40 lines
2.3 KiB
ArmAsm
40 lines
2.3 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 tw=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/nexgen32e/x86feature.h"
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#include "libc/macros.h"
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/ Returns timestamp without needing system calls.
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/
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/ @return seconds since unix epoch in %st0
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/ @note uses microsecond scale fallback on k8 or vm
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.initbss 202,_init_nowl
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nowl: .quad 0
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.endobj nowl,globl
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.previous
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.init.start 202,_init_nowl
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ezlea nowl$sys,ax
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ezlea nowl$art,cx
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testb X86_HAVE(INVTSC)+kCpuids(%rip)
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cmovnz %rcx,%rax
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stosq
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.init.end 202,_init_nowl
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.source __FILE__
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