Add support for Intel Sandybridge CPU

Change-Id: I9f37e291c00c0640c6600d8fdd6dcc13c3e5b8d5
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/855
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/cpu/intel/model_206ax/bootblock.c

@@ -0,0 +1,152 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#include <stdint.h>
+#include <arch/cpu.h>
+#include <cpu/x86/cache.h>
+#include <cpu/x86/msr.h>
+#include <cpu/x86/mtrr.h>
+
+static const uint32_t microcode_updates[] = {
+	#include "x06_microcode.h"
+};
+
+struct microcode {
+	u32 hdrver;	/* Header Version */
+	u32 rev;	/* Patch ID       */
+	u32 date;	/* DATE           */
+	u32 sig;	/* CPUID          */
+
+	u32 cksum;	/* Checksum       */
+	u32 ldrver;	/* Loader Version */
+	u32 pf;		/* Platform ID    */
+
+	u32 data_size;	/* Data size      */
+	u32 total_size;	/* Total size     */
+
+	u32 reserved[3];
+	u32 bits[1012];
+};
+
+static inline u32 read_microcode_rev(void)
+{
+	/* Some Intel Cpus can be very finicky about the
+	 * CPUID sequence used.  So this is implemented in
+	 * assembly so that it works reliably.
+	 */
+	msr_t msr;
+	__asm__ volatile (
+		"wrmsr\n\t"
+		"xorl %%eax, %%eax\n\t"
+		"xorl %%edx, %%edx\n\t"
+		"movl $0x8b, %%ecx\n\t"
+		"wrmsr\n\t"
+		"movl $0x01, %%eax\n\t"
+		"cpuid\n\t"
+		"movl $0x08b, %%ecx\n\t"
+		"rdmsr \n\t"
+		: /* outputs */
+		"=a" (msr.lo), "=d" (msr.hi)
+		: /* inputs */
+		: /* trashed */
+		 "ecx"
+	);
+	return msr.hi;
+}
+
+void intel_update_microcode(const void *microcode_updates)
+{
+	unsigned int eax;
+	unsigned int pf, rev, sig;
+	unsigned int x86_model, x86_family;
+	const struct microcode *m;
+	const char *c;
+	msr_t msr;
+
+	/* cpuid sets msr 0x8B iff a microcode update has been loaded. */
+	msr.lo = 0;
+	msr.hi = 0;
+	wrmsr(0x8B, msr);
+	eax = cpuid_eax(1);
+	msr = rdmsr(0x8B);
+	rev = msr.hi;
+	x86_model = (eax >>4) & 0x0f;
+	x86_family = (eax >>8) & 0x0f;
+	sig = eax;
+
+	pf = 0;
+	if ((x86_model >= 5)||(x86_family>6)) {
+		msr = rdmsr(0x17);
+		pf = 1 << ((msr.hi >> 18) & 7);
+	}
+
+	m = microcode_updates;
+	for(c = microcode_updates; m->hdrver;  m = (const struct microcode *)c) {
+		if ((m->sig == sig) && (m->pf & pf)) {
+			unsigned int new_rev;
+			msr.lo = (unsigned long)(&m->bits) & 0xffffffff;
+			msr.hi = 0;
+			wrmsr(0x79, msr);
+
+			/* Read back the new microcode version */
+			new_rev = read_microcode_rev();
+			break;
+		}
+		if (m->total_size) {
+			c += m->total_size;
+		} else {
+			c += 2048;
+		}
+	}
+}
+
+static void set_var_mtrr(
+	unsigned reg, unsigned base, unsigned size, unsigned type)
+
+{
+	/* Bit Bit 32-35 of MTRRphysMask should be set to 1 */
+	/* FIXME: It only support 4G less range */
+	msr_t basem, maskm;
+	basem.lo = base | type;
+	basem.hi = 0;
+	wrmsr(MTRRphysBase_MSR(reg), basem);
+	maskm.lo = ~(size - 1) | MTRRphysMaskValid;
+	maskm.hi = (1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1;
+	wrmsr(MTRRphysMask_MSR(reg), maskm);
+}
+
+static void enable_rom_caching(void)
+{
+	msr_t msr;
+
+	disable_cache();
+	set_var_mtrr(1, 0xffc00000, 4*1024*1024, MTRR_TYPE_WRPROT);
+	enable_cache();
+
+	/* Enable Variable MTRRs */
+	msr.hi = 0x00000000;
+	msr.lo = 0x00000800;
+	wrmsr(MTRRdefType_MSR, msr);
+}
+
+static void bootblock_cpu_init(void)
+{
+	enable_rom_caching();
+	intel_update_microcode(microcode_updates);
+}