stuff and things

boot.asm

@@ -0,0 +1,90 @@
+	format binary
+	org 0x7c00
+	use16
+
+	jmp short start
+	nop
+
+	;; reserved for (E)BPB (which BIOS might scramble)
+	;; you could also have one that *could* work
+	times 0x3B db 0
+start:
+
+	;; setup segments
+	;; setup stack
+	;; trust nothing
+	cld
+	mov ax, 0
+	mov ds, ax
+	mov es, ax
+	
+	mov ss, ax
+	mov sp, 0x7c00		;stack down from our load address
+	mov bp, sp
+	
+	;; ensure VGA textmode
+	mov ah, 0x00
+	mov al, 0x03		;Colour Text mode 3 80x25
+	int 0x10
+	
+	;; storeBootdiskNum
+	mov [diskNum], dl
+
+checkLBASupport:
+	;; Set AH = 0x41
+	;; BX = 0x55AA
+	;; DL = drive
+	;; INT 0x13
+
+	mov si, msg.lba
+	mov ah, 0x41
+	mov bx, 0x55AA
+	int 0x13
+
+	jc msg.error
+	test bx, 0xAA55
+	jz msg.error
+	test cx, cx
+	jp msg.error
+
+
+getPartitionLBA:
+	;; 1st partition entry  at 0x1BE (16 bytes)
+	;; LBA start     4bytes at 0x1BE + 0x08
+	;; Sectors count 4bytes at 0x1BE + 0x0C
+
+	;; so uhmmmm, read those and use 'em to find next peace of data?
+	;; Wait is my MBR one block that is read at once? Lol wait MBR
+	;; is also part of my own current loaded memory!
+
+
+
+nomoreThings:
+	mov si, msg.nop
+	jmp msg.ok
+endloop:
+	nop
+	jmp endloop
+	
+msg:
+.ok:
+	mov ah, 0x20		;greenblack
+	jmp .prepare
+.error:
+	mov ah, 0x47		;redgray
+.prepare:
+	mov bx, 0xb800
+	mov es, bx
+	mov edi, 0
+.loop:
+	lodsb
+	test al, al
+	jz endloop
+	stosw
+	jmp .loop
+
+	.lba db "Inadequate LBA support: Ancient computor or floppy?", 0
+	.nop db "Nothingtodo :'(", 0
+
+	;; Store some data
+diskNum db 0x00