report successful startup to the platform

For proper CCD password management it is necessary to be able to alert
the rest of the system when the actual restart happens. A good
indication of a restart is successful processing of the Starup command
of the SU_RESET type.

CQ-DEPEND=CL:804141
BRANCH=cr50
BUG=b:67007578
TEST=verified that the callback is indeed called on appropriate starups.

Change-Id: I984fb971410ff29454250c40e44a7ca7710eaf1c
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/803741
Reviewed-by: Andrey Pronin <apronin@chromium.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/Platform.h b/Platform.h
index f7bcbcd..4779594 100644
--- a/Platform.h
+++ b/Platform.h
@@ -384,6 +384,12 @@ _plat__GetFwVersion(
       uint32_t          *fw2
 );
 
+// A function to call after every successful SU_RESET TPM2_Startup.
+LIB_EXPORT void
+_plat__ResetCallback(
+    void
+);
+
 int uart_printf(const char *format, ...);
 #define ecprintf(format, args...) uart_printf(format, ## args);
 
diff --git a/Startup.c b/Startup.c
index 8759e52..54df25b 100644
--- a/Startup.c
+++ b/Startup.c
@@ -163,5 +163,8 @@ TPM2_Startup(
    // The H-CRTM state no longer matters
    g_DrtmPreStartup = FALSE;
 
+   if (startup == SU_RESET)
+       _plat__ResetCallback();
+
    return TPM_RC_SUCCESS;
 }