gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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gbdk-lib/libc/targets/sm83/far_ptr.s
1 ;--------------------------------------------------------------------------
2 ; far_ptr.s
3 ;
4 ; Copyright (C) 2020, Tony Pavlov
5 ;
6 ; This library is free software; you can redistribute it and/or modify it
7 ; under the terms of the GNU General Public License as published by the
8 ; Free Software Foundation; either version 2, or (at your option) any
9 ; later version.
10 ;
11 ; This library is distributed in the hope that it will be useful,
12 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ; GNU General Public License for more details.
15 ;
16 ; You should have received a copy of the GNU General Public License
17 ; along with this library; see the file COPYING. If not, write to the
18 ; Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
19 ; MA 02110-1301, USA.
20 ;
21 ; As a special exception, if you link this library with other files,
22 ; some of which are compiled with SDCC, to produce an executable,
23 ; this library does not by itself cause the resulting executable to
24 ; be covered by the GNU General Public License. This exception does
25 ; not however invalidate any other reasons why the executable file
26 ; might be covered by the GNU General Public License.
27 ;--------------------------------------------------------------------------
28
29 .module far_ptr
30
31 .include "global.s"
32
33 .area _HOME
34
35 ___call__banked::
36 ldh A, (#__current_bank)
37 push AF
38 ld HL, #1$
39 push HL
40 ld HL, #___call_banked_addr
41 ld A, (HL+)
42 ld H, (HL)
43 ld L, A
44 ld A, (#___call_banked_bank)
45 ldh (#__current_bank), A
46 ld (rROMB0),A
47 jp (HL)
48 1$:
49 pop AF
50 ldh (#__current_bank), A
51 ld (rROMB0), A
52 ret
53
54 _to_far_ptr::
55 ld a, c
56 ld c, e
57 ld e, a
58 ld a, b
59 ld b, d
60 ld d, a
61 ret
62
63 .area _DATA
64
65 ___call_banked_ptr::
66 ___call_banked_addr::
67 .ds 0x02 ; far pointer offset
68 ___call_banked_bank::
69 .ds 0x02 ; far pointer segment
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