401 lines
9.7 KiB
NASM
401 lines
9.7 KiB
NASM
; entry point
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; fox32 starts here on reset
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org 0xF0000000
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const FOX32ROM_VERSION_MAJOR: 0
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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
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const TEXT_COLOR: 0xFFFFFFFF
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; initialization code
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entry:
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; disable the MMU
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mcl
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; set the stack pointer
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mov rsp, SYSTEM_STACK
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; disable audio playback
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mov r0, 0x80000600
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out r0, 0
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; seed the random number generator
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entry_seed:
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mov [0x000003FC], entry_seed_done
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ise
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mov r0, 2166136261
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entry_seed_loop:
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mul r0, 16777619
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rjmp entry_seed_loop
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entry_seed_done:
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mov [RANDOM_STATE], r0
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; set the stack pointer again to pop the return address and flags off the stack
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mov rsp, SYSTEM_STACK
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; set the interrupt vector for interrupt 0xFF - vsync
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mov [0x000003FC], system_vsync_handler
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; set the exception vector for exception 0x00 - divide by zero
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mov [0x00000400], system_div_zero_handler
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; set the exception vector for exception 0x01 - invalid opcode
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mov [0x00000404], system_invalid_op_handler
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; set the exception vector for exception 0x02 - page fault read
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mov [0x00000408], system_page_fault_handler
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; set the exception vector for exception 0x03 - page fault write
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mov [0x0000040C], system_page_fault_handler
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; set the exception vector for exception 0x04 - breakpoint
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mov [0x00000410], system_breakpoint_handler
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; ensure the event queue gets initialized properly
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mov [EVENT_QUEUE_POINTER], 0
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; initialize the monitor X and Y coordinates
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mov.8 [MONITOR_CONSOLE_X], 0
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mov.8 [MONITOR_CONSOLE_Y], 28
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; enable interrupts
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ise
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; disable all overlays
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mov r31, 0x1F
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mov r0, 0x80000300
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disable_all_overlays_loop:
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out r0, 0
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inc r0
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loop disable_all_overlays_loop
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call enable_cursor
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mov r0, BACKGROUND_COLOR
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call fill_background
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; draw the bottom bar
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mov r0, bottom_bar_str_0
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mov r1, 8
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mov r2, 448
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mov r3, TEXT_COLOR
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mov r4, 0x00000000
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call draw_str_to_background
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mov r0, bottom_bar_patterns
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mov r1, 1
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mov r2, 16
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call set_tilemap
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mov r1, 0
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mov r2, 464
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mov r31, 640
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draw_bottom_bar_loop:
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mov r4, r31
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rem r4, 2
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cmp r4, 0
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ifz mov r0, 0
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ifnz mov r0, 1
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call draw_tile_to_background
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inc r1
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loop draw_bottom_bar_loop
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mov r0, 10
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mov r1, 464
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mov r2, 20
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mov r3, 16
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mov r4, 0xFFFFFFFF
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call draw_filled_rectangle_to_background
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mov r0, bottom_bar_str_1
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mov r1, 12
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mov r2, 464
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mov r3, 0xFF000000
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mov r4, 0xFFFFFFFF
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call draw_str_to_background
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mov r0, bottom_bar_str_2
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mov r1, 480
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mov r2, 464
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mov r3, 0xFF000000
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mov r4, 0xFFFFFFFF
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mov r10, FOX32ROM_VERSION_MAJOR
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mov r11, FOX32ROM_VERSION_MINOR
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mov r12, FOX32ROM_VERSION_PATCH
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call draw_format_str_to_background
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mov r0, disk_icon_q
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call change_icon
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call setup_icon
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event_loop:
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call get_next_event
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; no event handling here
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; check if a disk is inserted as disk 0
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; if port 0x8000100n returns a non-zero value, then a disk is inserted as disk n
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in r0, 0x80001000
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cmp r0, 0
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ifnz call start_boot_process
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call is_romdisk_available
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ifz call start_boot_process_from_romdisk
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jmp event_loop
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get_rom_version:
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mov r0, FOX32ROM_VERSION_MAJOR
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mov r1, FOX32ROM_VERSION_MINOR
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mov r2, FOX32ROM_VERSION_PATCH
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ret
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get_rom_api_version:
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mov r0, FOX32ROM_API_VERSION
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ret
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poweroff:
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mov r0, 0x80010000
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mov r1, 0
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out r0, r1
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poweroff_wait:
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jmp poweroff_wait
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; code
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#include "audio.asm"
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#include "background.asm"
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#include "boot.asm"
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#include "cursor.asm"
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#include "debug.asm"
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#include "disk.asm"
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#include "draw_pixel.asm"
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#include "draw_rectangle.asm"
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#include "draw_text.asm"
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#include "draw_tile.asm"
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#include "event.asm"
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#include "exception.asm"
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#include "icon.asm"
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#include "integer.asm"
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#include "keyboard.asm"
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#include "memory.asm"
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#include "menu.asm"
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#include "menu_bar.asm"
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#include "monitor/monitor.asm"
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#include "mouse.asm"
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#include "overlay.asm"
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#include "panic.asm"
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#include "random.asm"
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#include "ryfs.asm"
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#include "string.asm"
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#include "vsync.asm"
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; TODO: convert these icons to 1 bit bitmaps and move
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; them down to the data section at 0xF004F000,
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; once 1 bit drawing routines are implemented
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disk_icon:
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#include_bin "font/disk1.raw"
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disk_icon_q:
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#include_bin "font/disk2.raw"
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; data
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; system jump table
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org.pad 0xF0040000
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data.32 get_rom_version
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data.32 system_vsync_handler
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data.32 get_mouse_position
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data.32 new_event
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data.32 wait_for_event
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data.32 get_next_event
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data.32 panic
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data.32 get_mouse_button
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data.32 scancode_to_ascii
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data.32 shift_pressed
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data.32 shift_released
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data.32 caps_pressed
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data.32 poweroff
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data.32 get_rom_api_version
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; generic drawing jump table
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org.pad 0xF0041000
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data.32 draw_str_generic
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data.32 draw_format_str_generic
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data.32 draw_decimal_generic
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data.32 draw_hex_generic
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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
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data.32 draw_filled_rectangle_generic
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data.32 get_tilemap
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; background jump table
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org.pad 0xF0042000
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data.32 fill_background
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data.32 draw_str_to_background
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data.32 draw_format_str_to_background
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data.32 draw_decimal_to_background
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data.32 draw_hex_to_background
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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
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data.32 draw_filled_rectangle_to_background
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; overlay jump table
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org.pad 0xF0043000
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data.32 fill_overlay
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data.32 draw_str_to_overlay
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data.32 draw_format_str_to_overlay
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data.32 draw_decimal_to_overlay
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data.32 draw_hex_to_overlay
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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
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data.32 draw_filled_rectangle_to_overlay
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data.32 check_if_overlay_covers_position
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data.32 check_if_enabled_overlay_covers_position
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data.32 enable_overlay
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data.32 disable_overlay
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data.32 move_overlay
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data.32 resize_overlay
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data.32 set_overlay_framebuffer_pointer
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data.32 get_unused_overlay
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data.32 make_coordinates_relative_to_overlay
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; menu bar jump table
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org.pad 0xF0044000
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data.32 enable_menu_bar
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data.32 disable_menu_bar
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data.32 menu_bar_click_event
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data.32 clear_menu_bar
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data.32 draw_menu_bar_root_items
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data.32 draw_menu_items
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data.32 close_menu
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data.32 menu_update_event
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; disk jump table
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org.pad 0xF0045000
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data.32 read_sector
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data.32 write_sector
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data.32 ryfs_open
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data.32 ryfs_seek
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data.32 ryfs_read
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data.32 ryfs_read_whole_file
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data.32 ryfs_get_size
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data.32 ryfs_get_file_list
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data.32 ryfs_tell
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data.32 ryfs_write
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data.32 is_romdisk_available
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; memory copy/compare jump table
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org.pad 0xF0046000
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data.32 copy_memory_bytes
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data.32 copy_memory_words
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data.32 copy_string
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data.32 compare_memory_bytes
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data.32 compare_memory_words
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data.32 compare_string
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data.32 string_length
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; integer jump table
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org.pad 0xF0047000
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data.32 string_to_int
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; audio jump table
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org.pad 0xF0048000
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data.32 play_audio
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data.32 stop_audio
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; random number jump table
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org.pad 0xF0049000
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data.32 random
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data.32 random_range
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org.pad 0xF004F000
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standard_font_width:
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data.16 8
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standard_font_height:
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data.16 16
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standard_font_data:
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#include_bin "font/unifont-thin.raw"
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mouse_cursor:
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#include_bin "font/cursor2.raw"
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; icon overlay struct:
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const ICON_WIDTH: 32
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const ICON_HEIGHT: 32
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const ICON_POSITION_X: 304
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const ICON_POSITION_Y: 224
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const ICON_FRAMEBUFFER_PTR: 0x0212C000
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; cursor overlay struct:
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const CURSOR_WIDTH: 8
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const CURSOR_HEIGHT: 12
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const CURSOR_FRAMEBUFFER_PTR: 0x0214C000
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; menu bar overlay struct:
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const MENU_BAR_WIDTH: 640
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const MENU_BAR_HEIGHT: 16
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const MENU_BAR_POSITION_X: 0
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const MENU_BAR_POSITION_Y: 0
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const MENU_BAR_FRAMEBUFFER_PTR: 0x0214C180
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; menu overlay struct:
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; this struct must be writable, so these are hard-coded addresses in ram
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const MENU_WIDTH: 0x02156180 ; 2 bytes
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const MENU_HEIGHT: 0x02156182 ; 2 bytes
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const MENU_POSITION_X: 0x02156184 ; 2 bytes
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const MENU_POSITION_Y: 0x02156186 ; 2 bytes
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const MENU_FRAMEBUFFER_PTR: 0x0215618A ; 4 bytes
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const MENU_FRAMEBUFFER: 0x0215618E ; max 640x480x4 = end address at 0x0228218E
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bottom_bar_str_0: data.strz "FOX"
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bottom_bar_str_1: data.strz "32"
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bottom_bar_str_2: data.strz " ROM version %u.%u.%u "
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bottom_bar_patterns:
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; 1x16 tile
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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; 1x16 tile
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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data.32 0xFFFFFFFF
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data.32 0xFF674764
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romdisk_image:
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#include_bin_optional "romdisk.img"
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romdisk_image_end:
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; pad out to 512 KiB
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org.pad 0xF0080000
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