[Qemu-devel] [PATCH 02/29] Add API to check whether a physical address is I/O address

[Luiz Capitulino]

From: Wen Congyang <address@hidden>

This API will be used in the following patch.

Signed-off-by: Wen Congyang <address@hidden>
Signed-off-by: Luiz Capitulino <address@hidden>
---
 cpu-common.h |  4 ++++
 exec.c       | 12 ++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/cpu-common.h b/cpu-common.h
index dca5175..1fe3280 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -71,6 +71,10 @@ 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);
 
+#ifndef CONFIG_USER_ONLY
+bool cpu_physical_memory_is_io(target_phys_addr_t phys_addr);
+#endif
+
 /* 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 a0494c7..1b65859 100644
--- a/exec.c
+++ b/exec.c
@@ -4336,3 +4336,15 @@ bool virtio_is_big_endian(void)
 }
 
 #endif
+
+#ifndef CONFIG_USER_ONLY
+bool cpu_physical_memory_is_io(target_phys_addr_t phys_addr)
+{
+    MemoryRegionSection *section;
+
+    section = phys_page_find(phys_addr >> TARGET_PAGE_BITS);
+
+    return !(memory_region_is_ram(section->mr) ||
+             memory_region_is_romd(section->mr));
+}
+#endif
-- 
1.7.10.2.565.gbd578b5