1/*
2 *
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
5 * for more details.
6 *
7 * Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
8 */
9
10
11#ifndef _ASM_IA64_SN_SN_CPUID_H
12#define _ASM_IA64_SN_SN_CPUID_H
13
14#include <linux/smp.h>
15#include <asm/sn/addrs.h>
16#include <asm/sn/pda.h>
17#include <asm/intrinsics.h>
18
19
20/*
21 * Functions for converting between cpuids, nodeids and NASIDs.
22 *
23 * These are for SGI platforms only.
24 *
25 */
26
27
28
29
30/*
31 *  Definitions of terms (these definitions are for IA64 ONLY. Other architectures
32 *  use cpuid/cpunum quite defferently):
33 *
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
36 *		the boot cpu is 0.
37 *			smp_processor_id() returns the cpuid of the current cpu.
38 *
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
45 *
46 *         SLICE - a number in the range of 0 - 3 (typically) that represents the
47 *		cpu number on a brick.
48 *
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.
51 *
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.
54 *
55 *
56 * The macros convert between cpu physical ids & slice/nasid/cnodeid.
57 * These terms are described below:
58 *
59 *
60 * Brick
61 *          -----   -----           -----   -----       CPU
62 *          | 0 |   | 1 |           | 0 |   | 1 |       SLICE
63 *          -----   -----           -----   -----
64 *            |       |               |       |
65 *            |       |               |       |
66 *          0 |       | 2           0 |       | 2       FSB SLOT
67 *             -------                 -------
68 *                |                       |
69 *                |                       |
70 *                |                       |
71 *             ------------      -------------
72 *             |          |      |           |
73 *             |    SHUB  |      |   SHUB    |        NASID   (0..MAX_NASIDS)
74 *             |          |----- |           |        CNODEID (0..num_compact_nodes-1)
75 *             |          |      |           |
76 *             |          |      |           |
77 *             ------------      -------------
78 *                   |                 |
79 *
80 *
81 */
82
83#define get_node_number(addr)			NASID_GET(addr)
84
85/*
86 * NOTE: on non-MP systems, only cpuid 0 exists
87 */
88
89extern short physical_node_map[];	/* indexed by nasid to get cnode */
90
91/*
92 * Macros for retrieving info about current cpu
93 */
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)
99
100/*
101 * Macros for retrieving info about an arbitrary cpu
102 *	cpuid - logical cpu id
103 */
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)
107
108
109/*
110 * Dont use the following in performance critical code. They require scans
111 * of potentially large tables.
112 */
113extern int nasid_slice_to_cpuid(int, int);
114
115/*
116 * cnodeid_to_nasid - convert a cnodeid to a NASID
117 */
118#define cnodeid_to_nasid(cnodeid)	(sn_cnodeid_to_nasid[cnodeid])
119
120/*
121 * nasid_to_cnodeid - convert a NASID to a cnodeid
122 */
123#define nasid_to_cnodeid(nasid)		(physical_node_map[nasid])
124
125/*
126 * partition_coherence_id - get the coherence ID of the current partition
127 */
128extern u8 sn_coherency_id;
129#define partition_coherence_id()	(sn_coherency_id)
130
131#endif /* _ASM_IA64_SN_SN_CPUID_H */
132