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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2015-2016 Intel Corp.
* (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
* (Written by Alexandru Gagniuc <alexandrux.gagniuc@intel.com> for Intel Corp.)
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <console/console.h>
#include <cpu/cpu.h>
#include <cpu/x86/cache.h>
#include <cpu/x86/mp.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <device/device.h>
#include <device/pci.h>
#include <soc/cpu.h>
static struct device_operations cpu_dev_ops = {
.init = DEVICE_NOOP,
};
static struct cpu_device_id cpu_table[] = {
{ X86_VENDOR_INTEL, CPUID_APOLLOLAKE_A0 },
{ X86_VENDOR_INTEL, CPUID_APOLLOLAKE_B0 },
{ 0, 0 },
};
static const struct cpu_driver driver __cpu_driver = {
.ops = &cpu_dev_ops,
.id_table = cpu_table,
};
static void read_cpu_topology(unsigned int *num_phys, unsigned int *num_virt)
{
msr_t msr;
msr = rdmsr(MSR_CORE_THREAD_COUNT);
*num_virt = (msr.lo >> 0) & 0xffff;
*num_phys = (msr.lo >> 16) & 0xffff;
}
/*
* Do essential initialization tasks before APs can be fired up
*
* 1. Prevent race condition in MTRR solution. Enable MTRRs on the BSP. This
* creates the MTRR solution that the APs will use. Otherwise APs will try to
* apply the incomplete solution as the BSP is calculating it.
*/
static void pre_mp_init(void)
{
x86_setup_mtrrs_with_detect();
x86_mtrr_check();
}
/* Find CPU topology */
static int get_cpu_count(void)
{
unsigned int num_virt_cores, num_phys_cores;
read_cpu_topology(&num_phys_cores, &num_virt_cores);
printk(BIOS_DEBUG, "Detected %u core, %u thread CPU.\n",
num_phys_cores, num_virt_cores);
return num_virt_cores;
}
/*
* CPU initialization recipe
*
* Note that no microcode update is passed to the init function. CSE updates
* the microcode on all cores before releasing them from reset. That means that
* the BSP and all APs will come up with the same microcode revision.
*/
static const struct mp_ops mp_ops = {
.pre_mp_init = pre_mp_init,
.get_cpu_count = get_cpu_count,
};
void apollolake_init_cpus(device_t dev)
{
/* Clear for take-off */
if (mp_init_with_smm(dev->link_list, &mp_ops) < 0)
printk(BIOS_ERR, "MP initialization failure.\n");
}
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