-#define round_page(x) ((vm_offset_t)((((vm_offset_t)(x)) + page_mask) & ~page_mask))
-#define trunc_page(x) ((vm_offset_t)(((vm_offset_t)(x)) & ~page_mask))
-#else /* KERNEL */
-#define round_page(x) ((((vm_offset_t)(x) + (vm_page_size - 1)) / vm_page_size) * vm_page_size)
-#define trunc_page(x) ((((vm_offset_t)(x)) / vm_page_size) * vm_page_size)
-#endif /* KERNEL */
-
-#ifdef KERNEL
-extern vm_size_t page_size; /* machine independent page size */
-extern vm_size_t page_mask; /* page_size - 1; mask for
- offset within page */
-extern int page_shift; /* shift to use for page size */
-
-extern vm_size_t mem_size; /* size of physical memory (bytes) */