[Qemu-devel] [RFC][PATCH 4/5 v2] Add API to get memory mapping

[Wen Congyang <wency@cn.fujitsu.com>]

Add API to get all virtual address and physical address mapping.
If there is no virtual address for some physical address, the virtual
address is 0.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 memory_mapping.c |   53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 memory_mapping.h |    1 +
 2 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/memory_mapping.c b/memory_mapping.c
index d83b7d7..6c1778c 100644
--- a/memory_mapping.c
+++ b/memory_mapping.c
@@ -128,3 +128,56 @@ void free_memory_mapping_list(MemoryMappingList *list)
 
     list->num = 0;
 }
+
+void get_memory_mapping(MemoryMappingList *list)
+{
+    CPUState *env;
+    MemoryMapping *memory_mapping;
+    RAMBlock *block;
+    ram_addr_t offset, length;
+
+    for (env = first_cpu; env != NULL; env = env->next_cpu) {
+        cpu_get_memory_mapping(list, env);
+    }
+
+    /* some memory may be not mapped, add them into memory mapping's list */
+    QLIST_FOREACH(block, &ram_list.blocks, next) {
+        offset = block->offset;
+        length = block->length;
+
+        QTAILQ_FOREACH(memory_mapping, &list->head, next) {
+            if (memory_mapping->phys_addr >= (offset + length)) {
+                /*
+                 * memory_mapping'list does not conatin the region
+                 * [offset, offset+length)
+                 */
+                create_new_memory_mapping(list, offset, 0, length);
+                break;
+            }
+
+            if ((memory_mapping->phys_addr + memory_mapping->length) <=
+                offset) {
+                continue;
+            }
+
+            if (memory_mapping->phys_addr > offset) {
+                /*
+                 * memory_mapping'list does not conatin the region
+                 * [offset, memory_mapping->phys_addr)
+                 */
+                create_new_memory_mapping(list, offset, 0,
+                                          memory_mapping->phys_addr - offset);
+            }
+
+            if ((offset + length) <=
+                (memory_mapping->phys_addr + memory_mapping->length)) {
+                break;
+            }
+            length -= memory_mapping->phys_addr + memory_mapping->length -
+                      offset;
+            offset = memory_mapping->phys_addr + memory_mapping->length;
+        }
+    }
+
+    return;
+}
diff --git a/memory_mapping.h b/memory_mapping.h
index 871591d..9a876b7 100644
--- a/memory_mapping.h
+++ b/memory_mapping.h
@@ -25,5 +25,6 @@ void add_to_memory_mapping(MemoryMappingList *list,
                            ram_addr_t length);
 
 void free_memory_mapping_list(MemoryMappingList *list);
+void get_memory_mapping(MemoryMappingList *list);
 
 #endif
-- 
1.7.1