blob: e04a127f3f5203690e5d5fe30af197bda30a547f (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
@ Copyright 2022 Gabriel Jensen.
@ This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
@ If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
.syntax unified
.cpu arm7tdmi
.thumb
.globl __agbx_getvbnk
.globl agbx_getvbnk
.func
.thumb_func
agbx_getvbnk:
@ Get the current value of dispcnt:
ldr r0,.dispcntaddr
ldrh r1,[r0]
@ Get the address:
b __agbx_getvbnk
bx lr
.endfunc
.func
.thumb_func
__agbx_getvbnk: @ Takes the value of dispcnt in r1.
@ Check if the fifth bit is set:
movs r0,0b10000
tst r1,r0
bne .vbnk1
.vbnk0:
@ Return the address of the first video bank:
ldr r0,.vbnk0addr
bx lr
.vbnk1:
@ Return the address of the second video bank:
ldr r0,.vbnk1addr
bx lr
.endfunc
.align
.dispcntaddr:
.long 0x4000000
.align
.vbnk0addr:
.long 0x6000000
.align
.vbnk1addr:
.long 0x600A000
|
