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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 The Chromium OS Authors. All rights reserved.
*
* 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.
*/
#include <stdint.h>
#include <stdlib.h>
#include <arch/cpu.h>
#include <cpu/x86/msr.h>
#include "model_206ax.h"
/* MSR Documentation based on
* "Sandy Bridge Processor Family BIOS Writer's Guide (BWG)"
* Document Number 504790
* Revision 1.6.0, June 2012 */
static void msr_set_bit(unsigned int reg, unsigned int bit)
{
msr_t msr = rdmsr(reg);
if (bit < 32) {
if (msr.lo & (1 << bit))
return;
msr.lo |= 1 << bit;
} else {
if (msr.hi & (1 << (bit - 32)))
return;
msr.hi |= 1 << (bit - 32);
}
wrmsr(reg, msr);
}
void intel_model_206ax_finalize_smm(void)
{
/* Lock C-State MSR */
msr_set_bit(MSR_PKG_CST_CONFIG_CONTROL, 15);
/* Lock AES-NI only if supported */
if (cpuid_ecx(1) & (1 << 25))
msr_set_bit(MSR_FEATURE_CONFIG, 0);
#ifdef LOCK_POWER_CONTROL_REGISTERS
/*
* Lock the power control registers.
*
* These registers can be left unlocked if modifying power
* limits from the OS is desirable. Modifying power limits
* from the OS can be especially useful for experimentation
* during early phases of system bringup while the thermal
* power envelope is being proven.
*/
msr_set_bit(MSR_PP0_CURRENT_CONFIG, 31);
msr_set_bit(MSR_PP1_CURRENT_CONFIG, 31);
msr_set_bit(MSR_PKG_POWER_LIMIT, 63);
msr_set_bit(MSR_PP0_POWER_LIMIT, 31);
msr_set_bit(MSR_PP1_POWER_LIMIT, 31);
#endif
/* Lock TM interrupts - route thermal events to all processors */
msr_set_bit(MSR_MISC_PWR_MGMT, 22);
/* Lock memory configuration to protect SMM */
msr_set_bit(MSR_LT_LOCK_MEMORY, 0);
}
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