diff options
| author | Duncan Laurie <dlaurie@chromium.org> | 2012-06-23 16:37:45 -0700 |
|---|---|---|
| committer | Ronald G. Minnich <rminnich@gmail.com> | 2012-07-25 00:47:10 +0200 |
| commit | f4d362339f4d96657be1dc5956c34278d1089eba (patch) | |
| tree | 4f07a246238d953f054e8aa3937a65c259529081 /src/include | |
| parent | 472ec9cd7ecb3d283bc05941c7dbb54a10813614 (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.h | 5 |
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_ */ |