3
* This file is subject to the terms and conditions of the GNU General Public
4
* License. See the file "COPYING" in the main directory of this archive
7
* Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
11
#ifndef _ASM_IA64_SN_SN_CPUID_H
12
#define _ASM_IA64_SN_SN_CPUID_H
14
#include <linux/smp.h>
15
#include <asm/sn/addrs.h>
16
#include <asm/sn/pda.h>
17
#include <asm/intrinsics.h>
21
* Functions for converting between cpuids, nodeids and NASIDs.
23
* These are for SGI platforms only.
31
* Definitions of terms (these definitions are for IA64 ONLY. Other architectures
32
* use cpuid/cpunum quite defferently):
34
* CPUID - a number in range of 0..NR_CPUS-1 that uniquely identifies
35
* the cpu. The value cpuid has no significance on IA64 other than
37
* smp_processor_id() returns the cpuid of the current cpu.
39
* CPU_PHYSICAL_ID (also known as HARD_PROCESSOR_ID)
40
* This is the same as 31:24 of the processor LID register
41
* hard_smp_processor_id()- cpu_physical_id of current processor
42
* cpu_physical_id(cpuid) - convert a <cpuid> to a <physical_cpuid>
43
* cpu_logical_id(phy_id) - convert a <physical_cpuid> to a <cpuid>
44
* * not real efficient - don't use in perf critical code
46
* SLICE - a number in the range of 0 - 3 (typically) that represents the
47
* cpu number on a brick.
49
* SUBNODE - (almost obsolete) the number of the FSB that a cpu is
50
* connected to. This is also the same as the PI number. Usually 0 or 1.
52
* NOTE!!!: the value of the bits in the cpu physical id (SAPICid or LID) of a cpu has no
53
* significance. The SAPIC id (LID) is a 16-bit cookie that has meaning only to the PROM.
56
* The macros convert between cpu physical ids & slice/nasid/cnodeid.
57
* These terms are described below:
61
* ----- ----- ----- ----- CPU
62
* | 0 | | 1 | | 0 | | 1 | SLICE
63
* ----- ----- ----- -----
66
* 0 | | 2 0 | | 2 FSB SLOT
71
* ------------ -------------
73
* | SHUB | | SHUB | NASID (0..MAX_NASIDS)
74
* | |----- | | CNODEID (0..num_compact_nodes-1)
77
* ------------ -------------
83
#define get_node_number(addr) NASID_GET(addr)
86
* NOTE: on non-MP systems, only cpuid 0 exists
89
extern short physical_node_map[]; /* indexed by nasid to get cnode */
92
* Macros for retrieving info about current cpu
94
#define get_nasid() (sn_nodepda->phys_cpuid[smp_processor_id()].nasid)
95
#define get_subnode() (sn_nodepda->phys_cpuid[smp_processor_id()].subnode)
96
#define get_slice() (sn_nodepda->phys_cpuid[smp_processor_id()].slice)
97
#define get_cnode() (sn_nodepda->phys_cpuid[smp_processor_id()].cnode)
98
#define get_sapicid() ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff)
101
* Macros for retrieving info about an arbitrary cpu
102
* cpuid - logical cpu id
104
#define cpuid_to_nasid(cpuid) (sn_nodepda->phys_cpuid[cpuid].nasid)
105
#define cpuid_to_subnode(cpuid) (sn_nodepda->phys_cpuid[cpuid].subnode)
106
#define cpuid_to_slice(cpuid) (sn_nodepda->phys_cpuid[cpuid].slice)
110
* Dont use the following in performance critical code. They require scans
111
* of potentially large tables.
113
extern int nasid_slice_to_cpuid(int, int);
116
* cnodeid_to_nasid - convert a cnodeid to a NASID
118
#define cnodeid_to_nasid(cnodeid) (sn_cnodeid_to_nasid[cnodeid])
121
* nasid_to_cnodeid - convert a NASID to a cnodeid
123
#define nasid_to_cnodeid(nasid) (physical_node_map[nasid])
126
* partition_coherence_id - get the coherence ID of the current partition
128
extern u8 sn_coherency_id;
129
#define partition_coherence_id() (sn_coherency_id)
131
#endif /* _ASM_IA64_SN_SN_CPUID_H */