Re: [Qemu-devel] [RFC][PATCH 08/15] isa: implement isa_is_ioport_assigned via memory_region_find

[Paolo Bonzini <pbonzini@redhat.com>]

Il 06/05/2013 16:55, Andreas Färber ha scritto:
> Am 06.05.2013 16:26, schrieb Jan Kiszka:
>> Move isa_is_ioport_assigned to the ISA core and implement it via a
>> memory region lookup. As all IO ports are now directly or indirectly
>> registered via the memory API, this becomes possible and will finally
>> allow us to drop the ioport tables.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
>> ---
>>  hw/acpi/piix4.c       |    6 +++---
>>  hw/isa/isa-bus.c      |   11 +++++++++++
>>  hw/isa/lpc_ich9.c     |    8 ++++----
>>  include/exec/ioport.h |    1 -
>>  include/hw/isa/isa.h  |    2 ++
>>  ioport.c              |    7 -------
>>  6 files changed, 20 insertions(+), 15 deletions(-)
>>
>> diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
>> index c4af1cc..5955217 100644
>> --- a/hw/acpi/piix4.c
>> +++ b/hw/acpi/piix4.c
>> @@ -386,10 +386,10 @@ static void piix4_pm_machine_ready(Notifier *n, void *opaque)
>>      uint8_t *pci_conf;
>>  
>>      pci_conf = s->dev.config;
>> -    pci_conf[0x5f] = (isa_is_ioport_assigned(0x378) ? 0x80 : 0) | 0x10;
>> +    pci_conf[0x5f] = (isa_is_ioport_assigned(NULL, 0x378) ? 0x80 : 0) | 0x10;
>>      pci_conf[0x63] = 0x60;
>> -    pci_conf[0x67] = (isa_is_ioport_assigned(0x3f8) ? 0x08 : 0) |
>> -	(isa_is_ioport_assigned(0x2f8) ? 0x90 : 0);
>> +    pci_conf[0x67] = (isa_is_ioport_assigned(NULL, 0x3f8) ? 0x08 : 0) |
>> +        (isa_is_ioport_assigned(NULL, 0x2f8) ? 0x90 : 0);
>>  
>>  }
>>  
> 
> Is there really no way to access the ISABus from this device? Would be
> nice to get rid of global ISA variables and not introduce more
> dependencies. :)

There's always a way to find the ISABus via QOM:

    ISABus *isa_bus = (ISABus *) object_resolve_path_type("", TYPE_ISA_BUS, NULL);

Paolo