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104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* Test the implementation of __ppc_set_ppr_* functions.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/auxv.h>
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#include <sys/platform/ppc.h>
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#include <support/test-driver.h>
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#ifdef __powerpc64__
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typedef uint64_t ppr_t;
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# define MFPPR "mfppr"
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/* The thread priority value is obtained from bits 11:13. */
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# define EXTRACT_THREAD_PRIORITY(x) ((x >> 50) & 7)
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#else
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typedef uint32_t ppr_t;
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# define MFPPR "mfppr32"
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/* For 32-bit, the upper 32 bits of the Program Priority Register (PPR)
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are used, so the thread priority value is obtained from bits 43:46. */
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# define EXTRACT_THREAD_PRIORITY(x) ((x >> 18) & 7)
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#endif /* !__powerpc64__ */
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/* Read the thread priority value set in the PPR. */
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static __inline__ ppr_t
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get_thread_priority (void)
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{
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/* Read the PPR. */
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ppr_t ppr;
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asm volatile (".machine push; .machine power7; "MFPPR" %0; .machine pop"
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: "=r"(ppr));
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/* Return the thread priority value. */
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return EXTRACT_THREAD_PRIORITY (ppr);
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}
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/* Check the thread priority bits of PPR are set as expected. */
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uint8_t
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check_thread_priority (uint8_t expected)
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{
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ppr_t actual = get_thread_priority ();
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if (actual != expected)
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{
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printf ("FAIL: Expected %"PRIu8" got %"PRIuMAX".\n", expected,
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(uintmax_t) actual);
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return 1;
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}
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printf ("PASS: Thread priority set to %"PRIu8" correctly.\n", expected);
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return 0;
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}
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/* The Power ISA 2.06 allows the following thread priorities for any
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problem state program: low (2), medium low (3), and medium (4).
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Power ISA 2.07b added very low (1).
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Check whether the values set by __ppc_set_ppr_* are correct. */
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static int
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do_test (void)
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{
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/* Check for the minimum required Power ISA to run these tests. */
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if ((getauxval (AT_HWCAP) & PPC_FEATURE_ARCH_2_06) == 0)
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{
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printf ("Requires an environment that implements the Power ISA version"
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" 2.06 or greater.\n");
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return EXIT_UNSUPPORTED;
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}
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uint8_t rc = 0;
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#ifdef _ARCH_PWR8
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__ppc_set_ppr_very_low ();
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rc |= check_thread_priority (1);
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#endif /* _ARCH_PWR8 */
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__ppc_set_ppr_low ();
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rc |= check_thread_priority (2);
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__ppc_set_ppr_med_low ();
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rc |= check_thread_priority (3);
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__ppc_set_ppr_med ();
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rc |= check_thread_priority (4);
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return rc;
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}
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#include <support/test-driver.c>
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