[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