[Qemu-devel] [PATCH v4 4/6] register: Add support for decoding information

[Peter Crosthwaite <peter.crosthwaite@xilinx.com>]

Allow defining of optional address decoding information in register
definitions. This is useful for clients that want to associate
registers with specific addresses.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
---

 include/hw/register.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/include/hw/register.h b/include/hw/register.h
index c595ed6..d7f602f 100644
--- a/include/hw/register.h
+++ b/include/hw/register.h
@@ -15,6 +15,7 @@
 
 typedef struct RegisterInfo RegisterInfo;
 typedef struct RegisterAccessInfo RegisterAccessInfo;
+typedef struct RegisterDecodeInfo RegisterDecodeInfo;
 
 /**
  * A register access error message
@@ -54,6 +55,11 @@ typedef struct RegisterAccessError {
  * allowing this function to modify the value before return to the client.
  */
 
+#define REG_DECODE_READ (1 << 0)
+#define REG_DECODE_WRITE (1 << 1)
+#define REG_DECODE_EXECUTE (1 << 2)
+#define REG_DECODE_RW (REG_DECODE_READ | REG_DECODE_WRITE)
+
 struct RegisterAccessInfo {
     const char *name;
     uint64_t ro;
@@ -71,6 +77,14 @@ struct RegisterAccessInfo {
     void (*post_write)(RegisterInfo *reg, uint64_t val);
 
     uint64_t (*post_read)(RegisterInfo *reg, uint64_t val);
+
+    size_t storage;
+    int data_size;
+
+    struct {
+        hwaddr addr;
+        uint8_t flags;
+    } decode;
 };
 
 /**
@@ -108,6 +122,13 @@ struct RegisterInfo {
     MemoryRegion mem;
 };
 
+
+struct RegisterDecodeInfo {
+    RegisterInfo *reg;
+    hwaddr addr;
+    unsigned len;
+};
+
 /**
  * write a value to a register, subject to its restrictions
  * @reg: register to write to
-- 
1.9.1.1.gbb9f595