arch/ia64/include/asm/sn/sn_cpuid.h

   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