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-rw-r--r--src/include/region.h17
-rw-r--r--src/lib/region.c38
2 files changed, 55 insertions, 0 deletions
diff --git a/src/include/region.h b/src/include/region.h
index ed0ad57a28..99ea488cca 100644
--- a/src/include/region.h
+++ b/src/include/region.h
@@ -22,6 +22,7 @@
#include <stdint.h>
#include <stddef.h>
+#include <mem_pool.h>
/*
* Region support.
@@ -116,4 +117,20 @@ extern const struct region_device_ops mem_rdev_ops;
.rdev = REGION_DEV_INIT(&mem_rdev_ops, 0, (size_)), \
}
+struct mmap_helper_region_device {
+ struct mem_pool pool;
+ struct region_device rdev;
+};
+
+#define MMAP_HELPER_REGION_INIT(ops_, offset_, size_) \
+ { \
+ .rdev = REGION_DEV_INIT((ops_), (offset_), (size_)), \
+ }
+
+void mmap_helper_device_init(struct mmap_helper_region_device *mdev,
+ void *cache, size_t cache_size);
+
+void *mmap_helper_rdev_mmap(const struct region_device *, size_t, size_t);
+int mmap_helper_rdev_munmap(const struct region_device *, void *);
+
#endif /* _REGION_H_ */
diff --git a/src/lib/region.c b/src/lib/region.c
index ca8cd7bcf7..b56b3d7e90 100644
--- a/src/lib/region.c
+++ b/src/lib/region.c
@@ -161,3 +161,41 @@ const struct region_device_ops mem_rdev_ops = {
.munmap = mdev_munmap,
.readat = mdev_readat,
};
+
+void mmap_helper_device_init(struct mmap_helper_region_device *mdev,
+ void *cache, size_t cache_size)
+{
+ mem_pool_init(&mdev->pool, cache, cache_size);
+}
+
+void *mmap_helper_rdev_mmap(const struct region_device *rd, size_t offset,
+ size_t size)
+{
+ struct mmap_helper_region_device *mdev;
+ void *mapping;
+
+ mdev = container_of((void *)rd, typeof(*mdev), rdev);
+
+ mapping = mem_pool_alloc(&mdev->pool, size);
+
+ if (mapping == NULL)
+ return NULL;
+
+ if (rd->ops->readat(rd, mapping, offset, size) != size) {
+ mem_pool_free(&mdev->pool, mapping);
+ return NULL;
+ }
+
+ return mapping;
+}
+
+int mmap_helper_rdev_munmap(const struct region_device *rd, void *mapping)
+{
+ struct mmap_helper_region_device *mdev;
+
+ mdev = container_of((void *)rd, typeof(*mdev), rdev);
+
+ mem_pool_free(&mdev->pool, mapping);
+
+ return 0;
+}