1 /*
2 * Copyright (c) 2020 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28 #include <arm/pmap/pmap_internal.h>
29
30 /**
31 * Placeholder for random pmap functionality that doesn't fit into any of the
32 * other files. This will contain things like the CPU copy windows, ASID
33 * management and context switching code, and stage 2 pmaps (among others).
34 *
35 * My idea is that code that doesn't fit into any of the other files will live
36 * in this file until we deem it large and important enough to break into its
37 * own file.
38 */
39
40
41 void
pmap_abandon_measurement(void)42 pmap_abandon_measurement(void)
43 {
44 #if SCHED_HYGIENE_DEBUG && (DEVELOPMENT || DEBUG)
45 thread_t t = current_thread();
46
47 uint64_t istate = pmap_interrupts_disable();
48 pmap_pin_kernel_pages((vm_map_offset_t)&(t->machine), sizeof(t->machine));
49 if (t->machine.preemption_disable_mt != 0) {
50 t->machine.preemption_disable_abandon = true;
51 }
52 pmap_unpin_kernel_pages((vm_map_offset_t)&(t->machine), sizeof(t->machine));
53 pmap_interrupts_restore(istate);
54 #endif /* SCHED_HYGIENE_DEBUG && (DEVELOPMENT || DEBUG) */
55 }
56