Function invltlb_glob

freebsd/amd64/include/cpufunc.h:503–518

* Perform the guaranteed invalidation of all TLB entries. This * includes the global entries, and entries in all PCIDs, not only the * current context. The function works both on non-PCID CPUs and CPUs * with the PCID turned off or on. See IA-32 SDM Vol. 3a 4.10.4.1 * Operations that Invalidate TLBs and Paging-Structure Caches. */

 * Operations that Invalidate TLBs and Paging-Structure Caches.
 */
static __inline void
invltlb_glob(void)
{
	uint64_t cr4;

	cr4 = rcr4();
	load_cr4(cr4 & ~CR4_PGE);
	/*
	 * Although preemption at this point could be detrimental to
	 * performance, it would not lead to an error.  PG_G is simply
	 * ignored if CR4.PGE is clear.  Moreover, in case this block
	 * is re-entered, the load_cr4() either above or below will
	 * modify CR4.PGE flushing the TLB.
	 */
	load_cr4(cr4 | CR4_PGE);
}

/*
 * TLB flush for an individual page (even if it has PG_G).