cpu/x86/smm: Define single smm_subregion()

At the moment we only have two splitting of TSEG,
one with and one without IED. They can all use
same implementation.

Make configuration problems of TSEG region assertion
failures.

Rename file from stage_cache.c to tseg_region.c to
reflect it's purpose.

Change-Id: I9daf0dec8fbaaa1f4e6004ea034869f43412d7d5
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34776
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: David Guckian
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 0 insertions, 47 deletions

diff --git a/src/soc/intel/icelake/memmap.c b/src/soc/intel/icelake/memmap.c
index 13eb947935..e0d7d68fe6 100644
--- a/src/soc/intel/icelake/memmap.c
+++ b/src/soc/intel/icelake/memmap.c
@@ -33,53 +33,6 @@ void smm_region(uintptr_t *start, size_t *size)
 	*size = sa_get_tseg_size();
 }
 
-/*
- *        Subregions within SMM
- *     +-------------------------+ BGSM
- *     |          IED            | IED_REGION_SIZE
- *     +-------------------------+
- *     |  External Stage Cache   | SMM_RESERVED_SIZE
- *     +-------------------------+
- *     |      code and data      |
- *     |         (TSEG)          |
- *     +-------------------------+ TSEG
- */
-int smm_subregion(int sub, uintptr_t *start, size_t *size)
-{
-	uintptr_t sub_base;
-	size_t sub_size;
-	const size_t ied_size = CONFIG_IED_REGION_SIZE;
-	const size_t cache_size = CONFIG_SMM_RESERVED_SIZE;
-
-	smm_region(&sub_base, &sub_size);
-
-	switch (sub) {
-	case SMM_SUBREGION_HANDLER:
-		/* Handler starts at the base of TSEG. */
-		sub_size -= ied_size;
-		sub_size -= cache_size;
-		break;
-	case SMM_SUBREGION_CACHE:
-		/* External cache is in the middle of TSEG. */
-		sub_base += sub_size - (ied_size + cache_size);
-		sub_size = cache_size;
-		break;
-	case SMM_SUBREGION_CHIPSET:
-		/* IED is at the top. */
-		sub_base += sub_size - ied_size;
-		sub_size = ied_size;
-		break;
-	default:
-		*start = 0;
-		*size = 0;
-		return -1;
-	}
-
-	*start = sub_base;
-	*size = sub_size;
-	return 0;
-}
-
 /* Calculate ME Stolen size */
 static size_t get_imr_size(void)
 {