1 /*
2 * Copyright (c) 2014 Travis Geiselbrecht
3 *
4 * Use of this source code is governed by a MIT-style
5 * license that can be found in the LICENSE file or at
6 * https://opensource.org/licenses/MIT
7 */
8 #if ARM_WITH_CACHE
9
10 #include <stdbool.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <arch.h>
15 #include <arch/ops.h>
16 #include <lk/console_cmd.h>
17 #include <platform.h>
18
bench_cache(size_t bufsize,uint8_t * buf)19 static void bench_cache(size_t bufsize, uint8_t *buf) {
20 lk_bigtime_t t;
21 bool do_free;
22
23 if (buf == 0) {
24 buf = memalign(PAGE_SIZE, bufsize);
25 do_free = true;
26 } else {
27 do_free = false;
28 }
29
30 printf("buf %p, size %zu\n", buf, bufsize);
31
32 if (!buf)
33 return;
34
35 t = current_time_hires();
36 arch_clean_cache_range((addr_t)buf, bufsize);
37 t = current_time_hires() - t;
38
39 printf("took %llu usecs to clean %d bytes (cold)\n", t, bufsize);
40
41 memset(buf, 0x99, bufsize);
42
43 t = current_time_hires();
44 arch_clean_cache_range((addr_t)buf, bufsize);
45 t = current_time_hires() - t;
46
47 if (do_free)
48 free(buf);
49
50 printf("took %llu usecs to clean %d bytes (hot)\n", t, bufsize);
51 }
52
cache_tests(int argc,const console_cmd_args * argv)53 static int cache_tests(int argc, const console_cmd_args *argv) {
54 uint8_t *buf;
55 buf = (uint8_t *)((argc > 1) ? argv[1].u : 0UL);
56
57 printf("testing cache\n");
58
59 bench_cache(2*1024, buf);
60 bench_cache(64*1024, buf);
61 bench_cache(256*1024, buf);
62 bench_cache(1*1024*1024, buf);
63 bench_cache(8*1024*1024, buf);
64 return 0;
65 }
66
67 STATIC_COMMAND_START
68 STATIC_COMMAND("cache_tests", "test/bench the cpu cache", &cache_tests)
69 STATIC_COMMAND_END(cache_tests);
70
71 #endif
72