1 /*
2  * Copyright 2014, Michael Ellerman, IBM Corp.
3  * Licensed under GPLv2.
4  */
5 
6 #include <stdio.h>
7 #include <stdlib.h>
8 
9 #include "ebb.h"
10 #include "reg.h"
11 
12 
13 /*
14  * Test basic access to the EBB regs, they should be user accessible with no
15  * kernel interaction required.
16  */
17 int reg_access(void)
18 {
19 	uint64_t val, expected;
20 
21 	SKIP_IF(!ebb_is_supported());
22 
23 	expected = 0x8000000100000000ull;
24 	mtspr(SPRN_BESCR, expected);
25 	val = mfspr(SPRN_BESCR);
26 
27 	FAIL_IF(val != expected);
28 
29 	expected = 0x0000000001000000ull;
30 	mtspr(SPRN_EBBHR, expected);
31 	val = mfspr(SPRN_EBBHR);
32 
33 	FAIL_IF(val != expected);
34 
35 	return 0;
36 }
37 
38 int main(void)
39 {
40 	return test_harness(reg_access, "reg_access");
41 }
42