LXR linux/tools/testing/selftests/powerpc/pmu/ebb/reg_access

   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
  11
  12/*
  13 * Test basic access to the EBB regs, they should be user accessible with no
  14 * kernel interaction required.
  15 */
  16int reg_access(void)
  17{
  18        uint64_t val, expected;
  19
  20        SKIP_IF(!ebb_is_supported());
  21
  22        expected = 0x8000000100000000ull;
  23        mtspr(SPRN_BESCR, expected);
  24        val = mfspr(SPRN_BESCR);
  25
  26        FAIL_IF(val != expected);
  27
  28        expected = 0x0000000001000000ull;
  29        mtspr(SPRN_EBBHR, expected);
  30        val = mfspr(SPRN_EBBHR);
  31
  32        FAIL_IF(val != expected);
  33
  34        return 0;
  35}
  36
  37int main(void)
  38{
  39        return test_harness(reg_access, "reg_access");
  40}
  41