Stefan Reinauer (stefan.reinauer@coreboot.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/4139
-gerrit
commit 6a7dfb2ec77be337a29f08e3f2179d8010fd2125 Author: Stefan Reinauer reinauer@chromium.org Date: Fri Apr 19 14:22:29 2013 -0700
cbmem utility: compatibility with older coreboot versions
Commit b8ad224 changed the memory address in lb_cbmem_ref coreboot table entries from a pointer to a uint64_t. This change was introduced to make the cbmem utility work on both 32bit and 64bit userland. Unfortunately, this broke the cbmem utility running on older versions of coreboot because they were still providing a 32bit only field for the address while the cbmem utility would now take the following 4 bytes as upper 32bits of a pointer that can obviously not be mmapped. This change checks if the size of the lb_cbmem_ref structure provided by coreboot is smaller than expected, and if so, ignore the upper 32bit of the address read.
Signed-off-by: Stefan Reinauer reinauer@google.com
Change-Id: If4c8e9b72b2a38c961c11d7071b728e61e5f1d18 Commit-Queue: Stefan Reinauer reinauer@google.com Tested-by: Stefan Reinauer reinauer@google.com Reviewed-by: Aaron Durbin adurbin@chromium.org --- util/cbmem/cbmem.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/util/cbmem/cbmem.c b/util/cbmem/cbmem.c index 74e0fd4..e05a72a 100644 --- a/util/cbmem/cbmem.c +++ b/util/cbmem/cbmem.c @@ -22,6 +22,7 @@ #include <stdlib.h> #include <string.h> #include <unistd.h> +#include <inttypes.h> #include <getopt.h> #include <errno.h> #include <fcntl.h> @@ -128,6 +129,25 @@ static struct lb_cbmem_ref timestamps; static struct lb_cbmem_ref console; static struct lb_memory_range cbmem;
+/* This is a work-around for a nasty problem introduced by initially having + * pointer sized entries in the lb_cbmem_ref structures. This caused problems + * on 64bit x86 systems because coreboot is 32bit on those systems. + * When the problem was found, it was corrected, but there are a lot of + * systems out there with a firmware that does not produce the right + * lb_cbmem_ref structure. Hence we try to autocorrect this issue here. + */ +static struct lb_cbmem_ref parse_cbmem_ref(struct lb_cbmem_ref *cbmem_ref) +{ + struct lb_cbmem_ref ret; + + ret = *cbmem_ref; + + if (cbmem_ref->size < sizeof(*cbmem_ref)) + ret.cbmem_addr = (uint32_t)ret.cbmem_addr; + + return ret; +} + static int parse_cbtable(u64 address) { int i, found = 0; @@ -184,12 +204,12 @@ static int parse_cbtable(u64 address) } case LB_TAG_TIMESTAMPS: { debug(" Found timestamp table.\n"); - timestamps = *(struct lb_cbmem_ref *) lbr_p; + timestamps = parse_cbmem_ref((struct lb_cbmem_ref *) lbr_p); continue; } case LB_TAG_CBMEM_CONSOLE: { debug(" Found cbmem console.\n"); - console = *(struct lb_cbmem_ref *) lbr_p; + console = parse_cbmem_ref((struct lb_cbmem_ref *) lbr_p); continue; } case LB_TAG_FORWARD: {