71 lines
1.7 KiB
NASM
71 lines
1.7 KiB
NASM
; DMGTRIS
|
|
; Copyright (C) 2023 - Randy Thiemann <randy.thiemann@gmail.com>
|
|
|
|
; This program is free software: you can redistribute it and/or modify
|
|
; it under the terms of the GNU General Public License as published by
|
|
; the Free Software Foundation, either version 3 of the License, or
|
|
; (at your option) any later version.
|
|
|
|
; This program is distributed in the hope that it will be useful,
|
|
; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
; GNU General Public License for more details.
|
|
|
|
; You should have received a copy of the GNU General Public License
|
|
; along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
|
|
IF !DEF(BANKING_ASM)
|
|
DEF BANKING_ASM EQU 1
|
|
|
|
|
|
INCLUDE "globals.asm"
|
|
|
|
|
|
SECTION "Banking Variables", WRAM0
|
|
wBankBackup: ds 4
|
|
|
|
|
|
SECTION "Banking Functions", ROM0
|
|
BankingInit::
|
|
ld a, BANK_OTHER
|
|
ld [wBankBackup], a
|
|
ld [wBankBackup+1], a
|
|
ld [wBankBackup+2], a
|
|
ld [wBankBackup+3], a
|
|
ret
|
|
|
|
|
|
SECTION "Switch Bank", ROM0[$08]
|
|
; Pushes the current bank to the stach, switches to bank in B.
|
|
RSTSwitchBank::
|
|
ld a, [wBankBackup+2]
|
|
ld [wBankBackup+3], a
|
|
ld a, [wBankBackup+1]
|
|
ld [wBankBackup+2], a
|
|
ld a, [wBankBackup+0]
|
|
ld [wBankBackup+1], a
|
|
ld a, [rBANKID]
|
|
ld [wBankBackup+0], a
|
|
ld a, b
|
|
ld [rROMB0], a
|
|
ret
|
|
|
|
SECTION "Restore Bank", ROM0[$28]
|
|
; Pops a bank from the stack and switches to it.
|
|
RSTRestoreBank::
|
|
ld a, [wBankBackup+0]
|
|
ld b, a
|
|
ld a, [wBankBackup+1]
|
|
ld [wBankBackup+0], a
|
|
ld a, [wBankBackup+2]
|
|
ld [wBankBackup+1], a
|
|
ld a, [wBankBackup+3]
|
|
ld [wBankBackup+2], a
|
|
ld a, b
|
|
ld [rROMB0], a
|
|
ret
|
|
|
|
|
|
ENDC
|