BITS 16
	CPU 386				; pusha offsets depends on a 386 or better
					; FS and GS require a 386 or better

	%DEFINE CRAWOS_VER '0.0.2'	; OS version number
	%DEFINE CRAWOS_API_VER 1	; API version for programs to check


	; This is the location in RAM for kernel disk operations, 24K
	; after the point where the kernel has loaded; it's 8K in size,
	; because external programs load after it at the 32K point:

	disk_buffer	equ	24576



; ------------------------------------------------------------------
; START OF MAIN KERNEL CODE

os_main:
	cli				; Clear interrupts
	mov ax, 0
	mov ss, ax			; Set stack segment and pointer
	mov sp, 0FFFFh
	sti				; Restore interrupts

	cld				; The default direction for string operations
					; will be 'up' - incrementing address in RAM

	mov ax, 2000h			; Set all segments to match where kernel is loaded
	mov ds, ax			; After this, we don't need to bother with
	mov es, ax			; segments ever again, as MikeOS and its programs
	mov fs, ax			; live entirely in 64K
	mov gs, ax

	cmp dl, 0
	je no_change

no_change:
	mov si, help_text
	call os_print_string_nl
	call os_start_cli

bootdev db 0
SecsPerTrack dw 18
Sides dw 2

; ------------------------------------------------------------------
; SYSTEM VARIABLES -- Settings for programs and system calls


	; Time and date formatting

	fmt_12_24	db 0		; Non-zero = 24-hr format

	fmt_date	db 0, '/'	; 0, 1, 2 = M/D/Y, D/M/Y or Y/M/D
					; Bit 7 = use name for months
					; If bit 7 = 0, second byte = separator character


; ------------------------------------------------------------------
; FEATURES -- Code to pull into the kernel

	%INCLUDE "features/screen.asm"
	%INCLUDE "features/cli.asm"
	%INCLUDE "features/power.asm"
	%INCLUDE "features/strings.asm"
	%INCLUDE "features/graphics.asm"
	%INCLUDE "features/sound.asm"

; GAMES
	%INCLUDE "games/pong.asm"

; ==================================================================
; END OF KERNEL
; ==================================================================