cosmopolitan/ape/lib/kbiosdataarea.S

46 lines
2.5 KiB
ArmAsm

/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
*/
#include "ape/lib/pc.h"
#include "ape/config.h"
#include "ape/macros.internal.h"
#include "ape/notice.inc"
.section .real,"ax",@progbits
.source __FILE__
.code16
.globl kBiosDataArea
.hidden kBiosDataArea
.type kBiosDataArea,@object
.size kBiosDataArea,XLM_BIOS_DATA_AREA_SIZE
kBiosDataArea = ape.xlm + XLM_BIOS_DATA_AREA
.globl kBiosDataAreaXlm
.hidden kBiosDataAreaXlm
.type kBiosDataAreaXlm,@object
.size kBiosDataAreaXlm,XLM_BIOS_DATA_AREA_SIZE
kBiosDataAreaXlm = XLM(BIOS_DATA_AREA)
.section .sort.text.real.init.2.kBiosDataArea,"ax",@progbits
movpp %ds,%es # copy bios data to valid page
mov $PC_BIOS_DATA_AREA,%si
mov $XLM(BIOS_DATA_AREA),%di
mov $XLM_BIOS_DATA_AREA_SIZE,%cx
rep movsb
.previous