Re: [Qemu-devel] [PATCH 02/14] isa: Add isa_register_old_portio_list().

[Avi Kivity <avi@redhat.com>]

On 08/17/2011 06:45 AM, Avi Kivity wrote:
>
>> +{
>> +    MemoryRegion *io_space = isabus->address_space_io;
>> +    const MemoryRegionPortio *pio_iter;
>> +
>> +    /* START is how we should treat DEV, regardless of the actual
>> +       contents of the portio array.  This is how the old code
>> +       actually handled e.g. the FDC device.  */
>> +    if (dev) {
>> +        isa_init_ioport(dev, start);
>> +    }
>> +
>> +    for (; pio_start->size != 0; pio_start = pio_iter + 1) {
>> +        unsigned int off_low = UINT_MAX, off_high = 0;
>> +        MemoryRegionOps *ops;
>> +        MemoryRegion *region;
>> +
>> +        for (pio_iter = pio_start; pio_iter->size; ++pio_iter) {
>> +            if (pio_iter->offset<  off_low) {
>> +                off_low = pio_iter->offset;
>> +            }
>> +            if (pio_iter->offset + pio_iter->len>  off_high) {
>> +                off_high = pio_iter->offset + pio_iter->len;
>> +            }
>
> This is supposed to pick up MRPs that are for the same port address?  
> If so that should be in the loop termination condition.

Oh, after seeing a user I see how it works now.  But can't we derive 
this information instead of forcing the user to specify it?

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.