- Pass through some value of the real host in case of intel graphic

    card. The graphic card need the know how much merroy has been stolen
    from the physical RAM.

diff --git a/hw/pci.c b/hw/pci.c
index 1de68fddd137c204b1806728bb9b60c614592378..067fd0cfb15bd17fb3657aa766ac5906486dafd2 100644 (file)
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -25,6 +25,7 @@
 #include "pci.h"
 #include "console.h"
 #include "net.h"
+#include "pass-through.h"
 
 //#define DEBUG_PCI
 
@@ -52,6 +53,8 @@ static void pci_set_irq(void *opaque, int irq_num, int level);
 target_phys_addr_t pci_mem_base;
 static PCIBus *first_bus;
 
+extern int vga_passthrough;
+
 static int pcibus_load(QEMUFile *f, void *opaque, int version_id)
 {
     int i, nirq;
@@ -441,7 +444,7 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
     PCIBus *s = opaque;
     PCIDevice *pci_dev;
     int config_addr, bus_num;
-    uint32_t val;
+    uint32_t val = 0;
 
     bus_num = (addr >> 16) & 0xff;
     while (s && s->bus_num != bus_num)
@@ -466,6 +469,19 @@ uint32_t pci_data_read(void *opaque, uint32_t addr, int len)
         goto the_end;
     }
     config_addr = addr & 0xff;
+
+
+    if (vga_passthrough && pci_dev->devfn == 0x00) //Host Bridge
+    {
+        if (config_addr == 0x52) // GMCH
+            val = pt_pci_host_read_word(0, 0, 0, 0x52);
+        if (config_addr == 0xa0) // Top of memory
+            val = pt_pci_host_read_byte(0, 0, 0, 0xa0);
+        if (config_addr == 0x02) // Device ID
+            val = pt_pci_host_read_byte(0, 0, 0, 0x02);
+        goto the_end;
+    }
+
     val = pci_dev->config_read(pci_dev, config_addr, len);
 #if defined(DEBUG_PCI)
     printf("pci_config_read: %s: addr=%02x val=%08x len=%d\n",