[coreboot-gerrit] Patch set updated for coreboot: 0119d49 regions: add memory region device support
Aaron Durbin (adurbin@google.com)
gerrit at coreboot.org
Tue Mar 31 03:28:03 CEST 2015
Aaron Durbin (adurbin at google.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/9131
-gerrit
commit 0119d494b5bbedfbcad8b74a8b6b7c215c035b39
Author: Aaron Durbin <adurbin at chromium.org>
Date: Fri Mar 27 01:03:45 2015 -0500
regions: add memory region device support
In order to make it easy and convenient for memory regions
to be used provide an implementation that can be reused.
Change-Id: I266cd07bbfa16a427c2b31c512e7c87b77f47718
Signed-off-by: Aaron Durbin <adurbin at chromium.org>
---
src/include/region.h | 16 ++++++++++++++++
src/lib/region.c | 42 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/src/include/region.h b/src/include/region.h
index 4f8cda1..45fd074 100644
--- a/src/include/region.h
+++ b/src/include/region.h
@@ -97,4 +97,20 @@ static inline size_t region_sz(const struct region *r)
return r->size;
}
+struct mem_region_device {
+ char *base;
+ struct region_device rdev;
+};
+
+void mem_region_device_init(struct mem_region_device *mdev, void *base,
+ size_t size);
+
+extern const struct region_device_ops mem_rdev_ops;
+
+#define MEM_REGION_DEV_INIT(base_, size_) \
+ { \
+ .base = (base_), \
+ .rdev = REGION_DEV_INIT(&mem_rdev_ops, 0, (size_)), \
+ }
+
#endif /* _REGION_H_ */
diff --git a/src/lib/region.c b/src/lib/region.c
index cf74784..848139d 100644
--- a/src/lib/region.c
+++ b/src/lib/region.c
@@ -119,3 +119,45 @@ int rdev_chain(struct region_device *child, const struct region_device *parent,
return 0;
}
+
+void mem_region_device_init(struct mem_region_device *mdev, void *base,
+ size_t size)
+{
+ memset(mdev, 0, sizeof(*mdev));
+ mdev->base = base;
+ mdev->rdev.ops = &mem_rdev_ops;
+ mdev->rdev.region.size = size;
+}
+
+static void *mdev_mmap(const struct region_device *rd, size_t offset,
+ size_t size)
+{
+ const struct mem_region_device *mdev;
+
+ mdev = container_of(rd, typeof(*mdev), rdev);
+
+ return &mdev->base[offset];
+}
+
+static int mdev_munmap(const struct region_device *rd, void *mapping)
+{
+ return 0;
+}
+
+static ssize_t mdev_readat(const struct region_device *rd, void *b,
+ size_t offset, size_t size)
+{
+ const struct mem_region_device *mdev;
+
+ mdev = container_of(rd, typeof(*mdev), rdev);
+
+ memcpy(b, &mdev->base[offset], size);
+
+ return size;
+}
+
+const struct region_device_ops mem_rdev_ops = {
+ .mmap = mdev_mmap,
+ .munmap = mdev_munmap,
+ .readat = mdev_readat,
+};
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