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162 lines
2.1 KiB
162 lines
2.1 KiB
4 years ago
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include "hardware.inc"
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include "defines.inc"
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NULL equ 0
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global NULL
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section "home/start.asm@wram0", wram0
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ds $100 - 1
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w_stack:
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ds 1
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section "home/start.asm@hram", hram
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h_console:: db
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section "home/start.asm", rom0[$100]
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nop
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jp _start
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rept $150 - $104
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db 0
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endr
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_start:
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di
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; Attempt to detect console model
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cp $ff
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jr z, .console_mgb
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cp $11
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jr z, .console_cgb
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ld a, console_dmg
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jr .console_end
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.console_mgb
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ld a, console_mgb
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jr .console_end
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.console_cgb
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dec b
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jr z, .console_agb
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ld a, console_cgb
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jr .console_end
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.console_agb
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ld a, console_agb
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.console_end
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ldh [h_console], a
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xor a
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ldh [r_ie], a
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ldh [r_if], a
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if def(ENABLE_CLEAR)
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; Clear wram0
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ld hl, mmap_wram0
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ld bc, mmap_wram0_end - mmap_wram0
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call memset
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endc
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ld sp, w_stack
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ldh a, [h_console]
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push af
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if def(ENABLE_CLEAR)
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; Clear the hram and wram1
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xor a
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ld hl, mmap_hram
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ld bc, mmap_hram_end - mmap_hram
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call memset
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ld hl, mmap_wramx
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ld bc, mmap_wramx_end - mmap_wramx
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call memset
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endc
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pop af
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ldh [h_console], a
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if def(ENABLE_CGB) && def(ENABLE_CLEAR)
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; Clear the different wram banks
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cp console_cgb
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jr c, .end
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ld d, 8
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.cgb_loop
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dec d
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ld a, d
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ldh [r_svbk], a
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cp 2
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jr c, .end
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ld hl, mmap_wramx
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ld bc, mmap_wramx_end - mmap_wramx
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call memset
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jr .cgb_loop
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.end
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endc
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ei
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jp main
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_halt_::
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halt
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jr _halt_
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_stop_::
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; Save registers
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ldh a, [r_ie]
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ld b, a
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ldh a, [r_lcdc]
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ld c, a
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; Turn everything off
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xor a
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ldh [r_ie], a
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ldh [r_if], a
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ldh [r_joyp], a
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call lcd_vblank_wait
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xor a
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ldh [r_lcdc], a
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; Make sure the joypad doesn't inmediately trigger anything.
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ld d, $ff
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.wait
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ldh a, [r_joyp]
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cpl
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and r_joyp_data
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jr nz, .wait
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dec d
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jr nz, .wait
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stop
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; Restore registers
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ld a, c
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ldh [r_lcdc], a
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ld a, b
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ldh [r_ie], a
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ret
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_hl_::
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jp hl
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_bc_::
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push bc
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ret
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_de_::
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push de
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ret
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swap_hl_de::
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ld a, h
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ld h, d
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ld d, a
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ld a, l
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ld l, e
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ld e, a
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ret
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