Index: sys/arm64/arm64/pmap.c
===================================================================
--- sys/arm64/arm64/pmap.c
+++ sys/arm64/arm64/pmap.c
@@ -244,6 +244,7 @@
 static void _pmap_unwire_l3(pmap_t pmap, vm_offset_t va, vm_page_t m,
     struct spglist *free);
 static int pmap_unuse_l3(pmap_t, vm_offset_t, pd_entry_t, struct spglist *);
+void pagezero(void *p);
 
 /*
  * These load the old table data and store the new value.
@@ -266,13 +267,6 @@
 	memcpy(d, s, PAGE_SIZE);
 }
 
-static __inline void
-pagezero(void *p)
-{
-
-	bzero(p, PAGE_SIZE);
-}
-
 #define	pmap_l1_index(va)	(((va) >> L1_SHIFT) & Ln_ADDR_MASK)
 #define	pmap_l2_index(va)	(((va) >> L2_SHIFT) & Ln_ADDR_MASK)
 #define	pmap_l3_index(va)	(((va) >> L3_SHIFT) & Ln_ADDR_MASK)
Index: sys/arm64/arm64/support.S
===================================================================
--- sys/arm64/arm64/support.S
+++ sys/arm64/arm64/support.S
@@ -33,6 +33,7 @@
 __FBSDID("$FreeBSD$");
 
 #include <machine/setjmp.h>
+#include <machine/param.h>
 
 #include "assym.s"
 
@@ -290,3 +291,33 @@
 	mov	x0, x1
 	ret
 END(longjmp)
+
+ENTRY(pagezero)
+	mov	x2, #(PAGE_SIZE - 1)
+	add	x0, x0, x2
+	mov	x2, #-1
+	lsl	x2, x2, #PAGE_SHIFT
+	and	x0, x0, x2
+	add	x1, x0, #PAGE_SIZE
+
+	ldr	x2, =dczva_line_size
+	ldr	x2, [x2]
+	cbz	x2, nondczva
+
+dczva:
+	dc	zva, x0
+	add	x0, x0, x2
+	cmp	x0, x1
+	b.ne	dczva
+	ret
+
+nondczva:
+	stp	xzr, xzr, [x0], #0x10
+	stp	xzr, xzr, [x0], #0x10
+	stp	xzr, xzr, [x0], #0x10
+	stp	xzr, xzr, [x0], #0x10
+	cmp	x0, x1
+	b.ne	nondczva
+	ret
+
+END(pagezero)