[Qemu-devel] [PATCH 1/2] memory: Add MemoryRegion get address space offset helper function

[Bogdan Purcareata <bogdan.purcareata@freescale.com>]

Adding this function would allow a MemoryRegion to compute its start address
within the AddressSpace. This is done recursively based on mr->container.

Signed-off-by: Bogdan Purcareata <bogdan.purcareata@freescale.com>
---
 include/exec/memory.h |    8 ++++++++
 memory.c              |   10 ++++++++++
 2 files changed, 18 insertions(+)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index d165b27..7503819 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -444,6 +444,14 @@ struct Object *memory_region_owner(MemoryRegion *mr);
 uint64_t memory_region_size(MemoryRegion *mr);
 
 /**
+ * memory_region_get_address_space_offset: get a memory region's address
+ * within the address space
+ *
+ * @mr: the memory region being queried.
+ */
+hwaddr memory_region_get_address_space_offset(MemoryRegion *mr);
+
+/**
  * memory_region_is_ram: check whether a memory region is random access
  *
  * Returns %true is a memory region is random access.
diff --git a/memory.c b/memory.c
index ef0be1c..7445032 100644
--- a/memory.c
+++ b/memory.c
@@ -1307,6 +1307,16 @@ uint64_t memory_region_size(MemoryRegion *mr)
     return int128_get64(mr->size);
 }
 
+hwaddr memory_region_get_address_space_offset(MemoryRegion *mr)
+{
+    MemoryRegion *p;
+    hwaddr result = 0x0;
+
+    for (p = mr; p != NULL; result += p->addr, p = p->container);
+
+    return result;
+}
+
 const char *memory_region_name(const MemoryRegion *mr)
 {
     if (!mr->name) {
-- 
1.7.10.4