| 1 | // SPDX-License-Identifier: GPL-2.0-only |
|---|---|
| 2 | /* |
| 3 | * Copyright 2014, Michael Ellerman, IBM Corp. |
| 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 | */ |
| 16 | int 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 | |
| 37 | int main(void) |
| 38 | { |
| 39 | return test_harness(reg_access, "reg_access"); |
| 40 | } |
| 41 |