[Qemu-devel] [RFC][PATCH 03/15] Add API to check whether a physical address is I/O address

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

This API will be used in the following patch.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
---
 cpu-common.h |    2 ++
 exec.c       |   16 ++++++++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/cpu-common.h b/cpu-common.h
index a40c57d..d047137 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -71,6 +71,8 @@ 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 7f9f730..adc4e74 100644
--- a/exec.c
+++ b/exec.c
@@ -4411,3 +4411,19 @@ tb_page_addr_t get_page_addr_code(CPUState *env1, target_ulong addr)
 #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);
+    pd = p.phys_offset;
+
+    if (!is_ram_rom_romd(pd)) {
+        /* I/O region */
+        return true;
+    }
+
+    return false;
+}
-- 
1.7.1