Function disable_wp

freebsd/x86/x86/cpu_machdep.c:1432–1442

* Enable and restore kernel text write permissions. * Callers must ensure that disable_wp()/restore_wp() are executed * without rescheduling on the same core. */

 * without rescheduling on the same core.
 */
bool
disable_wp(void)
{
	u_int cr0;

	cr0 = rcr0();
	if ((cr0 & CR0_WP) == 0)
		return (false);
	load_cr0(cr0 & ~CR0_WP);
	return (true);
}

void
restore_wp(bool old_wp)