41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
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/* CPU strand yielding for busy loops. Linux/sparc version.
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Copyright (C) 2017-2022 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 <sparc-ifunc.h>
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#ifdef __sparc_v9__
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static void
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__cpu_relax_generic (void)
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{
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asm volatile ("rd %ccr, %g0;"
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"rd %ccr, %g0;"
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"rd %ccr, %g0");
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}
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static void
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__cpu_relax_pause (void)
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{
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asm volatile ("wr %g0, 128, %asr27");
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}
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sparc_libc_ifunc (__cpu_relax,
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hwcap & HWCAP_SPARC_PAUSE
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? __cpu_relax_pause
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: __cpu_relax_generic)
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#endif
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