[Qemu-devel] [PATCH 4/4] pci: clean up of pci status register

[Isaku Yamahata]

This patch refine the initialization/reset of
pci status registers.

Signed-off-by: Isaku Yamahata <yamah...@valinux.co.jp>
---
 hw/pci.c |   40 ++++++++++++++++++++++++++++++++++++++--
 1 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index a16e763..184db6c 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -154,6 +154,9 @@ static void pci_device_reset(PCIDevice *dev)
     pci_word_test_and_clear_mask(dev->config + PCI_COMMAND,
                                  pci_get_word(dev->wmask + PCI_COMMAND) |
                                  pci_get_word(dev->w1cmask + PCI_COMMAND));
+    pci_word_test_and_clear_mask(dev->config + PCI_STATUS,
+                                 pci_get_word(dev->wmask + PCI_STATUS) |
+                                 pci_get_word(dev->w1cmask + PCI_STATUS));
     dev->config[PCI_CACHE_LINE_SIZE] = 0x0;
     dev->config[PCI_INTERRUPT_LINE] = 0x0;
     for (r = 0; r < PCI_NUM_REGIONS; ++r) {
@@ -636,7 +639,7 @@ static void pci_init_cmask(PCIDevice *dev)
     dev->cmask[PCI_CAPABILITY_LIST] = 0xff;
 }
 
-static void pci_init_wmask(PCIDevice *dev)
+static void pci_init_wmask_w1cmask(PCIDevice *dev)
 {
     int config_size = pci_config_size(dev);
 
@@ -691,6 +694,39 @@ static void pci_init_wmask(PCIDevice *dev)
                  PCI_COMMAND_MASTER | PCI_COMMAND_PARITY | PCI_COMMAND_SERR |
                  PCI_COMMAND_INTX_DISABLE);
 
+    /*
+     * bit 0-2: reserved
+     * bit 3: PCI_STATUS_INTERRUPT: RO
+     * bit 4: PCI_STATUS_CAP_LIST: RO
+     * bit 5: PCI_STATUS_66MHZ: RO
+     * bit 6: PCI_STATUS_UDF: reserved (PCI 2.2-)
+     * bit 7: PCI_STATUS_FAST_BACK: RO
+     * bit 8: PCI_STATUS_PARITY
+     *        type 0: RW for bus master
+     *        type 1: RW1C
+     * bit 9-10: PCI_STATUS_DEVSEL: RO
+     * bit 11: PCI_STATUS_SIG_TARGET_ABORT
+     *         type 0: RW1C for targets that is capable of terminating
+     *                 a transaction.
+     *         type 1: RW1C
+     * bit 12: PCI_STATUS_REC_TARGET_ABORT
+     *         type 0: RW1C for masters
+     *         type 1: RW1C
+     * bit 13: PCI_STATUS_REC_MASTER_ABORT
+     *         type 0: RW1C for masters
+     *         type 1: RW1C
+     * bit 14: PCI_STATUS_SIG_SYSTEM_ERROR
+     *         type 0: RW1C with execptions
+     *         type 1: RW1C
+     * bit : PCI_STATUS_DETECTED_PARITY: RW1C
+     *
+     * It's safe to set w1mask even for RO.
+     */
+    pci_set_word(dev->w1cmask + PCI_STATUS,
+                 PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT |
+                 PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_REC_MASTER_ABORT |
+                 PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY);
+
     memset(dev->wmask + PCI_CONFIG_HEADER_SIZE, 0xff,
            config_size - PCI_CONFIG_HEADER_SIZE);
 }
@@ -821,7 +857,7 @@ static PCIDevice *do_pci_register_device(PCIDevice 
*pci_dev, PCIBus *bus,
         pci_set_default_subsystem_id(pci_dev);
     }
     pci_init_cmask(pci_dev);
-    pci_init_wmask(pci_dev);
+    pci_init_wmask_w1cmask(pci_dev);
     if (is_bridge) {
         pci_init_wmask_bridge(pci_dev);
     }
-- 
1.7.1.1