vtd: Make some pci access functions architecture independent.

Signed-off-by: Anthony Xu <anthony.xu@intel.com>
Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>

xen/arch/x86/pci.c

@@ -1,12 +1,9 @@
 /******************************************************************************
  * pci.c
  * 
- * PCI access functions.
+ * Architecture-dependent PCI access functions.
  */
 
-#include <xen/config.h>
-#include <xen/pci.h>
-#include <xen/pci_regs.h>
 #include <xen/spinlock.h>
 #include <asm/io.h>
 
@@ -118,59 +115,3 @@ void pci_conf_write32(
     pci_conf_write(PCI_CONF_ADDRESS(bus, dev, func, reg), 0, 4, data);
 }
 
-int pci_find_cap_offset(u8 bus, u8 dev, u8 func, u8 cap)
-{
-    u8 id;
-    int max_cap = 48;
-    u8 pos = PCI_CAPABILITY_LIST;
-    u16 status;
-
-    status = pci_conf_read16(bus, dev, func, PCI_STATUS);
-    if ( (status & PCI_STATUS_CAP_LIST) == 0 )
-        return 0;
-
-    while ( max_cap-- )
-    {
-        pos = pci_conf_read8(bus, dev, func, pos);
-        if ( pos < 0x40 )
-            break;
-
-        pos &= ~3;
-        id = pci_conf_read8(bus, dev, func, pos + PCI_CAP_LIST_ID);
-
-        if ( id == 0xff )
-            break;
-        else if ( id == cap )
-            return pos;
-
-        pos += PCI_CAP_LIST_NEXT;
-    }
-
-    return 0;
-}
-
-int pci_find_next_cap(u8 bus, unsigned int devfn, u8 pos, int cap)
-{
-    u8 id;
-    int ttl = 48;
-
-    while ( ttl-- )
-    {
-        pos = pci_conf_read8(bus, PCI_SLOT(devfn), PCI_FUNC(devfn), pos);
-        if ( pos < 0x40 )
-            break;
-
-        pos &= ~3;
-        id = pci_conf_read8(bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
-                            pos + PCI_CAP_LIST_ID);
-
-        if ( id == 0xff )
-            break;
-        if ( id == cap )
-            return pos;
-
-        pos += PCI_CAP_LIST_NEXT;
-    }
-    return 0;
-}
-

xen/drivers/Makefile

@@ -1,5 +1,6 @@
 subdir-y += char
 subdir-y += cpufreq
+subdir-y += pci
 subdir-$(x86) += passthrough
 subdir-$(HAS_ACPI) += acpi
 subdir-$(HAS_VGA) += video

xen/drivers/pci/Makefile

@@ -0,0 +1 @@
+obj-y += pci.o

xen/drivers/pci/pci.c

@@ -0,0 +1,64 @@
+/******************************************************************************
+ * pci.c
+ *
+ * Architecture-independent PCI access functions.
+ */
+
+#include <xen/pci.h>
+#include <xen/pci_regs.h>
+
+int pci_find_cap_offset(u8 bus, u8 dev, u8 func, u8 cap)
+{
+    u8 id;
+    int max_cap = 48;
+    u8 pos = PCI_CAPABILITY_LIST;
+    u16 status;
+
+    status = pci_conf_read16(bus, dev, func, PCI_STATUS);
+    if ( (status & PCI_STATUS_CAP_LIST) == 0 )
+        return 0;
+
+    while ( max_cap-- )
+    {
+        pos = pci_conf_read8(bus, dev, func, pos);
+        if ( pos < 0x40 )
+            break;
+
+        pos &= ~3;
+        id = pci_conf_read8(bus, dev, func, pos + PCI_CAP_LIST_ID);
+
+        if ( id == 0xff )
+            break;
+        else if ( id == cap )
+            return pos;
+
+        pos += PCI_CAP_LIST_NEXT;
+    }
+
+    return 0;
+}
+
+int pci_find_next_cap(u8 bus, unsigned int devfn, u8 pos, int cap)
+{
+    u8 id;
+    int ttl = 48;
+
+    while ( ttl-- )
+    {
+        pos = pci_conf_read8(bus, PCI_SLOT(devfn), PCI_FUNC(devfn), pos);
+        if ( pos < 0x40 )
+            break;
+
+        pos &= ~3;
+        id = pci_conf_read8(bus, PCI_SLOT(devfn), PCI_FUNC(devfn),
+                            pos + PCI_CAP_LIST_ID);
+
+        if ( id == 0xff )
+            break;
+        if ( id == cap )
+            return pos;
+
+        pos += PCI_CAP_LIST_NEXT;
+    }
+    return 0;
+}