mirror of
https://github.com/samsonjs/sectorlisp.git
synced 2026-03-25 09:05:48 +00:00
48 lines
2.5 KiB
ArmAsm
48 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
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
|
||
.section .yoink
|
||
nopw main
|