| /* Test the implementation of __ppc_set_ppr_* functions. |
| Copyright (C) 2017-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <inttypes.h> |
| #include <stdio.h> |
| #include <stdint.h> |
| #include <sys/auxv.h> |
| |
| #include <sys/platform/ppc.h> |
| |
| #include <support/test-driver.h> |
| |
| #ifdef __powerpc64__ |
| typedef uint64_t ppr_t; |
| # define MFPPR "mfppr" |
| /* The thread priority value is obtained from bits 11:13. */ |
| # define EXTRACT_THREAD_PRIORITY(x) ((x >> 50) & 7) |
| #else |
| typedef uint32_t ppr_t; |
| # define MFPPR "mfppr32" |
| /* For 32-bit, the upper 32 bits of the Program Priority Register (PPR) |
| are used, so the thread priority value is obtained from bits 43:46. */ |
| # define EXTRACT_THREAD_PRIORITY(x) ((x >> 18) & 7) |
| #endif /* !__powerpc64__ */ |
| |
| /* Read the thread priority value set in the PPR. */ |
| static __inline__ ppr_t |
| get_thread_priority (void) |
| { |
| /* Read the PPR. */ |
| ppr_t ppr; |
| #if defined __clang__ |
| /* Temporary until clang knows about mfppr. */ |
| asm volatile ("mfspr %0,896" : "=r"(ppr)); |
| #else |
| asm volatile (MFPPR" %0" : "=r"(ppr)); |
| #endif |
| /* Return the thread priority value. */ |
| return EXTRACT_THREAD_PRIORITY (ppr); |
| } |
| |
| /* Check the thread priority bits of PPR are set as expected. */ |
| uint8_t |
| check_thread_priority (uint8_t expected) |
| { |
| ppr_t actual = get_thread_priority (); |
| |
| if (actual != expected) |
| { |
| printf ("FAIL: Expected %"PRIu8" got %"PRIuMAX".\n", expected, |
| (uintmax_t) actual); |
| return 1; |
| } |
| printf ("PASS: Thread priority set to %"PRIu8" correctly.\n", expected); |
| return 0; |
| } |
| |
| /* The Power ISA 2.06 allows the following thread priorities for any |
| problem state program: low (2), medium low (3), and medium (4). |
| Power ISA 2.07b added very low (1). |
| Check whether the values set by __ppc_set_ppr_* are correct. */ |
| static int |
| do_test (void) |
| { |
| /* Check for the minimum required Power ISA to run these tests. */ |
| if ((getauxval (AT_HWCAP) & PPC_FEATURE_ARCH_2_06) == 0) |
| { |
| printf ("Requires an environment that implements the Power ISA version" |
| " 2.06 or greater.\n"); |
| return EXIT_UNSUPPORTED; |
| } |
| |
| uint8_t rc = 0; |
| |
| #ifdef _ARCH_PWR8 |
| __ppc_set_ppr_very_low (); |
| rc |= check_thread_priority (1); |
| #endif /* _ARCH_PWR8 */ |
| |
| __ppc_set_ppr_low (); |
| rc |= check_thread_priority (2); |
| |
| __ppc_set_ppr_med_low (); |
| rc |= check_thread_priority (3); |
| |
| __ppc_set_ppr_med (); |
| rc |= check_thread_priority (4); |
| |
| return rc; |
| } |
| |
| #include <support/test-driver.c> |