soc/intel/{skl,cnl}: Move smm_lock() to cpu.c

Looks like smmrelocate.c is nearly identical across multiple platforms.
This is done to be able to deduplicate smmrelocate.c in the follow-ups.

Change-Id: I2edc64c9eabc3815b12a2e3cffb03cba2228eea0
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50933
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/src/soc/intel/skylake/cpu.c b/src/soc/intel/skylake/cpu.c
index 4cadb7f9ee..19f2e3a0bf 100644
--- a/src/soc/intel/skylake/cpu.c
+++ b/src/soc/intel/skylake/cpu.c
@@ -138,6 +138,18 @@ static void per_cpu_smm_trigger(void)
 	smm_relocate();
 }
 
+void smm_lock(void)
+{
+	struct device *sa_dev = pcidev_path_on_root(SA_DEVFN_ROOT);
+	/*
+	 * LOCK the SMM memory window and enable normal SMM.
+	 * After running this function, only a full reset can
+	 * make the SMM registers writable again.
+	 */
+	printk(BIOS_DEBUG, "Locking SMM.\n");
+	pci_write_config8(sa_dev, SMRAM, D_LCK | G_SMRAME | C_BASE_SEG);
+}
+
 static void vmx_configure(void *unused)
 {
 	set_feature_ctrl_vmx();