Alexander Couzens (lynxis@fe80.eu) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8294
-gerrit
commit 9b283e394aac93e237324d703dde1b9150b51691 Author: Alexander Couzens lynxis@fe80.eu Date: Wed Jan 28 01:51:04 2015 +0100
cpu/intel: >= nehalem: add comments to msr finalize's
Improve documentation of lock down MSRs in finalize(). Most of these aren't documented in public MSRs.
Change-Id: I4fc47bb9b71bdd7907aae65fc18b419a17ae8547 Signed-off-by: Alexander Couzens lynxis@fe80.eu --- src/cpu/intel/fsp_model_206ax/finalize.c | 9 +++++++++ src/cpu/intel/haswell/finalize.c | 9 +++++++++ src/cpu/intel/model_2065x/finalize.c | 10 +++++++++- src/cpu/intel/model_206ax/finalize.c | 9 +++++++++ 4 files changed, 36 insertions(+), 1 deletion(-)
diff --git a/src/cpu/intel/fsp_model_206ax/finalize.c b/src/cpu/intel/fsp_model_206ax/finalize.c index 4ed5d1e..534b157 100644 --- a/src/cpu/intel/fsp_model_206ax/finalize.c +++ b/src/cpu/intel/fsp_model_206ax/finalize.c @@ -24,6 +24,11 @@ #include <cpu/x86/msr.h> #include "model_206ax.h"
+/* MSR Documentation based on + * "Sandy Bridge Processor Family BIOS Writer's Guide (BWG)" + * Document Number 504790 + * Revision 1.6.0, June 2012 */ + static void msr_set_bit(unsigned reg, unsigned bit) { msr_t msr = rdmsr(reg); @@ -43,6 +48,7 @@ static void msr_set_bit(unsigned reg, unsigned bit)
void intel_model_206ax_finalize_smm(void) { + /* Lock C-State MSR */ msr_set_bit(MSR_PMG_CST_CONFIG_CONTROL, 15);
/* Lock AES-NI only if supported */ @@ -67,6 +73,9 @@ void intel_model_206ax_finalize_smm(void) msr_set_bit(MSR_PP1_POWER_LIMIT, 31); #endif
+ /* Lock TM interupts - route thermal events to all processors */ msr_set_bit(MSR_MISC_PWR_MGMT, 22); + + /* Lock memory configuration to protect SMM */ msr_set_bit(MSR_LT_LOCK_MEMORY, 0); } diff --git a/src/cpu/intel/haswell/finalize.c b/src/cpu/intel/haswell/finalize.c index 1731322..b87e8c2 100644 --- a/src/cpu/intel/haswell/finalize.c +++ b/src/cpu/intel/haswell/finalize.c @@ -24,6 +24,11 @@ #include <cpu/x86/msr.h> #include "haswell.h"
+/* MSR Documentation based on + * "Sandy Bridge Processor Family BIOS Writer's Guide (BWG)" + * Document Number 504790 + * Revision 1.6.0, June 2012 */ + #if 0 static void msr_set_bit(unsigned reg, unsigned bit) { @@ -46,6 +51,7 @@ static void msr_set_bit(unsigned reg, unsigned bit) void intel_cpu_haswell_finalize_smm(void) { #if 0 + /* Lock C-State MSR */ msr_set_bit(MSR_PMG_CST_CONFIG_CONTROL, 15);
/* Lock AES-NI only if supported */ @@ -70,7 +76,10 @@ void intel_cpu_haswell_finalize_smm(void) msr_set_bit(MSR_PP1_POWER_LIMIT, 31); #endif
+ /* Lock TM interupts - route thermal events to all processors */ msr_set_bit(MSR_MISC_PWR_MGMT, 22); + + /* Lock memory configuration to protect SMM */ msr_set_bit(MSR_LT_LOCK_MEMORY, 0); #endif } diff --git a/src/cpu/intel/model_2065x/finalize.c b/src/cpu/intel/model_2065x/finalize.c index b37a84c..1835dce 100644 --- a/src/cpu/intel/model_2065x/finalize.c +++ b/src/cpu/intel/model_2065x/finalize.c @@ -25,6 +25,11 @@ #include <cpu/intel/speedstep.h> #include "model_2065x.h"
+/* MSR Documentation based on + * "Sandy Bridge Processor Family BIOS Writer's Guide (BWG)" + * Document Number 504790 + * Revision 1.6.0, June 2012 */ + static void msr_set_bit(unsigned reg, unsigned bit) { msr_t msr = rdmsr(reg); @@ -44,6 +49,7 @@ static void msr_set_bit(unsigned reg, unsigned bit)
void intel_model_2065x_finalize_smm(void) { + /* Lock C-State MSR */ msr_set_bit(MSR_PMG_CST_CONFIG_CONTROL, 15);
/* Lock AES-NI only if supported */ @@ -67,7 +73,9 @@ void intel_model_2065x_finalize_smm(void) msr_set_bit(MSR_PP0_POWER_LIMIT, 31); msr_set_bit(MSR_PP1_POWER_LIMIT, 31); #endif - + /* Lock TM interupts - route thermal events to all processors */ msr_set_bit(MSR_MISC_PWR_MGMT, 22); + + /* Lock memory configuration to protect SMM */ msr_set_bit(MSR_LT_LOCK_MEMORY, 0); } diff --git a/src/cpu/intel/model_206ax/finalize.c b/src/cpu/intel/model_206ax/finalize.c index 2c215a4..0c1fe75 100644 --- a/src/cpu/intel/model_206ax/finalize.c +++ b/src/cpu/intel/model_206ax/finalize.c @@ -25,6 +25,11 @@ #include <cpu/intel/speedstep.h> #include "model_206ax.h"
+/* MSR Documentation based on + * "Sandy Bridge Processor Family BIOS Writer's Guide (BWG)" + * Document Number 504790 + * Revision 1.6.0, June 2012 */ + static void msr_set_bit(unsigned reg, unsigned bit) { msr_t msr = rdmsr(reg); @@ -44,6 +49,7 @@ static void msr_set_bit(unsigned reg, unsigned bit)
void intel_model_206ax_finalize_smm(void) { + /* Lock C-State MSR */ msr_set_bit(MSR_PMG_CST_CONFIG_CONTROL, 15);
/* Lock AES-NI only if supported */ @@ -68,6 +74,9 @@ void intel_model_206ax_finalize_smm(void) msr_set_bit(MSR_PP1_POWER_LIMIT, 31); #endif
+ /* Lock TM interupts - route thermal events to all processors */ msr_set_bit(MSR_MISC_PWR_MGMT, 22); + + /* Lock memory configuration to protect SMM */ msr_set_bit(MSR_LT_LOCK_MEMORY, 0); }