| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright 2014, Michael Ellerman, IBM Corp. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| |
| #include "ebb.h" |
| |
| |
| /* |
| * Test basic access to the EBB regs, they should be user accessible with no |
| * kernel interaction required. |
| */ |
| int reg_access(void) |
| { |
| uint64_t val, expected; |
| |
| SKIP_IF(!ebb_is_supported()); |
| |
| expected = 0x8000000100000000ull; |
| mtspr(SPRN_BESCR, expected); |
| val = mfspr(SPRN_BESCR); |
| |
| FAIL_IF(val != expected); |
| |
| expected = 0x0000000001000000ull; |
| mtspr(SPRN_EBBHR, expected); |
| val = mfspr(SPRN_EBBHR); |
| |
| FAIL_IF(val != expected); |
| |
| return 0; |
| } |
| |
| int main(void) |
| { |
| return test_harness(reg_access, "reg_access"); |
| } |
