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

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

Change-Id: I5f947cfae730b67bc76a581bc90cb10e5a2a4a52
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/25598
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/northbridge/intel/pineview/Kconfig

@@ -30,6 +30,7 @@ config NORTHBRIDGE_SPECIFIC_OPTIONS # dummy
 	select INTEL_GMA_ACPI
 	select POSTCAR_STAGE
 	select POSTCAR_CONSOLE
+	select SMM_TSEG
 
 config BOOTBLOCK_NORTHBRIDGE_INIT
 	string

src/northbridge/intel/pineview/northbridge.c

@@ -27,6 +27,7 @@
 #include <boot/tables.h>
 #include <arch/acpi.h>
 #include <northbridge/intel/pineview/pineview.h>
+#include <cpu/intel/smm/gen1/smi.h>
 
 /* Reserve everything between A segment and 1MB:
  *
@@ -141,6 +142,36 @@ static void mch_domain_read_resources(struct device *dev)
 	add_fixed_resources(dev, index);
 }
 
+void northbridge_write_smram(u8 smram)
+{
+	struct device *dev = dev_find_slot(0, PCI_DEVFN(0, 0));
+
+	if (dev == NULL)
+		die("could not find pci 00:00.0!\n");
+
+	pci_write_config8(dev, SMRAM, smram);
+}
+
+/*
+ * Really doesn't belong here but will go away with parallel mp init,
+ * so let it be here for a while...
+ */
+int cpu_get_apic_id_map(int *apic_id_map)
+{
+	unsigned int i;
+
+	/* Logical processors (threads) per core */
+	const struct cpuid_result cpuid1 = cpuid(1);
+	/* Read number of cores. */
+	const char cores = (cpuid1.ebx >> 16) & 0xf;
+
+	/* TODO in parallel MP cpuid(1).ebx */
+	for (i = 0; i < cores; i++)
+		apic_id_map[i] = i;
+
+	return cores;
+}
+
 static void mch_domain_set_resources(struct device *dev)
 {
 	struct resource *res;

src/northbridge/intel/pineview/ram_calc.c

@@ -24,6 +24,7 @@
 #include <northbridge/intel/pineview/pineview.h>
 #include <cpu/x86/mtrr.h>
 #include <cpu/intel/romstage.h>
+#include <cpu/intel/smm/gen1/smi.h>
 
 u8 decode_pciebar(u32 *const base, u32 *const len)
 {
@@ -94,15 +95,46 @@ u32 decode_igd_gtt_size(const u32 gsm)
 	return (u32)(gsmsize[gsm] << 10);
 }
 
+/** Decodes used TSEG size to bytes. */
+static u32 decode_tseg_size(const u32 esmramc)
+{
+	if (!(esmramc & 1))
+		return 0;
+
+	switch ((esmramc >> 1) & 3) {
+	case 0:
+		return 1 << 20;
+	case 1:
+		return 2 << 20;
+	case 2:
+		return 8 << 20;
+	case 3:
+	default:
+		die("Bad TSEG setting.\n");
+	}
+}
+
+u32 northbridge_get_tseg_size(void)
+{
+	const u8 esmramc = pci_read_config8(PCI_DEV(0, 0, 0), ESMRAMC);
+	return decode_tseg_size(esmramc);
+}
+
+u32 northbridge_get_tseg_base(void)
+{
+	return pci_read_config32(PCI_DEV(0, 0, 0), TSEG);
+}
+
+
 /* Depending of UMA and TSEG configuration, TSEG might start at any
  * 1 MiB alignment. As this may cause very greedy MTRR setup, push
  * CBMEM top downwards to 4 MiB boundary.
  */
 void *cbmem_top(void)
 {
-	uintptr_t top_of_ram = pci_read_config32(PCI_DEV(0, 0, 0), TSEG);
+	uintptr_t top_of_ram = ALIGN_DOWN(northbridge_get_tseg_base(), 4*MiB);
-	top_of_ram = ALIGN_DOWN(top_of_ram, 4*MiB);
 	return (void *) top_of_ram;
+
 }
 
 #define ROMSTAGE_RAM_STACK_SIZE 0x5000
@@ -124,14 +156,14 @@ void platform_enter_postcar(void)
 	/* Cache RAM as WB from 0 -> CACHE_TMP_RAMTOP. */
 	postcar_frame_add_mtrr(&pcf, 0, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK);
 
-	/* Cache two separate 4 MiB regions below the top of ram, this
+	/* Cache 8 MiB region below the top of ram and 2 MiB above top of
-	 * satisfies MTRR alignment requirements. If you modify this to
+	 * ram to cover both cbmem as the TSEG region.
-	 * cover TSEG, make sure UMA region is not set with WRBACK as it
-	 * causes hard-to-recover boot failures.
 	 */
 	top_of_ram = (uintptr_t)cbmem_top();
-	postcar_frame_add_mtrr(&pcf, top_of_ram - 4*MiB, 4*MiB, MTRR_TYPE_WRBACK);
+	postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 8*MiB,
-	postcar_frame_add_mtrr(&pcf, top_of_ram - 8*MiB, 4*MiB, MTRR_TYPE_WRBACK);
+			MTRR_TYPE_WRBACK);
+	postcar_frame_add_mtrr(&pcf, northbridge_get_tseg_base(),
+			       northbridge_get_tseg_size(), MTRR_TYPE_WRBACK);
 
 	run_postcar_phase(&pcf);