commit 56ab8e2aae25efc839daeb56d5922e66d2680aec
author Subrata Banik <subratabanik@google.com> Fri Jan 07 13:40:19 2022 +0000
committer Subrata Banik <subratabanik@google.com> Wed Jan 19 09:57:47 2022 +0000
tree 2790032028d9ddba711fe08a3eaab3105d571acd
parent 6ac5dc2ca6a6b09d1b0156c2db6aa1385ccaf13e

soc/intel/common/cpu: Use SoC overrides to get CPU privilege level

This patch implements a SoC overrides to check CPU privilege level
as the MSR is not consistent across platforms.

For example: On APL/GLK/DNV, it's MSR 0x120 and CNL onwards it's MSR
0x151.

BUG=b:211573253, b:211950520

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I515f0a3548bc5d6250e30f963d46f28f3c1b90b3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60900
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/alderlake/cpu.c

diff --git a/src/soc/intel/alderlake/cpu.c b/src/soc/intel/alderlake/cpu.c
index 95f8a50..92ffe87 100644
--- a/src/soc/intel/alderlake/cpu.c
+++ b/src/soc/intel/alderlake/cpu.c
@@ -25,6 +25,14 @@
 #include <soc/soc_chip.h>
 #include <types.h>
 
+bool cpu_soc_is_in_untrusted_mode(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_BIOS_DONE);
+	return !!(msr.lo & ENABLE_IA_UNTRUSTED);
+}
+
 static void soc_fsp_load(void)
 {
 	fsps_load();