[coreboot-gerrit] Change in coreboot[master]: soc/intel/common/block/smm: add case intrusion to SMI handler

[Patrick Georgi (Code Review)]

Patrick Georgi has submitted this change. ( https://review.coreboot.org/c/coreboot/+/39265 )

Change subject: soc/intel/common/block/smm: add case intrusion to SMI handler
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soc/intel/common/block/smm: add case intrusion to SMI handler

This adds case intrusion detection to the SMI handler. At this point one
can add the code to be executed when the INTRUDER signal gets asserted
(iow: when the case is opened).

Examples:
 - issue a warning
 - trigger an NMI
 - call poweroff()
 - ...

Tested on X11SSM-F.

Change-Id: Ifad675bb09215ada760efebdcd915958febf5778
Signed-off-by: Michael Niewöhner 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39265
Tested-by: build bot (Jenkins) 
Reviewed-by: Aaron Durbin 
Reviewed-by: Paul Menzel 
---
M src/soc/intel/common/block/smm/smihandler.c
1 file changed, 9 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Paul Menzel: Looks good to me, but someone else must approve
  Aaron Durbin: Looks good to me, approved

diff --git a/src/soc/intel/common/block/smm/smihandler.c b/src/soc/intel/common/block/smm/smihandler.c
index 54f4e41..12c538e 100644
--- a/src/soc/intel/common/block/smm/smihandler.c
+++ b/src/soc/intel/common/block/smm/smihandler.c
@@ -28,6 +28,7 @@
 #include <intelblocks/fast_spi.h>
 #include <intelblocks/pmclib.h>
 #include <intelblocks/smihandler.h>
+#include <intelblocks/tco.h>
 #include <intelblocks/uart.h>
 #include <smmstore.h>
 #include <soc/nvs.h>
@@ -453,6 +454,14 @@
    	/* Handle TCO timeout */
    	printk(BIOS_DEBUG, "TCO Timeout.\n");
    }
+
+	if (tco_sts & (TCO_INTRD_DET << 16)) { /* INTRUDER# assertion */
+		/*
+		 * Handle intrusion event
+		 * If we ever get here, probably the case has been opened.
+		 */
+		printk(BIOS_CRIT, "Case intrusion detected.\n");
+	}
 }

void smihandler_southbridge_periodic(