Initial revision

contrib/hdload/hdload.S

@@ -0,0 +1,162 @@
+#if	!defined(USE_NASM) && !defined(USE_AS86)
+#define	USE_AS86
+#endif
+
+#ifdef	USE_AS86
+#define	CON(x)		*x
+#define	BCON(x)		*x
+#define	WCON(x)		*x
+#define	LOC(x)		x
+#define	BLOC(x)		byte ptr x
+#define	WLOC(x)		word ptr x
+#define	JMP(x)		jmp x
+#define	STRDECL(s)	.ascii	s
+#define	SEGCS		seg	cs
+#define	SEGES		seg	es
+#define	ALIGN(x)	.align	x
+#define	SPACE(x)	.space	x
+#endif
+
+#ifdef	USE_NASM
+#define	CON(x)		x
+#define	BCON(x)		byte x
+#define	WCON(x)		word x
+#define	LOC(x)		[x]
+#define	BLOC(x)		byte [x]
+#define	WLOC(x)		word [x]
+#define	JMP(x)		jmp short x
+#define	STRDECL(s)	db	s
+#define	SEGCS		cs
+#define	SEGES		es
+#define	ALIGN(x)	align x, db 0
+#define	SPACE(x)	times x db 0
+#endif
+
+ROMLOAD	equ	0x5000
+
+start:
+	cli
+	xor	ax, ax
+	mov	ss, ax
+	mov	sp, CON(0x7C00)
+	mov	si, sp
+	mov	es, ax
+	mov	ds, ax
+	sti
+	cld
+	mov	di, CON(0x600)
+	mov	cx, CON(0x100)
+	rep
+	movsw
+	db	0xEA
+	dw	jump
+	dw	0
+jump:
+	mov	si, CON(Hlaska)
+	call	print
+
+        ; rozmery prvniho HD
+        mov     ah, CON(8)
+        mov     dl, CON(0x80)
+        int     0x13
+        jc      chyba
+        ; dh - H, cx - CS
+
+        ; prvi stopa obsahuje bootrom, tak ji natahneme do RAM
+        mov     ah, CON(2)
+        mov     al, cl
+        and     al, CON(0x3F)
+        dec     al
+        mov     dx, CON(0x80)
+        mov     cx, CON(2)
+        mov     bx, CON(ROMLOAD)
+        mov     es, bx
+        xor     bx, bx
+        int     0x13
+        jc      chyba
+
+        ; hromada kodu podle zdrojaku netboot
+        xor     di, di
+        mov     es, di
+        mov     di, CON(0x380)
+        push    di
+        mov     cx, CON(10)
+        cld
+        rep
+	stosw
+        pop     di
+#ifdef	USE_AS86
+        mov     word ptr [ di ], CON(0x5a5a)
+        mov     byte ptr [ di + 2 ], CON(0x50)
+        mov     word ptr [ di + 0x10 ], CON(0xFFFF)
+        mov     word ptr [ di + 0x12 ], CON(0xFFFF)
+#endif
+#ifdef	USE_NASM
+        mov     word [ di ], CON(0x5a5a)
+        mov     byte [ di + 2 ], CON(0x50)
+        mov     word [ di + 10h ], CON(0xFFFF)
+        mov     word [ di + 12h ], CON(0xFFFF)
+#endif
+
+        ; navratova adresa, kdyby nezabrala ROM
+	SEGCS
+        mov	WLOC(OfsErr), CON(RomErr)
+        push    cs
+        push    WCON(chyba)
+        mov     ax, CON(ROMLOAD)
+        mov     es, ax
+        push    es
+        ; kouzelny jump....
+	SEGES
+        mov     si, [ 0x1a ]
+	SEGES
+#ifdef	USE_AS86
+        push    word ptr [ si + 0x1a ] ; ...do bootrom v RAM
+#endif
+#ifdef	USE_NASM
+        push    word [ si + 0x1a ] ; ...do bootrom v RAM
+#endif
+        retf
+
+chyba:
+	SEGCS
+	mov	si, LOC(OfsErr)
+	call	print
+        mov     si, CON(CRLF)
+	call	print
+        JMP(chyba)
+
+print:
+	lodsb
+	cmp	al,CON(0)
+	je	navrat
+	push	si
+	mov	bx,CON(7)
+	mov	ah,CON(0x0E)
+	int	0x10
+	pop	si
+	JMP(print)
+
+navrat:
+	ret
+
+Hlaska:	db	13, 10
+	STRDECL('HD Net Loader v1.0 (c) poli 1999')
+	db	13, 10, 0
+CRLF:	db	13, 10, 0
+OfsErr:	dw	Error
+Error:	STRDECL('Error load from HD !')
+	db	0
+RomErr:	STRDECL('ROM Error !')
+	db	0
+
+mbrend:
+	ret
+
+#ifdef  USE_AS86
+	org     510
+#endif
+#ifdef  USE_NASM
+	times   510-($-$$) db 0
+#endif
+        dw	0xAA55