regions: add memory region device support

Provide common code for using memory-backed region devices.
This allows in-memory buffers to act as a region device.

Change-Id: I266cd07bbfa16a427c2b31c512e7c87b77f47718
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9131
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/src/include/region.h b/src/include/region.h
index cb911023b3..ed0ad57a28 100644
--- a/src/include/region.h
+++ b/src/include/region.h
@@ -97,4 +97,23 @@ static inline size_t region_sz(const struct region *r)
 	return r->size;
 }
 
+struct mem_region_device {
+	char *base;
+	struct region_device rdev;
+};
+
+/* Iniitalize at runtime a mem_region_device. This would be used when
+ * the base and size are dynamic or can't be known during linking. */
+void mem_region_device_init(struct mem_region_device *mdev, void *base,
+				size_t size);
+
+extern const struct region_device_ops mem_rdev_ops;
+
+/* Statically initialize mem_region_device. */
+#define MEM_REGION_DEV_INIT(base_, size_)				\
+	{								\
+		.base = (void *)(base_),				\
+		.rdev = REGION_DEV_INIT(&mem_rdev_ops, 0, (size_)),	\
+	}
+
 #endif /* _REGION_H_ */