65 lines
2.5 KiB
ArmAsm
65 lines
2.5 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/macros.h"
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/ Half size of level 3 cache in bytes.
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.initbss 202,_init_kHalfCache3
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kHalfCache3:
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.quad 0
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.endobj kHalfCache3,globl
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.previous
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.init.start 202,_init_kHalfCache3
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cmpl $3,kCpuids(%rip)
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jbe 3f
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xor %r8d,%r8d
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mov $4,%r8d
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1: mov %r8d,%eax
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mov %r8d,%ecx
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push %rbx
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cpuid
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mov %ebx,%r9d
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pop %rbx
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test $31,%al
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je 3f
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cmp $99,%al
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jne 2f
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mov %r9d,%eax
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mov %r9d,%edx
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inc %ecx
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shr $12,%r9d
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shr $22,%eax
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and $0x0fff,%edx
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and $0x03ff,%r9d
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inc %eax
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inc %edx
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imul %edx,%eax
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imul %ecx,%eax
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lea 1(%r9),%ecx
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imul %ecx,%eax
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jmp 4f
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2: inc %r8d
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jmp 1b
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3: mov $0x00400000,%eax
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4: shr %eax
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stosq
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.init.end 202,_init_kHalfCache3
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.source __FILE__
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