diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2015-12-15 13:29:41 -0600 |
|---|---|---|
| committer | Aaron Durbin <adurbin@chromium.org> | 2016-01-06 01:11:15 +0100 |
| commit | 990ab7efe5d0eddb96542042bf5106811365e34a (patch) | |
| tree | 9b251fbeb52a6f70f703a988ff553c80ff55b6dd /src | |
| parent | af91b8b086b6fd087a99a4e88ad76e46defacf9b (diff) | |
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>
Reviewed-on: https://review.coreboot.org/12782
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/commonlib/include/commonlib/region.h | 7 | ||||
| -rw-r--r-- | src/commonlib/region.c | 12 |
2 files changed, 19 insertions, 0 deletions
diff --git a/src/commonlib/include/commonlib/region.h b/src/commonlib/include/commonlib/region.h index cc4ee289d2..35d48ade85 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 8b0b0d9748..2cd273a883 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; |