From 8c5947709a1d9e72d6ce17c48068b38afcb81967 Mon Sep 17 00:00:00 2001 From: Stefan Reinauer Date: Fri, 19 Apr 2013 14:22:29 -0700 Subject: [PATCH] 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 Change-Id: If4c8e9b72b2a38c961c11d7071b728e61e5f1d18 Commit-Queue: Stefan Reinauer Tested-by: Stefan Reinauer Reviewed-by: Aaron Durbin Reviewed-on: http://review.coreboot.org/4139 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich --- 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 74e0fd4afd..e05a72aed9 100644 --- a/util/cbmem/cbmem.c +++ b/util/cbmem/cbmem.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -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: {