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authorAaron Durbin <adurbin@chromium.org>2013-06-03 09:46:56 -0500
committerAaron Durbin <adurbin@google.com>2013-06-03 17:30:09 +0200
commit27435d3bcdd4c7bccb326f77ca64a54d3fb1170a (patch)
tree0929d397215a882170f93a549789df2c40275ba2 /src/northbridge/intel
parent373a20c335bdd747d7a2553f0e72e2b3a46f86e8 (diff)
downloadcoreboot-27435d3bcdd4c7bccb326f77ca64a54d3fb1170a.tar.xz
haswell: fix overflow handling TOUUD
It's possible that the TOUUD can be set to less than 4GiB. When that is the case the size_k variable is an extremely large value. Instead ensure TOUUD is greater than 4GiB before adding said resources. Change-Id: I456633d6210824e60665281538300fd15656b86d Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/3352 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/northbridge/intel')
-rw-r--r--src/northbridge/intel/haswell/northbridge.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/northbridge/intel/haswell/northbridge.c b/src/northbridge/intel/haswell/northbridge.c
index 5c1ab3e1ff..45d967e788 100644
--- a/src/northbridge/intel/haswell/northbridge.c
+++ b/src/northbridge/intel/haswell/northbridge.c
@@ -312,6 +312,7 @@ static void mc_report_map_entries(device_t dev, uint64_t *values)
static void mc_add_dram_resources(device_t dev)
{
unsigned long base_k, size_k;
+ unsigned long touud_k;
unsigned long index;
struct resource *resource;
uint64_t mc_values[NUM_MAP_ENTRIES];
@@ -396,8 +397,9 @@ static void mc_add_dram_resources(device_t dev)
/* 4GiB -> TOUUD */
base_k = 4096 * 1024; /* 4GiB */
- size_k = (unsigned long)(mc_values[TOUUD_REG] >> 10) - base_k;
- if (size_k > 0)
+ touud_k = mc_values[TOUUD_REG] >> 10;
+ size_k = touud_k - base_k;
+ if (touud_k > base_k)
ram_resource(dev, index++, base_k, size_k);
/* Reserve everything between A segment and 1MB: