Moved stuff around and added a makefile also got a custom bootloader

based on the JazzOS bootloader (modified a bit)

source/kernel/games/snake.asm

@@ -0,0 +1,94 @@
+game_snake:
+   call .draw_screen
+   call .detect_input
+
+.draw_screen:
+   call os_set_graphics_mode ; Clear screen
+.draw_snake_loop:
+   mov ax, [snake_x]
+   mov [x_start], ax
+   mov [x_end], ax
+
+   mov bx, [snake_y]
+   mov [y_start], bx
+   mov [y_end], bx
+
+   call os_draw_graphical_rectangle
+   ret
+
+; Player 1 movements
+.up:
+   mov dword [snake_direction], 0
+   jmp .end_detect_input
+.down:
+   mov dword [snake_direction], 2
+   jmp .end_detect_input
+.left:
+   mov dword [snake_direction], 3
+   jmp .end_detect_input
+.right:
+   mov dword [snake_direction], 1
+   jmp .end_detect_input
+
+.move_up:
+   mov dx, [snake_y]
+   sub dx, 1
+   mov [snake_y], dx
+   ret
+.move_down:
+   mov dx, [snake_y]
+   add dx, 1
+   mov [snake_y], dx
+   ret
+.move_left:
+   mov dx, [snake_x]
+   sub dx, 1
+   mov [snake_x], dx
+   ret
+.move_right:
+   mov dx, [snake_x]
+   add dx, 1
+   mov [snake_x], dx
+   ret
+
+.move_snake:
+   cmp dword [snake_direction], 0
+   je .move_up
+   cmp dword [snake_direction], 1
+   je .move_right
+   cmp dword [snake_direction], 2
+   je .move_down
+   ; Else it must be left
+   jmp .move_left
+
+
+.detect_input:
+   call os_read_input
+   cmp al, 08h
+   je .finish
+
+   ; Player 1
+   cmp al, 77h       ; Pressed 'w' up
+   je .up
+   cmp al, 61h       ; Pressed 'a' left
+   je .left
+   cmp al, 73h       ; Pressed 's' down
+   je .down
+   cmp al, 64h       ; Pressed 'd' right
+   je .right
+.end_detect_input:
+   call .move_snake
+   call .draw_screen
+
+   jmp .detect_input
+
+.finish:
+   call os_set_text_mode
+   call os_start_cli
+
+
+section .data:
+   snake_x: dw 5
+   snake_y: dw 5
+   snake_direction: dw 1 ; 0=up, 1=right, 2=down, 3=left
+   snake_length: dw 1