amiga_boottest
view src/boot/boot.s @ 2:58ebd84822e7
it works
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Thu, 22 Feb 2018 12:44:20 +0200 |
| parents | 48093e4bd99a |
| children |
line source
1 | vi:filetype=gas68k:
2 .equ CMD_READ, 2
3 .equ EXEC_DO_IO, -0x1c8
4 .equ LOADADDR, 0x10000
6 start:
7 | starting with trackdisk device I/O request pointer in a1
8 | load the program at 0x100 and jump there
9 | program length is patched by mk_adf just before start
10 move.l -6(%pc), %d0 | get program size
11 move.w #0x080, 0xdff180
12 move.l %d0, 0x24(%a1) | I/O length
13 move.l #LOADADDR, 0x28(%a1) | I/O data pointer
14 move.l #512, 0x2c(%a1) | I/O offset (skip first sector)
15 move.w #CMD_READ, 0x1c(%a1) | I/O command
16 jsr EXEC_DO_IO(%a6)
17 move.w #0xf0f, 0xdff180
19 jmp LOADADDR
20 .align 4