soc/intel/sgx: convert SGX and PRMRR devicetree options to Kconfig

The devicetree is not made for user-choosable options, thus introduce
Kconfig options for both SGX and the corresponding PRMRR size.

The PRMRR size Kconfig has been implemented as a maximum value. At
runtime the final PRMRR size gets selected by checking the supported
values in MSR_PRMRR_VALID_CONFIG and trying to select the value nearest
to the chosen one.

When "Maximum" is chosen, the highest possibly value from the MSR gets
used. When a too strict limit is set, coreboot will die, printing an
error message.

Tested successfully on X11SSM-F

Change-Id: I5f08e85898304bba6680075ca5d6bce26aef9a4d
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35799
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>

1 files changed, 2 insertions, 5 deletions

diff --git a/src/soc/intel/apollolake/memmap.c b/src/soc/intel/apollolake/memmap.c
index 567ff1ebc6..de6a7d1f19 100644
--- a/src/soc/intel/apollolake/memmap.c
+++ b/src/soc/intel/apollolake/memmap.c
@@ -16,23 +16,20 @@
  */
 
 #include <cbmem.h>
+#include <intelblocks/cpulib.h>
 #include <soc/systemagent.h>
 
 #include "chip.h"
 
 void *cbmem_top_chipset(void)
 {
-	const config_t *config;
 	void *tolum = (void *)sa_get_tseg_base();
 
 	if (!CONFIG(SOC_INTEL_GLK))
 		return tolum;
 
-	config = config_of_soc();
-
 	/* FSP allocates 2x PRMRR Size Memory for alignment */
-	if (config->sgx_enable)
-		tolum -= config->PrmrrSize * 2;
+	tolum -= get_prmrr_size() * 2;
 
 	return tolum;
 }