Changeset 26864 in vbox for trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c

Timestamp:

Feb 26, 2010 3:39:29 PM (15 years ago)

Author:

vboxsync

Message:

Runtime/r0drv/memobj-linux: alignment for rtR0MemObjNativeAllocPhys()

File:

• trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c (modified) (2 diffs)

trunk/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c

@@ -702 +702 @@
 int rtR0MemObjNativeAllocPhys(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment)
 {
-    /** @todo alignment */
-    if (uAlignment != PAGE_SIZE)
+    /*
+     * Contiguous physical memory: Check for the alignment of the physical address.
+     * Use the knowledge that we are using alloc_pages(flags, order) for allocating
+     * contiguous physical memory which is always aligned at 2^(PAGE_SHIFT+order).
+     */
+    if (uAlignment > cb)
         return VERR_NOT_SUPPORTED;
 
@@ -712 +716 @@
 int rtR0MemObjNativeAllocPhysNC(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest)
 {
+    /*
+     * Non-contiguous memory.
+     */
     return rtR0MemObjLinuxAllocPhysSub(ppMem, RTR0MEMOBJTYPE_PHYS_NC, cb, PhysHighest);
 }