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68 lines
1.7 KiB
ArmAsm
68 lines
1.7 KiB
ArmAsm
/* CPU strand yielding for busy loops.
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Copyright (C) 2012-2013 Free Software Foundation, Inc.
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Contributed by David S. Miller (davem@davemloft.net)
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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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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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.text
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__cpu_relax_generic:
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rd %ccr, %g0
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rd %ccr, %g0
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rd %ccr, %g0
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retl
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nop
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.size __cpu_relax_generic,.-__cpu_relax_generic
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__cpu_relax_pause:
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wr %g0, 128, %asr27
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retl
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nop
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.size __cpu_relax_pause,.-__cpu_relax_pause
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ENTRY(__cpu_relax)
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.type __cpu_relax, @gnu_indirect_function
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# ifdef SHARED
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SETUP_PIC_REG_LEAF(o3, o5)
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# endif
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set HWCAP_SPARC_PAUSE, %o1
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andcc %o0, %o1, %g0
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be 1f
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nop
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# ifdef SHARED
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sethi %gdop_hix22(__cpu_relax_pause), %o1
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xor %o1, %gdop_lox10(__cpu_relax_pause), %o1
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# else
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set __cpu_relax_pause, %o1
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# endif
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ba 10f
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nop
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1:
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# ifdef SHARED
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sethi %gdop_hix22(__cpu_relax_generic), %o1
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xor %o1, %gdop_lox10(__cpu_relax_generic), %o1
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# else
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set __cpu_relax_generic, %o1
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# endif
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10:
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# ifdef SHARED
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add %o3, %o1, %o1
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# endif
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retl
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mov %o1, %o0
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END(__cpu_relax)
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