MFC r313439,r314450:

r313439:

Merge content from ^/projects/netbsd-tests-upstream-01-2017 into ^/head

The primary end-goal of this drop is ease future merges with NetBSD and
collaborate further with the NetBSD project.

The goal was (largely, not completely as some items are still oustanding
in the NetBSD GNATS system) achieved by doing the following:
- Pushing as many changes required to port contrib/netbsd-tests
  back to NetBSD as possible, then pull the upstream applied changes
  back in to FreeBSD.
- Diff reduce with upstream where possible by:
-- Improving libnetbsd header, etc compat glue.
-- Using _SED variables to modify test scripts on the fly for items
   that could not be upstreamed to NetBSD.

As a bonus for this work, this change also introduces testcases for
uniq(1).

Many thanks to Christos for working with me to get many of the changes
back into the NetBSD project.

In collaboration with:	Christos Zoulas <christos@netbsd.org>

r314450:

Add additional __FreeBSD_version guards around the hsearch_r testcases

The reasoning for this is the same as r276046: to ease MFCing the tests
to ^/stable/10 .

This was accidentally missed in r313439

2 files changed, 3117 insertions, 0 deletions

diff --git a/contrib/netbsd-tests/sys/uvm/t_uvm_physseg.c b/contrib/netbsd-tests/sys/uvm/t_uvm_physseg.c
new file mode 100644
index 0000000..a5f2fa9
--- /dev/null
+++ b/contrib/netbsd-tests/sys/uvm/t_uvm_physseg.c
@@ -0,0 +1,2377 @@
+/* $NetBSD: t_uvm_physseg.c,v 1.2 2016/12/22 08:15:20 cherry Exp $ */
+
+/*-
+ * Copyright (c) 2015, 2016 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Santhosh N. Raju <santhosh.raju@gmail.com> and
+ * by Cherry G. Mathew
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_uvm_physseg.c,v 1.2 2016/12/22 08:15:20 cherry Exp $");
+
+/*
+ * If this line is commented out tests related to uvm_physseg_get_pmseg()
+ * wont run.
+ *
+ * Have a look at machine/uvm_physseg.h for more details.
+ */
+#define __HAVE_PMAP_PHYSSEG
+
+/*
+ * This is a dummy struct used for testing purposes
+ *
+ * In reality this struct would exist in the MD part of the code residing in
+ * machines/vmparam.h
+ */
+
+#ifdef __HAVE_PMAP_PHYSSEG
+struct pmap_physseg {
+	int dummy_variable;		/* Dummy variable use for testing */
+};
+#endif
+
+/* Testing API - assumes userland */
+/* Provide Kernel API equivalents */
+#include <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h> /* memset(3) et. al */
+#include <stdio.h> /* printf(3) */
+#include <stdlib.h> /* malloc(3) */
+#include <stdarg.h>
+#include <stddef.h>
+
+#define	PRIxPADDR	"lx"
+#define	PRIxPSIZE	"lx"
+#define	PRIuPSIZE	"lu"
+#define	PRIxVADDR	"lx"
+#define	PRIxVSIZE	"lx"
+#define	PRIuVSIZE	"lu"
+
+#define UVM_HOTPLUG /* Enable hotplug with rbtree. */
+#define PMAP_STEAL_MEMORY
+#define DEBUG /* Enable debug functionality. */
+
+typedef unsigned long vaddr_t;
+typedef unsigned long paddr_t;
+typedef unsigned long psize_t;
+typedef unsigned long vsize_t;
+
+#include <uvm/uvm_physseg.h>
+#include <uvm/uvm_page.h>
+
+#ifndef DIAGNOSTIC
+#define	KASSERTMSG(e, msg, ...)	/* NOTHING */
+#define	KASSERT(e)		/* NOTHING */
+#else
+#define	KASSERT(a)		assert(a)
+#define KASSERTMSG(exp, ...)    printf(__VA_ARGS__); assert((exp))
+#endif
+
+#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
+
+#define VM_NFREELIST            4
+#define VM_FREELIST_DEFAULT     0
+#define VM_FREELIST_FIRST16     3
+#define VM_FREELIST_FIRST1G     2
+#define VM_FREELIST_FIRST4G     1
+
+/*
+ * Used in tests when Array implementation is tested
+ */
+#if !defined(VM_PHYSSEG_MAX)
+#define VM_PHYSSEG_MAX          1
+#endif
+
+#define PAGE_SHIFT              12
+#define PAGE_SIZE               (1 << PAGE_SHIFT)
+#define	PAGE_MASK	(PAGE_SIZE - 1)
+#define atop(x)         (((paddr_t)(x)) >> PAGE_SHIFT)
+#define ptoa(x)         (((paddr_t)(x)) << PAGE_SHIFT)
+
+#define	mutex_enter(l)
+#define	mutex_exit(l)
+
+psize_t physmem;
+
+struct uvmexp uvmexp;        /* decl */
+
+/*
+ * uvm structure borrowed from uvm.h
+ *
+ * Remember this is a dummy structure used within the ATF Tests and
+ * uses only necessary fields from the original uvm struct.
+ * See uvm/uvm.h for the full struct.
+ */
+
+struct uvm {
+	/* vm_page related parameters */
+
+	bool page_init_done;		/* TRUE if uvm_page_init() finished */
+} uvm;
+
+#include <sys/kmem.h>
+
+void *
+kmem_alloc(size_t size, km_flag_t flags)
+{
+	return malloc(size);
+}
+
+void *
+kmem_zalloc(size_t size, km_flag_t flags)
+{
+	void *ptr;
+	ptr = malloc(size);
+
+	memset(ptr, 0, size);
+
+	return ptr;
+}
+
+void
+kmem_free(void *mem, size_t size)
+{
+	free(mem);
+}
+
+static void
+panic(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vprintf(fmt, ap);
+	printf("\n");
+	va_end(ap);
+	KASSERT(false);
+
+	/*NOTREACHED*/
+}
+
+static void
+uvm_pagefree(struct vm_page *pg)
+{
+	return;
+}
+
+#if defined(UVM_HOTPLUG)
+static void
+uvmpdpol_reinit(void)
+{
+	return;
+}
+#endif /* UVM_HOTPLUG */
+
+/* end - Provide Kernel API equivalents */
+
+
+#include "uvm/uvm_physseg.c"
+
+#include <atf-c.h>
+
+#define SIXTYFOUR_KILO (64 * 1024)
+#define ONETWENTYEIGHT_KILO (128 * 1024)
+#define TWOFIFTYSIX_KILO (256 * 1024)
+#define FIVEONETWO_KILO (512 * 1024)
+#define ONE_MEGABYTE (1024 * 1024)
+#define TWO_MEGABYTE (2 * 1024 * 1024)
+
+/* Sample Page Frame Numbers */
+#define VALID_START_PFN_1 atop(0)
+#define VALID_END_PFN_1 atop(ONE_MEGABYTE)
+#define VALID_AVAIL_START_PFN_1 atop(0)
+#define VALID_AVAIL_END_PFN_1 atop(ONE_MEGABYTE)
+
+#define VALID_START_PFN_2 atop(ONE_MEGABYTE + 1)
+#define VALID_END_PFN_2 atop(ONE_MEGABYTE * 2)
+#define VALID_AVAIL_START_PFN_2 atop(ONE_MEGABYTE + 1)
+#define VALID_AVAIL_END_PFN_2 atop(ONE_MEGABYTE * 2)
+
+#define VALID_START_PFN_3 atop((ONE_MEGABYTE * 2) + 1)
+#define VALID_END_PFN_3 atop(ONE_MEGABYTE * 3)
+#define VALID_AVAIL_START_PFN_3 atop((ONE_MEGABYTE * 2) + 1)
+#define VALID_AVAIL_END_PFN_3 atop(ONE_MEGABYTE * 3)
+
+#define VALID_START_PFN_4 atop((ONE_MEGABYTE * 3) + 1)
+#define VALID_END_PFN_4 atop(ONE_MEGABYTE * 4)
+#define VALID_AVAIL_START_PFN_4 atop((ONE_MEGABYTE * 3) + 1)
+#define VALID_AVAIL_END_PFN_4 atop(ONE_MEGABYTE * 4)
+
+/*
+ * Total number of pages (of 4K size each) should be 256 for 1MB of memory.
+ */
+#define PAGE_COUNT_1M      256
+
+/*
+ * A debug fucntion to print the content of upm.
+ */
+	static inline void
+	uvm_physseg_dump_seg(uvm_physseg_t upm)
+	{
+#if defined(DEBUG)
+		printf("%s: seg->start == %ld\n", __func__,
+		    uvm_physseg_get_start(upm));
+		printf("%s: seg->end == %ld\n", __func__,
+		    uvm_physseg_get_end(upm));
+		printf("%s: seg->avail_start == %ld\n", __func__,
+		    uvm_physseg_get_avail_start(upm));
+		printf("%s: seg->avail_end == %ld\n", __func__,
+		    uvm_physseg_get_avail_end(upm));
+
+		printf("====\n\n");
+#else
+		return;
+#endif /* DEBUG */
+	}
+
+/*
+ * Private accessor that gets the value of uvm_physseg_graph.nentries
+ */
+static int
+uvm_physseg_get_entries(void)
+{
+#if defined(UVM_HOTPLUG)
+	return uvm_physseg_graph.nentries;
+#else
+	return vm_nphysmem;
+#endif /* UVM_HOTPLUG */
+}
+
+#if !defined(UVM_HOTPLUG)
+static void *
+uvm_physseg_alloc(size_t sz)
+{
+	return &vm_physmem[vm_nphysseg++];
+}
+#endif
+
+/*
+ * Test Fixture SetUp().
+ */
+static void
+setup(void)
+{
+	/* Prerequisites for running certain calls in uvm_physseg */
+	uvmexp.pagesize = PAGE_SIZE;
+	uvmexp.npages = 0;
+	uvm.page_init_done = false;
+	uvm_physseg_init();
+}
+
+
+/* <---- Tests for Internal functions ----> */
+#if defined(UVM_HOTPLUG)
+ATF_TC(uvm_physseg_alloc_atboot_mismatch);
+ATF_TC_HEAD(uvm_physseg_alloc_atboot_mismatch, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "boot time uvm_physseg_alloc() sanity"
+	    "size mismatch alloc() test.");
+}
+
+ATF_TC_BODY(uvm_physseg_alloc_atboot_mismatch, tc)
+{
+	uvm.page_init_done = false;
+
+	atf_tc_expect_signal(SIGABRT, "size mismatch alloc()");
+
+	uvm_physseg_alloc(sizeof(struct uvm_physseg) - 1);
+}
+
+ATF_TC(uvm_physseg_alloc_atboot_overrun);
+ATF_TC_HEAD(uvm_physseg_alloc_atboot_overrun, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "boot time uvm_physseg_alloc() sanity"
+	    "array overrun alloc() test.");
+}
+
+ATF_TC_BODY(uvm_physseg_alloc_atboot_overrun, tc)
+{
+	uvm.page_init_done = false;
+
+	atf_tc_expect_signal(SIGABRT, "array overrun alloc()");
+
+	uvm_physseg_alloc((VM_PHYSSEG_MAX + 1) * sizeof(struct uvm_physseg));
+
+}
+
+ATF_TC(uvm_physseg_alloc_sanity);
+ATF_TC_HEAD(uvm_physseg_alloc_sanity, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "further uvm_physseg_alloc() sanity checks");
+}
+
+ATF_TC_BODY(uvm_physseg_alloc_sanity, tc)
+{
+
+	/* At boot time */
+	uvm.page_init_done = false;
+
+	/* Correct alloc */
+	ATF_REQUIRE(uvm_physseg_alloc(VM_PHYSSEG_MAX * sizeof(struct uvm_physseg)));
+
+	/* Retry static alloc()s as dynamic - we expect them to pass */
+	uvm.page_init_done = true;
+	ATF_REQUIRE(uvm_physseg_alloc(sizeof(struct uvm_physseg) - 1));
+	ATF_REQUIRE(uvm_physseg_alloc(2 * VM_PHYSSEG_MAX * sizeof(struct uvm_physseg)));
+}
+
+ATF_TC(uvm_physseg_free_atboot_mismatch);
+ATF_TC_HEAD(uvm_physseg_free_atboot_mismatch, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "boot time uvm_physseg_free() sanity"
+	    "size mismatch free() test.");
+}
+
+ATF_TC_BODY(uvm_physseg_free_atboot_mismatch, tc)
+{
+	uvm.page_init_done = false;
+
+	atf_tc_expect_signal(SIGABRT, "size mismatch free()");
+
+	uvm_physseg_free(&uvm_physseg[0], sizeof(struct uvm_physseg) - 1);
+}
+
+ATF_TC(uvm_physseg_free_sanity);
+ATF_TC_HEAD(uvm_physseg_free_sanity, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "further uvm_physseg_free() sanity checks");
+}
+
+ATF_TC_BODY(uvm_physseg_free_sanity, tc)
+{
+
+	/* At boot time */
+	uvm.page_init_done = false;
+
+	struct uvm_physseg *seg;
+
+#if VM_PHYSSEG_MAX > 1
+	/*
+	 * Note: free()ing the entire array is considered to be an
+	 * error. Thus VM_PHYSSEG_MAX - 1.
+	 */
+
+	seg = uvm_physseg_alloc((VM_PHYSSEG_MAX - 1) * sizeof(*seg));
+	uvm_physseg_free(seg, (VM_PHYSSEG_MAX - 1) * sizeof(struct uvm_physseg));
+#endif
+
+	/* Retry static alloc()s as dynamic - we expect them to pass */
+	uvm.page_init_done = true;
+
+	seg = uvm_physseg_alloc(sizeof(struct uvm_physseg) - 1);
+	uvm_physseg_free(seg, sizeof(struct uvm_physseg) - 1);
+
+	seg = uvm_physseg_alloc(2 * VM_PHYSSEG_MAX * sizeof(struct uvm_physseg));
+
+	uvm_physseg_free(seg, 2 * VM_PHYSSEG_MAX * sizeof(struct uvm_physseg));
+}
+
+#if VM_PHYSSEG_MAX > 1
+ATF_TC(uvm_physseg_atboot_free_leak);
+ATF_TC_HEAD(uvm_physseg_atboot_free_leak, tc)
+{
+	atf_tc_set_md_var(tc, "descr",
+	    "does free() leak at boot ?\n"
+	    "This test needs VM_PHYSSEG_MAX > 1)");
+}
+
+ATF_TC_BODY(uvm_physseg_atboot_free_leak, tc)
+{
+
+	/* At boot time */
+	uvm.page_init_done = false;
+
+	/* alloc to array size */
+	struct uvm_physseg *seg;
+	seg = uvm_physseg_alloc(VM_PHYSSEG_MAX * sizeof(*seg));
+
+	uvm_physseg_free(seg, sizeof(*seg));
+
+	atf_tc_expect_signal(SIGABRT, "array overrun on alloc() after leak");
+
+	ATF_REQUIRE(uvm_physseg_alloc(sizeof(struct uvm_physseg)));
+}
+#endif /* VM_PHYSSEG_MAX */
+#endif /* UVM_HOTPLUG */
+
+/*
+ * Note: This function replicates verbatim what happens in
+ * uvm_page.c:uvm_page_init().
+ *
+ * Please track any changes that happen there.
+ */
+static void
+uvm_page_init_fake(struct vm_page *pagearray, psize_t pagecount)
+{
+	uvm_physseg_t bank;
+	size_t n;
+
+	for (bank = uvm_physseg_get_first(),
+		 uvm_physseg_seg_chomp_slab(bank, pagearray, pagecount);
+	     uvm_physseg_valid_p(bank);
+	     bank = uvm_physseg_get_next(bank)) {
+
+		n = uvm_physseg_get_end(bank) - uvm_physseg_get_start(bank);
+		uvm_physseg_seg_alloc_from_slab(bank, n);
+		uvm_physseg_init_seg(bank, pagearray);
+
+		/* set up page array pointers */
+		pagearray += n;
+		pagecount -= n;
+	}
+
+	uvm.page_init_done = true;
+}
+
+ATF_TC(uvm_physseg_plug);
+ATF_TC_HEAD(uvm_physseg_plug, tc)
+{
+	atf_tc_set_md_var(tc, "descr",
+	    "Test plug functionality.");
+}
+/* Note: We only do the second boot time plug if VM_PHYSSEG_MAX > 1 */
+ATF_TC_BODY(uvm_physseg_plug, tc)
+{
+	int nentries = 0; /* Count of entries via plug done so far */
+	uvm_physseg_t upm1;
+#if VM_PHYSSEG_MAX > 2
+	uvm_physseg_t upm2;
+#endif
+
+#if VM_PHYSSEG_MAX > 1
+	uvm_physseg_t upm3;
+#endif
+	uvm_physseg_t upm4;
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+	psize_t npages2 = (VALID_END_PFN_2 - VALID_START_PFN_2);
+	psize_t npages3 = (VALID_END_PFN_3 - VALID_START_PFN_3);
+	psize_t npages4 = (VALID_END_PFN_4 - VALID_START_PFN_4);
+	struct vm_page *pgs, *slab = malloc(sizeof(struct vm_page) * (npages1
+#if VM_PHYSSEG_MAX > 2
+		+ npages2
+#endif
+		+ npages3));
+
+	/* Fake early boot */
+
+	setup();
+
+	/* Vanilla plug x 2 */
+	ATF_REQUIRE_EQ(uvm_physseg_plug(VALID_START_PFN_1, npages1, &upm1), true);
+	ATF_REQUIRE_EQ(++nentries, uvm_physseg_get_entries());
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+#if VM_PHYSSEG_MAX > 2
+	ATF_REQUIRE_EQ(uvm_physseg_plug(VALID_START_PFN_2, npages2, &upm2), true);
+	ATF_REQUIRE_EQ(++nentries, uvm_physseg_get_entries());
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+#endif
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2 + npages3);
+
+	ATF_CHECK_EQ(npages1
+#if VM_PHYSSEG_MAX > 2
+	    + npages2
+#endif
+	    , uvmexp.npages);
+#if VM_PHYSSEG_MAX > 1
+	/* Scavenge plug - goes into the same slab */
+	ATF_REQUIRE_EQ(uvm_physseg_plug(VALID_START_PFN_3, npages3, &upm3), true);
+	ATF_REQUIRE_EQ(++nentries, uvm_physseg_get_entries());
+	ATF_REQUIRE_EQ(npages1
+#if VM_PHYSSEG_MAX > 2
+	    + npages2
+#endif
+	    + npages3, uvmexp.npages);
+
+	/* Scavenge plug should fit right in the slab */
+	pgs = uvm_physseg_get_pg(upm3, 0);
+	ATF_REQUIRE(pgs > slab && pgs < (slab + npages1 + npages2 + npages3));
+#endif
+	/* Hot plug - goes into a brand new slab */
+	ATF_REQUIRE_EQ(uvm_physseg_plug(VALID_START_PFN_4, npages4, &upm4), true);
+	/* The hot plug slab should have nothing to do with the original slab */
+	pgs = uvm_physseg_get_pg(upm4, 0);
+	ATF_REQUIRE(pgs < slab || pgs > (slab + npages1
+#if VM_PHYSSEG_MAX > 2
+		+ npages2
+#endif
+		+ npages3));
+
+}
+ATF_TC(uvm_physseg_unplug);
+ATF_TC_HEAD(uvm_physseg_unplug, tc)
+{
+	atf_tc_set_md_var(tc, "descr",
+	    "Test unplug functionality.");
+}
+ATF_TC_BODY(uvm_physseg_unplug, tc)
+{
+	paddr_t pa = 0;
+
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+	psize_t npages2 = (VALID_END_PFN_2 - VALID_START_PFN_2);
+	psize_t npages3 = (VALID_END_PFN_3 - VALID_START_PFN_3);
+
+	struct vm_page *slab = malloc(sizeof(struct vm_page) * (npages1 + npages2 + npages3));
+
+	uvm_physseg_t upm;
+
+	/* Boot time */
+	setup();
+
+	/* We start with zero segments */
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(atop(0), atop(ONE_MEGABYTE), NULL));
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+	/* Do we have an arbitrary offset in there ? */
+	uvm_physseg_find(atop(TWOFIFTYSIX_KILO), &pa);
+	ATF_REQUIRE_EQ(pa, atop(TWOFIFTYSIX_KILO));
+	ATF_REQUIRE_EQ(0, uvmexp.npages); /* Boot time sanity */
+
+#if VM_PHYSSEG_MAX == 1
+	/*
+	 * This is the curious case at boot time, of having one
+	 * extent(9) static entry per segment, which means that a
+	 * fragmenting unplug will fail.
+	 */
+	atf_tc_expect_signal(SIGABRT, "fragmenting unplug for single segment");
+
+	/*
+	 * In order to test the fragmenting cases, please set
+	 * VM_PHYSSEG_MAX > 1
+	 */
+#endif
+	/* Now let's unplug from the middle */
+	ATF_REQUIRE_EQ(true, uvm_physseg_unplug(atop(TWOFIFTYSIX_KILO), atop(FIVEONETWO_KILO)));
+	/* verify that a gap exists at TWOFIFTYSIX_KILO */
+	pa = 0; /* reset */
+	uvm_physseg_find(atop(TWOFIFTYSIX_KILO), &pa);
+	ATF_REQUIRE_EQ(pa, 0);
+
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2 + npages3);
+	/* Account for the unplug */
+	ATF_CHECK_EQ(atop(FIVEONETWO_KILO), uvmexp.npages);
+
+	/* Original entry should fragment into two */
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	upm = uvm_physseg_find(atop(TWOFIFTYSIX_KILO + FIVEONETWO_KILO), NULL);
+
+	ATF_REQUIRE(uvm_physseg_valid_p(upm));
+
+	/* Now unplug the tail fragment - should swallow the complete entry */
+	ATF_REQUIRE_EQ(true, uvm_physseg_unplug(atop(TWOFIFTYSIX_KILO + FIVEONETWO_KILO), atop(TWOFIFTYSIX_KILO)));
+
+	/* The "swallow" above should have invalidated the handle */
+	ATF_REQUIRE_EQ(false, uvm_physseg_valid_p(upm));
+
+	/* Only the first one is left now */
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Unplug from the back */
+	ATF_REQUIRE_EQ(true, uvm_physseg_unplug(atop(ONETWENTYEIGHT_KILO), atop(ONETWENTYEIGHT_KILO)));
+	/* Shouldn't change the number of segments */
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Unplug from the front */
+	ATF_REQUIRE_EQ(true, uvm_physseg_unplug(0, atop(SIXTYFOUR_KILO)));
+	/* Shouldn't change the number of segments */
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Unplugging the final fragment should fail */
+	atf_tc_expect_signal(SIGABRT, "Unplugging the last segment");
+	ATF_REQUIRE_EQ(true, uvm_physseg_unplug(atop(SIXTYFOUR_KILO), atop(SIXTYFOUR_KILO)));
+}
+
+
+/* <---- end Tests for Internal functions ----> */
+
+/* Tests for functions exported via uvm_physseg.h */
+ATF_TC(uvm_physseg_init);
+ATF_TC_HEAD(uvm_physseg_init, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_init() call\
+	    initializes the vm_physmem struct which holds the rb_tree.");
+}
+ATF_TC_BODY(uvm_physseg_init, tc)
+{
+	uvm_physseg_init();
+
+	ATF_REQUIRE_EQ(0, uvm_physseg_get_entries());
+}
+
+ATF_TC(uvm_page_physload_preload);
+ATF_TC_HEAD(uvm_page_physload_preload, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_physload() \
+	    call works without a panic() in a preload scenario.");
+}
+ATF_TC_BODY(uvm_page_physload_preload, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Should return a valid handle */
+	ATF_REQUIRE(uvm_physseg_valid_p(upm));
+
+	/* No pages should be allocated yet */
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* After the first call one segment should exist */
+	ATF_CHECK_EQ(1, uvm_physseg_get_entries());
+
+	/* Insert more than one segment iff VM_PHYSSEG_MAX > 1 */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	/* Should return a valid handle */
+	ATF_REQUIRE(uvm_physseg_valid_p(upm));
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* After the second call two segments should exist */
+	ATF_CHECK_EQ(2, uvm_physseg_get_entries());
+#endif
+}
+
+ATF_TC(uvm_page_physload_postboot);
+ATF_TC_HEAD(uvm_page_physload_postboot, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_physload() \
+	     panic()s in a post boot scenario.");
+}
+ATF_TC_BODY(uvm_page_physload_postboot, tc)
+{
+	uvm_physseg_t upm;
+
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+	psize_t npages2 = (VALID_END_PFN_2 - VALID_START_PFN_2);
+
+	struct vm_page *slab = malloc(sizeof(struct vm_page) * (npages1 + npages2));
+
+	setup();
+
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Should return a valid handle */
+	ATF_REQUIRE(uvm_physseg_valid_p(upm));
+
+	/* No pages should be allocated yet */
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* After the first call one segment should exist */
+	ATF_CHECK_EQ(1, uvm_physseg_get_entries());
+
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2);
+
+	atf_tc_expect_signal(SIGABRT,
+	    "uvm_page_physload() called post boot");
+
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	/* Should return a valid handle */
+	ATF_REQUIRE(uvm_physseg_valid_p(upm));
+
+	ATF_REQUIRE_EQ(npages1 + npages2, uvmexp.npages);
+
+	/* After the second call two segments should exist */
+	ATF_CHECK_EQ(2, uvm_physseg_get_entries());
+}
+
+ATF_TC(uvm_physseg_handle_immutable);
+ATF_TC_HEAD(uvm_physseg_handle_immutable, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the uvm_physseg_t handle is \
+	    immutable.");
+}
+ATF_TC_BODY(uvm_physseg_handle_immutable, tc)
+{
+	uvm_physseg_t upm;
+
+	/* We insert the segments in out of order */
+
+	setup();
+
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID_EMPTY, uvm_physseg_get_prev(upm));
+
+	/* Insert more than one segment iff VM_PHYSSEG_MAX > 1 */
+#if VM_PHYSSEG_MAX > 1
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	/* Fetch Previous, we inserted a lower value */
+	upm = uvm_physseg_get_prev(upm);
+
+#if !defined(UVM_HOTPLUG)
+	/*
+	 * This test is going to fail for the Array Implementation but is
+	 * expected to pass in the RB Tree implementation.
+	 */
+	/* Failure can be expected iff there are more than one handles */
+	atf_tc_expect_fail("Mutable handle in static array impl.");
+#endif
+	ATF_CHECK(UVM_PHYSSEG_TYPE_INVALID_EMPTY != upm);
+	ATF_CHECK_EQ(VALID_START_PFN_1, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_1, uvm_physseg_get_end(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_seg_chomp_slab);
+ATF_TC_HEAD(uvm_physseg_seg_chomp_slab, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "The slab import code.()");
+
+}
+ATF_TC_BODY(uvm_physseg_seg_chomp_slab, tc)
+{
+	int err;
+	size_t i;
+	struct uvm_physseg *seg;
+	struct vm_page *slab, *pgs;
+	const size_t npages = UVM_PHYSSEG_BOOT_UNPLUG_MAX; /* Number of pages */
+
+	setup();
+
+	/* This is boot time */
+	slab = malloc(sizeof(struct vm_page) * npages * 2);
+
+	seg = uvm_physseg_alloc(sizeof(struct uvm_physseg));
+
+	uvm_physseg_seg_chomp_slab(PHYSSEG_NODE_TO_HANDLE(seg), slab, npages * 2);
+
+	/* Should be able to allocate two 128 * sizeof(*slab) */
+	ATF_REQUIRE_EQ(0, extent_alloc(seg->ext, sizeof(*slab), 1, 0, EX_BOUNDZERO, (void *)&pgs));
+	err = extent_free(seg->ext, (u_long) pgs, sizeof(*slab), EX_BOUNDZERO);
+
+#if VM_PHYSSEG_MAX == 1
+	/*
+	 * free() needs an extra region descriptor, but we only have
+	 * one! The classic alloc() at free() problem
+	 */
+
+	ATF_REQUIRE_EQ(ENOMEM, err);
+#else
+	/* Try alloc/free at static time */
+	for (i = 0; i < npages; i++) {
+		ATF_REQUIRE_EQ(0, extent_alloc(seg->ext, sizeof(*slab), 1, 0, EX_BOUNDZERO, (void *)&pgs));
+		err = extent_free(seg->ext, (u_long) pgs, sizeof(*slab), EX_BOUNDZERO);
+		ATF_REQUIRE_EQ(0, err);
+	}
+#endif
+
+	/* Now setup post boot */
+	uvm.page_init_done = true;
+
+	uvm_physseg_seg_chomp_slab(PHYSSEG_NODE_TO_HANDLE(seg), slab, npages * 2);
+
+	/* Try alloc/free after uvm_page.c:uvm_page_init() as well */
+	for (i = 0; i < npages; i++) {
+		ATF_REQUIRE_EQ(0, extent_alloc(seg->ext, sizeof(*slab), 1, 0, EX_BOUNDZERO, (void *)&pgs));
+		err = extent_free(seg->ext, (u_long) pgs, sizeof(*slab), EX_BOUNDZERO);
+		ATF_REQUIRE_EQ(0, err);
+	}
+
+}
+
+ATF_TC(uvm_physseg_alloc_from_slab);
+ATF_TC_HEAD(uvm_physseg_alloc_from_slab, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "The slab alloc code.()");
+
+}
+ATF_TC_BODY(uvm_physseg_alloc_from_slab, tc)
+{
+	struct uvm_physseg *seg;
+	struct vm_page *slab, *pgs;
+	const size_t npages = UVM_PHYSSEG_BOOT_UNPLUG_MAX; /* Number of pages */
+
+	setup();
+
+	/* This is boot time */
+	slab = malloc(sizeof(struct vm_page) * npages * 2);
+
+	seg = uvm_physseg_alloc(sizeof(struct uvm_physseg));
+
+	uvm_physseg_seg_chomp_slab(PHYSSEG_NODE_TO_HANDLE(seg), slab, npages * 2);
+
+	pgs = uvm_physseg_seg_alloc_from_slab(PHYSSEG_NODE_TO_HANDLE(seg), npages);
+
+	ATF_REQUIRE(pgs != NULL);
+
+	/* Now setup post boot */
+	uvm.page_init_done = true;
+
+#if VM_PHYSSEG_MAX > 1
+	pgs = uvm_physseg_seg_alloc_from_slab(PHYSSEG_NODE_TO_HANDLE(seg), npages);
+	ATF_REQUIRE(pgs != NULL);
+#endif
+	atf_tc_expect_fail("alloc beyond extent");
+
+	pgs = uvm_physseg_seg_alloc_from_slab(PHYSSEG_NODE_TO_HANDLE(seg), npages);
+	ATF_REQUIRE(pgs != NULL);
+}
+
+ATF_TC(uvm_physseg_init_seg);
+ATF_TC_HEAD(uvm_physseg_init_seg, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if uvm_physseg_init_seg adds pages to"
+	    "uvmexp.npages");
+}
+ATF_TC_BODY(uvm_physseg_init_seg, tc)
+{
+	struct uvm_physseg *seg;
+	struct vm_page *slab, *pgs;
+	const size_t npages = UVM_PHYSSEG_BOOT_UNPLUG_MAX; /* Number of pages */
+
+	setup();
+
+	/* This is boot time */
+	slab = malloc(sizeof(struct vm_page) * npages * 2);
+
+	seg = uvm_physseg_alloc(sizeof(struct uvm_physseg));
+
+	uvm_physseg_seg_chomp_slab(PHYSSEG_NODE_TO_HANDLE(seg), slab, npages * 2);
+
+	pgs = uvm_physseg_seg_alloc_from_slab(PHYSSEG_NODE_TO_HANDLE(seg), npages);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	seg->start = 0;
+	seg->end = npages;
+
+	seg->avail_start = 0;
+	seg->avail_end = npages;
+
+	uvm_physseg_init_seg(PHYSSEG_NODE_TO_HANDLE(seg), pgs);
+
+	ATF_REQUIRE_EQ(npages, uvmexp.npages);
+}
+
+#if 0
+ATF_TC(uvm_physseg_init_seg);
+ATF_TC_HEAD(uvm_physseg_init_seg, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_physload() \
+	    call works without a panic() after Segment is inited.");
+}
+ATF_TC_BODY(uvm_physseg_init_seg, tc)
+{
+	uvm_physseg_t upm;
+	psize_t npages = (VALID_END_PFN_1 - VALID_START_PFN_1);
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(0, uvmexp.npages);
+
+	/*
+	 * Boot time physplug needs explicit external init,
+	 * Duplicate what uvm_page.c:uvm_page_init() does.
+	 * Note: not everything uvm_page_init() does gets done here.
+	 * Read the source.
+	 */
+	/* suck in backing slab, initialise extent. */
+	uvm_physseg_seg_chomp_slab(upm, pgs, npages);
+
+	/*
+	 * Actual pgs[] allocation, from extent.
+	 */
+	uvm_physseg_alloc_from_slab(upm, npages);
+
+	/* Now we initialize the segment */
+	uvm_physseg_init_seg(upm, pgs);
+
+	/* Done with boot simulation */
+	extent_init();
+	uvm.page_init_done = true;
+
+	/* We have total memory of 1MB */
+	ATF_CHECK_EQ(PAGE_COUNT_1M, uvmexp.npages);
+
+	upm =uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	/* We added another 1MB so PAGE_COUNT_1M + PAGE_COUNT_1M */
+	ATF_CHECK_EQ(PAGE_COUNT_1M + PAGE_COUNT_1M, uvmexp.npages);
+
+}
+#endif
+
+ATF_TC(uvm_physseg_get_start);
+ATF_TC_HEAD(uvm_physseg_get_start, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the start PFN is returned \
+	    correctly from a segment created via uvm_page_physload().");
+}
+ATF_TC_BODY(uvm_physseg_get_start, tc)
+{
+	uvm_physseg_t upm;
+
+	/* Fake early boot */
+	setup();
+
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(VALID_START_PFN_1, uvm_physseg_get_start(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_start_invalid);
+ATF_TC_HEAD(uvm_physseg_get_start_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the invalid / error conditions \
+	    correctly when uvm_physseg_get_start() is called with invalid \
+	    parameter values.");
+}
+ATF_TC_BODY(uvm_physseg_get_start_invalid, tc)
+{
+	/* Check for pgs == NULL */
+	setup();
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Force other check conditions */
+	uvm.page_init_done = true;
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(true, uvm.page_init_done);
+
+	/* Invalid uvm_physseg_t */
+	ATF_CHECK_EQ((paddr_t) -1,
+	    uvm_physseg_get_start(UVM_PHYSSEG_TYPE_INVALID));
+}
+
+ATF_TC(uvm_physseg_get_end);
+ATF_TC_HEAD(uvm_physseg_get_end, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the end PFN is returned \
+	    correctly from a segment created via uvm_page_physload().");
+}
+ATF_TC_BODY(uvm_physseg_get_end, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(VALID_END_PFN_1, uvm_physseg_get_end(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_end_invalid);
+ATF_TC_HEAD(uvm_physseg_get_end_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the invalid / error conditions \
+	    correctly when uvm_physseg_get_end() is called with invalid \
+	    parameter values.");
+}
+ATF_TC_BODY(uvm_physseg_get_end_invalid, tc)
+{
+	/* Check for pgs == NULL */
+	setup();
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Force other check conditions */
+	uvm.page_init_done = true;
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(true, uvm.page_init_done);
+
+	/* Invalid uvm_physseg_t */
+	ATF_CHECK_EQ((paddr_t) -1,
+	    uvm_physseg_get_end(UVM_PHYSSEG_TYPE_INVALID));
+}
+
+ATF_TC(uvm_physseg_get_avail_start);
+ATF_TC_HEAD(uvm_physseg_get_avail_start, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the avail_start PFN is \
+	    returned correctly from a segment created via uvm_page_physload().");
+}
+ATF_TC_BODY(uvm_physseg_get_avail_start, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_1, uvm_physseg_get_avail_start(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2, uvm_physseg_get_avail_start(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_avail_start_invalid);
+ATF_TC_HEAD(uvm_physseg_get_avail_start_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the invalid / error conditions \
+	    correctly when uvm_physseg_get_avail_start() is called with invalid\
+	    parameter values.");
+}
+ATF_TC_BODY(uvm_physseg_get_avail_start_invalid, tc)
+{
+	/* Check for pgs == NULL */
+	setup();
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Force other check conditions */
+	uvm.page_init_done = true;
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(true, uvm.page_init_done);
+
+	/* Invalid uvm_physseg_t */
+	ATF_CHECK_EQ((paddr_t) -1,
+	    uvm_physseg_get_avail_start(UVM_PHYSSEG_TYPE_INVALID));
+}
+
+ATF_TC(uvm_physseg_get_avail_end);
+ATF_TC_HEAD(uvm_physseg_get_avail_end, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the avail_end PFN is \
+	    returned correctly from a segment created via uvm_page_physload().");
+}
+ATF_TC_BODY(uvm_physseg_get_avail_end, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_1, uvm_physseg_get_avail_end(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2, uvm_physseg_get_avail_end(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_avail_end_invalid);
+ATF_TC_HEAD(uvm_physseg_get_avail_end_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the invalid / error conditions \
+	    correctly when uvm_physseg_get_avail_end() is called with invalid\
+	    parameter values.");
+}
+ATF_TC_BODY(uvm_physseg_get_avail_end_invalid, tc)
+{
+	/* Check for pgs == NULL */
+	setup();
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Force other check conditions */
+	uvm.page_init_done = true;
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(true, uvm.page_init_done);
+
+	/* Invalid uvm_physseg_t */
+	ATF_CHECK_EQ((paddr_t) -1,
+	    uvm_physseg_get_avail_end(UVM_PHYSSEG_TYPE_INVALID));
+}
+
+ATF_TC(uvm_physseg_get_next);
+ATF_TC_HEAD(uvm_physseg_get_next, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the pointer values for next \
+	    segment using the uvm_physseg_get_next() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_next, tc)
+{
+	uvm_physseg_t upm;
+#if VM_PHYSSEG_MAX > 1
+	uvm_physseg_t upm_next;
+#endif
+
+	/* We insert the segments in ascending order */
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID_OVERFLOW,
+	    uvm_physseg_get_next(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm_next = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	upm = uvm_physseg_get_next(upm); /* Fetch Next */
+
+	ATF_CHECK_EQ(upm_next, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+#endif
+
+	/* This test will be triggered only if there are 3 or more segments. */
+#if VM_PHYSSEG_MAX > 2
+	upm_next = uvm_page_physload(VALID_START_PFN_3, VALID_END_PFN_3,
+	    VALID_AVAIL_START_PFN_3, VALID_AVAIL_END_PFN_3, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(3, uvm_physseg_get_entries());
+
+	upm = uvm_physseg_get_next(upm); /* Fetch Next */
+
+	ATF_CHECK_EQ(upm_next, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_3, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_3, uvm_physseg_get_end(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_next_invalid);
+ATF_TC_HEAD(uvm_physseg_get_next_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the invalid / error conditions \
+	    correctly when uvm_physseg_get_next() is called with invalid \
+	    parameter values.");
+}
+ATF_TC_BODY(uvm_physseg_get_next_invalid, tc)
+{
+	uvm_physseg_t upm = UVM_PHYSSEG_TYPE_INVALID;
+
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID, uvm_physseg_get_next(upm));
+}
+
+ATF_TC(uvm_physseg_get_prev);
+ATF_TC_HEAD(uvm_physseg_get_prev, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the pointer values for previous \
+	    segment using the uvm_physseg_get_prev() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_prev, tc)
+{
+#if VM_PHYSSEG_MAX > 1
+	uvm_physseg_t upm;
+#endif
+	uvm_physseg_t upm_prev;
+
+
+	setup();
+	upm_prev = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID_EMPTY,
+	    uvm_physseg_get_prev(upm_prev));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	/* Fetch Previous, we inserted a lower value */
+	upm = uvm_physseg_get_prev(upm);
+
+	ATF_CHECK_EQ(upm_prev, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_1, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_1, uvm_physseg_get_end(upm));
+#endif
+
+	/* This test will be triggered only if there are 3 or more segments. */
+#if VM_PHYSSEG_MAX > 2
+	uvm_page_physload(VALID_START_PFN_3, VALID_END_PFN_3,
+	    VALID_AVAIL_START_PFN_3, VALID_AVAIL_END_PFN_3, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(3, uvm_physseg_get_entries());
+
+	/*
+	 * This will return a UVM_PHYSSEG_TYPE_INVALID_EMPTY we are at the
+	 * lowest
+	 */
+	upm = uvm_physseg_get_prev(upm);
+
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID_EMPTY, upm);
+#endif
+}
+
+ATF_TC(uvm_physseg_get_prev_invalid);
+ATF_TC_HEAD(uvm_physseg_get_prev_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the invalid / error conditions \
+	    correctly when uvm_physseg_get_prev() is called with invalid \
+	    parameter values.");
+}
+ATF_TC_BODY(uvm_physseg_get_prev_invalid, tc)
+{
+	uvm_physseg_t upm = UVM_PHYSSEG_TYPE_INVALID;
+
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID, uvm_physseg_get_prev(upm));
+}
+
+ATF_TC(uvm_physseg_get_first);
+ATF_TC_HEAD(uvm_physseg_get_first, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the pointer values for first \
+	    segment (lowest node) using the uvm_physseg_get_first() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_first, tc)
+{
+	uvm_physseg_t upm = UVM_PHYSSEG_TYPE_INVALID_EMPTY;
+	uvm_physseg_t upm_first;
+
+	/* Fake early boot */
+	setup();
+
+	/* No nodes exist */
+	ATF_CHECK_EQ(upm, uvm_physseg_get_first());
+
+	upm_first = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Pointer to first should be the least valued node */
+	upm = uvm_physseg_get_first();
+	ATF_CHECK_EQ(upm_first, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2, uvm_physseg_get_avail_end(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	/* Insert a node of lesser value */
+	upm_first = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_CHECK_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	/* Pointer to first should be the least valued node */
+	upm = uvm_physseg_get_first();
+	ATF_CHECK_EQ(upm_first, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_1, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_1, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_1, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_1, uvm_physseg_get_avail_end(upm));
+#endif
+
+	/* This test will be triggered only if there are 3 or more segments. */
+#if VM_PHYSSEG_MAX > 2
+	/* Insert a node of higher value */
+	upm_first =uvm_page_physload(VALID_START_PFN_3, VALID_END_PFN_3,
+	    VALID_AVAIL_START_PFN_3, VALID_AVAIL_END_PFN_3, VM_FREELIST_DEFAULT);
+
+	ATF_CHECK_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(3, uvm_physseg_get_entries());
+
+	/* Pointer to first should be the least valued node */
+	upm = uvm_physseg_get_first();
+	ATF_CHECK(upm_first != upm);
+	ATF_CHECK_EQ(VALID_START_PFN_1, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_1, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_1, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_1, uvm_physseg_get_avail_end(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_last);
+ATF_TC_HEAD(uvm_physseg_get_last, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the pointer values for last \
+	    segment using the uvm_physseg_get_last() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_last, tc)
+{
+	uvm_physseg_t upm = UVM_PHYSSEG_TYPE_INVALID_EMPTY;
+	uvm_physseg_t upm_last;
+
+	setup();
+
+	/* No nodes exist */
+	ATF_CHECK_EQ(upm, uvm_physseg_get_last());
+
+	upm_last = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Pointer to last should be the most valued node */
+	upm = uvm_physseg_get_last();
+	ATF_CHECK_EQ(upm_last, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_1, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_1, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_1, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_1, uvm_physseg_get_avail_end(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	/* Insert node of greater value */
+	upm_last = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	/* Pointer to last should be the most valued node */
+	upm = uvm_physseg_get_last();
+	ATF_CHECK_EQ(upm_last, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2, uvm_physseg_get_avail_end(upm));
+#endif
+
+	/* This test will be triggered only if there are 3 or more segments. */
+#if VM_PHYSSEG_MAX > 2
+	/* Insert node of greater value */
+	upm_last = uvm_page_physload(VALID_START_PFN_3, VALID_END_PFN_3,
+	    VALID_AVAIL_START_PFN_3, VALID_AVAIL_END_PFN_3, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(3, uvm_physseg_get_entries());
+
+	/* Pointer to last should be the most valued node */
+	upm = uvm_physseg_get_last();
+	ATF_CHECK_EQ(upm_last, upm);
+	ATF_CHECK_EQ(VALID_START_PFN_3, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_3, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_3, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_3, uvm_physseg_get_avail_end(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_valid);
+ATF_TC_HEAD(uvm_physseg_valid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the pointer value for current \
+	    segment is valid using the uvm_physseg_valid_p() call.");
+}
+ATF_TC_BODY(uvm_physseg_valid, tc)
+{
+	psize_t npages = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_REQUIRE_EQ(PAGE_COUNT_1M, uvmexp.npages);
+
+	ATF_CHECK_EQ(true, uvm_physseg_valid_p(upm));
+}
+
+ATF_TC(uvm_physseg_valid_invalid);
+ATF_TC_HEAD(uvm_physseg_valid_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests the pointer value for current \
+	    segment is invalid using the uvm_physseg_valid_p() call.");
+}
+ATF_TC_BODY(uvm_physseg_valid_invalid, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Force other check conditions */
+	uvm.page_init_done = true;
+
+	ATF_REQUIRE_EQ(true, uvm.page_init_done);
+
+	/* Invalid uvm_physseg_t */
+	ATF_CHECK_EQ(false, uvm_physseg_valid_p(UVM_PHYSSEG_TYPE_INVALID));
+
+	/*
+	 * Without any pages initialized for segment, it is considered
+	 * invalid
+	 */
+	ATF_CHECK_EQ(false, uvm_physseg_valid_p(upm));
+}
+
+ATF_TC(uvm_physseg_get_highest);
+ATF_TC_HEAD(uvm_physseg_get_highest, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned PFN matches  \
+	    the highest PFN in use by the system.");
+}
+ATF_TC_BODY(uvm_physseg_get_highest, tc)
+{
+	setup();
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Only one segment so highest is the current */
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_1 - 1, uvm_physseg_get_highest_frame());
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	uvm_page_physload(VALID_START_PFN_3, VALID_END_PFN_3,
+	    VALID_AVAIL_START_PFN_3, VALID_AVAIL_END_PFN_3, VM_FREELIST_DEFAULT);
+
+	/* PFN_3 > PFN_1 */
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_3 - 1, uvm_physseg_get_highest_frame());
+#endif
+
+	/* This test will be triggered only if there are 3 or more segments. */
+#if VM_PHYSSEG_MAX > 2
+	uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	/* PFN_3 > PFN_2 */
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_3 - 1, uvm_physseg_get_highest_frame());
+#endif
+}
+
+ATF_TC(uvm_physseg_get_free_list);
+ATF_TC_HEAD(uvm_physseg_get_free_list, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned Free List type \
+	    of a segment matches the one returned from \
+	    uvm_physseg_get_free_list() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_free_list, tc)
+{
+	uvm_physseg_t upm;
+
+	/* Fake early boot */
+	setup();
+
+	/* Insertions are made in ascending order */
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_CHECK_EQ(VM_FREELIST_DEFAULT, uvm_physseg_get_free_list(upm));
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_FIRST16);
+
+	ATF_CHECK_EQ(VM_FREELIST_FIRST16, uvm_physseg_get_free_list(upm));
+#endif
+
+	/* This test will be triggered only if there are 3 or more segments. */
+#if VM_PHYSSEG_MAX > 2
+	upm = uvm_page_physload(VALID_START_PFN_3, VALID_END_PFN_3,
+	    VALID_AVAIL_START_PFN_3, VALID_AVAIL_END_PFN_3, VM_FREELIST_FIRST1G);
+
+	ATF_CHECK_EQ(VM_FREELIST_FIRST1G, uvm_physseg_get_free_list(upm));
+#endif
+}
+
+ATF_TC(uvm_physseg_get_start_hint);
+ATF_TC_HEAD(uvm_physseg_get_start_hint, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned start_hint value \
+	    of a segment matches the one returned from \
+	    uvm_physseg_get_start_hint() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_start_hint, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Will be Zero since no specific value is set during init */
+	ATF_CHECK_EQ(0, uvm_physseg_get_start_hint(upm));
+}
+
+ATF_TC(uvm_physseg_set_start_hint);
+ATF_TC_HEAD(uvm_physseg_set_start_hint, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned start_hint value \
+	    of a segment matches the one set by the \
+	    uvm_physseg_set_start_hint() call.");
+}
+ATF_TC_BODY(uvm_physseg_set_start_hint, tc)
+{
+	psize_t npages = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_CHECK_EQ(true, uvm_physseg_set_start_hint(upm, atop(128)));
+
+	/* Will be atop(128) since no specific value is set above */
+	ATF_CHECK_EQ(atop(128), uvm_physseg_get_start_hint(upm));
+}
+
+ATF_TC(uvm_physseg_set_start_hint_invalid);
+ATF_TC_HEAD(uvm_physseg_set_start_hint_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned value is false \
+	    when an invalid segment matches the one trying to set by the \
+	    uvm_physseg_set_start_hint() call.");
+}
+ATF_TC_BODY(uvm_physseg_set_start_hint_invalid, tc)
+{
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	/* Force other check conditions */
+	uvm.page_init_done = true;
+
+	ATF_REQUIRE_EQ(true, uvm.page_init_done);
+
+	ATF_CHECK_EQ(false, uvm_physseg_set_start_hint(upm, atop(128)));
+
+	/*
+	 * Will be Zero since no specific value is set after the init
+	 * due to failure
+	 */
+	atf_tc_expect_signal(SIGABRT, "invalid uvm_physseg_t handle");
+
+	ATF_CHECK_EQ(0, uvm_physseg_get_start_hint(upm));
+}
+
+ATF_TC(uvm_physseg_get_pg);
+ATF_TC_HEAD(uvm_physseg_get_pg, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned vm_page struct \
+	    is correct when fetched by uvm_physseg_get_pg() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_pg, tc)
+{
+	psize_t npages = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	struct vm_page *extracted_pg = NULL;
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* Now we initialize the segment */
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_REQUIRE_EQ(PAGE_COUNT_1M, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(NULL, extracted_pg);
+
+	/* Try fetching the 5th Page in the Segment */
+	extracted_pg = uvm_physseg_get_pg(upm, 5);
+
+	/* Values of phys_addr is n * PAGE_SIZE where n is the page number */
+	ATF_CHECK_EQ(5 * PAGE_SIZE, extracted_pg->phys_addr);
+
+	/* Try fetching the 113th Page in the Segment */
+	extracted_pg = uvm_physseg_get_pg(upm, 113);
+
+	ATF_CHECK_EQ(113 * PAGE_SIZE, extracted_pg->phys_addr);
+}
+
+#ifdef __HAVE_PMAP_PHYSSEG
+ATF_TC(uvm_physseg_get_pmseg);
+ATF_TC_HEAD(uvm_physseg_get_pmseg, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned pmap_physseg \
+	    struct is correct when fetched by uvm_physseg_get_pmseg() call.");
+}
+ATF_TC_BODY(uvm_physseg_get_pmseg, tc)
+{
+	psize_t npages = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	struct pmap_physseg pmseg = { true };
+
+	struct pmap_physseg *extracted_pmseg = NULL;
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* Now we initialize the segment */
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_REQUIRE_EQ(PAGE_COUNT_1M, uvmexp.npages);
+
+	ATF_REQUIRE_EQ(NULL, extracted_pmseg);
+
+	ATF_REQUIRE_EQ(true, pmseg.dummy_variable);
+
+	/* Extract the current pmseg */
+	extracted_pmseg = uvm_physseg_get_pmseg(upm);
+
+	/*
+	 * We can only check if it is not NULL
+	 * We do not know the value it contains
+	 */
+	ATF_CHECK(NULL != extracted_pmseg);
+
+	extracted_pmseg->dummy_variable = pmseg.dummy_variable;
+
+	/* Invert value to ensure test integrity */
+	pmseg.dummy_variable = false;
+
+	ATF_REQUIRE_EQ(false, pmseg.dummy_variable);
+
+	extracted_pmseg = uvm_physseg_get_pmseg(upm);
+
+	ATF_CHECK(NULL != extracted_pmseg);
+
+	ATF_CHECK_EQ(true, extracted_pmseg->dummy_variable);
+}
+#endif
+
+ATF_TC(vm_physseg_find);
+ATF_TC_HEAD(vm_physseg_find, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned segment number \
+	    is correct when an PFN is passed into uvm_physseg_find() call. \
+	    In addition	to this the offset of the PFN from the start of \
+	    segment is also set if the parameter is passed in as not NULL.");
+}
+ATF_TC_BODY(vm_physseg_find, tc)
+{
+	psize_t offset = (psize_t) -1;
+
+	uvm_physseg_t upm_first, result;
+#if VM_PHYSSEG_MAX > 1
+	uvm_physseg_t upm_second;
+#endif
+
+	setup();
+
+	upm_first = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	upm_second = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+#endif
+
+	/* Under ONE_MEGABYTE is segment upm_first */
+	result = uvm_physseg_find(atop(ONE_MEGABYTE - 1024), NULL);
+	ATF_CHECK_EQ(upm_first, result);
+	ATF_CHECK_EQ(uvm_physseg_get_start(upm_first),
+	    uvm_physseg_get_start(result));
+	ATF_CHECK_EQ(uvm_physseg_get_end(upm_first),
+	    uvm_physseg_get_end(result));
+	ATF_CHECK_EQ(uvm_physseg_get_avail_start(upm_first),
+	    uvm_physseg_get_avail_start(result));
+	ATF_CHECK_EQ(uvm_physseg_get_avail_end(upm_first),
+	    uvm_physseg_get_avail_end(result));
+
+	ATF_REQUIRE_EQ((psize_t) -1, offset);
+
+	/* This test will be triggered only if there are 2 or more segments. */
+#if VM_PHYSSEG_MAX > 1
+	/* Over ONE_MEGABYTE is segment upm_second */
+	result = uvm_physseg_find(atop(ONE_MEGABYTE + 8192), &offset);
+	ATF_CHECK_EQ(upm_second, result);
+	ATF_CHECK_EQ(uvm_physseg_get_start(upm_second),
+	    uvm_physseg_get_start(result));
+	ATF_CHECK_EQ(uvm_physseg_get_end(upm_second),
+	    uvm_physseg_get_end(result));
+	ATF_CHECK_EQ(uvm_physseg_get_avail_start(upm_second),
+	    uvm_physseg_get_avail_start(result));
+	ATF_CHECK_EQ(uvm_physseg_get_avail_end(upm_second),
+	    uvm_physseg_get_avail_end(result));
+
+	/* Offset is calculated based on PAGE_SIZE */
+	/* atop(ONE_MEGABYTE + (2 * PAGE_SIZE)) - VALID_START_PFN1  = 2 */
+	ATF_CHECK_EQ(2, offset);
+#else
+	/* Under ONE_MEGABYTE is segment upm_first */
+	result = uvm_physseg_find(atop(ONE_MEGABYTE - 12288), &offset);
+	ATF_CHECK_EQ(upm_first, result);
+	ATF_CHECK_EQ(uvm_physseg_get_start(upm_first),
+	    uvm_physseg_get_start(result));
+	ATF_CHECK_EQ(uvm_physseg_get_end(upm_first),
+	    uvm_physseg_get_end(result));
+	ATF_CHECK_EQ(uvm_physseg_get_avail_start(upm_first),
+	    uvm_physseg_get_avail_start(result));
+	ATF_CHECK_EQ(uvm_physseg_get_avail_end(upm_first),
+	    uvm_physseg_get_avail_end(result));
+
+	/* Offset is calculated based on PAGE_SIZE */
+	/* atop(ONE_MEGABYTE - (3 * PAGE_SIZE)) - VALID_START_PFN1  = 253 */
+	ATF_CHECK_EQ(253, offset);
+#endif
+}
+
+ATF_TC(vm_physseg_find_invalid);
+ATF_TC_HEAD(vm_physseg_find_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the returned segment number \
+	    is (paddr_t) -1  when a non existant PFN is passed into \
+	    uvm_physseg_find() call.");
+}
+ATF_TC_BODY(vm_physseg_find_invalid, tc)
+{
+	psize_t offset = (psize_t) -1;
+
+	setup();
+	uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* No segments over 3 MB exists at the moment */
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID,
+	    uvm_physseg_find(atop(ONE_MEGABYTE * 3), NULL));
+
+	ATF_REQUIRE_EQ((psize_t) -1, offset);
+
+	/* No segments over 3 MB exists at the moment */
+	ATF_CHECK_EQ(UVM_PHYSSEG_TYPE_INVALID,
+	    uvm_physseg_find(atop(ONE_MEGABYTE * 3), &offset));
+
+	ATF_CHECK_EQ((psize_t) -1, offset);
+}
+
+ATF_TC(uvm_page_physunload_start);
+ATF_TC_HEAD(uvm_page_physunload_start, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_physunload()\
+	    call works without a panic(). Unloads from Start of the segment.");
+}
+ATF_TC_BODY(uvm_page_physunload_start, tc)
+{
+	/*
+	 * Would uvmexp.npages reduce everytime an uvm_page_physunload is called?
+	 */
+	psize_t npages = (VALID_END_PFN_2 - VALID_START_PFN_2);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_CHECK_EQ(true, uvm_page_physunload(upm, VM_FREELIST_DEFAULT, &p));
+
+	/*
+	 * When called for first time, uvm_page_physload() removes the first PFN
+	 *
+	 * New avail start will be VALID_AVAIL_START_PFN_2 + 1
+	 */
+	ATF_CHECK_EQ(VALID_START_PFN_2, atop(p));
+
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2 + 1,
+	    uvm_physseg_get_avail_start(upm));
+
+	ATF_CHECK_EQ(VALID_START_PFN_2 + 1, uvm_physseg_get_start(upm));
+
+	/* Rest of the stuff should remain the same */
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2, uvm_physseg_get_avail_end(upm));
+}
+
+ATF_TC(uvm_page_physunload_end);
+ATF_TC_HEAD(uvm_page_physunload_end, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_physunload()\
+	    call works without a panic(). Unloads from End of the segment.");
+}
+ATF_TC_BODY(uvm_page_physunload_end, tc)
+{
+	/*
+	 * Would uvmexp.npages reduce everytime an uvm_page_physunload is called?
+	 */
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+	/* Note: start != avail_start to remove from end. */
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2 + 1, VALID_AVAIL_END_PFN_2,
+	    VM_FREELIST_DEFAULT);
+
+	p = 0;
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE(
+		uvm_physseg_get_avail_start(upm) != uvm_physseg_get_start(upm));
+
+	ATF_CHECK_EQ(true, uvm_page_physunload(upm, VM_FREELIST_DEFAULT, &p));
+
+	/*
+	 * Remember if X is the upper limit the actual valid pointer is X - 1
+	 *
+	 * For example if 256 is the upper limit for 1MB memory, last valid
+	 * pointer is 256 - 1 = 255
+	 */
+
+	ATF_CHECK_EQ(VALID_END_PFN_2 - 1, atop(p));
+
+	/*
+	 * When called for second time, uvm_page_physload() removes the last PFN
+	 *
+	 * New avail end will be VALID_AVAIL_END_PFN_2 - 1
+	 * New end will be VALID_AVAIL_PFN_2 - 1
+	 */
+
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2 - 1, uvm_physseg_get_avail_end(upm));
+
+	ATF_CHECK_EQ(VALID_END_PFN_2 - 1, uvm_physseg_get_end(upm));
+
+	/* Rest of the stuff should remain the same */
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2 + 1,
+	    uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+}
+
+ATF_TC(uvm_page_physunload_none);
+ATF_TC_HEAD(uvm_page_physunload_none, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic uvm_page_physunload()\
+	    call works without a panic(). Does not unload from start or end \
+	    because of non-aligned start / avail_start and end / avail_end \
+	    respectively.");
+}
+ATF_TC_BODY(uvm_page_physunload_none, tc)
+{
+	psize_t npages = (VALID_END_PFN_2 - VALID_START_PFN_2);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+	/*
+	 * Note: start != avail_start and end != avail_end.
+	 *
+	 * This prevents any unload from occuring.
+	 */
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2 + 1, VALID_AVAIL_END_PFN_2 - 1,
+	    VM_FREELIST_DEFAULT);
+
+	p = 0;
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_REQUIRE(
+		uvm_physseg_get_avail_start(upm) != uvm_physseg_get_start(upm));
+
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_CHECK_EQ(false, uvm_page_physunload(upm, VM_FREELIST_DEFAULT, &p));
+
+	/* uvm_page_physload() will no longer unload memory */
+	ATF_CHECK_EQ(0, p);
+
+	/* Rest of the stuff should remain the same */
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2 + 1,
+	    uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2 - 1,
+	    uvm_physseg_get_avail_end(upm));
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+}
+
+ATF_TC(uvm_page_physunload_delete_start);
+ATF_TC_HEAD(uvm_page_physunload_delete_start, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the  uvm_page_physunload() \
+	    works when the segment gets small enough to be deleted scenario. \
+	    NOTE: This one works deletes from start.");
+}
+ATF_TC_BODY(uvm_page_physunload_delete_start, tc)
+{
+	/*
+	 * Would uvmexp.npages reduce everytime an uvm_page_physunload is called?
+	 */
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+
+	/*
+	 * Setup the Nuke from Starting point
+	 */
+
+	upm = uvm_page_physload(VALID_END_PFN_1 - 1, VALID_END_PFN_1,
+	    VALID_AVAIL_END_PFN_1 - 1, VALID_AVAIL_END_PFN_1,
+	    VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* Insert more than one segment iff VM_PHYSSEG_MAX > 1 */
+#if VM_PHYSSEG_MAX > 1
+	uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+#endif
+
+#if VM_PHYSSEG_MAX == 1
+	atf_tc_expect_signal(SIGABRT,
+	    "cannot uvm_page_physunload() the last segment");
+#endif
+
+	ATF_CHECK_EQ(true, uvm_page_physunload(upm, VM_FREELIST_DEFAULT, &p));
+
+	ATF_CHECK_EQ(VALID_END_PFN_1 - 1, atop(p));
+
+	ATF_CHECK_EQ(1, uvm_physseg_get_entries());
+
+	/* The only node now is the one we inserted second. */
+	upm = uvm_physseg_get_first();
+
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2, uvm_physseg_get_avail_end(upm));
+}
+
+ATF_TC(uvm_page_physunload_delete_end);
+ATF_TC_HEAD(uvm_page_physunload_delete_end, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the  uvm_page_physunload() \
+	    works when the segment gets small enough to be deleted scenario. \
+	    NOTE: This one works deletes from end.");
+}
+ATF_TC_BODY(uvm_page_physunload_delete_end, tc)
+{
+	/*
+	 * Would uvmexp.npages reduce everytime an uvm_page_physunload is called?
+	 */
+
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+
+	/*
+	 * Setup the Nuke from Ending point
+	 */
+
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_START_PFN_1 + 2,
+	    VALID_AVAIL_START_PFN_1 + 1, VALID_AVAIL_START_PFN_1 + 2,
+	    VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* Insert more than one segment iff VM_PHYSSEG_MAX > 1 */
+#if VM_PHYSSEG_MAX > 1
+	uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+#endif
+
+#if VM_PHYSSEG_MAX == 1
+	atf_tc_expect_signal(SIGABRT,
+	    "cannot uvm_page_physunload() the last segment");
+#endif
+
+	ATF_CHECK_EQ(true, uvm_page_physunload(upm, VM_FREELIST_DEFAULT, &p));
+
+	p = 0;
+
+	ATF_CHECK_EQ(true, uvm_page_physunload(upm, VM_FREELIST_DEFAULT, &p));
+
+	ATF_CHECK_EQ(VALID_START_PFN_1 + 2, atop(p));
+
+	ATF_CHECK_EQ(1, uvm_physseg_get_entries());
+
+	/* The only node now is the one we inserted second. */
+	upm = uvm_physseg_get_first();
+
+	ATF_CHECK_EQ(VALID_START_PFN_2, uvm_physseg_get_start(upm));
+	ATF_CHECK_EQ(VALID_END_PFN_2, uvm_physseg_get_end(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_START_PFN_2, uvm_physseg_get_avail_start(upm));
+	ATF_CHECK_EQ(VALID_AVAIL_END_PFN_2, uvm_physseg_get_avail_end(upm));
+}
+
+ATF_TC(uvm_page_physunload_invalid);
+ATF_TC_HEAD(uvm_page_physunload_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the  uvm_page_physunload() \
+	    fails when then Free list does not match.");
+}
+ATF_TC_BODY(uvm_page_physunload_invalid, tc)
+{
+	psize_t npages = (VALID_END_PFN_2 - VALID_START_PFN_2);
+
+	struct vm_page *pgs = malloc(sizeof(struct vm_page) * npages);
+
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	uvm_physseg_init_seg(upm, pgs);
+
+	ATF_CHECK_EQ(false, uvm_page_physunload(upm, VM_FREELIST_FIRST4G, &p));
+}
+
+ATF_TC(uvm_page_physunload_force);
+ATF_TC_HEAD(uvm_page_physunload_force, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the basic \
+	    uvm_page_physunload_force() including delete works without.");
+}
+ATF_TC_BODY(uvm_page_physunload_force, tc)
+{
+	/*
+	 * Would uvmexp.npages reduce everytime an uvm_page_physunload is called?
+	 */
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_1, VALID_END_PFN_1,
+	    VALID_AVAIL_START_PFN_1, VALID_AVAIL_END_PFN_1, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	/* Insert more than one segment iff VM_PHYSSEG_MAX > 1 */
+#if VM_PHYSSEG_MAX > 1
+	/*
+	 * We have couple of physloads done this is bacause of the fact that if
+	 * we physunload all the PFs from a given range and we have only one
+	 * segment in total a panic() is called
+	 */
+	uvm_page_physload(VALID_START_PFN_2, VALID_END_PFN_2,
+	    VALID_AVAIL_START_PFN_2, VALID_AVAIL_END_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+#endif
+
+#if VM_PHYSSEG_MAX == 1
+	atf_tc_expect_signal(SIGABRT,
+	    "cannot uvm_page_physunload() the last segment");
+#endif
+
+	ATF_REQUIRE_EQ(VALID_AVAIL_START_PFN_1,
+	    uvm_physseg_get_avail_start(upm));
+
+	for(paddr_t i = VALID_AVAIL_START_PFN_1;
+	    i < VALID_AVAIL_END_PFN_1; i++) {
+		ATF_CHECK_EQ(true,
+		    uvm_page_physunload_force(upm, VM_FREELIST_DEFAULT, &p));
+		ATF_CHECK_EQ(i, atop(p));
+
+		if(i + 1 < VALID_AVAIL_END_PFN_1)
+			ATF_CHECK_EQ(i + 1, uvm_physseg_get_avail_start(upm));
+	}
+
+	/*
+	 * Now we try to retrieve the segment, which has been removed
+	 * from the system through force unloading all the pages inside it.
+	 */
+	upm = uvm_physseg_find(VALID_AVAIL_END_PFN_1 - 1, NULL);
+
+	/* It should no longer exist */
+	ATF_CHECK_EQ(NULL, upm);
+
+	ATF_CHECK_EQ(1, uvm_physseg_get_entries());
+}
+
+ATF_TC(uvm_page_physunload_force_invalid);
+ATF_TC_HEAD(uvm_page_physunload_force_invalid, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Tests if the invalid conditions for \
+	    uvm_page_physunload_force_invalid().");
+}
+ATF_TC_BODY(uvm_page_physunload_force_invalid, tc)
+{
+	paddr_t p = 0;
+
+	uvm_physseg_t upm;
+
+	setup();
+	upm = uvm_page_physload(VALID_START_PFN_2, VALID_START_PFN_2+ 1,
+	    VALID_START_PFN_2, VALID_START_PFN_2, VM_FREELIST_DEFAULT);
+
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	ATF_REQUIRE_EQ(0, uvmexp.npages);
+
+	ATF_CHECK_EQ(false,
+	    uvm_page_physunload_force(upm, VM_FREELIST_DEFAULT, &p));
+
+	ATF_CHECK_EQ(0, p);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+#if defined(UVM_HOTPLUG)
+	/* Internal */
+	ATF_TP_ADD_TC(tp, uvm_physseg_alloc_atboot_mismatch);
+	ATF_TP_ADD_TC(tp, uvm_physseg_alloc_atboot_overrun);
+	ATF_TP_ADD_TC(tp, uvm_physseg_alloc_sanity);
+	ATF_TP_ADD_TC(tp, uvm_physseg_free_atboot_mismatch);
+	ATF_TP_ADD_TC(tp, uvm_physseg_free_sanity);
+#if VM_PHYSSEG_MAX > 1
+	ATF_TP_ADD_TC(tp, uvm_physseg_atboot_free_leak);
+#endif
+#endif /* UVM_HOTPLUG */
+
+	ATF_TP_ADD_TC(tp, uvm_physseg_plug);
+	ATF_TP_ADD_TC(tp, uvm_physseg_unplug);
+
+	/* Exported */
+	ATF_TP_ADD_TC(tp, uvm_physseg_init);
+	ATF_TP_ADD_TC(tp, uvm_page_physload_preload);
+	ATF_TP_ADD_TC(tp, uvm_page_physload_postboot);
+	ATF_TP_ADD_TC(tp, uvm_physseg_handle_immutable);
+	ATF_TP_ADD_TC(tp, uvm_physseg_seg_chomp_slab);
+	ATF_TP_ADD_TC(tp, uvm_physseg_alloc_from_slab);
+	ATF_TP_ADD_TC(tp, uvm_physseg_init_seg);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_start);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_start_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_end);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_end_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_avail_start);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_avail_start_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_avail_end);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_avail_end_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_next);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_next_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_prev);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_prev_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_first);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_last);
+	ATF_TP_ADD_TC(tp, uvm_physseg_valid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_valid_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_highest);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_free_list);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_start_hint);
+	ATF_TP_ADD_TC(tp, uvm_physseg_set_start_hint);
+	ATF_TP_ADD_TC(tp, uvm_physseg_set_start_hint_invalid);
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_pg);
+
+#ifdef __HAVE_PMAP_PHYSSEG
+	ATF_TP_ADD_TC(tp, uvm_physseg_get_pmseg);
+#endif
+	ATF_TP_ADD_TC(tp, vm_physseg_find);
+	ATF_TP_ADD_TC(tp, vm_physseg_find_invalid);
+
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_start);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_end);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_none);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_delete_start);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_delete_end);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_invalid);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_force);
+	ATF_TP_ADD_TC(tp, uvm_page_physunload_force_invalid);
+
+	return atf_no_error();
+}
diff --git a/contrib/netbsd-tests/sys/uvm/t_uvm_physseg_load.c b/contrib/netbsd-tests/sys/uvm/t_uvm_physseg_load.c
new file mode 100644
index 0000000..a150f69
--- /dev/null
+++ b/contrib/netbsd-tests/sys/uvm/t_uvm_physseg_load.c
@@ -0,0 +1,740 @@
+/* $NetBSD: t_uvm_physseg_load.c,v 1.2 2016/12/22 08:15:20 cherry Exp $ */
+
+/*-
+ * Copyright (c) 2015, 2016 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Santhosh N. Raju <santhosh.raju@gmail.com> and
+ * by Cherry G. Mathew
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: t_uvm_physseg_load.c,v 1.2 2016/12/22 08:15:20 cherry Exp $");
+
+/*
+ * If this line is commented out tests related touvm_physseg_get_pmseg()
+ * wont run.
+ *
+ * Have a look at machine/uvm_physseg.h for more details.
+ */
+#define __HAVE_PMAP_PHYSSEG
+
+/*
+ * This is a dummy struct used for testing purposes
+ *
+ * In reality this struct would exist in the MD part of the code residing in
+ * machines/vmparam.h
+ */
+
+#ifdef __HAVE_PMAP_PHYSSEG
+struct pmap_physseg {
+	int dummy_variable;		/* Dummy variable use for testing */
+};
+#endif
+
+/* Testing API - assumes userland */
+/* Provide Kernel API equivalents */
+#include <assert.h>
+#include <stdbool.h>
+#include <string.h> /* memset(3) et. al */
+#include <stdio.h> /* printf(3) */
+#include <stdlib.h> /* malloc(3) */
+#include <stdarg.h>
+#include <stddef.h>
+#include <time.h>
+
+#define	PRIxPADDR	"lx"
+#define	PRIxPSIZE	"lx"
+#define	PRIuPSIZE	"lu"
+#define	PRIxVADDR	"lx"
+#define	PRIxVSIZE	"lx"
+#define	PRIuVSIZE	"lu"
+
+#define UVM_HOTPLUG /* Enable hotplug with rbtree. */
+#define PMAP_STEAL_MEMORY
+#define DEBUG /* Enable debug functionality. */
+
+typedef unsigned long vaddr_t;
+typedef unsigned long paddr_t;
+typedef unsigned long psize_t;
+typedef unsigned long vsize_t;
+
+#include <uvm/uvm_physseg.h>
+#include <uvm/uvm_page.h>
+
+#ifndef DIAGNOSTIC
+#define	KASSERTMSG(e, msg, ...)	/* NOTHING */
+#define	KASSERT(e)		/* NOTHING */
+#else
+#define	KASSERT(a)		assert(a)
+#define KASSERTMSG(exp, ...)    printf(__VA_ARGS__); assert((exp))
+#endif
+
+#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
+
+#define VM_NFREELIST            4
+#define VM_FREELIST_DEFAULT     0
+#define VM_FREELIST_FIRST16     3
+#define VM_FREELIST_FIRST1G     2
+#define VM_FREELIST_FIRST4G     1
+
+/*
+ * Used in tests when Array implementation is tested
+ */
+#if !defined(VM_PHYSSEG_MAX)
+#define VM_PHYSSEG_MAX          32
+#endif
+
+#define PAGE_SIZE               4096
+#define PAGE_SHIFT              12
+#define atop(x)         (((paddr_t)(x)) >> PAGE_SHIFT)
+
+#define	mutex_enter(l)
+#define	mutex_exit(l)
+
+#define	_SYS_KMEM_H_ /* Disallow the real kmem API (see below) */
+/* free(p) XXX: pgs management need more thought */
+#define kmem_alloc(size, flags) malloc(size)
+#define kmem_zalloc(size, flags) malloc(size)
+#define kmem_free(p, size) free(p)
+
+psize_t physmem;
+
+struct uvmexp uvmexp;        /* decl */
+
+/*
+ * uvm structure borrowed from uvm.h
+ *
+ * Remember this is a dummy structure used within the ATF Tests and
+ * uses only necessary fields from the original uvm struct.
+ * See uvm/uvm.h for the full struct.
+ */
+
+struct uvm {
+	/* vm_page related parameters */
+
+	bool page_init_done;		/* TRUE if uvm_page_init() finished */
+} uvm;
+
+static void
+panic(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	vprintf(fmt, ap);
+	printf("\n");
+	va_end(ap);
+	KASSERT(false);
+
+	/*NOTREACHED*/
+}
+
+static void
+uvm_pagefree(struct vm_page *pg)
+{
+	return;
+}
+
+#if defined(UVM_HOTPLUG)
+static void
+uvmpdpol_reinit(void)
+{
+	return;
+}
+#endif /* UVM_HOTPLUG */
+
+/* end - Provide Kernel API equivalents */
+
+#include "uvm/uvm_physseg.c"
+
+#include <atf-c.h>
+
+#define ONE_MEGABYTE 1024 * 1024
+
+/* Sample Page Frame Numbers */
+#define VALID_START_PFN_1 atop(0)
+#define VALID_END_PFN_1 atop(ONE_MEGABYTE)
+#define VALID_AVAIL_START_PFN_1 atop(0)
+#define VALID_AVAIL_END_PFN_1 atop(ONE_MEGABYTE)
+
+#define VALID_START_PFN_2 atop(ONE_MEGABYTE + 1)
+#define VALID_END_PFN_2 atop(ONE_MEGABYTE * 2)
+#define VALID_AVAIL_START_PFN_2 atop(ONE_MEGABYTE + 1)
+#define VALID_AVAIL_END_PFN_2 atop(ONE_MEGABYTE * 2)
+
+#define VALID_START_PFN_3 atop((ONE_MEGABYTE * 2) + 1)
+#define VALID_END_PFN_3 atop(ONE_MEGABYTE * 3)
+#define VALID_AVAIL_START_PFN_3 atop((ONE_MEGABYTE * 2) + 1)
+#define VALID_AVAIL_END_PFN_3 atop(ONE_MEGABYTE * 3)
+
+#define VALID_START_PFN_4 atop(ONE_MEGABYTE + 1)
+#define VALID_END_PFN_4 atop(ONE_MEGABYTE * 128)
+#define VALID_AVAIL_START_PFN_4 atop(ONE_MEGABYTE + 1)
+#define VALID_AVAIL_END_PFN_4 atop(ONE_MEGABYTE * 128)
+
+#define VALID_START_PFN_5 atop(ONE_MEGABYTE + 1)
+#define VALID_END_PFN_5 atop(ONE_MEGABYTE * 256)
+#define VALID_AVAIL_START_PFN_5 atop(ONE_MEGABYTE + 1)
+#define VALID_AVAIL_END_PFN_5 atop(ONE_MEGABYTE * 256)
+
+/*
+ * Total number of pages (of 4K size each) should be 256 for 1MB of memory.
+ */
+#define PAGE_COUNT_1M      256
+
+/*
+ * The number of Page Frames to allot per segment
+ */
+#define PF_STEP 8
+
+/*
+ * A debug fucntion to print the content of upm.
+ */
+	static inline void
+	uvm_physseg_dump_seg(uvm_physseg_t upm)
+	{
+#if defined(DEBUG)
+		printf("%s: seg->start == %ld\n", __func__,
+		    uvm_physseg_get_start(upm));
+		printf("%s: seg->end == %ld\n", __func__,
+		    uvm_physseg_get_end(upm));
+		printf("%s: seg->avail_start == %ld\n", __func__,
+		    uvm_physseg_get_avail_start(upm));
+		printf("%s: seg->avail_end == %ld\n", __func__,
+		    uvm_physseg_get_avail_end(upm));
+
+		printf("====\n\n");
+#else
+		return;
+#endif /* DEBUG */
+	}
+
+/*
+ * Private accessor that gets the value of vm_physmem.nentries
+ */
+static int
+uvm_physseg_get_entries(void)
+{
+#if defined(UVM_HOTPLUG)
+	return uvm_physseg_graph.nentries;
+#else
+	return vm_nphysmem;
+#endif /* UVM_HOTPLUG */
+}
+
+/*
+ * Note: This function replicates verbatim what happens in
+ * uvm_page.c:uvm_page_init().
+ *
+ * Please track any changes that happen there.
+ */
+static void
+uvm_page_init_fake(struct vm_page *pagearray, psize_t pagecount)
+{
+	uvm_physseg_t bank;
+	size_t n;
+
+	for (bank = uvm_physseg_get_first(),
+		 uvm_physseg_seg_chomp_slab(bank, pagearray, pagecount);
+	     uvm_physseg_valid_p(bank);
+	     bank = uvm_physseg_get_next(bank)) {
+
+		n = uvm_physseg_get_end(bank) - uvm_physseg_get_start(bank);
+		uvm_physseg_seg_alloc_from_slab(bank, n);
+		uvm_physseg_init_seg(bank, pagearray);
+
+		/* set up page array pointers */
+		pagearray += n;
+		pagecount -= n;
+	}
+
+	uvm.page_init_done = true;
+}
+
+/*
+ * PHYS_TO_VM_PAGE: find vm_page for a PA.   used by MI code to get vm_pages
+ * back from an I/O mapping (ugh!).   used in some MD code as well.
+ */
+static struct vm_page *
+uvm_phys_to_vm_page(paddr_t pa)
+{
+	paddr_t pf = atop(pa);
+	paddr_t off;
+	uvm_physseg_t psi;
+
+	psi = uvm_physseg_find(pf, &off);
+	if (psi != UVM_PHYSSEG_TYPE_INVALID)
+		return uvm_physseg_get_pg(psi, off);
+	return(NULL);
+}
+
+//static paddr_t
+//uvm_vm_page_to_phys(const struct vm_page *pg)
+//{
+//
+//	return pg->phys_addr;
+//}
+
+/*
+ * XXX: To do, write control test cases for uvm_vm_page_to_phys().
+ */
+
+/* #define VM_PAGE_TO_PHYS(entry)  uvm_vm_page_to_phys(entry) */
+
+#define PHYS_TO_VM_PAGE(pa)     uvm_phys_to_vm_page(pa)
+
+/*
+ * Test Fixture SetUp().
+ */
+static void
+setup(void)
+{
+	/* Prerequisites for running certain calls in uvm_physseg */
+	uvmexp.pagesize = PAGE_SIZE;
+	uvmexp.npages = 0;
+	uvm.page_init_done = false;
+	uvm_physseg_init();
+}
+
+ATF_TC(uvm_physseg_100);
+ATF_TC_HEAD(uvm_physseg_100, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    100 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_100, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 100; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_1K);
+ATF_TC_HEAD(uvm_physseg_1K, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    1000 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_1K, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 1000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_10K);
+ATF_TC_HEAD(uvm_physseg_10K, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    10,000 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_10K, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 10000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_100K);
+ATF_TC_HEAD(uvm_physseg_100K, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    100,000 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_100K, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 100000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_1M);
+ATF_TC_HEAD(uvm_physseg_1M, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    1,000,000 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_1M, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 1000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_10M);
+ATF_TC_HEAD(uvm_physseg_10M, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    10,000,000 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_10M, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 10000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_100M);
+ATF_TC_HEAD(uvm_physseg_100M, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    100,000,000 calls, VM_PHYSSEG_MAX is 32.");
+}
+ATF_TC_BODY(uvm_physseg_100M, tc)
+{
+	paddr_t pa;
+
+	setup();
+
+	for(paddr_t i = VALID_START_PFN_1;
+	    i < VALID_END_PFN_1; i += PF_STEP) {
+		uvm_page_physload(i, i + PF_STEP, i, i + PF_STEP,
+		    VM_FREELIST_DEFAULT);
+	}
+
+	ATF_REQUIRE_EQ(VM_PHYSSEG_MAX, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(int i = 0; i < 100000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_1);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_1MB);
+ATF_TC_HEAD(uvm_physseg_1MB, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    10,000,000 calls, VM_PHYSSEG_MAX is 32 on 1 MB Segment.");
+}
+ATF_TC_BODY(uvm_physseg_1MB, t)
+{
+	paddr_t pa = 0;
+
+	paddr_t pf = 0;
+
+	psize_t pf_chunk_size = 0;
+
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	psize_t npages2 = (VALID_END_PFN_2 - VALID_START_PFN_2);
+
+	struct vm_page *slab = malloc(sizeof(struct vm_page) *
+	    (npages1 + npages2));
+
+	setup();
+
+	/* We start with zero segments */
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_1, npages1, NULL));
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2);
+
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_2, npages2, NULL));
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(pf = VALID_START_PFN_2; pf < VALID_END_PFN_2; pf += PF_STEP) {
+		pf_chunk_size = (psize_t) random() % (psize_t) (PF_STEP - 1) + 1;
+		uvm_physseg_unplug(pf, pf_chunk_size);
+	}
+
+	for(int i = 0; i < 10000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_2);
+		if(pa < ctob(VALID_START_PFN_2))
+			pa += ctob(VALID_START_PFN_2);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_64MB);
+ATF_TC_HEAD(uvm_physseg_64MB, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    10,000,000 calls, VM_PHYSSEG_MAX is 32 on 64 MB Segment.");
+}
+ATF_TC_BODY(uvm_physseg_64MB, t)
+{
+	paddr_t pa = 0;
+
+	paddr_t pf = 0;
+
+	psize_t pf_chunk_size = 0;
+
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	psize_t npages2 = (VALID_END_PFN_3 - VALID_START_PFN_3);
+
+	struct vm_page *slab = malloc(sizeof(struct vm_page)  *
+	    (npages1 + npages2));
+
+	setup();
+
+	/* We start with zero segments */
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_1, npages1, NULL));
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2);
+
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_3, npages2, NULL));
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(pf = VALID_START_PFN_3; pf < VALID_END_PFN_3; pf += PF_STEP) {
+		pf_chunk_size = (psize_t) random() % (psize_t) (PF_STEP - 1) + 1;
+		uvm_physseg_unplug(pf, pf_chunk_size);
+	}
+
+	for(int i = 0; i < 10000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_3);
+		if(pa < ctob(VALID_START_PFN_3))
+			pa += ctob(VALID_START_PFN_3);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_128MB);
+ATF_TC_HEAD(uvm_physseg_128MB, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    10,000,000 calls, VM_PHYSSEG_MAX is 32 on 128 MB Segment.");
+}
+ATF_TC_BODY(uvm_physseg_128MB, t)
+{
+	paddr_t pa = 0;
+
+	paddr_t pf = 0;
+
+	psize_t pf_chunk_size = 0;
+
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	psize_t npages2 = (VALID_END_PFN_4 - VALID_START_PFN_4);
+
+	struct vm_page *slab = malloc(sizeof(struct vm_page)
+	    * (npages1 + npages2));
+
+	setup();
+
+	/* We start with zero segments */
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_1, npages1, NULL));
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2);
+
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_2, npages2, NULL));
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(pf = VALID_START_PFN_4; pf < VALID_END_PFN_4; pf += PF_STEP) {
+		pf_chunk_size = (psize_t) random() % (psize_t) (PF_STEP - 1) + 1;
+		uvm_physseg_unplug(pf, pf_chunk_size);
+	}
+
+	for(int i = 0; i < 10000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_4);
+		if(pa < ctob(VALID_START_PFN_4))
+			pa += ctob(VALID_START_PFN_4);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TC(uvm_physseg_256MB);
+ATF_TC_HEAD(uvm_physseg_256MB, tc)
+{
+	atf_tc_set_md_var(tc, "descr", "Load test uvm_phys_to_vm_page() with \
+	    10,000,000 calls, VM_PHYSSEG_MAX is 32 on 256 MB Segment.");
+}
+ATF_TC_BODY(uvm_physseg_256MB, t)
+{
+	paddr_t pa = 0;
+
+	paddr_t pf = 0;
+
+	psize_t pf_chunk_size = 0;
+
+	psize_t npages1 = (VALID_END_PFN_1 - VALID_START_PFN_1);
+
+	psize_t npages2 = (VALID_END_PFN_5 - VALID_START_PFN_5);
+
+	struct vm_page *slab = malloc(sizeof(struct vm_page)  * (npages1 + npages2));
+
+	setup();
+
+	/* We start with zero segments */
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_1, npages1, NULL));
+	ATF_REQUIRE_EQ(1, uvm_physseg_get_entries());
+
+	/* Post boot: Fake all segments and pages accounted for. */
+	uvm_page_init_fake(slab, npages1 + npages2);
+
+	ATF_REQUIRE_EQ(true, uvm_physseg_plug(VALID_START_PFN_2, npages2, NULL));
+	ATF_REQUIRE_EQ(2, uvm_physseg_get_entries());
+
+	srandom((unsigned)time(NULL));
+	for(pf = VALID_START_PFN_5; pf < VALID_END_PFN_5; pf += PF_STEP) {
+		pf_chunk_size = (psize_t) random() % (psize_t) (PF_STEP - 1) + 1;
+		uvm_physseg_unplug(pf, pf_chunk_size);
+	}
+
+	for(int i = 0; i < 10000000; i++) {
+		pa = (paddr_t) random() % (paddr_t) ctob(VALID_END_PFN_5);
+		if(pa < ctob(VALID_END_PFN_5))
+			pa += ctob(VALID_START_PFN_5);
+		PHYS_TO_VM_PAGE(pa);
+	}
+
+	ATF_CHECK_EQ(true, true);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	/* Fixed memory size tests. */
+	ATF_TP_ADD_TC(tp, uvm_physseg_100);
+	ATF_TP_ADD_TC(tp, uvm_physseg_1K);
+	ATF_TP_ADD_TC(tp, uvm_physseg_10K);
+	ATF_TP_ADD_TC(tp, uvm_physseg_100K);
+	ATF_TP_ADD_TC(tp, uvm_physseg_1M);
+	ATF_TP_ADD_TC(tp, uvm_physseg_10M);
+	ATF_TP_ADD_TC(tp, uvm_physseg_100M);
+
+#if defined(UVM_HOTPLUG)
+	/* Variable memory size tests. */
+	ATF_TP_ADD_TC(tp, uvm_physseg_1MB);
+	ATF_TP_ADD_TC(tp, uvm_physseg_64MB);
+	ATF_TP_ADD_TC(tp, uvm_physseg_128MB);
+	ATF_TP_ADD_TC(tp, uvm_physseg_256MB);
+#endif /* UVM_HOTPLUG */
+
+	return atf_no_error();
+}