Re: [Qemu-devel] [PATCH 08/23] memory: I/O address space support

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On 07/25/2011 09:02 AM, Avi Kivity wrote:
Allow registering I/O ports via the same mechanism as mmio ranges.

Signed-off-by: Avi Kivity<avi@xxxxxxxxxx>

Reviewed-by: Anthony Liguori <aliguori@xxxxxxxxxx>

Regards,

Anthony Liguori

---
  exec-memory.h |    3 ++
  memory.c      |   60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
  memory.h      |    2 +
  3 files changed, 64 insertions(+), 1 deletions(-)

diff --git a/exec-memory.h b/exec-memory.h
index 7eb9085..aad21b5 100644
--- a/exec-memory.h
+++ b/exec-memory.h
@@ -18,6 +18,9 @@ MemoryRegion *get_system_memory(void);
  /* Set the root memory region.  This region is the system memory map. */
  void set_system_memory_map(MemoryRegion *mr);

+/* Set the I/O memory region.  This region is the I/O memory map. */
+void set_system_io_map(MemoryRegion *mr);
+
  #endif

  #endif
diff --git a/memory.c b/memory.c
index bc8bfa2..62bd60b 100644
--- a/memory.c
+++ b/memory.c
@@ -13,6 +13,7 @@

  #include "memory.h"
  #include "exec-memory.h"
+#include "ioport.h"
  #include<assert.h>

  typedef struct AddrRange AddrRange;
@@ -210,6 +211,52 @@ static AddressSpace address_space_memory = {
      .ops =&address_space_ops_memory,
  };

+static void memory_region_iorange_read(IORange *iorange,
+                                       uint64_t offset,
+                                       unsigned width,
+                                       uint64_t *data)
+{
+    MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
+
+    *data = mr->ops->read(mr->opaque, offset, width);
+}
+
+static void memory_region_iorange_write(IORange *iorange,
+                                        uint64_t offset,
+                                        unsigned width,
+                                        uint64_t data)
+{
+    MemoryRegion *mr = container_of(iorange, MemoryRegion, iorange);
+
+    mr->ops->write(mr->opaque, offset, data, width);
+}
+
+static const IORangeOps memory_region_iorange_ops = {
+    .read = memory_region_iorange_read,
+    .write = memory_region_iorange_write,
+};
+
+static void as_io_range_add(AddressSpace *as, FlatRange *fr)
+{
+    iorange_init(&fr->mr->iorange,&memory_region_iorange_ops,
+                 fr->addr.start,fr->addr.size);
+    ioport_register(&fr->mr->iorange);
+}
+
+static void as_io_range_del(AddressSpace *as, FlatRange *fr)
+{
+    isa_unassign_ioport(fr->addr.start, fr->addr.size);
+}
+
+static const AddressSpaceOps address_space_ops_io = {
+    .range_add = as_io_range_add,
+    .range_del = as_io_range_del,
+};
+
+static AddressSpace address_space_io = {
+    .ops =&address_space_ops_io,
+};
+
  /* Render a memory region into the global view.  Ranges in @view obscure
   * ranges in @mr.
   */
@@ -358,7 +405,12 @@ static void address_space_update_topology(AddressSpace *as)

  static void memory_region_update_topology(void)
  {
-    address_space_update_topology(&address_space_memory);
+    if (address_space_memory.root) {
+        address_space_update_topology(&address_space_memory);
+    }
+    if (address_space_io.root) {
+        address_space_update_topology(&address_space_io);
+    }
  }

  void memory_region_init(MemoryRegion *mr,
@@ -772,3 +824,9 @@ void set_system_memory_map(MemoryRegion *mr)
      address_space_memory.root = mr;
      memory_region_update_topology();
  }
+
+void set_system_io_map(MemoryRegion *mr)
+{
+    address_space_io.root = mr;
+    memory_region_update_topology();
+}
diff --git a/memory.h b/memory.h
index 0994b18..2afbf13 100644
--- a/memory.h
+++ b/memory.h
@@ -9,6 +9,7 @@
  #include "cpu-common.h"
  #include "targphys.h"
  #include "qemu-queue.h"
+#include "iorange.h"

  typedef struct MemoryRegionOps MemoryRegionOps;
  typedef struct MemoryRegion MemoryRegion;
@@ -78,6 +79,7 @@ struct MemoryRegion {
      target_phys_addr_t offset;
      bool backend_registered;
      ram_addr_t ram_addr;
+    IORange iorange;
      bool terminates;
      MemoryRegion *alias;
      target_phys_addr_t alias_offset;

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