fmap: Introduce new function to derive fmap name from offset/size

vboot passes around the offset and size of the region to use in later stages.
To assign more meaning to this pair, provide a function that returns the
fmap area name if there's a precise match (and an error otherwise).

Change-Id: I5724b860271025c8cb8b390ecbd33352ea779660
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/10865
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
This commit is contained in:
Patrick Georgi 2015-07-09 11:27:44 +02:00 committed by Patrick Georgi
parent ad0dda767b
commit 995269062e
2 changed files with 48 additions and 0 deletions

View File

@ -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

View File

@ -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;
}