tools/testing/selftests/powerpc/pmu/ebb/reg_access_test.c

   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 }