soc/apollolake: SOC specific SMM code

Add SMI handlers that map to SOC specific SMI events
Update relocation_handler in mp_ops

Change-Id: Idefddaf41cf28240f5f8172b00462a7f893889e7
Signed-off-by: Hannah Williams <hannah.williams@intel.com>
Reviewed-on: https://review.coreboot.org/14808
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/soc/intel/apollolake/memmap.c

@@ -20,13 +20,27 @@
 #include <device/pci.h>
 #include <soc/northbridge.h>
 #include <soc/pci_devs.h>
+#include <soc/smm.h>
 
 static uintptr_t smm_region_start(void)
 {
 	return ALIGN_DOWN(pci_read_config32(NB_DEV_ROOT, TSEG), 1*MiB);
 }
 
+static size_t smm_region_size(void)
+{
+	uintptr_t smm_end =
+		ALIGN_DOWN(pci_read_config32(NB_DEV_ROOT, BGSM), 1*MiB);
+	return smm_end - smm_region_start();
+}
+
 void *cbmem_top(void)
 {
 	return (void *)smm_region_start();
 }
+
+void smm_region(void **start, size_t *size)
+{
+	*start = (void *)smm_region_start();
+	*size = smm_region_size();
+}