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/* Test the implementation of __ppc_set_ppr_* functions.
Copyright (C) 2017-2024 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
<https://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;
asm volatile (".machine push; .machine power7; "MFPPR" %0; .machine pop"
: "=r"(ppr));
/* 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>
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