src/cpu/amd/dualcore/dualcore_id.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2004 Yinghai Lu
 *
 * 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 <arch/cpu.h>
#include <cpu/amd/multicore.h>
#ifdef __PRE_RAM__
#include <cpu/amd/msr.h>
#endif

//called by bus_cpu_scan too
unsigned int read_nb_cfg_54(void)
{
	msr_t msr;
	msr = rdmsr(NB_CFG_MSR);
	return ( ( msr.hi >> (54-32)) & 1);
}

u32 get_initial_apicid(void)
{
	return ((cpuid_ebx(1) >> 24) & 0xf);
}

//called by amd_siblings too
#define CORE_ID_BIT 1
#define NODE_ID_BIT 3
struct node_core_id get_node_core_id(unsigned nb_cfg_54)
{
	struct node_core_id id;
	//    get the apicid via cpuid(1) ebx[27:24]
	if ( nb_cfg_54) {
		//   when NB_CFG[54] is set, nodeid = ebx[27:25], coreid = ebx[24]
		id.coreid = (cpuid_ebx(1) >> 24) & 0xf;
		id.nodeid = (id.coreid>>CORE_ID_BIT);
		id.coreid &= ((1 << CORE_ID_BIT)-1);
	}
	else
	{
		// when NB_CFG[54] is clear, nodeid = ebx[26:24], coreid = ebx[27]
		id.nodeid = (cpuid_ebx(1) >> 24) & 0xf;
		id.coreid = (id.nodeid>>NODE_ID_BIT);
		id.nodeid &= ((1 << NODE_ID_BIT)-1);
	}
	return id;
}

static inline unsigned get_core_num(void)
{
	return (cpuid_ecx(0x80000008) & 0xff);
}

struct node_core_id get_node_core_id_x(void)
{

	return get_node_core_id(read_nb_cfg_54()); // for pre_e0() nb_cfg_54 always be 0
}