[S] Change in coreboot[master]: soc/amd/smm: Sanity check the SMM TSEG size

[Felix Held (Code Review)]

Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/75405?usp=email )

(

6 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: soc/amd/smm: Sanity check the SMM TSEG size
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soc/amd/smm: Sanity check the SMM TSEG size

As per AMD64 Architecture Programmer's Manual, section 10.2.5 SMRAM
Protected Areas:
The TSEG range must be aligned to a 128 Kbyte boundary and the minimum
TSEG size is 128 Kbytes.

The SMM TSEG size should be less than SMM reserved size.

AMD TSEG mask works like an MTRR. It needs to be aligned to it's size
and it's size needs to be a power of 2.

Change-Id: Ic4f557c7b77db6fc5ab2783ca4e2ebe7a4476e85
Signed-off-by: Zheng Bao 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/75405
Reviewed-by: Paul Menzel 
Reviewed-by: Himanshu Sahdev 
Reviewed-by: Arthur Heymans 
Tested-by: build bot (Jenkins) 
Reviewed-by: Eric Lai 
---
M src/soc/amd/common/block/include/amdblocks/smm.h
1 file changed, 12 insertions(+), 0 deletions(-)

Approvals:
  Eric Lai: Looks good to me, but someone else must approve
  Arthur Heymans: Looks good to me, approved
  Paul Menzel: Looks good to me, but someone else must approve
  Himanshu Sahdev: Looks good to me, but someone else must approve
  build bot (Jenkins): Verified

diff --git a/src/soc/amd/common/block/include/amdblocks/smm.h b/src/soc/amd/common/block/include/amdblocks/smm.h
index fb2e488..97b11be 100644
--- a/src/soc/amd/common/block/include/amdblocks/smm.h
+++ b/src/soc/amd/common/block/include/amdblocks/smm.h
@@ -15,4 +15,16 @@
 /* See SMITYPE_* for list possible of events. GEVENTS are handled with mainboard_smi_gpi. */
 void mainboard_handle_smi(int event);

+#if CONFIG_SMM_TSEG_SIZE != 0
+#if (CONFIG_SMM_TSEG_SIZE <= CONFIG_SMM_RESERVED_SIZE)
+# error "CONFIG_SMM_TSEG_SIZE <= CONFIG_SMM_RESERVED_SIZE"
+#endif
+#if (CONFIG_SMM_TSEG_SIZE < 0x20000)
+# error "CONFIG_SMM_TSEG_SIZE must at least be 128KiB"
+#endif
+#if ((CONFIG_SMM_TSEG_SIZE & (CONFIG_SMM_TSEG_SIZE - 1)) != 0)
+# error "CONFIG_SMM_TSEG_SIZE is not a power of 2"
+#endif
+#endif
+
 #endif