diff --git a/sys/kern/subr_physmem.c b/sys/kern/subr_physmem.c
index 5caff7da4f5..498ad2440f4 100644
--- a/sys/kern/subr_physmem.c
+++ b/sys/kern/subr_physmem.c
@@ -483,6 +483,20 @@ physmem_avail(vm_paddr_t *avail, size_t maxavail)
 	return (regions_to_avail(avail, EXFLAG_NOALLOC, maxavail, 0, NULL, NULL));
 }
 
+bool
+physmem_excluded(vm_paddr_t pa, vm_size_t sz)
+{
+	const struct region *exp;
+	size_t exi;
+
+	for (exi = 0, exp = exregions; exi < excnt; ++exi, ++exp) {
+		if (pa < exp->addr || pa + sz > exp->addr + exp->size)
+			continue;
+		return (true);
+	}
+	return (false);
+}
+
 #ifdef _KERNEL
 /*
  * Process all the regions added earlier into the global avail lists.
diff --git a/sys/sys/physmem.h b/sys/sys/physmem.h
index f9ba69228c9..dcf12b589d0 100644
--- a/sys/sys/physmem.h
+++ b/sys/sys/physmem.h
@@ -54,6 +54,7 @@ void physmem_exclude_region(vm_paddr_t pa, vm_size_t sz, uint32_t flags);
 size_t physmem_avail(vm_paddr_t *avail, size_t maxavail);
 void physmem_init_kernel_globals(void);
 void physmem_print_tables(void);
+bool physmem_excluded(vm_paddr_t pa, vm_size_t sz);
 
 /*
  * Convenience routines for FDT.