1 /*
2 * Copyright (c) 2021, Google Inc. All rights reserved
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files
6 * (the "Software"), to deal in the Software without restriction,
7 * including without limitation the rights to use, copy, modify, merge,
8 * publish, distribute, sublicense, and/or sell copies of the Software,
9 * and to permit persons to whom the Software is furnished to do so,
10 * subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be
13 * included in all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
19 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
20 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
21 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 #pragma once
25
26 #include <arch/pan.h>
27 #include <sys/types.h>
28
29 status_t copy_from_anywhere(void *dest, vaddr_t src, size_t len);
30
31 int tag_for_addr_(vaddr_t addr);
32
tag_for_address(vaddr_t addr)33 static int tag_for_address(vaddr_t addr) {
34 status_t ret;
35 bool pan_enabled = arm64_pan_enabled();
36 if (pan_enabled) {
37 /* temporarily disable PAN so we can read tags */
38 arm64_disable_pan();
39 }
40 ret = tag_for_addr_(addr);
41 if (pan_enabled) {
42 arm64_enable_pan();
43 }
44 return ret;
45 }
46