[SeaBIOS] Little help with call32

[Daniel Castro]

On Tue, Apr 24, 2012 at 8:33 AM, Kevin O'Connor <kevin at koconnor.net> 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



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