amiga_boottest
view src/boot/boot.s @ 1:48093e4bd99a
stuff
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Wed, 21 Feb 2018 18:00:45 +0200 |
| parents | 51422ea54b9d |
| children | 58ebd84822e7 |
line source
1 | vi:filetype=gas68k:
2 .equ CMD_READ, 2
4 .equ EXEC_DO_IO, -0x1c8
6 | starting with trackdisk device I/O request pointer in a1
7 | load the program at 0x100 and jump there
8 | program length is patched by mk_adf just before start
9 start:
10 move.l -6(%pc), %d0 | get binary size
11 move.l %d0, 0x24(%a1) | I/O length
12 move.l #0x100, 0x28(%a1) | I/O data pointer
13 move.l #512, 0x2c(%a1) | I/O offset (skip first sector)
14 move.w #CMD_READ, 0x1c(%a1) | I/O command
15 move.l %a1, -(%sp)
16 jsr EXEC_DO_IO(%a6)
17 move.l (%sp)+, %a1
19 bra 0x100
20 .align 4