fox32rom/main.asm

309 lines
7.9 KiB
NASM
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; entry point
; fox32 starts here on reset
org 0xF0000000
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const FOX32ROM_VERSION_MAJOR: 0
const FOX32ROM_VERSION_MINOR: 3
const FOX32ROM_VERSION_PATCH: 2
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const SYSTEM_STACK: 0x01FFF800
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const BACKGROUND_COLOR: 0xFF674764
const TEXT_COLOR: 0xFFFFFFFF
; initialization code
entry:
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mov rsp, SYSTEM_STACK
; disable audio playback
mov r0, 0x80000600
out r0, 0
; seed the random number generator
entry_seed:
mov [0x000003FC], entry_seed_done
ise
mov r0, 2166136261
entry_seed_loop:
mul r0, 16777619
rjmp entry_seed_loop
entry_seed_done:
mov [RANDOM_STATE], r0
; set the stach pointer again to pop the return address and flags off the stack
mov rsp, SYSTEM_STACK
; set the interrupt vector for interrupt 0xFF - vsync
mov [0x000003FC], system_vsync_handler
ise
; clear the interrupt vector for interrupt 0xFE - audio buffer switch
mov [0x000003F8], 0x00000000
; disable all overlays
mov r31, 0x1F
mov r0, 0x80000300
disable_all_overlays_loop:
out r0, 0
inc r0
loop disable_all_overlays_loop
call enable_cursor
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mov r0, BACKGROUND_COLOR
call fill_background
call enable_menu_bar
call clear_menu_bar
mov r0, menu_items_root
mov r1, 0xFFFFFFFF
call draw_menu_bar_root_items
draw_startup_text:
mov r0, startup_str
mov r1, 16
mov r2, 464
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mov r3, TEXT_COLOR
mov r4, 0x00000000
mov r10, FOX32ROM_VERSION_MAJOR
mov r11, FOX32ROM_VERSION_MINOR
mov r12, FOX32ROM_VERSION_PATCH
call draw_format_str_to_background
event_loop:
call get_next_event
; was the mouse clicked?
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cmp r0, EVENT_TYPE_MOUSE_CLICK
;ifz call mouse_click_event
; was the mouse released?
cmp r0, EVENT_TYPE_MOUSE_RELEASE
;ifz call mouse_release_event
; did the user click the menu bar?
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cmp r0, EVENT_TYPE_MENU_BAR_CLICK
ifz mov r0, menu_items_root
ifz call menu_bar_click_event
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; is the user in a menu?
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cmp r0, EVENT_TYPE_MENU_UPDATE
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ifz call menu_update_event
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; did the user click a menu item?
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cmp r0, EVENT_TYPE_MENU_CLICK
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ifz call menu_click_event
; check if a disk is inserted as disk 0
; if port 0x8000100n returns a non-zero value, then a disk is inserted as disk n
in r0, 0x80001000
cmp r0, 0
ifnz call start_boot_process
jmp event_loop
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menu_click_event:
; r3 contains the clicked menu item
; insert disk
cmp r3, 0
ifz jmp insert_boot_disk
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; shutdown
cmp r3, 1
ifz icl
ifz halt
ret
insert_boot_disk:
mov r0, 0x80001000
out r0, 0
ret
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get_rom_version:
mov r0, FOX32ROM_VERSION_MAJOR
mov r1, FOX32ROM_VERSION_MINOR
mov r2, FOX32ROM_VERSION_PATCH
ret
; code
#include "audio.asm"
#include "background.asm"
#include "boot.asm"
#include "cursor.asm"
#include "debug.asm"
#include "disk.asm"
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#include "draw_pixel.asm"
#include "draw_rectangle.asm"
#include "draw_text.asm"
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#include "draw_tile.asm"
#include "event.asm"
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#include "integer.asm"
#include "keyboard.asm"
#include "memory.asm"
#include "menu.asm"
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#include "menu_bar.asm"
#include "monitor/monitor.asm"
#include "mouse.asm"
#include "overlay.asm"
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#include "panic.asm"
#include "random.asm"
#include "ryfs.asm"
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#include "string.asm"
#include "vsync.asm"
; data
; system jump table
org.pad 0xF0040000
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data.32 get_rom_version
data.32 system_vsync_handler
data.32 get_mouse_position
data.32 new_event
data.32 wait_for_event
data.32 get_next_event
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data.32 panic
; generic drawing jump table
org.pad 0xF0041000
data.32 draw_str_generic
data.32 draw_format_str_generic
data.32 draw_decimal_generic
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data.32 draw_hex_generic
data.32 draw_font_tile_generic
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data.32 draw_tile_generic
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data.32 set_tilemap
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data.32 draw_pixel_generic
data.32 draw_filled_rectangle_generic
; background jump table
org.pad 0xF0042000
data.32 fill_background
data.32 draw_str_to_background
data.32 draw_format_str_to_background
data.32 draw_decimal_to_background
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data.32 draw_hex_to_background
data.32 draw_font_tile_to_background
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data.32 draw_tile_to_background
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data.32 draw_pixel_to_background
data.32 draw_filled_rectangle_to_background
; overlay jump table
org.pad 0xF0043000
data.32 fill_overlay
data.32 draw_str_to_overlay
data.32 draw_format_str_to_overlay
data.32 draw_decimal_to_overlay
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data.32 draw_hex_to_overlay
data.32 draw_font_tile_to_overlay
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data.32 draw_tile_to_overlay
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data.32 draw_pixel_to_overlay
data.32 draw_filled_rectangle_to_overlay
data.32 check_if_overlay_covers_position
data.32 check_if_enabled_overlay_covers_position
data.32 enable_overlay
data.32 disable_overlay
data.32 move_overlay
data.32 resize_overlay
data.32 set_overlay_framebuffer_pointer
; menu bar jump table
org.pad 0xF0044000
data.32 enable_menu_bar
data.32 disable_menu_bar
data.32 menu_bar_click_event
data.32 clear_menu_bar
data.32 draw_menu_bar_root_items
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data.32 draw_menu_items
data.32 close_menu
data.32 menu_update_event
; disk jump table
org.pad 0xF0045000
data.32 read_sector
data.32 write_sector
data.32 ryfs_open
data.32 ryfs_seek
data.32 ryfs_read
data.32 ryfs_read_whole_file
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data.32 ryfs_get_size
data.32 ryfs_get_file_list
; memory copy/compare jump table
org.pad 0xF0046000
data.32 copy_memory_bytes
data.32 copy_memory_words
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data.32 copy_string
data.32 compare_memory_bytes
data.32 compare_memory_words
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data.32 compare_string
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data.32 string_length
; integer jump table
org.pad 0xF0047000
data.32 string_to_int
; audio jump table
org.pad 0xF0048000
data.32 play_audio
data.32 stop_audio
; random number jump table
org.pad 0xF0049000
data.32 random
data.32 random_range
org.pad 0xF004F000
standard_font_width:
data.16 8
standard_font_height:
data.16 16
standard_font_data:
#include_bin "font/unifont-thin.raw"
mouse_cursor:
#include_bin "font/cursor2.raw"
; cursor overlay struct:
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const CURSOR_WIDTH: 8
const CURSOR_HEIGHT: 12
const CURSOR_FRAMEBUFFER_PTR: 0x0214C000
; menu bar overlay struct:
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const MENU_BAR_WIDTH: 640
const MENU_BAR_HEIGHT: 16
const MENU_BAR_POSITION_X: 0
const MENU_BAR_POSITION_Y: 0
const MENU_BAR_FRAMEBUFFER_PTR: 0x0214C180
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; menu overlay struct:
; this struct must be writable, so these are hard-coded addresses in ram
const MENU_WIDTH: 0x02156180 ; 2 bytes
const MENU_HEIGHT: 0x02156182 ; 2 bytes
const MENU_POSITION_X: 0x02156184 ; 2 bytes
const MENU_POSITION_Y: 0x02156186 ; 2 bytes
const MENU_FRAMEBUFFER_PTR: 0x0215618A ; 4 bytes
const MENU_FRAMEBUFFER: 0x0215618E ; max 640x480x4 = end address at 0x0228218E
startup_str: data.str "fox32 - ROM version %u.%u.%u - insert boot disk - F12 for monitor" data.8 0
boot_str: data.str "fox32 - ROM version %u.%u.%u - booting..." data.8 0
boot_error_str: data.str "fox32 - ROM version %u.%u.%u - system.bin not found! - F12 for monitor" data.8 0
menu_items_root:
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data.8 1 ; number of menus
data.32 menu_items_system_list data.32 menu_items_system_name ; pointer to menu list, pointer to menu name
menu_items_system_name:
data.8 6 data.str "System" data.8 0x00 ; text length, text, null-terminator
menu_items_system_list:
data.8 2 ; number of items
data.8 13 ; menu width (usually longest item + 2)
data.8 11 data.str "Insert Disk" data.8 0x00 ; text length, text, null-terminator
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data.8 9 data.str "Shut Down" data.8 0x00 ; text length, text, null-terminator
; pad out to 512 KiB
org.pad 0xF0080000