[Qemu-devel] [PATCH v3 07/16] register: Add block initialise helper

[Alistair Francis <alistair.francis@xilinx.com>]

From: Peter Crosthwaite <peter.crosthwaite@xilinx.com>

Add a helper that will scan a static RegisterAccessInfo Array
and populate a container MemoryRegion with registers as defined.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Alistair Francis <alistair.francis@xilinx.com>
---
V3:
 - Fix typo
V2:
 - Use memory_region_add_subregion_no_print()

 hw/core/register.c    | 29 +++++++++++++++++++++++++++++
 include/hw/register.h | 20 ++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/hw/core/register.c b/hw/core/register.c
index 939f398..4d7dd95 100644
--- a/hw/core/register.c
+++ b/hw/core/register.c
@@ -258,6 +258,35 @@ uint64_t register_read_memory_le(void *opaque, hwaddr addr, unsigned size)
     return register_read_memory(opaque, addr, size, false);
 }
 
+void register_init_block32(DeviceState *owner, const RegisterAccessInfo *rae,
+                           int num, RegisterInfo *ri, uint32_t *data,
+                           MemoryRegion *container, const MemoryRegionOps *ops,
+                           bool debug_enabled)
+{
+    const char *debug_prefix = object_get_typename(OBJECT(owner));
+    int i;
+
+    for (i = 0; i < num; i++) {
+        int index = rae[i].decode.addr / 4;
+        RegisterInfo *r = &ri[index];
+
+        *r = (RegisterInfo) {
+            .data = &data[index],
+            .data_size = sizeof(uint32_t),
+            .access = &rae[i],
+            .debug = debug_enabled,
+            .prefix = debug_prefix,
+            .opaque = owner,
+        };
+        register_init(r);
+
+        memory_region_init_io(&r->mem, OBJECT(owner), ops, r, r->access->name,
+                              sizeof(uint32_t));
+        memory_region_add_subregion_no_print(container,
+                                             r->access->decode.addr, &r->mem);
+    }
+}
+
 static const TypeInfo register_info = {
     .name  = TYPE_REGISTER,
     .parent = TYPE_DEVICE,
diff --git a/include/hw/register.h b/include/hw/register.h
index 3316458..30dedbf 100644
--- a/include/hw/register.h
+++ b/include/hw/register.h
@@ -182,6 +182,26 @@ void register_write_memory_le(void *opaque, hwaddr addr, uint64_t value,
 uint64_t register_read_memory_be(void *opaque, hwaddr addr, unsigned size);
 uint64_t register_read_memory_le(void *opaque, hwaddr addr, unsigned size);
 
+/**
+ * Init a block of consecutive registers into a container MemoryRegion. A
+ * number of constant register definitions are parsed to create a corresponding
+ * array of RegisterInfo's.
+ *
+ * @owner: device owning the registers
+ * @rae: Register definitions to init
+ * @num: number of registers to init (length of @rae)
+ * @ri: Register array to init
+ * @data: Array to use for register data
+ * @container: Memory region to contain new registers
+ * @ops: Memory region ops to access registers.
+ * @debug enabled: turn on/off verbose debug information
+ */
+
+void register_init_block32(DeviceState *owner, const RegisterAccessInfo *rae,
+                           int num, RegisterInfo *ri, uint32_t *data,
+                           MemoryRegion *container, const MemoryRegionOps *ops,
+                           bool debug_enabled);
+
 /* Define constants for a 32 bit register */
 #define REG32(reg, addr)                                                  \
     enum { A_ ## reg = (addr) };                                          \
-- 
2.5.0