fox32rom/main.asm
Ry d1009a1680 Fix broken ryfs_read routine, bump version to 0.3.1
There were two issues here:
First, ryfs_read_sector_loop was not setting the current sector to the
next sector of the file being read. This had the effect of making it
read the same sector over and over again.
Second, the destination pointer for the `copy_memory_bytes` call wasn't
being changed after each sector copy.
2022-08-10 18:12:14 -07:00

309 lines
7.9 KiB
NASM

; entry point
; fox32 starts here on reset
org 0xF0000000
const FOX32ROM_VERSION_MAJOR: 0
const FOX32ROM_VERSION_MINOR: 3
const FOX32ROM_VERSION_PATCH: 1
const SYSTEM_STACK: 0x01FFF800
const BACKGROUND_COLOR: 0xFF674764
const TEXT_COLOR: 0xFFFFFFFF
; initialization code
entry:
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
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
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?
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?
cmp r0, EVENT_TYPE_MENU_BAR_CLICK
ifz mov r0, menu_items_root
ifz call menu_bar_click_event
; is the user in a menu?
cmp r0, EVENT_TYPE_MENU_UPDATE
ifz call menu_update_event
; did the user click a menu item?
cmp r0, EVENT_TYPE_MENU_CLICK
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
menu_click_event:
; r3 contains the clicked menu item
; insert disk
cmp r3, 0
ifz jmp insert_boot_disk
; shutdown
cmp r3, 1
ifz icl
ifz halt
ret
insert_boot_disk:
mov r0, 0x80001000
out r0, 0
ret
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"
#include "draw_pixel.asm"
#include "draw_rectangle.asm"
#include "draw_text.asm"
#include "draw_tile.asm"
#include "event.asm"
#include "integer.asm"
#include "keyboard.asm"
#include "memory.asm"
#include "menu.asm"
#include "menu_bar.asm"
#include "monitor/monitor.asm"
#include "mouse.asm"
#include "overlay.asm"
#include "panic.asm"
#include "random.asm"
#include "ryfs.asm"
#include "string.asm"
#include "vsync.asm"
; data
; system jump table
org.pad 0xF0040000
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
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
data.32 draw_hex_generic
data.32 draw_font_tile_generic
data.32 draw_tile_generic
data.32 set_tilemap
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
data.32 draw_hex_to_background
data.32 draw_font_tile_to_background
data.32 draw_tile_to_background
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
data.32 draw_hex_to_overlay
data.32 draw_font_tile_to_overlay
data.32 draw_tile_to_overlay
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
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
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
data.32 copy_string
data.32 compare_memory_bytes
data.32 compare_memory_words
data.32 compare_string
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:
const CURSOR_WIDTH: 8
const CURSOR_HEIGHT: 12
const CURSOR_FRAMEBUFFER_PTR: 0x0214C000
; menu bar overlay struct:
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
; 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:
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
data.8 9 data.str "Shut Down" data.8 0x00 ; text length, text, null-terminator
; pad out to 512 KiB
org.pad 0xF0080000