[Qemu-devel] [PATCH v4 04/15] pci: record which is written into pci configuration space

[Isaku Yamahata]

record which is written into pci configuration space.
introduce helper function to zero PCIDevice::written.
They will be used later.

Signed-off-by: Isaku Yamahata <yamah...@valinux.co.jp>
---
 hw/pci.c |   10 ++++++++++
 hw/pci.h |    5 +++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index 5954476..eca9324 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -627,6 +627,7 @@ static void pci_config_alloc(PCIDevice *pci_dev)
     pci_dev->cmask = qemu_mallocz(config_size);
     pci_dev->wmask = qemu_mallocz(config_size);
     pci_dev->w1cmask = qemu_mallocz(config_size);
+    pci_dev->written = qemu_mallocz(config_size);
     pci_dev->used = qemu_mallocz(config_size);
 }
 
@@ -636,6 +637,7 @@ static void pci_config_free(PCIDevice *pci_dev)
     qemu_free(pci_dev->cmask);
     qemu_free(pci_dev->wmask);
     qemu_free(pci_dev->w1cmask);
+    qemu_free(pci_dev->written);
     qemu_free(pci_dev->used);
 }
 
@@ -1002,6 +1004,8 @@ void pci_default_write_config(PCIDevice *d, uint32_t 
addr, uint32_t val, int l)
         assert(!(wmask & w1cmask));
         d->config[addr + i] = (d->config[addr + i] & ~wmask) | (val & wmask);
         d->config[addr + i] &= ~(val & w1cmask); /* W1C: Write 1 to Clear */
+        d->written[addr + i] = val; /* record what is written for driver
+                                       specific code */
     }
     if (ranges_overlap(addr, l, PCI_BASE_ADDRESS_0, 24) ||
         ranges_overlap(addr, l, PCI_ROM_ADDRESS, 4) ||
@@ -1013,6 +1017,12 @@ void pci_default_write_config(PCIDevice *d, uint32_t 
addr, uint32_t val, int l)
         pci_update_irq_disabled(d, was_irq_disabled);
 }
 
+void pci_clear_written_write_config(PCIDevice *d,
+                                    uint32_t addr, uint32_t val, int l)
+{
+    memset(d->written + addr, 0, l);
+}
+
 /***********************************************************/
 /* generic PCI irq support */
 
diff --git a/hw/pci.h b/hw/pci.h
index eafa9f3..7097817 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -132,6 +132,9 @@ struct PCIDevice {
     /* Used to implement RW1C(Write 1 to Clear) bytes */
     uint8_t *w1cmask;
 
+    /* Used to record what value is written */
+    uint8_t *written;
+
     /* Used to allocate config space for capabilities. */
     uint8_t *used;
 
@@ -200,6 +203,8 @@ uint32_t pci_default_read_config(PCIDevice *d,
                                  uint32_t address, int len);
 void pci_default_write_config(PCIDevice *d,
                               uint32_t address, uint32_t val, int len);
+void pci_clear_written_write_config(PCIDevice *d,
+                                    uint32_t addr, uint32_t val, int l);
 void pci_device_save(PCIDevice *s, QEMUFile *f);
 int pci_device_load(PCIDevice *s, QEMUFile *f);
 
-- 
1.7.1.1