Added port support, and removed things from BASIC_DEVELOPMENT it does not yet support

source/kernel/features/disk.asm

@@ -354,12 +354,12 @@ disk_list_contents:
 		popa
 		ret
 
+disk_file_list:
+	ret
 disk_file_exists:
 	ret
 disk_file_size:
 	ret
-disk_file_list:
-	ret
 disk_remove_file:
 	ret
 disk_rename_file:

source/kernel/features/keyboard.asm

@@ -1,4 +1,5 @@
 ; AX = key pressed
+; Waits until key is pressed before returning
 os_read_input:
 	mov ah, 11h			; BIOS call to check for key
 	int 16h				; Interrupt
@@ -12,6 +13,16 @@ os_read_input:
 		int 16h
 		ret
 
+; AX = key pressed
+; Returns straight away
+keyboard_check_key:
+	xor ax,ax
+	mov ah, 11h			; BIOS call to check for key
+	int 16h				; Interrupt
+	jz .no_key
+	.no_key:
+		xor ax,ax
+		ret
 ; -------------------------------------------
 ; IN:
 ; AX = output address
@@ -23,11 +34,6 @@ keyboard_display_input:
 	mov ax, bx
 	mov bx,20 
 
-	.loop:
-		jmp .check_key_pressed
-
-		jmp .loop
-
 	.check_key_pressed:
 		call os_read_input
 
@@ -43,7 +49,8 @@ keyboard_display_input:
 		dec bx
 
 		cmp bx, 0
-		jae .print_current_input ; Echo the user input back
+		je .enter_key           ; Once the limit is reached just enter it
+		ja .print_current_input ; Echo the user input back
 
 		jmp .check_key_pressed
 
@@ -59,7 +66,7 @@ keyboard_display_input:
 	.backspace:
 		cmp bx, 20						; Cannot backspace if the cursor is at the start
 		jb .move_cursor_back			; then .move_cursor_back
-		jmp .loop						; Else .loop
+		jmp .check_key_pressed			; Else check the next key
 
 	.move_cursor_back:
 		mov ah, 0Eh
@@ -73,7 +80,7 @@ keyboard_display_input:
 
 		inc bx
 		dec di
-		jmp .loop
+		jmp .check_key_pressed
 
 	.print_current_input: ; Echo back that character and return the key inputing
 		stosb
@@ -81,9 +88,9 @@ keyboard_display_input:
 		int 10h
 		jmp .check_key_pressed
 
-keyboard_get_cursor_pos: ;TODO
+keyboard_get_cursor_pos:
 	ret
-keyboard_wait_for_key:   ;TODO
+keyboard_wait_for_key:	
 	ret
 keyboard_show_cursor:
 	ret
@@ -91,5 +98,3 @@ keyboard_hide_cursor:
 	ret
 keyboard_move_cursor:
 	ret
-keyboard_check_key:
-	ret

source/kernel/features/ports.asm

@@ -1,7 +1,20 @@
+; IN:
+; DX = port address
+; AL = byte
 port_byte_out:
+	pusha
+	out dx,al
+	popa
 	ret
+; -----------------------------------------
+; IN:
+; DX = port address
+; OUT:
+; AL = byte from port
 port_byte_in:
+	in al, dx
 	ret
+
 port_serial_enable:
 	ret
 port_send_via_serial:

source/kernel/features/strings.asm

@@ -331,7 +331,5 @@ string_lower_case: ; to lower case
 	popa
 	ret
 
-string_input:
-	ret
 string_print_2hex:
 	ret