FreeBSD/sys/arm/arm/pmap-v4.c
/*
 *	pmap_zero_page_area zeros the specified hardware page by mapping
 *	the page into KVM and using bzero to clear its contents.
 *
 *	off and size may not cover an area beyond a single hardware page.
 */
pmap_zero_page_area zeros the specified hardware page by mapping
the page into KVM and using bzero to clear its contents.

off and size may not cover an area beyond a single hardware page.
pmap_zero_page_area zeros the specified hardware page by mapping the page into KVM and using bzero to clear its contents . off and size may not cover an area beyond a single hardware page .
void
pmap_zero_page_area(vm_page_t m, int off, int size)
{
	pmap_zero_page_func(VM_PAGE_TO_PHYS(m), off, size);
}
void pmap_zero_page_area ( vm_page_t m , int off , int size ) { pmap_zero_page_func ( VM_PAGE_TO_PHYS ( m ) , off , size ) ; }
pmap_zero_page_area zeros the specified hardware page by mapping
      the page into KVM and using bzero to clear its contents.
pmap_zero_page_area zeros the specified hardware page by mapping the page into KVM and using bzero to clear its contents .