fox32rom/main.asm

401 lines
9.7 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: 7
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const FOX32ROM_VERSION_PATCH: 0
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const FOX32ROM_API_VERSION: 1
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const SYSTEM_STACK: 0x01FFF800
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const BACKGROUND_COLOR: 0xFF674764
const TEXT_COLOR: 0xFFFFFFFF
; initialization code
entry:
; disable the MMU
mcl
; set the stack pointer
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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 stack 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
; set the exception vector for exception 0x00 - divide by zero
mov [0x00000400], system_div_zero_handler
; set the exception vector for exception 0x01 - invalid opcode
mov [0x00000404], system_invalid_op_handler
; set the exception vector for exception 0x02 - page fault read
mov [0x00000408], system_page_fault_handler
; set the exception vector for exception 0x03 - page fault write
mov [0x0000040C], system_page_fault_handler
; set the exception vector for exception 0x04 - breakpoint
mov [0x00000410], system_breakpoint_handler
; ensure the event queue gets initialized properly
mov [EVENT_QUEUE_POINTER], 0
; initialize the monitor X and Y coordinates
mov.8 [MONITOR_CONSOLE_X], 0
mov.8 [MONITOR_CONSOLE_Y], 28
; enable interrupts
ise
; 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
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; draw the bottom bar
mov r0, bottom_bar_str_0
mov r1, 8
mov r2, 448
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mov r3, TEXT_COLOR
mov r4, 0x00000000
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call draw_str_to_background
mov r0, bottom_bar_patterns
mov r1, 1
mov r2, 16
call set_tilemap
mov r1, 0
mov r2, 464
mov r31, 640
draw_bottom_bar_loop:
mov r4, r31
rem r4, 2
cmp r4, 0
ifz mov r0, 0
ifnz mov r0, 1
call draw_tile_to_background
inc r1
loop draw_bottom_bar_loop
mov r0, 10
mov r1, 464
mov r2, 20
mov r3, 16
mov r4, 0xFFFFFFFF
call draw_filled_rectangle_to_background
mov r0, bottom_bar_str_1
mov r1, 12
mov r2, 464
mov r3, 0xFF000000
mov r4, 0xFFFFFFFF
call draw_str_to_background
mov r0, bottom_bar_str_2
mov r1, 480
mov r2, 464
mov r3, 0xFF000000
mov r4, 0xFFFFFFFF
mov r10, FOX32ROM_VERSION_MAJOR
mov r11, FOX32ROM_VERSION_MINOR
mov r12, FOX32ROM_VERSION_PATCH
call draw_format_str_to_background
mov r0, disk_icon_q
call change_icon
call setup_icon
event_loop:
call get_next_event
; no event handling here
; 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
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call is_romdisk_available
ifz call start_boot_process_from_romdisk
jmp event_loop
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get_rom_version:
mov r0, FOX32ROM_VERSION_MAJOR
mov r1, FOX32ROM_VERSION_MINOR
mov r2, FOX32ROM_VERSION_PATCH
ret
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get_rom_api_version:
mov r0, FOX32ROM_API_VERSION
ret
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poweroff:
mov r0, 0x80010000
mov r1, 0
out r0, r1
poweroff_wait:
jmp poweroff_wait
; 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"
#include "exception.asm"
#include "icon.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"
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; TODO: convert these icons to 1 bit bitmaps and move
; them down to the data section at 0xF004F000,
; once 1 bit drawing routines are implemented
disk_icon:
#include_bin "font/disk1.raw"
disk_icon_q:
#include_bin "font/disk2.raw"
; 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
data.32 get_mouse_button
data.32 scancode_to_ascii
data.32 shift_pressed
data.32 shift_released
data.32 caps_pressed
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data.32 poweroff
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data.32 get_rom_api_version
; 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
data.32 get_tilemap
; 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
data.32 get_unused_overlay
data.32 make_coordinates_relative_to_overlay
; 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
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data.32 ryfs_tell
data.32 ryfs_write
data.32 is_romdisk_available
; 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"
; icon overlay struct:
const ICON_WIDTH: 32
const ICON_HEIGHT: 32
const ICON_POSITION_X: 304
const ICON_POSITION_Y: 224
const ICON_FRAMEBUFFER_PTR: 0x0212C000
; 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
bottom_bar_str_0: data.strz "FOX"
bottom_bar_str_1: data.strz "32"
bottom_bar_str_2: data.strz " ROM version %u.%u.%u "
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bottom_bar_patterns:
; 1x16 tile
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
; 1x16 tile
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
data.32 0xFFFFFFFF
data.32 0xFF674764
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romdisk_image:
#include_bin_optional "romdisk.img"
romdisk_image_end:
; pad out to 512 KiB
org.pad 0xF0080000