Aaron Durbin (adurbin@chromium.org) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/12782
-gerrit
commit e1e49bc7ba5480338ab6f5980e38063b42cb3e2e Author: Aaron Durbin adurbin@chromium.org Date: Tue Dec 15 13:29:41 2015 -0600
commonlib: Add function to compute relative offsets from two region_devices.
Provide a helper function which returns the relative offset between 2 region_devices that have a parent-child child relationship.
BUG=chrome-os-partner:48412 BUG=chromium:445938 BRANCH=None TEST=Utilized and booted on glados.
Change-Id: Ie0041b33e73a6601748f1289e98b6f1f8756eb11 Signed-off-by: Aaron Durbin adurbin@chromium.org --- src/commonlib/include/commonlib/region.h | 7 +++++++ src/commonlib/region.c | 12 ++++++++++++ 2 files changed, 19 insertions(+)
diff --git a/src/commonlib/include/commonlib/region.h b/src/commonlib/include/commonlib/region.h index cc4ee28..35d48ad 100644 --- a/src/commonlib/include/commonlib/region.h +++ b/src/commonlib/include/commonlib/region.h @@ -121,6 +121,13 @@ static inline void *rdev_mmap_full(const struct region_device *rd) return rdev_mmap(rd, 0, region_device_sz(rd)); }
+/* + * Compute relative offset of the child (c) w.r.t. the parent (p). Returns < 0 + * when child is not within the parent's region. + */ +ssize_t rdev_relative_offset(const struct region_device *p, + const struct region_device *c); + struct mem_region_device { char *base; struct region_device rdev; diff --git a/src/commonlib/region.c b/src/commonlib/region.c index 8b0b0d9..2cd273a 100644 --- a/src/commonlib/region.c +++ b/src/commonlib/region.c @@ -48,6 +48,18 @@ static const struct region_device *rdev_root(const struct region_device *rdev) return rdev->root; }
+ssize_t rdev_relative_offset(const struct region_device *p, + const struct region_device *c) +{ + if (rdev_root(p) != rdev_root(c)) + return -1; + + if (!is_subregion(&p->region, &c->region)) + return -1; + + return region_device_offset(c) - region_device_offset(p); +} + void *rdev_mmap(const struct region_device *rd, size_t offset, size_t size) { const struct region_device *rdev;