mirror of
https://github.com/samsonjs/sectorlisp.git
synced 2026-03-25 09:05:48 +00:00
45 lines
2.5 KiB
ArmAsm
45 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. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
.section .start,"ax",@progbits
|
|
.globl _start
|
|
.code16
|
|
|
|
_start: jmp 1f # some bios scan for short jump
|
|
1: ljmp $0x600>>4,$_begin # end of bios data roundup page
|
|
|
|
_begin: push %cs # memory model cs=ds=es = 0x600
|
|
pop %ds
|
|
push %cs
|
|
pop %es
|
|
mov $0x70000>>4,%ax # last 64k of first 480k memory
|
|
cli # create stack in higher memory
|
|
mov %ax,%ss # carefully avoids i8086 errata
|
|
xor %sp,%sp
|
|
sti
|
|
cld
|
|
xor %ax,%ax
|
|
xor %di,%di
|
|
mov $0x7c00-0x600,%cx
|
|
rep stosb # clears our bss memory
|
|
xchg %di,%bx # start buffer at 07c00
|
|
inc %cx # start at first sector
|
|
xor %dh,%dh # drive dl head zero
|
|
mov $0x0200+v_sectors,%ax # read sectors
|
|
int $0x13 # disk service
|
|
jmp main
|