1 /*
2 * POWER Data Stream Control Register (DSCR) SPR test
3 *
4 * This test modifies the DSCR value through both the SPR number
5 * based mtspr instruction and then makes sure that the same is
6 * reflected through mfspr instruction using either of the SPR
7 * numbers.
8 *
9 * When using the privilege state SPR, the instructions such as
10 * mfspr or mtspr are priviledged and the kernel emulates them
11 * for us. Instructions using problem state SPR can be exuecuted
12 * directly without any emulation if the HW supports them. Else
13 * they also get emulated by the kernel.
14 *
15 * Copyright 2013, Anton Blanchard, IBM Corporation.
16 * Copyright 2015, Anshuman Khandual, IBM Corporation.
17 *
18 * This program is free software; you can redistribute it and/or modify it
19 * under the terms of the GNU General Public License version 2 as published
20 * by the Free Software Foundation.
21 */
22 #include "dscr.h"
23
check_dscr(char * str)24 static int check_dscr(char *str)
25 {
26 unsigned long cur_dscr, cur_dscr_usr;
27
28 cur_dscr = get_dscr();
29 cur_dscr_usr = get_dscr_usr();
30 if (cur_dscr != cur_dscr_usr) {
31 printf("%s set, kernel get %lx != user get %lx\n",
32 str, cur_dscr, cur_dscr_usr);
33 return 1;
34 }
35 return 0;
36 }
37
dscr_user(void)38 int dscr_user(void)
39 {
40 int i;
41
42 check_dscr("");
43
44 for (i = 0; i < COUNT; i++) {
45 set_dscr(i);
46 if (check_dscr("kernel"))
47 return 1;
48 }
49
50 for (i = 0; i < COUNT; i++) {
51 set_dscr_usr(i);
52 if (check_dscr("user"))
53 return 1;
54 }
55 return 0;
56 }
57
main(int argc,char * argv[])58 int main(int argc, char *argv[])
59 {
60 return test_harness(dscr_user, "dscr_user_test");
61 }
62