Re: [SeaBIOS] Little help with call32

[Kevin O'Connor]

On Mon, Apr 23, 2012 at 03:51:10PM +0900, Daniel Castro wrote:
> Hello All,
>
> I have a small problem with call32, after I make the call and the
> 32bit code is executed the parameter I am sending is incorrect, so
> evidently I am doing something incorrect.
>
> Here is my 16bit code:
>    dprintf(1,"Operation 16bit drive at %p\n",op->drive_g);
>    extern void _cfunc32flat_xen_blk_op_read(struct disk_op_s *);
>    return call32(_cfunc32flat_xen_blk_op_read,op,DISK_RET_EPARAM);

The 'op' structure is on the stack and the pointer is therefore
relative to the stack segment.  Use MAKE_FLATPTR to construct a 32bit
pointer - see pci_writel() for an example.

-Kevin

Little help with call32

[Daniel Castro]

On Tue, Apr 24, 2012 at 8:33 AM, Kevin O'Connor  wrote:
> On Mon, Apr 23, 2012 at 03:51:10PM +0900, Daniel Castro wrote:
> > Hello All,
> >
> > I have a small problem with call32, after I make the call and the
> > 32bit code is executed the parameter I am sending is incorrect, so
> > evidently I am doing something incorrect.
> >
> > Here is my 16bit code:
> >       dprintf(1,"Operation 16bit drive at %p\n",op->drive_g);
> >       extern void _cfunc32flat_xen_blk_op_read(struct disk_op_s *);
> >       return call32(_cfunc32flat_xen_blk_op_read,op,DISK_RET_EPARAM);
>
> The 'op' structure is on the stack and the pointer is therefore
> relative to the stack segment.  Use MAKE_FLATPTR to construct a 32bit
> pointer - see pci_writel() for an example.

Thanks
> -Kevin