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-rw-r--r--src/include/fmap.h5
-rw-r--r--src/lib/fmap.c43
2 files changed, 48 insertions, 0 deletions
diff --git a/src/include/fmap.h b/src/include/fmap.h
index e575bbf3fc..671e802775 100644
--- a/src/include/fmap.h
+++ b/src/include/fmap.h
@@ -21,6 +21,7 @@
#define _FMAP_H_
#include <region.h>
+#include <fmap_serialized.h>
/* Locate the named area in the fmap and fill in a region device representing
* that area. The region is a sub-region of the readonly boot media. Return
@@ -32,4 +33,8 @@ int fmap_locate_area_as_rdev(const char *name, struct region_device *area);
* < 0 on error. */
int fmap_locate_area(const char *name, struct region *r);
+/* Find fmap area name by offset and size.
+ * Return 0 on success, < 0 on error. */
+int fmap_find_region_name(const struct region * const ar,
+ char name[FMAP_STRLEN]);
#endif
diff --git a/src/lib/fmap.c b/src/lib/fmap.c
index 0f48cdc414..f2087c3f69 100644
--- a/src/lib/fmap.c
+++ b/src/lib/fmap.c
@@ -117,3 +117,46 @@ int fmap_locate_area(const char *name, struct region *ar)
return -1;
}
+
+int fmap_find_region_name(const struct region * const ar,
+ char name[FMAP_STRLEN])
+{
+ struct region_device fmrd;
+ size_t offset;
+
+ if (find_fmap_directory(&fmrd))
+ return -1;
+
+ /* Start reading the areas just after fmap header. */
+ offset = sizeof(struct fmap);
+
+ while (1) {
+ struct fmap_area *area;
+
+ area = rdev_mmap(&fmrd, offset, sizeof(*area));
+
+ if (area == NULL)
+ return -1;
+
+ if ((ar->offset != area->offset) ||
+ (ar->size != area->size)) {
+ rdev_munmap(&fmrd, area);
+ offset += sizeof(struct fmap_area);
+ continue;
+ }
+
+ printk(BIOS_DEBUG, "FMAP: area (%zx, %zx) found, named %s\n",
+ ar->offset, ar->size, area->name);
+
+ memcpy(name, area->name, FMAP_STRLEN);
+
+ rdev_munmap(&fmrd, area);
+
+ return 0;
+ }
+
+ printk(BIOS_DEBUG, "FMAP: area (%zx, %zx) not found\n",
+ ar->offset, ar->size);
+
+ return -1;
+}