[XS] Change in coreboot[main]: cpu/x86/Kconfig: Add SMM Kconfig help

[Nico Huber (Code Review)]

Nico Huber has submitted this change. ( https://review.coreboot.org/c/coreboot/+/77973?usp=email )

(

2 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: cpu/x86/Kconfig: Add SMM Kconfig help
......................................................................

cpu/x86/Kconfig: Add SMM Kconfig help

Signed-off-by: Maximilian Brune 
Change-Id: Ia0a5c48c6314f53c4ed72958f5d6f839f0a5c2ca
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77973
Reviewed-by: Nico Huber 
Tested-by: build bot (Jenkins) 
---
M src/cpu/x86/Kconfig
1 file changed, 8 insertions(+), 0 deletions(-)

Approvals:
  Nico Huber: Looks good to me, approved
  build bot (Jenkins): Verified

diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 417989d..828c0f9 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -163,11 +163,19 @@
    bool
    default n
    depends on !NO_SMM
+	help
+	  Legacy memory region of SMM (System Management Mode). It has been
+	  replaced by TSEG and is currently only used for QEMU emulation target.

config SMM_TSEG
    bool
    default y
    depends on !(NO_SMM || SMM_ASEG)
+	help
+	  Top of Low Memory Segment (TSEG) is comprised of the SMRAM and IEDRAM.
+	  SMRAM is a memory region used in SMM (System Management Mode) only.
+	  IEDRAM is a memory region used for enhanced debug features.
+	  SMM-mode processor access to TSEG always targets the physical DRAM.

if HAVE_SMI_HANDLER