[Qemu-devel] [PATCH v1 1/3] add memory_region_get_offset_within_address_space

[KONRAD Frederic <frederic.konrad@adacore.com>]

This is helpful in the next patch to know if a rom is pointed by an alias.

Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
---
 include/exec/memory.h | 10 ++++++++++
 memory.c              | 22 ++++++++++++++++++++--
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 8503685..e342412 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1270,6 +1270,16 @@ void memory_region_set_size(MemoryRegion *mr, uint64_t size);
 void memory_region_set_alias_offset(MemoryRegion *mr,
                                     hwaddr offset);
 
+/*
+ * memory_region_get_offset_within_address_space: get the offset of a region
+ *
+ * Returns the offset of a region within its address space. @mr must be mapped
+ * to an #AddressSpace.
+ *
+ * @mr: the #MemoryRegion to check.
+ */
+hwaddr memory_region_get_offset_within_address_space(MemoryRegion *mr);
+
 /**
  * memory_region_present: checks if an address relative to a @container
  * translates into #MemoryRegion within @container
diff --git a/memory.c b/memory.c
index 1044bba..2b7439b 100644
--- a/memory.c
+++ b/memory.c
@@ -598,11 +598,18 @@ static MemTxResult access_with_adjusted_size(hwaddr addr,
     return r;
 }
 
-static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
+static AddressSpace *memory_region_to_address_space(MemoryRegion *mr,
+                                                    hwaddr *offset)
 {
     AddressSpace *as;
 
+    if (offset) {
+        *offset = 0;
+    }
     while (mr->container) {
+        if (offset) {
+            *offset += mr->addr;
+        }
         mr = mr->container;
     }
     QTAILQ_FOREACH(as, &address_spaces, address_spaces_link) {
@@ -613,6 +620,17 @@ static AddressSpace *memory_region_to_address_space(MemoryRegion *mr)
     return NULL;
 }
 
+hwaddr memory_region_get_offset_within_address_space(MemoryRegion *mr)
+{
+    hwaddr offset;
+    AddressSpace *as;
+
+    as = memory_region_to_address_space(mr, &offset);
+    assert(as);
+
+    return offset;
+}
+
 /* Render a memory region into the global view.  Ranges in @view obscure
  * ranges in @mr.
  */
@@ -2251,7 +2269,7 @@ static MemoryRegionSection memory_region_find_rcu(MemoryRegion *mr,
         addr += root->addr;
     }
 
-    as = memory_region_to_address_space(root);
+    as = memory_region_to_address_space(root, NULL);
     if (!as) {
         return ret;
     }
-- 
1.8.3.1