[Qemu-devel] [RFC 01/10] isa: Allow to un-assign I/O ports

[Andreas Färber]

Signed-off-by: Andreas Färber <address@hidden>
---
 hw/isa-bus.c |   14 ++++++++++++++
 hw/isa.h     |    1 +
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/hw/isa-bus.c b/hw/isa-bus.c
index 2765543..46716ad 100644
--- a/hw/isa-bus.c
+++ b/hw/isa-bus.c
@@ -105,6 +105,20 @@ void isa_init_ioport(ISADevice *dev, uint16_t ioport)
     isa_init_ioport_range(dev, ioport, 1);
 }
 
+void isa_discard_ioport_range(ISADevice *dev, uint16_t start, uint16_t length)
+{
+    int i, j;
+    for (i = 0; i < dev->nioports; i++) {
+        if (dev->ioports[i] == start) {
+            for (j = 0; j < dev->nioports - i; j++) {
+                dev->ioports[i + j] = dev->ioports[i + length + j];
+            }
+            dev->nioports -= length;
+            break;
+        }
+    }
+}
+
 static int isa_qdev_init(DeviceState *qdev, DeviceInfo *base)
 {
     ISADevice *dev = DO_UPCAST(ISADevice, qdev, qdev);
diff --git a/hw/isa.h b/hw/isa.h
index d2b6126..1b41a27 100644
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -30,6 +30,7 @@ qemu_irq isa_get_irq(int isairq);
 void isa_init_irq(ISADevice *dev, qemu_irq *p, int isairq);
 void isa_init_ioport(ISADevice *dev, uint16_t ioport);
 void isa_init_ioport_range(ISADevice *dev, uint16_t start, uint16_t length);
+void isa_discard_ioport_range(ISADevice *dev, uint16_t start, uint16_t length);
 void isa_qdev_register(ISADeviceInfo *info);
 ISADevice *isa_create(const char *name);
 ISADevice *isa_try_create(const char *name);
-- 
1.7.5.3