Implement isa_serial_set_{enabled,iobase} in order to implement relocation and
toggling of SuperI/O functions in the VIA south bridges without breaking
encapsulation.

Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
 include/hw/char/serial.h |  2 ++
 hw/char/serial-isa.c     | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h
index eb4254edde..ba9f8f21d7 100644
--- a/include/hw/char/serial.h
+++ b/include/hw/char/serial.h
@@ -112,5 +112,7 @@ SerialMM *serial_mm_init(MemoryRegion *address_space,
 
 #define TYPE_ISA_SERIAL "isa-serial"
 void serial_hds_isa_init(ISABus *bus, int from, int to);
+void isa_serial_set_iobase(ISADevice *serial, hwaddr iobase);
+void isa_serial_set_enabled(ISADevice *serial, bool enabled);
 
 #endif
diff --git a/hw/char/serial-isa.c b/hw/char/serial-isa.c
index 2be8be980b..d51c9ec87c 100644
--- a/hw/char/serial-isa.c
+++ b/hw/char/serial-isa.c
@@ -187,3 +187,17 @@ void serial_hds_isa_init(ISABus *bus, int from, int to)
         }
     }
 }
+
+void isa_serial_set_iobase(ISADevice *serial, hwaddr iobase)
+{
+    ISASerialState *s = ISA_SERIAL(serial);
+
+    serial->ioport_id = iobase;
+    s->iobase = iobase;
+    memory_region_set_address(&s->io, s->iobase);
+}
+
+void isa_serial_set_enabled(ISADevice *serial, bool enabled)
+{
+    memory_region_set_enabled(&ISA_SERIAL(serial)->io, enabled);
+}
-- 
2.43.0