diff options
| author | Julius Werner <jwerner@chromium.org> | 2016-08-05 10:37:52 -0700 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-08-08 17:35:31 +0200 |
| commit | 41ddd4fcc1d2f7f2eccfa2a5795da5d49e09f18d (patch) | |
| tree | e21b119d48d3fe822e7f665e42fe939a2bd1995d | |
| parent | 98c65c1b0167d47e0eb0c362d8edc40a9fab085b (diff) | |
libpayload: arm64: Fix MMU range overlap check
The ARM64 MMU code maintains a list of used ranges, to avoid mapping the
DMA buffer over the coreboot tables and things like that. Unfortunately,
the overlap with ranges in that list is checked with
(start1 >= start2 && start1 <= end2) || (end1 >= start2 && end1 <= end2)
which is not a full overlap check and misses the case where the second
region is completely contained within the first. This patch replaces
that code with a properly vetted primitive from Stack Overflow.
BRANCH=none
BUG=chrome-os-partner:54416
TEST=Observe how Kevin recovery screen now gets drawn at 10x the speed.
Change-Id: I7e2706426762794e160d743bbfc40da1e26eee12
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/16075
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
| -rw-r--r-- | payloads/libpayload/arch/arm64/mmu.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c index 50e7f6cd17..d84f969dc6 100644 --- a/payloads/libpayload/arch/arm64/mmu.c +++ b/payloads/libpayload/arch/arm64/mmu.c @@ -441,8 +441,7 @@ static int mmu_is_range_free(uint64_t r_base, uint64_t start = r[i].base; uint64_t end = start + r[i].size; - if (((r_base >= start) && (r_base <= end)) || - ((r_end >= start) && (r_end <= end))) + if ((start < r_end) && (end > r_base)) return 0; } |