PCI: Mask writes to RO bits in the command reg of PCI config space

The Command register in the PCI config space has some read-only bits.
Any writes to those bits should be masked out.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6092 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 5 insertions, 0 deletions

diff --git a/hw/pci.h b/hw/pci.h
index 95905db1ec..3b1caf5ca8 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -69,6 +69,11 @@ typedef struct PCIIORegion {
 
 #define PCI_STATUS_RESERVED_MASK_HI (PCI_STATUS_DEVSEL >> 8)
 
+/* Bits in the PCI Command Register (PCI 2.3 spec) */
+#define PCI_COMMAND_RESERVED	0xf800
+
+#define PCI_COMMAND_RESERVED_MASK_HI (PCI_COMMAND_RESERVED >> 8)
+
 struct PCIDevice {
     /* PCI config space */
     uint8_t config[256];