39 lines
2.2 KiB
ArmAsm
39 lines
2.2 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ 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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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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/ Stores CPU Timestamp Counter at startup.
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/ It can be useful as an added source of seeding information.
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/ @note rdtsc is a 25 cycle instruction
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.initbss 200,_init_kStartTsc
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kStartTsc:
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.quad 0
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.endobj kStartTsc,globl
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.previous
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.init.start 200,_init_kStartTsc
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rdtsc
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stosl
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xchg %edx,%eax
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stosl
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.init.end 200,_init_kStartTsc
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.source __FILE__
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