haswell: RESET_ON_INVALID_RAMSTAGE_CACHE option

The RESET_ON_INVALID_RAMSTAGE_CACHE option indicates what to do
when the ramstage cache is found to be invalid on a S3 wake. If
selected the system will perform a system reset on S3 wake when the
ramstage cache is invalid. Otherwise it will signal to load the
ramstage from cbfs.

Change-Id: I8f21fcfc7f95fb3377ed2932868aa49a68904803
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2807
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

2 files changed, 25 insertions, 4 deletions

diff --git a/src/cpu/intel/haswell/Kconfig b/src/cpu/intel/haswell/Kconfig
index b49795dd91..d1f521d69f 100644
--- a/src/cpu/intel/haswell/Kconfig
+++ b/src/cpu/intel/haswell/Kconfig
@@ -41,4 +41,16 @@ config MICROCODE_INCLUDE_PATH
 	string
 	default "src/cpu/intel/haswell"
 
+config RESET_ON_INVALID_RAMSTAGE_CACHE
+	bool "Reset the system on S3 wake when ramstage cache invalid."
+	default n
+	depends on RELOCATABLE_RAMSTAGE
+	help
+	  The haswell romstage code caches the loaded ramstage program
+	  in SMM space. On S3 wake the romstage will copy over a fresh
+	  ramstage that was cached in the SMM space. This option determines
+	  the action to take when the ramstage cache is invalid. If selected
+	  the system will reset otherwise the ramstage will be reloaded from
+	  cbfs.
+
 endif
diff --git a/src/cpu/intel/haswell/romstage.c b/src/cpu/intel/haswell/romstage.c
index d491c7e4ad..4ece6c2f9c 100644
--- a/src/cpu/intel/haswell/romstage.c
+++ b/src/cpu/intel/haswell/romstage.c
@@ -36,6 +36,7 @@
 #include <cbmem.h>
 #include <cbfs.h>
 #include <romstage_handoff.h>
+#include <reset.h>
 #if CONFIG_CHROMEOS
 #include <vendorcode/google/chromeos/chromeos.h>
 #endif
@@ -46,6 +47,14 @@
 #include "southbridge/intel/lynxpoint/me.h"
 
 
+static inline void reset_system(void)
+{
+	hard_reset();
+	while (1) {
+		hlt();
+	}
+}
+
 /* The cache-as-ram assembly file calls romstage_main() after setting up
  * cache-as-ram.  romstage_main() will then call the mainboards's
  * mainboard_romstage_entry() function. That function then calls
@@ -271,10 +280,7 @@ void romstage_common(const struct romstage_params *params)
 #if CONFIG_HAVE_ACPI_RESUME
 	if (wake_from_s3 && !cbmem_was_initted) {
 		/* Failed S3 resume, reset to come up cleanly */
-		outb(0x6, 0xcf9);
-		while (1) {
-			hlt();
-		}
+		reset_system();
 	}
 #endif
 
@@ -375,6 +381,9 @@ void *load_cached_ramstage(struct romstage_handoff *handoff)
 
 	if (cache->magic != RAMSTAGE_CACHE_MAGIC) {
 		printk(BIOS_DEBUG, "Invalid ramstage cache found.\n");
+		#if CONFIG_RESET_ON_INVALID_RAMSTAGE_CACHE
+		reset_system();
+		#endif
 		return NULL;
 	}