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diff --git a/src/sys/include/vm/physseg.h b/src/sys/include/vm/physseg.h
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+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#ifndef _VM_PHYSSEG_H_
+#define _VM_PHYSSEG_H_ 1
+
+#include <sys/types.h>
+
+/*
+ * Represents physical memory stats gathered
+ * during initialization or during refresh.
+ */
+struct physmem_stat {
+    size_t pages_free;
+    size_t pages_used;
+};
+
+/*
+ * Initialize physical memory and get initial physical
+ * memory stats.
+ *
+ * @stat: Stats are written here
+ *
+ * Returns zero on success, otherwise a less than zero
+ * value on failure.
+ */
+int vm_seg_init(struct physmem_stat *stat);
+
+/*
+ * Allocate one or more physical frames and
+ * get the [physical] address.
+ *
+ * @count: Number of frames to allocate
+ *
+ * Returns zero on failure (e.g., out of memory)
+ */
+uintptr_t vm_alloc_frame(size_t count);
+
+/*
+ * Free one or more physical frames
+ *
+ * @base: Base address to start freeing at
+ * @count: Number of frames to free
+ */
+void vm_free_frame(uintptr_t base, size_t count);
+
+#endif  /* !_VM_PHYSSEG_H_ */