🚀 go-pugleaf

On 26 Jul 1998 02:37:55 GMT, Marcus Johansson <marcus.johansson@mbox005.swipnet.se> wrote:

Just load it by parts of 64Kb. I don't know how about PM, but in the real mode I use something like this:

	mov	ecx,[filesize]
	mov	ax,[segment]
	mov	ds,ax
Again:
	push	ecx			; Store on stack, how much left to read
	test	ecx,0FFFF0000h	; Less than 64Kb -- than read it
	jz	NotTooMuch
	mov	cx,0FFFFh		; Else read 65535
NotTooMuch:
	<here we read 65535 bytes>	; DOS call  (don't forget BX=FileHandle)
	pop	eax			; Restore the value
	jc	Error			; Any errors?
	sub	eax,cx			; How much left to read?
	jz	Done			; Nothing -- out
	push	ecx
	mov	dx,0FFFFh		; Read one byte to the
	mov	cx,1			; very end of the segment
	<read one more byte>		; DOS call
	pop	ecx
	jc	Error
	dec	ecx			; Nothing left -- then exit
	jz	Done
	mov	ax,ds			; Increase DS by 1000h -- to the next phys. segment
	add	ax,1000h
	mov	ds,ax
	jmp	Again			; "On and on... "
Done:
	. . .
Error:


I don't guarantee you'll be able to use this in PM (I never written progs for PM in asm), but, it's not bad (I don't say
"not buggy")

>I am almoust finsihed with my DPMI loader but I can only load 64kbit
>files, anyone know how to load programs when operating in protectedmode?
>
>The dos routine for loading files seemes to be limited to 64kb so how do
>
>I load larger files, anyone got any code for it? Or suggestions?
>
>Thanks,
>Marcus
>
>

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