libuvmem: usermode port of vmem(9)

The quantum cache is disabled, there is no uma.

Intent is to use this for resource allocation in bhyve(8), for start.
Addition of -luvmem to bhyve linking was done to test changes to share/mk.

Reviewed by:	bnovkov, markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D27220

lib/Makefile

@@ -107,6 +107,7 @@ SUBDIR=	${SUBDIR_BOOTSTRAP} \
 	libulog \
 	libutil \
 	libutil++ \
+	libuvmem \
 	${_libvgl} \
 	libwrap \
 	libxo \

lib/libuvmem/Makefile

@@ -0,0 +1,17 @@
+PACKAGE=	runtime
+
+LIB=		uvmem
+SRCS=		subr_vmem.c
+
+SHLIB_MAJOR=	1
+LIBADD+=	pthread
+CFLAGS.clang+=-Wno-thread-safety-analysis
+
+SYMBOL_MAPS=    ${.CURDIR}/Symbol.map
+VERSION_DEF=	${SRCTOP}/lib/libc/Versions.def
+
+.include <src.opts.mk>
+
+.PATH:	${SRCTOP}/sys/kern
+
+.include <bsd.lib.mk>

lib/libuvmem/Symbol.map

@@ -0,0 +1,15 @@
+FBSD_1.9 {
+	 vmem_add;
+	 vmem_alloc;
+	 vmem_create;
+	 vmem_destroy;
+	 vmem_free;
+	 vmem_init;
+	 vmem_roundup_size;
+	 vmem_set_import;
+	 vmem_set_limit;
+	 vmem_set_reclaim;
+	 vmem_size;
+	 vmem_xalloc;
+	 vmem_xfree;
+};