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