diff --git a/sys/amd64/include/param.h b/sys/amd64/include/param.h
--- a/sys/amd64/include/param.h
+++ b/sys/amd64/include/param.h
@@ -95,6 +95,8 @@
 #define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
 #define PAGE_SIZE	(1<<PAGE_SHIFT)	/* bytes/page */
 #define PAGE_MASK	(PAGE_SIZE-1)
+#define	PAGE_SIZE_MAX	PAGE_SIZE
+#define	PAGE_SHIFT_MAX	PAGE_SHIFT
 /* Size of the level 2 page directory units */
 #define	NPDEPG		(PAGE_SIZE/(sizeof (pd_entry_t)))
 #define	NPDEPGSHIFT	9		/* LOG2(NPDEPG) */
diff --git a/sys/arm/include/param.h b/sys/arm/include/param.h
--- a/sys/arm/include/param.h
+++ b/sys/arm/include/param.h
@@ -102,6 +102,8 @@
 #define	PAGE_SHIFT	12
 #define	PAGE_SIZE	(1 << PAGE_SHIFT)	/* Page size */
 #define	PAGE_MASK	(PAGE_SIZE - 1)
+#define	PAGE_SIZE_MAX	PAGE_SIZE
+#define	PAGE_SHIFT_MAX	PAGE_SHIFT
 
 #define PDR_SHIFT	20 /* log2(NBPDR) */
 #define NBPDR		(1 << PDR_SHIFT)
diff --git a/sys/arm64/include/param.h b/sys/arm64/include/param.h
--- a/sys/arm64/include/param.h
+++ b/sys/arm64/include/param.h
@@ -97,6 +97,9 @@
 #define	PAGE_SIZE	(1 << PAGE_SHIFT)
 #define	PAGE_MASK	(PAGE_SIZE - 1)
 
+#define	PAGE_SHIFT_MAX	PAGE_SHIFT_64K
+#define	PAGE_SIZE_MAX	PAGE_SIZE_64K
+
 #define	MAXPAGESIZES	3		/* maximum number of supported page sizes */
 
 #ifndef KSTACK_PAGES
diff --git a/sys/i386/include/param.h b/sys/i386/include/param.h
--- a/sys/i386/include/param.h
+++ b/sys/i386/include/param.h
@@ -85,6 +85,8 @@
 #define PAGE_SHIFT	12		/* LOG2(PAGE_SIZE) */
 #define PAGE_SIZE	(1 << PAGE_SHIFT)	/* bytes/page */
 #define PAGE_MASK	(PAGE_SIZE - 1)
+#define	PAGE_SIZE_MAX	PAGE_SIZE
+#define	PAGE_SHIFT_MAX	PAGE_SHIFT
 #define NPTEPG		(PAGE_SIZE / sizeof(pt_entry_t))
 
 /* Size in bytes of the page directory */
diff --git a/sys/powerpc/include/param.h b/sys/powerpc/include/param.h
--- a/sys/powerpc/include/param.h
+++ b/sys/powerpc/include/param.h
@@ -106,6 +106,8 @@
 #define	PAGE_SHIFT	12
 #define	PAGE_SIZE	(1 << PAGE_SHIFT)	/* Page size */
 #define	PAGE_MASK	(PAGE_SIZE - 1)
+#define	PAGE_SIZE_MAX	PAGE_SIZE
+#define	PAGE_SHIFT_MAX	PAGE_SHIFT
 #define	NPTEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
 #define	NPDEPG		(PAGE_SIZE/(sizeof (pt_entry_t)))
 
diff --git a/sys/riscv/include/param.h b/sys/riscv/include/param.h
--- a/sys/riscv/include/param.h
+++ b/sys/riscv/include/param.h
@@ -80,6 +80,8 @@
 #define	PAGE_SHIFT	12
 #define	PAGE_SIZE	(1 << PAGE_SHIFT)	/* Page size */
 #define	PAGE_MASK	(PAGE_SIZE - 1)
+#define	PAGE_SIZE_MAX	PAGE_SIZE
+#define	PAGE_SHIFT_MAX	PAGE_SHIFT
 
 #define	MAXPAGESIZES	3	/* maximum number of supported page sizes */