[coreboot-gerrit] New patch to review for coreboot: 0274652 regions: add mmap helper device

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9132

-gerrit

commit 0274652f05c5acb83f6065569a2153e97f737396
Author: Aaron Durbin 
Date:   Fri Mar 27 01:58:06 2015 -0500

regions: add mmap helper device

In order to facilitate platforms which need a buffer cache
    for performing boot device operations provide infrastructure
    to share the logic in managing the buffer and operations.

Change-Id: I45dd9f213029706ff92a3e5a2c9edd5e8b541e27
    Signed-off-by: Aaron Durbin 
---
 src/include/region.h | 15 +++++++++++++++
 src/lib/region.c     | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/src/include/region.h b/src/include/region.h
index 45fd074..c4e74f2 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.
@@ -113,4 +114,18 @@ 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_, cache_, cache_size_) \
+	{								\
+		.pool = MEM_POOL_INIT((cache_), (cache_size_)),		\
+		.rdev = REGION_DEV_INIT((ops_), (offset_), (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 93dfb92..022c3db 100644
--- a/src/lib/region.c
+++ b/src/lib/region.c
@@ -160,3 +160,35 @@ const struct region_device_ops mem_rdev_ops = {
    .munmap = mdev_munmap,
    .readat = mdev_readat,
 };
+
+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 (rdev->ops->readat(rdev, mapping, offset, size) != size) {
+		mem_pool_free(&mdev->pool, mapping);
+		return NULL;
+	}
+
+	return mapping;
+}
+
+void *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;
+}