isa: add creation function that may fail

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

diff --git a/hw/isa-bus.c b/hw/isa-bus.c
index 0cb1afb..6f349a5 100644 (file)
--- a/hw/isa-bus.c
+++ b/hw/isa-bus.c
@@ -146,6 +146,18 @@ ISADevice *isa_create(const char *name)
     return DO_UPCAST(ISADevice, qdev, dev);
 }
 
+ISADevice *isa_try_create(const char *name)
+{
+    DeviceState *dev;
+
+    if (!isabus) {
+        hw_error("Tried to create isa device %s with no isa bus present.",
+                 name);
+    }
+    dev = qdev_try_create(&isabus->qbus, name);
+    return DO_UPCAST(ISADevice, qdev, dev);
+}
+
 ISADevice *isa_create_simple(const char *name)
 {
     ISADevice *dev;

diff --git a/hw/isa.h b/hw/isa.h
index 19aa94c..e26abfa 100644 (file)
--- a/hw/isa.h
+++ b/hw/isa.h
@@ -32,6 +32,7 @@ void isa_init_ioport(ISADevice *dev, uint16_t ioport);
 void isa_init_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);
 ISADevice *isa_create_simple(const char *name);
 
 extern target_phys_addr_t isa_mem_base;