1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/boot/boot.s	Wed Feb 21 12:00:13 2018 +0200
     1.3 @@ -0,0 +1,24 @@
     1.4 +| vi:filetype=gas68k:
     1.5 +
     1.6 +	.equ CMD_READ, 2
     1.7 +
     1.8 +	.equ EXEC_DO_IO, -0x1c8
     1.9 +
    1.10 +| starting with trackdisk device I/O request pointer in a1
    1.11 +| load the program at 0x100 and return with that value in a0
    1.12 +| program length is patched by mk_adf at start - 4
    1.13 +start:
    1.14 +	move.l #0x100, 0x28(%a1)	| I/O data pointer
    1.15 +	move.l start - 4, 0x24(%a1)	| I/O length (1 sector for now)
    1.16 +	move.l #512, 0x2c(%a1)		| I/O offset (skip first sector)
    1.17 +	move.w #CMD_READ, 0x1c(%a1)	| I/O command
    1.18 +	move.l %a1, -(%sp)
    1.19 +	jsr EXEC_DO_IO(%a6)
    1.20 +	move.l (%sp)+, %a1
    1.21 +	move.b 0x1f(%a1), %d0
    1.22 +
    1.23 +	move.l #0x100, %a0
    1.24 +	rts
    1.25 +
    1.26 +	.ascii "bootblock_end"
    1.27 +	.align 4