mirror of
https://github.com/Wiimpathy/HatariWii.git
synced 2024-11-29 13:04:15 +01:00
65 lines
1.4 KiB
ArmAsm
65 lines
1.4 KiB
ArmAsm
|
; nf_asmv.s - VBCC/Vasm NatFeats ASM detection code
|
||
|
|
;
|
||
|
|
; Copyright (c) 2014 by Eero Tamminen
|
||
|
|
;
|
||
|
|
; Mostly based on code from EmuTOS,
|
||
|
|
; Copyright (c) 2001-2013 by the EmuTOS development team
|
||
|
|
;
|
||
|
|
; This file is distributed under the GPL, version 2 or at your
|
||
|
|
; option any later version. See doc/license.txt for details.
|
||
|
|
|
||
|
|
;;
|
||
|
|
;; exported symbols
|
||
|
|
;;
|
||
|
|
PUBLIC _nf_id
|
||
|
|
PUBLIC _nf_call
|
||
|
|
PUBLIC _detect_nf
|
||
|
|
|
||
|
|
;;
|
||
|
|
;; variables
|
||
|
|
;;
|
||
|
|
DATA
|
||
|
|
|
||
|
|
nf_version:
|
||
|
|
dc.b "NF_VERSION\0"
|
||
|
|
even
|
||
|
|
|
||
|
|
;;
|
||
|
|
;; code
|
||
|
|
;;
|
||
|
|
TEXT
|
||
|
|
|
||
|
|
; NatFeats test
|
||
|
|
;
|
||
|
|
; Needs to be called from Supervisor mode,
|
||
|
|
; otherwise exception handler change bombs
|
||
|
|
_detect_nf:
|
||
|
|
clr.l d0 ; assume no NatFeats available
|
||
|
|
move.l sp, a1
|
||
|
|
move.l $10, a0 ; illegal vector
|
||
|
|
move.l #fail_nf, $10
|
||
|
|
pea nf_version
|
||
|
|
sub.l #4, sp
|
||
|
|
; Conflict with ColdFire instruction mvs.b d0,d1
|
||
|
|
dc.w $7300 ; Jump to NATFEAT_ID
|
||
|
|
tst.l d0
|
||
|
|
beq.s fail_nf
|
||
|
|
moveq #1, d0 ; NatFeats detected
|
||
|
|
|
||
|
|
fail_nf:
|
||
|
|
move.l a1, sp
|
||
|
|
move.l a0, $10 ; illegal vector
|
||
|
|
|
||
|
|
rts
|
||
|
|
|
||
|
|
|
||
|
|
; map native feature to its ID
|
||
|
|
_nf_id:
|
||
|
|
dc.w $7300 ; Conflict with ColdFire instruction mvs.b d0,d1
|
||
|
|
rts
|
||
|
|
|
||
|
|
; call native feature by its ID
|
||
|
|
_nf_call:
|
||
|
|
dc.w $7301 ; Conflict with ColdFire instruction mvs.b d1,d1
|
||
|
|
rts
|