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//! This module roughly corresponds to `mach/vm_page_size.h`
use vm_types::{mach_vm_offset_t, mach_vm_size_t, vm_size_t};
extern "C" {
pub static vm_page_size: vm_size_t;
pub static vm_page_mask: vm_size_t;
pub static vm_page_shift: ::libc::c_int;
}
pub unsafe fn mach_vm_trunc_page(x: mach_vm_offset_t) -> mach_vm_offset_t {
(x & !(vm_page_mask as mach_vm_size_t))
}
pub unsafe fn mach_vm_round_page(x: mach_vm_offset_t) -> mach_vm_offset_t {
((x + vm_page_mask as mach_vm_size_t) & !(vm_page_mask as mach_vm_size_t))
}
#[cfg(test)]
mod tests {
use vm_page_size::*;
use vm_types::mach_vm_size_t;
#[test]
fn page_size() {
unsafe {
assert!(vm_page_size > 0);
assert!(vm_page_size % 2 == 0);
assert_eq!(mach_vm_round_page(1), vm_page_size as mach_vm_size_t);
assert_eq!(vm_page_size, 4096);
}
}
}