1 // SPDX-License-Identifier: GPL-2.0-only
3 * POWER Data Stream Control Register (DSCR) SPR test
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
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.
16 * Copyright 2013, Anton Blanchard, IBM Corporation.
17 * Copyright 2015, Anshuman Khandual, IBM Corporation.
21 static int check_dscr(char *str)
23 unsigned long cur_dscr, cur_dscr_usr;
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);
41 for (i = 0; i < COUNT; i++) {
43 if (check_dscr("kernel"))
47 for (i = 0; i < COUNT; i++) {
49 if (check_dscr("user"))
55 int main(int argc, char *argv[])
57 return test_harness(dscr_user, "dscr_user_test");