BASIC Interpreter from MikeOS is functioning

.gitignore

@@ -1,3 +1,4 @@
 *.swp
 disk_images/*
 tmp-loop/*
+detailed.log

README.md

@@ -1,2 +1,3 @@
 Kernel written in Assmebly<br/>
 I'm using a modified JazzOS Bootloader<br/>
+And the MikeOS BASIC Interpreter<br/>

data/hello.bas

@@ -0,0 +1,2 @@
+PRINT "Hello World!"
+END

data/hello.cws

@@ -1 +0,0 @@
-output 'Hello World'

source/bootload/boot.asm

@@ -10,7 +10,7 @@ bdb_bytes_per_sector:       dw 200h ; = 512d
 bdb_sectors_per_cluster:    db 01h ; sector = cluster
 bdb_reserved_sectors:       dw 01h
 bdb_fat_count:              db 02h  ; We've got a fat1 and fat2
-bdb_dir_entries_count:      dw 0E0h ; Maximum number of root directory entries
+bdb_dir_entries_count:      dw 0E0h ; = 224d Maximum number of root directory entries
 bdb_total_sectors:          dw 0B40h ; = 2880d
 bdb_media_descriptor_type:  db 0F0h ; ignore
 bdb_sectors_per_fat:        dw 09h
@@ -68,7 +68,7 @@ main:
    shl ax,5 ; ax *= 32 (shifting 5 times) 
    xor dx,dx ; Clear dx (remainder)
    div word [bdb_bytes_per_sector] ;(32*num of entries)/bytes per sector = total number of sectors we need to read
-   test dx,dx ; See if there's a remainder
+   test dx,dx ; See if there's a remainder, ie the root directory doesn't take up a whole number of sectors
    jz root_dir_after
    inc ax ; Add one if there's a remainder (this is like rounding up)
 

source/kernel/data.asm

@@ -22,20 +22,23 @@ ebr_volume_label:           db 'CRAWOS0.0.6' ; must be 11 bytes
 ebr_system_id:              db 'FAT12   ' ; must be 8 bytes
 
 
+; String operations
 fat12_file_name: db '           ' ; 11 free bytes to store a filename in
-boot_message: db 'OK] Kernel successfully loaded!\n\n', 0
+boot_message: db 'OK] Kernel successfully loaded!\n"HELP" to see a list of available commands\n', 0
 user_input: times 20 db 0
 prompt_length: db 20
 prompt: db 'sh > ', 0
 help_string: db 'HELP', 0
 clear_string: db 'CLEAR', 0
 reboot_string: db 'REBOOT', 0
-pong_string: db 'PONG', 0
+basic_string: db 'BAS', 0
 cat_string: db 'CAT', 0
 ls_string: db 'LS', 0
-help_text: db 'This is for Cowards:\n"LS" to list the directory,\n"CAT" to output the contents of a file,\n"HELP" for this helpful text,\n"CLEAR" to clear the screen,\n"REBOOT" or esc to reboot\n', 0
+help_text: db 'This is for Cowards:\n"LS" to list the directory,\n"CAT" to output the contents of a file,\n"BAS" to run a basic script,\n"HELP" for this helpful text,\n"CLEAR" to clear the screen,\n"REBOOT" or esc to reboot\n', 0
+basic_text: db 'BASIC PROGRAM BEGUN:\n', 0
 command_result_text: db 'You typed: ', 0
 unknown_command: db 'Error: Unkown Command..\n ', 0
+stringified_int: db 0,0,0,0,0,0 ; Can store up to 6 digits
 
 ; Disk operations
 disk_read_fail: db 'Error: Could not read disk\n', 0

source/kernel/features/cli.asm

@@ -18,7 +18,7 @@ os_start_cli:
 os_read_cli:
 	pusha
 	mov si, user_input
-	call os_upper_case ; Make the input uppercase so it's case insensitive
+	call string_upper_case ; Make the input uppercase so it's case insensitive
 
 .output_the_user_input:
 	call os_print_newline
@@ -45,6 +45,13 @@ os_read_cli:
 	cmp cl, 1
 	je power_reboot
 
+	; Basic
+	mov si, user_input
+	mov di, basic_string
+	call os_compare_strings
+	cmp cl, 1
+	je basic
+
 	; Cat
 	mov si, user_input
 	mov di, cat_string
@@ -59,13 +66,6 @@ os_read_cli:
 	cmp cl, 1
 	je ls
 	
-	; Pong
-	mov si, user_input
-	mov di, pong_string
-	call os_compare_strings
-	cmp cl, 1
-	je pong
-
 	jmp .unkown
 
 .unkown:
@@ -88,10 +88,9 @@ help:
 	call os_print_string
 	call os_read_cli.finish
 
-pong:
+basic:
-	call game_pong
+	call util_basic
 	call os_read_cli.finish
-
 cat:
    call util_cat
    call os_read_cli.finish

source/kernel/features/disk.asm

@@ -173,7 +173,7 @@ disk_clear_output_buffer:
 ; TODO use predefined data for calculations
 disk_load_file:
    pusha
-   call os_string_length ; cl = string length
+   call string_length ; cl = string length
    cmp cl, 11
    ja .filename_too_long
 
@@ -244,7 +244,7 @@ disk_load_file:
 disk_write_file:
 	pusha
 	; Check if file name is too long
-	call os_string_length ; cl = string length
+	call string_length ; cl = string length
 	cmp cl, 11
 	ja .filename_too_long
 	; Convert file name to a fat filename
@@ -302,6 +302,7 @@ disk_write_file:
 		ret
 
 ; TODO support long file names
+; TODO don't work twice
 ; Store a list of the files in file_buffer
 ; in a human readable format
 ; OUT
@@ -374,3 +375,14 @@ disk_list_contents:
 		stosb
 		popa
 		ret
+
+disk_file_exists:
+	ret
+disk_file_size:
+	ret
+disk_file_list:
+	ret
+disk_remove_file:
+	ret
+disk_rename_file:
+	ret

source/kernel/features/graphics.asm

@@ -51,3 +51,10 @@ section .data
 	y_end dw 0
 	colour db 1111b
 
+graphics_dialogue_box:
+	ret
+
+graphics_file_selector:
+	ret
+graphics_list_dialogue:
+	ret

source/kernel/features/keyboard.asm

@@ -75,3 +75,16 @@ os_display_input:
 		int 10h
 
 		ret
+
+keyboard_get_cursor_pos: ;TODO
+	ret
+keyboard_wait_for_key:   ;TODO
+	ret
+keyboard_show_cursor:
+	ret
+keyboard_hide_cursor:
+	ret
+keyboard_move_cursor:
+	ret
+keyboard_check_key:
+	ret

source/kernel/features/math.asm

@@ -52,3 +52,5 @@ math_lba_to_chs:
     pop ax
 
     ret
+math_get_random:
+	ret

source/kernel/features/misc.asm

@@ -0,0 +1,4 @@
+misc_pause:
+	ret
+misc_get_api_version:
+	ret

source/kernel/features/ports.asm

@@ -0,0 +1,10 @@
+port_byte_out:
+	ret
+port_byte_in:
+	ret
+port_serial_enable:
+	ret
+port_send_via_serial:
+	ret
+port_get_via_serial:
+	ret

source/kernel/features/sound.asm

@@ -0,0 +1,4 @@
+sound_speaker_tone:
+	ret
+sound_speaker_off:
+	ret

source/kernel/features/strings.asm

@@ -35,11 +35,152 @@ os_compare_strings:
 		mov cl, 1
 		ret
 
+; ------------------------------------------------------------------
+; os_string_compare -- See if two strings match
+; IN: SI = string one, DI = string two
+; OUT: carry set if same, clear if different
+; from MikeOS kernel
+
+string_direct_compare:
+	pusha
+	.more:
+		mov al, [si]                    ; Retrieve string contents
+		mov bl, [di]
+		cmp al, bl                      ; Compare characters at current location
+		jne .not_same
+		cmp al, 0                       ; End of first string? Must also be end of second
+		je .end
+		inc si
+		inc di
+		jmp .more
+	.not_same:                              ; If unequal lengths with same beginning, the byte
+		popa                            ; comparison fails at shortest string terminator
+		clc                             ; Clear carry flag
+		ret
+	.end:                            ; Both strings terminated at the same position
+		popa
+		stc                             ; Set carry flag
+		ret
+
+
+; --------------------------------------------------------------------
+; Copies a string from si to di
+; IN:
+; si: points to first character of source string
+; OUT:
+; di: points to first character of destination string
+string_copy:
+	pusha
+	.loop:
+		; TODO could this cause issue when a character is > 1 byte?
+		lodsb   ; Load si character into ax and increment si by 1
+		stosb   ; Store ax in di location and increment di by 1
+		cmp ax, 0  ; if ax is a 0, quit
+		jne .loop
+	.done:
+		popa
+		ret
+
+; --------------------------------------------------------------------
+; Joins two strings together into a new string
+; IN/OUT:
+; ax: string1
+; bx: string2
+; cx: result string
+
+string_join:
+	pusha
+	.copy_string1:
+		mov si, ax
+		mov di, cx
+		call string_copy
+		mov ax, cx ; TODO check this bit
+		call string_length
+		add cx, ax
+	.copy_string2:
+		mov si, bx
+		mov di, dx
+		call string_copy
+	.done:
+		popa
+		ret
+
+; ------------------------------------------------------------------------
+; TODO
+string_cast_to_int:
+	ret
+
+; ------------------------------------------------------------------------
+
+; IN: AX = int
+; OUT: AX = string location (output buffer)
+string_cast_from_int: ; TODO I think this algorithm could be optimised
+	pusha
+	; Initialise base to decimal (base 10)
+	mov bx, 10
+	; clear the strigified int location
+	mov cx, 6
+	push ax
+	xor ax,ax
+	.clear_loop:
+		stosb
+		dec cx
+		cmp cx, 0
+		ja .clear_loop
+	; setup
+	pop ax
+	push ax
+	mov cx, -1
+	; loop over number to get the value of count (cx)
+	.count_loop:
+		xor dx,dx
+		div bx ; ax = ax // bx
+		inc cx
+		cmp ax, 0
+		ja .count_loop ; Jump if greater
+	pop ax
+	; loop over count downwards until count is 0
+	mov di, stringified_int
+	.stringify_loop:
+		mov cx,1 ;DEL
+		push cx
+		push bx
+		push ax
+		; Generate power of 10
+		mov ax, 1
+		mov cx,0 ;DEL
+		cmp cx, 1
+		jl .after_power_loop
+		.power_loop:
+			mul bx
+			dec cx
+			cmp cx, 0
+			ja .power_loop
+		.after_power_loop:
+		mov bx,ax
+		pop ax
+		pop cx
+		; ax = ax DIV bx
+		; dx = ax MOD bx
+		xor dx,dx
+		div bx
+		pop bx
+		add ax, 30h
+		stosb
+		mov ax, dx
+		dec cx
+		cmp cx, 0
+		ja .stringify_loop
+	.finish:
+		popa
+		;mov ax, stringified_int
+		ret
+
 ; Get the length of a string
 ; 'hello world', 0 is 11 characters long (excluding the terminator)
 ; input: si points to the string to be counted
 ; output: cl holds the length
-os_string_length:
+string_length:
    push si
    xor cl,cl ; Clear the al register
 .loop:
@@ -52,6 +193,8 @@ os_string_length:
    pop si
    ret
 
+
+
 ; convert a string to fat's filename format
 ; It will be capitalised and 11 characters long,
 ; 8 for the filename, 3 for the extension
@@ -60,8 +203,8 @@ os_string_length:
 ; output: di points to the fat formatted filename
 os_format_fat_filename:
    pusha
-   call os_upper_case
+   call string_upper_case
-   call os_string_length ; Stores the length of the string in cl
+   call string_length ; Stores the length of the string in cl
    xor ch,ch ; Clear ch to reset it to 0
    .character_loop:
 	  lodsb
@@ -147,7 +290,7 @@ string_unformat_fat_filename:
 ; Convert a string to all upper/lower case
 ; INPUT: si pointing to a string
 ; OUPUT: the same string in memory will now be capitalised/decapitalised
-os_upper_case: ; to upper case
+string_upper_case: ; to upper case
     pusha
     mov di, si
 .loop:
@@ -187,3 +330,9 @@ os_lower_case: ; to lower case
     popa
     ret
 
+string_lower_case:
+	ret
+string_input:
+	ret
+string_print_2hex:
+	ret

source/kernel/features/utils.asm

@@ -17,12 +17,30 @@ util_cat:
 util_ls:
    pusha
 
-   call disk_clear_output_buffer
+   call disk_load_root
    call disk_list_contents
 
    mov si, output_buffer
    call os_print_string
+   call disk_clear_output_buffer
 
    popa
    ret
 
+util_basic:
+	pusha
+
+	call disk_load_root
+
+	; TODO make this more consistent to account for double spaces
+	;add si, 3 ; Move si to after 'BAS'
+	call disk_load_file
+
+	mov si, file_buffer
+
+	mov ax, si
+	mov si, 0
+	call basic_run_basic
+
+	popa
+	ret

source/kernel/kernel.asm

@@ -10,8 +10,12 @@ start:
 
    mov si, boot_message
    call os_print_string
-   mov si, help_text
+
-   call os_print_string
+   ; TESTING
+   ;mov ax, 3
+   ;call string_cast_from_int
+   ;mov si, stringified_int
+   ;call os_print_string
 
    call os_start_cli
    hlt
@@ -24,16 +28,18 @@ halt:
 ; FEATURES -- Code to pull into the kernel
 	%INCLUDE "source/kernel/features/text.asm"
 	%INCLUDE "source/kernel/features/keyboard.asm"
-	%INCLUDE "source/kernel/features/cli.asm"
+	%INCLUDE "source/kernel/features/ports.asm"
 	%INCLUDE "source/kernel/features/power.asm"
 	%INCLUDE "source/kernel/features/strings.asm"
 	%INCLUDE "source/kernel/features/graphics.asm"
+	%INCLUDE "source/kernel/features/sound.asm"
 	%INCLUDE "source/kernel/features/disk.asm"
 	%INCLUDE "source/kernel/features/math.asm"
 	%INCLUDE "source/kernel/features/time.asm"
 	%INCLUDE "source/kernel/features/utils.asm"
-; GAMES -- Games that I wrote for it
+	%INCLUDE "source/kernel/features/cli.asm"
-	%INCLUDE "source/kernel/games/pong.asm"
+	%INCLUDE "source/kernel/features/misc.asm"
+	%INCLUDE "source/kernel/features/basic.asm"
 
 ; DATA/VARIABLES
 	%INCLUDE "source/kernel/data.asm"

test-linux.sh

@@ -5,5 +5,7 @@ sudo chown $(whoami) disk_images/*
 qemu-system-i386\
 	-drive file=disk_images/crawos.img,if=floppy,format=raw\
 	-m 512m\
-       	-object memory-backend-file,id=pc.ram,size=512m,mem-path=/dev/shm/qemu-ram,share=on -machine memory-backend=pc.ram\
+	-object memory-backend-file,id=pc.ram,size=512m,mem-path=/dev/shm/qemu-ram,share=on\
+	-machine memory-backend=pc.ram\
+	-d in_asm,int -D ./detailed.log\
 	$1 $2