.
* Reduce accepting trap count to 6, reducing the total test time.
* Update the example output in README.

test/nvmm/demo: Rewrite makefiles to not write in source tree

Rewrite the makefiles so it no longer write in the source tree but
output in the /tmp directory. This is useful for building with a
NFS

test/nvmm/demo: Rewrite makefiles to not write in source tree

Rewrite the makefiles so it no longer write in the source tree but
output in the /tmp directory. This is useful for building with a
NFS-exported readonly mount of the source tree (e.g., used by dillon).

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test/nvmm/demo: Port 'smallkern' to DragonFly

test/nvmm/demo: Make 'smallkern' more self-contained

Provide local 'asm.h' and 'trap.h' headers (derived from NetBSD),
extract necessary PTE_* and PSL_* defines, making 'smallkern' much more
self-co

test/nvmm/demo: Make 'smallkern' more self-contained

Provide local 'asm.h' and 'trap.h' headers (derived from NetBSD),
extract necessary PTE_* and PSL_* defines, making 'smallkern' much more
self-contained, which greatly reduces the needed modifications for
porting it to DragonFly. Moreover, it helps to keep the ported code
working on both operating systems.

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test/nvmm/demo: Various cleanups to 'smallkern'

* Remove unused variables, symbols, function prototypes and functions.
* Move function prototypes and 'extern' declarations to header files.
* Add 'st

test/nvmm/demo: Various cleanups to 'smallkern'

* Remove unused variables, symbols, function prototypes and functions.
* Move function prototypes and 'extern' declarations to header files.
* Add 'static' qualifier for file-local variables.
* Add inclusion guard to header files.
* Various minor adjustments.

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test/nvmm/demo: Fix some compilation warnings

test/nvmm/demo: Update makefiles and README

* Adjust makefiles to be a bit more generic.
* Adjust compiler flags to enable more warnings and debug info.
* Add top-level makefile to ease the build.
*

test/nvmm/demo: Update makefiles and README

* Adjust makefiles to be a bit more generic.
* Adjust compiler flags to enable more warnings and debug info.
* Add top-level makefile to ease the build.
* Update README.

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test/nvmm: Add a demo for demonstration of libnvmm(3) API

The demo consists of two components:

* toyvirt: a toy virtualizer, that executes in a VM the 64bit ELF binary
given as argument;
* smallk

test/nvmm: Add a demo for demonstration of libnvmm(3) API

The demo consists of two components:

* toyvirt: a toy virtualizer, that executes in a VM the 64bit ELF binary
given as argument;
* smallkern: an example of such binary.

Obtained from: https://www.netbsd.org/~maxv/nvmm/nvmm-demo.zip

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