vga: Expose framebuffer byteorder as a QOM property

The VGA device model now supports having the framebuffer in either endian,
and can be switched between these by the guest via a register in the qext
region.

However, in some cases (e.g. LE OS on the pseries machine) we have
existing guest that don't know about the endian switch register, but other
parts of the qemu code have better information to set a default endianness
than the VGA code does of itself.

In order to allow them to set a correct default endianness in these cases,
without breaking abstraction walls, this patch exposes the VGA framebuffer
endianness via a writable QOM property.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
[agraf: use instance_init for property exposure]
Signed-off-by: Alexander Graf <agraf@suse.de>

hw/display/vga-pci.c

@@ -181,6 +181,20 @@ static void pci_vga_qext_write(void *ptr, hwaddr addr,
     }
 }
 
+static bool vga_get_big_endian_fb(Object *obj, Error **errp)
+{
+    PCIVGAState *d = DO_UPCAST(PCIVGAState, dev, PCI_DEVICE(obj));
+
+    return d->vga.big_endian_fb;
+}
+
+static void vga_set_big_endian_fb(Object *obj, bool value, Error **errp)
+{
+    PCIVGAState *d = DO_UPCAST(PCIVGAState, dev, PCI_DEVICE(obj));
+
+    d->vga.big_endian_fb = value;
+}
+
 static const MemoryRegionOps pci_vga_qext_ops = {
     .read = pci_vga_qext_read,
     .write = pci_vga_qext_write,
@@ -234,6 +248,13 @@ static void pci_std_vga_realize(PCIDevice *dev, Error **errp)
     }
 }
 
+static void pci_std_vga_init(Object *obj)
+{
+    /* Expose framebuffer byteorder via QOM */
+    object_property_add_bool(obj, "big-endian-framebuffer",
+                             vga_get_big_endian_fb, vga_set_big_endian_fb, NULL);
+}
+
 static void pci_secondary_vga_realize(PCIDevice *dev, Error **errp)
 {
     PCIVGAState *d = DO_UPCAST(PCIVGAState, dev, dev);
@@ -265,7 +286,13 @@ static void pci_secondary_vga_realize(PCIDevice *dev, Error **errp)
 
     pci_register_bar(&d->dev, 0, PCI_BASE_ADDRESS_MEM_PREFETCH, &s->vram);
     pci_register_bar(&d->dev, 2, PCI_BASE_ADDRESS_SPACE_MEMORY, &d->mmio);
+}
 
+static void pci_secondary_vga_init(Object *obj)
+{
+    /* Expose framebuffer byteorder via QOM */
+    object_property_add_bool(obj, "big-endian-framebuffer",
+                             vga_get_big_endian_fb, vga_set_big_endian_fb, NULL);
 }
 
 static void pci_secondary_vga_reset(DeviceState *dev)
@@ -324,13 +351,15 @@ static void secondary_class_init(ObjectClass *klass, void *data)
 static const TypeInfo vga_info = {
     .name          = "VGA",
     .parent        = TYPE_PCI_DEVICE,
+    .instance_init = pci_std_vga_init,
     .instance_size = sizeof(PCIVGAState),
     .class_init    = vga_class_init,
 };
 
 static const TypeInfo secondary_info = {
     .name          = "secondary-vga",
     .parent        = TYPE_PCI_DEVICE,
+    .instance_init = pci_secondary_vga_init,
     .instance_size = sizeof(PCIVGAState),
     .class_init    = secondary_class_init,
 };