cpu/x86/smm/smihandler.c: Simplify smm revision handling

The ASEG smihandler bails out if an unsupported SMM save state
revision is detected. Now we have code to find the SMM save state
depending on the SMM save state revision so reuse this to do the same.

This also increases the loglevel when bailing out of SMM due to
unsupported SMM save state revision from BIOS_DEBUG to BIOS_WARNING,
given that the system likely still boots but won't have a functioning
smihandler.

Change-Id: I57198f0c85c0f7a1fa363d3bd236c3d41b68d2f0
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45471
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

1 files changed, 4 insertions, 50 deletions

diff --git a/src/cpu/x86/smm/smihandler.c b/src/cpu/x86/smm/smihandler.c
index 077fa8db8f..0d9131e429 100644
--- a/src/cpu/x86/smm/smihandler.c
+++ b/src/cpu/x86/smm/smihandler.c
@@ -14,23 +14,6 @@
 #include <spi-generic.h>
 #endif
 
-typedef enum {
-	AMD64,
-	EM64T100,
-	EM64T101,
-	LEGACY
-} save_state_type_t;
-
-typedef struct {
-	save_state_type_t type;
-	union {
-	amd64_smm_state_save_area_t *amd64_state_save;
-	em64t100_smm_state_save_area_t *em64t100_state_save;
-	em64t101_smm_state_save_area_t *em64t101_state_save;
-	legacy_smm_state_save_area_t *legacy_state_save;
-	};
-} smm_state_save_area_t;
-
 static int do_driver_init = 1;
 
 typedef enum { SMI_LOCKED, SMI_UNLOCKED } smi_semaphore;
@@ -162,9 +145,6 @@ bool smm_region_overlaps_handler(const struct region *r)
 void smi_handler(void)
 {
 	unsigned int node;
-	const uint32_t smm_rev = smm_revision();
-	smm_state_save_area_t state_save;
-	u32 smm_base = SMM_BASE; /* ASEG */
 
 	/* Are we ok to execute the handler? */
 	if (!smi_obtain_lock()) {
@@ -190,36 +170,10 @@ void smi_handler(void)
 
 	printk(BIOS_SPEW, "\nSMI# #%d\n", node);
 
-	switch (smm_rev) {
-	case 0x00030002:
-	case 0x00030007:
-		state_save.type = LEGACY;
-		state_save.legacy_state_save =
-			smm_save_state(smm_base,
-				       SMM_LEGACY_ARCH_OFFSET, node);
-		break;
-	case 0x00030100:
-		state_save.type = EM64T100;
-		state_save.em64t100_state_save =
-			smm_save_state(smm_base,
-				       SMM_EM64T100_ARCH_OFFSET, node);
-		break;
-	case 0x00030101: /* SandyBridge, IvyBridge, and Haswell */
-		state_save.type = EM64T101;
-		state_save.em64t101_state_save =
-			smm_save_state(smm_base,
-				       SMM_EM64T101_ARCH_OFFSET, node);
-		break;
-	case 0x00020064:
-	case 0x00030064:
-		state_save.type = AMD64;
-		state_save.amd64_state_save =
-			smm_save_state(smm_base,
-				       SMM_AMD64_ARCH_OFFSET, node);
-		break;
-	default:
-		printk(BIOS_DEBUG, "smm_revision: 0x%08x\n", smm_rev);
-		printk(BIOS_DEBUG, "SMI# not supported on your CPU\n");
+	/* Use smm_get_save_state() to see if the smm revision is supported */
+	if (smm_get_save_state(node) == NULL) {
+		printk(BIOS_WARNING, "smm_revision: 0x%08x\n", smm_revision());
+		printk(BIOS_WARNING, "SMI# not supported on your CPU\n");
 		/* Don't release lock, so no further SMI will happen,
 		 * if we don't handle it anyways.
 		 */