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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cc6a93f1 AK |
2 | /* |
3 | * POWER Data Stream Control Register (DSCR) SPR test | |
4 | * | |
5 | * This test modifies the DSCR value through both the SPR number | |
6 | * based mtspr instruction and then makes sure that the same is | |
7 | * reflected through mfspr instruction using either of the SPR | |
8 | * numbers. | |
9 | * | |
10 | * When using the privilege state SPR, the instructions such as | |
11 | * mfspr or mtspr are priviledged and the kernel emulates them | |
12 | * for us. Instructions using problem state SPR can be exuecuted | |
13 | * directly without any emulation if the HW supports them. Else | |
14 | * they also get emulated by the kernel. | |
15 | * | |
16 | * Copyright 2013, Anton Blanchard, IBM Corporation. | |
17 | * Copyright 2015, Anshuman Khandual, IBM Corporation. | |
cc6a93f1 AK |
18 | */ |
19 | #include "dscr.h" | |
20 | ||
21 | static int check_dscr(char *str) | |
22 | { | |
23 | unsigned long cur_dscr, cur_dscr_usr; | |
24 | ||
25 | cur_dscr = get_dscr(); | |
26 | cur_dscr_usr = get_dscr_usr(); | |
27 | if (cur_dscr != cur_dscr_usr) { | |
28 | printf("%s set, kernel get %lx != user get %lx\n", | |
29 | str, cur_dscr, cur_dscr_usr); | |
30 | return 1; | |
31 | } | |
32 | return 0; | |
33 | } | |
34 | ||
35 | int dscr_user(void) | |
36 | { | |
37 | int i; | |
38 | ||
39 | check_dscr(""); | |
40 | ||
41 | for (i = 0; i < COUNT; i++) { | |
42 | set_dscr(i); | |
43 | if (check_dscr("kernel")) | |
44 | return 1; | |
45 | } | |
46 | ||
47 | for (i = 0; i < COUNT; i++) { | |
48 | set_dscr_usr(i); | |
49 | if (check_dscr("user")) | |
50 | return 1; | |
51 | } | |
52 | return 0; | |
53 | } | |
54 | ||
55 | int main(int argc, char *argv[]) | |
56 | { | |
57 | return test_harness(dscr_user, "dscr_user_test"); | |
58 | } |