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 
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 
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 
58 int main(int argc, char *argv[])
59 {
60 	return test_harness(dscr_user, "dscr_user_test");
61 }
62