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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 
89 extern 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  */
113 extern 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  */
128 extern u8 sn_coherency_id;
129 #define partition_coherence_id()	(sn_coherency_id)
130 
131 #endif /* _ASM_IA64_SN_SN_CPUID_H */
132 
133