Function pmap_pkru_check_uargs

freebsd/amd64/amd64/pmap.c:11081–11094

}

static int
pmap_pkru_check_uargs(pmap_t pmap, vm_offset_t sva, vm_offset_t eva,
    u_int keyidx, int flags)
{

	if (pmap->pm_type != PT_X86 || keyidx > PMAP_MAX_PKRU_IDX ||
	    (flags & ~(AMD64_PKRU_PERSIST | AMD64_PKRU_EXCL)) != 0)
		return (EINVAL);
	if (eva <= sva || eva > VM_MAXUSER_ADDRESS)
		return (EFAULT);
	if ((cpu_stdext_feature2 & CPUID_STDEXT2_PKU) == 0)
		return (ENOTSUP);
	return (0);
}

int
pmap_pkru_set(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, u_int keyidx,