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/*
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
*/
#ifndef _ASM_IA64_SN_SN_CPUID_H
#define _ASM_IA64_SN_SN_CPUID_H
#include <linux/smp.h>
#include <asm/sn/addrs.h>
#include <asm/sn/pda.h>
#include <asm/intrinsics.h>
/*
* Functions for converting between cpuids, nodeids and NASIDs.
*
* These are for SGI platforms only.
*
*/
/*
* Definitions of terms (these definitions are for IA64 ONLY. Other architectures
* use cpuid/cpunum quite defferently):
*
* CPUID - a number in range of 0..NR_CPUS-1 that uniquely identifies
* the cpu. The value cpuid has no significance on IA64 other than
* the boot cpu is 0.
* smp_processor_id() returns the cpuid of the current cpu.
*
* CPU_PHYSICAL_ID (also known as HARD_PROCESSOR_ID)
* This is the same as 31:24 of the processor LID register
* hard_smp_processor_id()- cpu_physical_id of current processor
* cpu_physical_id(cpuid) - convert a <cpuid> to a <physical_cpuid>
* cpu_logical_id(phy_id) - convert a <physical_cpuid> to a <cpuid>
* * not real efficient - don't use in perf critical code
*
* SLICE - a number in the range of 0 - 3 (typically) that represents the
* cpu number on a brick.
*
* SUBNODE - (almost obsolete) the number of the FSB that a cpu is
* connected to. This is also the same as the PI number. Usually 0 or 1.
*
* NOTE!!!: the value of the bits in the cpu physical id (SAPICid or LID) of a cpu has no
* significance. The SAPIC id (LID) is a 16-bit cookie that has meaning only to the PROM.
*
*
* The macros convert between cpu physical ids & slice/nasid/cnodeid.
* These terms are described below:
*
*
* Brick
* ----- ----- ----- ----- CPU
* | 0 | | 1 | | 0 | | 1 | SLICE
* ----- ----- ----- -----
* | | | |
* | | | |
* 0 | | 2 0 | | 2 FSB SLOT
* ------- -------
* | |
* | |
* | |
* ------------ -------------
* | | | |
* | SHUB | | SHUB | NASID (0..MAX_NASIDS)
* | |----- | | CNODEID (0..num_compact_nodes-1)
* | | | |
* | | | |
* ------------ -------------
* | |
*
*
*/
#define get_node_number(addr) NASID_GET(addr)
/*
* NOTE: on non-MP systems, only cpuid 0 exists
*/
extern short physical_node_map[]; /* indexed by nasid to get cnode */
/*
* Macros for retrieving info about current cpu
*/
#define get_nasid() (sn_nodepda->phys_cpuid[smp_processor_id()].nasid)
#define get_subnode() (sn_nodepda->phys_cpuid[smp_processor_id()].subnode)
#define get_slice() (sn_nodepda->phys_cpuid[smp_processor_id()].slice)
#define get_cnode() (sn_nodepda->phys_cpuid[smp_processor_id()].cnode)
#define get_sapicid() ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
/*
* Macros for retrieving info about an arbitrary cpu
* cpuid - logical cpu id
*/
#define cpuid_to_nasid(cpuid) (sn_nodepda->phys_cpuid[cpuid].nasid)
#define cpuid_to_subnode(cpuid) (sn_nodepda->phys_cpuid[cpuid].subnode)
#define cpuid_to_slice(cpuid) (sn_nodepda->phys_cpuid[cpuid].slice)
/*
* Dont use the following in performance critical code. They require scans
* of potentially large tables.
*/
extern int nasid_slice_to_cpuid(int, int);
/*
* cnodeid_to_nasid - convert a cnodeid to a NASID
*/
#define cnodeid_to_nasid(cnodeid) (sn_cnodeid_to_nasid[cnodeid])
/*
* nasid_to_cnodeid - convert a NASID to a cnodeid
*/
#define nasid_to_cnodeid(nasid) (physical_node_map[nasid])
/*
* partition_coherence_id - get the coherence ID of the current partition
*/
extern u8 sn_coherency_id;
#define partition_coherence_id() (sn_coherency_id)
#endif /* _ASM_IA64_SN_SN_CPUID_H */
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