fox32rom/main.asm

269 lines
6.6 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: 1
const FOX32ROM_VERSION_PATCH: 0
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const SYSTEM_STACK: 0x01FFF800
const BACKGROUND_COLOR: 0xFF414C50
; initialization code
entry:
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mov rsp, SYSTEM_STACK
mov [0x000003FC], system_vsync_handler
; disable all overlays
mov r31, 0x1F
mov r0, 0x80000300
disable_all_overlays_loop:
out r0, 0
inc r0
loop disable_all_overlays_loop
; write the cursor bitmap to the overlay framebuffer
mov r0, [overlay_31_framebuffer_ptr]
mov r1, mouse_cursor
mov r31, 96 ; 8x12
cursor_overlay_loop:
mov [r0], [r1]
add r0, 4
add r1, 4
loop cursor_overlay_loop
cursor_enable:
; set properties of overlay 31
mov r0, 0x8000011F ; overlay 31: size
mov.16 r1, [overlay_31_height]
sla r1, 16
mov.16 r1, [overlay_31_width]
out r0, r1
mov r0, 0x8000021F ; overlay 31: framebuffer pointer
mov r1, [overlay_31_framebuffer_ptr]
out r0, r1
; enable overlay 31 (cursor)
mov r0, 0x8000031F
out r0, 1
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mov r0, BACKGROUND_COLOR
call fill_background
menu_bar_enable:
; set properties of overlay 30
mov r0, 0x8000001E ; overlay 30: position
mov.16 r1, [overlay_30_position_y]
sla r1, 16
mov.16 r1, [overlay_30_position_x]
out r0, r1
mov r0, 0x8000011E ; overlay 30: size
mov.16 r1, [overlay_30_height]
sla r1, 16
mov.16 r1, [overlay_30_width]
out r0, r1
mov r0, 0x8000021E ; overlay 30: framebuffer pointer
mov r1, [overlay_30_framebuffer_ptr]
out r0, r1
; enable overlay 30 (menu bar)
mov r0, 0x8000031E
out r0, 1
call clear_menu_bar
mov r0, menu_items_root
mov r1, 0xFFFFFFFF
call draw_menu_bar_root_items
draw_startup_text:
mov r0, 252
mov r1, 229
mov r2, 136
mov r3, 40
mov r4, 0xFF505C60
;mov r4, 0xFFFFFFFF
call draw_filled_rectangle_to_background
mov r0, 253
mov r1, 230
mov r2, 134
mov r3, 38
mov r4, 0xFFFFFFFF
;mov r4, 0xFF000000
call draw_filled_rectangle_to_background
mov r0, 254
mov r1, 231
mov r2, 132
mov r3, 36
mov r4, 0xFF505C60
;mov r4, 0xFFFFFFFF
call draw_filled_rectangle_to_background
mov r0, startup_str_1
mov r1, 256
mov r2, 232
mov r3, 0xFFFFFFFF
mov r4, 0x00000000
call draw_str_to_background
mov r0, startup_str_2
mov r1, 256
mov r2, 248
call draw_str_to_background
ise
event_loop:
call get_next_event
; was the mouse clicked?
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cmp r0, MOUSE_CLICK_EVENT_TYPE
;ifz call mouse_click_event
; did the user click the menu bar?
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cmp r0, MENU_BAR_CLICK_EVENT_TYPE
ifz mov r0, menu_items_root
ifz call menu_bar_click_event
; is the user in a submenu?
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cmp r0, SUBMENU_UPDATE_EVENT_TYPE
ifz call submenu_update_event
; did the user click a submenu item?
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cmp r0, SUBMENU_CLICK_EVENT_TYPE
ifz call submenu_click_event
; check if a disk is mounted as disk 0
; if port 0x8000100n returns a non-zero value, then a disk is mounted as disk n
in r0, 0x80001000
cmp r0, 0
ifnz call start_boot_process
jmp event_loop
submenu_click_event:
; r3 contains the clicked submenu item
; about
cmp r3, 0
;
; mount disk
cmp r3, 1
ifz jmp mount_boot_disk
; halt
cmp r3, 2
ifz icl
ifz halt
ret
mount_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 "background.asm"
#include "boot.asm"
#include "debug.asm"
#include "event.asm"
#include "memory.asm"
#include "menu.asm"
#include "mouse.asm"
#include "overlay.asm"
#include "submenu.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
; background jump table
org.pad 0xF0041000
data.32 draw_str_to_background
data.32 draw_font_tile_to_background
data.32 fill_background
; overlay jump table
org.pad 0xF0042000
data.32 draw_str_to_overlay
data.32 draw_font_tile_to_overlay
data.32 fill_overlay
data.32 find_overlay_covering_position
data.32 check_if_overlay_covers_position
data.32 check_if_enabled_overlay_covers_position
; menu bar jump table
org.pad 0xF0043000
data.32 menu_bar_click_event
data.32 clear_menu_bar
data.32 draw_menu_bar_root_items
data.32 draw_submenu_items
data.32 close_submenu
org.pad 0xF004F000
font:
#include_bin "font/unifont-thin.raw"
mouse_cursor:
#include_bin "font/cursor2.raw"
; cursor overlay struct:
overlay_31_width: data.16 8
overlay_31_height: data.16 12
overlay_31_position_x: data.16 0
overlay_31_position_y: data.16 0
overlay_31_framebuffer_ptr: data.32 0x8012D000
; menu bar overlay struct:
overlay_30_width: data.16 640
overlay_30_height: data.16 16
overlay_30_position_x: data.16 0
overlay_30_position_y: data.16 0
overlay_30_framebuffer_ptr: data.32 0x8012D180
; submenu overlay struct:
; this struct must be writable, so these are hard-coded addresses in shared memory
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const OVERLAY_29_WIDTH: 0x80137180 ; 2 bytes
const OVERLAY_29_HEIGHT: 0x80137182 ; 2 bytes
const OVERLAY_29_POSITION_X: 0x80137184 ; 2 bytes
const OVERLAY_29_POSITION_Y: 0x80137186 ; 2 bytes
const OVERLAY_29_FRAMEBUFFER_PTR: 0x8013718A ; 4 bytes
const OVERLAY_29_FRAMEBUFFER: 0x8013718E
startup_str_1: data.str "Welcome to fox32" data.8 0
startup_str_2: data.str "Insert boot disk" data.8 0
menu_items_root:
data.8 1 ; number of submenus
data.32 menu_items_system_list data.32 menu_items_system_name ; pointer to submenu list, pointer to submenu 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 3 ; number of items
data.8 12 ; submenu width (usually longest item + 2)
data.8 5 data.str "About" data.8 0x00 ; text length, text, null-terminator
data.8 10 data.str "Mount Disk" data.8 0x00 ; text length, text, null-terminator
data.8 4 data.str "Halt" data.8 0x00 ; text length, text, null-terminator
; pad out to 512 KiB
org.pad 0xF0080000