nb/intel/gm45: Use common code for SMM in TSEG

This makes i82801ix use the common smm southbridge code to set up smm
relocation and smi handler setup. This is needed in this change for the
the smm relocation code relies on some southbridge functions provided
in the common code. Some of the old code is kept for the Q35 qemu
target.

This also caches the TSEG region and therefore increases MTRR usage a
little in some cases.

Currently SMRR msr's are not set on model_1067x and model_6fx since this needs
the MSRR enable bit and lock set in IA32_FEATURE_CONTROL. This will be handled
properly in the subsequent parallel mp init patchset.

Tested on Thinkpad X200: boots and going to and resuming from S3 still
works fine.

Change-Id: Ic80c65ea42fcf554ea5695772e8828d2f3b00b98
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/23419
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/intel/model_1067x/Makefile.inc

@@ -1,5 +1,6 @@
 ramstage-y += model_1067x_init.c
 subdirs-y += ../../x86/name
 subdirs-y += ../common
+subdirs-$(CONFIG_SMM_TSEG) += ../smm/gen1
 
 cpu_microcode_bins += 3rdparty/blobs/cpu/intel/model_1067x/microcode.bin

src/cpu/intel/model_6fx/Makefile.inc

@@ -1,5 +1,6 @@
 ramstage-y += model_6fx_init.c
 subdirs-y += ../../x86/name
 subdirs-y += ../common
+subdirs-$(CONFIG_SMM_TSEG) += ../smm/gen1
 
 cpu_microcode_bins += 3rdparty/blobs/cpu/intel/model_6fx/microcode.bin

src/cpu/intel/smm/gen1/smi.h

@@ -16,5 +16,6 @@ void southbridge_smm_init(void);
 void southbridge_trigger_smi(void);
 void southbridge_clear_smi_status(void);
 u32 northbridge_get_tseg_base(void);
+u32 northbridge_get_tseg_size(void);
 int cpu_get_apic_id_map(int *apic_id_map);
 void northbridge_write_smram(u8 smram);

src/cpu/intel/smm/gen1/smmrelocate.c

@@ -147,7 +147,7 @@ static void fill_in_relocation_params(struct smm_relocation_params *params)
 	/* TSEG base is usually aligned down (to 8MiB). So we can't
 	   derive the TSEG size from the distance to GTT but use the
 	   configuration value instead. */
-	const u32 tseg_size = CONFIG_SMM_TSEG_SIZE;
+	const u32 tseg_size = northbridge_get_tseg_size();
 
 	/* The SMRAM available to the handler is 4MiB
 	   since the IEDRAM lives at TSEGMB + 4MiB. */