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authorDuncan Laurie <dlaurie@chromium.org>2012-06-23 16:37:45 -0700
committerRonald G. Minnich <rminnich@gmail.com>2012-07-25 00:47:10 +0200
commitf4d362339f4d96657be1dc5956c34278d1089eba (patch)
tree4f07a246238d953f054e8aa3937a65c259529081 /src/include
parent472ec9cd7ecb3d283bc05941c7dbb54a10813614 (diff)
ELOG: Add support for a monotonic boot counter in CMOS
This maintains a 32bit monotonically increasing boot counter that is stored in CMOS and logged on every non-S3 boot when the event log is initialized. In CMOS the count is prefixed with a 16bit signature and appended with a 16bit checksum. This counter is incremented in sandybridge early_init which is called by romstage. It is incremented early in order notice when reboots happen after memory init. The counter is then logged when ELOG is initialized and will store the boot count as part of a 'System boot; event. Reboot a few times and look for 'System boot' events in the event log and check that they are increasing. Also verify that the counter does NOT increase when resuming from S3. 171 | 2012-06-23 16:02:55 | System boot | 285 176 | 2012-06-23 16:26:00 | System boot | 286 182 | 2012-06-23 16:27:04 | System boot | 287 189 | 2012-06-23 16:31:10 | System boot | 288 Change-Id: I23faeafcf155edfd10aa6882598b3883575f8a33 Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: http://review.coreboot.org/1315 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/include')
-rw-r--r--src/include/elog.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/include/elog.h b/src/include/elog.h
index 897a90bf41..0542f68fe1 100644
--- a/src/include/elog.h
+++ b/src/include/elog.h
@@ -115,6 +115,11 @@ extern void elog_add_event_dword(u8 event_type, u32 data);
extern void elog_add_event_wake(u8 source, u32 instance);
extern int elog_smbios_write_type15(unsigned long *current, int handle);
+#if CONFIG_ELOG_BOOT_COUNT
+u32 boot_count_read(void);
+u32 boot_count_increment(void);
+#endif
+
#endif /* !CONFIG_ELOG */
#endif /* ELOG_H_ */