mirror of
https://github.com/jart/cosmopolitan.git
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2d80bbc802
blinkenlights now does a pretty good job emulating what happens when binaries boot from BIOS into long mode. So it's been much easier to debug the bare metal process and wrinkle out many issues.
46 lines
2.6 KiB
ArmAsm
46 lines
2.6 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 "ape/lib/pc.h"
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#include "ape/config.h"
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#include "ape/macros.h"
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#include "ape/notice.inc"
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.section .real,"ax",@progbits
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.source __FILE__
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.code16
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.globl kBiosDataArea
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.hidden kBiosDataArea
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.type kBiosDataArea,@object
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.size kBiosDataArea,XLM_BIOS_DATA_AREA_SIZE
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kBiosDataArea = ape.xlm + XLM_BIOS_DATA_AREA
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.globl kBiosDataAreaXlm
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.hidden kBiosDataAreaXlm
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.type kBiosDataAreaXlm,@object
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.size kBiosDataAreaXlm,XLM_BIOS_DATA_AREA_SIZE
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kBiosDataAreaXlm = XLM(BIOS_DATA_AREA)
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.section .sort.text.real.init.2.kBiosDataArea,"ax",@progbits
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movpp %ds,%es # copy bios data to valid page
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mov $PC_BIOS_DATA_AREA,%si
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mov $XLM(BIOS_DATA_AREA),%di
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mov $XLM_BIOS_DATA_AREA_SIZE,%cx
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rep movsb
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.previous
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