[Qemu-devel] [RFC][PATCH 02/14 v4] Add API to check whether a physical address is I/O address

[Wen Congyang]

This API will be used in the following patch.

Signed-off-by: Wen Congyang <address@hidden>
---
 cpu-common.h |    2 ++
 exec.c       |   20 ++++++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/cpu-common.h b/cpu-common.h
index 3fe44d2..0309137 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -70,6 +70,8 @@ void cpu_physical_memory_unmap(void *buffer, 
target_phys_addr_t len,
 void *cpu_register_map_client(void *opaque, void (*callback)(void *opaque));
 void cpu_unregister_map_client(void *cookie);
 
+bool is_io_addr(target_phys_addr_t phys_addr);
+
 /* Coalesced MMIO regions are areas where write operations can be reordered.
  * This usually implies that write operations are side-effect free.  This 
allows
  * batching which can make a major impact on performance when using
diff --git a/exec.c b/exec.c
index b02199b..227d2ea 100644
--- a/exec.c
+++ b/exec.c
@@ -4688,3 +4688,23 @@ void dump_exec_info(FILE *f, fprintf_function 
cpu_fprintf)
 #undef env
 
 #endif
+
+bool is_io_addr(target_phys_addr_t phys_addr)
+{
+    ram_addr_t pd;
+    PhysPageDesc *p;
+
+    p = phys_page_find(phys_addr >> TARGET_PAGE_BITS);
+    if (!p) {
+        pd = IO_MEM_UNASSIGNED;
+    } else {
+        pd = p->phys_offset;
+    }
+
+    if ((pd & ~TARGET_PAGE_MASK) > IO_MEM_ROM && !(pd & IO_MEM_ROMD)) {
+        /* I/O region */
+        return true;
+    }
+
+    return false;
+}
-- 
1.7.1