| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 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) 2000-2004 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/config.h> |
| 15 | #include <linux/smp.h> |
| 16 | #include <asm/sn/addrs.h> |
| 17 | #include <asm/sn/pda.h> |
| 18 | #include <asm/intrinsics.h> |
| 19 | |
| 20 | |
| 21 | /* |
| 22 | * Functions for converting between cpuids, nodeids and NASIDs. |
| 23 | * |
| 24 | * These are for SGI platforms only. |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | |
| 29 | |
| 30 | |
| 31 | /* |
| 32 | * Definitions of terms (these definitions are for IA64 ONLY. Other architectures |
| 33 | * use cpuid/cpunum quite defferently): |
| 34 | * |
| 35 | * CPUID - a number in range of 0..NR_CPUS-1 that uniquely identifies |
| 36 | * the cpu. The value cpuid has no significance on IA64 other than |
| 37 | * the boot cpu is 0. |
| 38 | * smp_processor_id() returns the cpuid of the current cpu. |
| 39 | * |
| 40 | * CPU_PHYSICAL_ID (also known as HARD_PROCESSOR_ID) |
| 41 | * This is the same as 31:24 of the processor LID register |
| 42 | * hard_smp_processor_id()- cpu_physical_id of current processor |
| 43 | * cpu_physical_id(cpuid) - convert a <cpuid> to a <physical_cpuid> |
| 44 | * cpu_logical_id(phy_id) - convert a <physical_cpuid> to a <cpuid> |
| 45 | * * not real efficient - don't use in perf critical code |
| 46 | * |
| 47 | * SLICE - a number in the range of 0 - 3 (typically) that represents the |
| 48 | * cpu number on a brick. |
| 49 | * |
| 50 | * SUBNODE - (almost obsolete) the number of the FSB that a cpu is |
| 51 | * connected to. This is also the same as the PI number. Usually 0 or 1. |
| 52 | * |
| 53 | * NOTE!!!: the value of the bits in the cpu physical id (SAPICid or LID) of a cpu has no |
| 54 | * significance. The SAPIC id (LID) is a 16-bit cookie that has meaning only to the PROM. |
| 55 | * |
| 56 | * |
| 57 | * The macros convert between cpu physical ids & slice/nasid/cnodeid. |
| 58 | * These terms are described below: |
| 59 | * |
| 60 | * |
| 61 | * Brick |
| 62 | * ----- ----- ----- ----- CPU |
| 63 | * | 0 | | 1 | | 0 | | 1 | SLICE |
| 64 | * ----- ----- ----- ----- |
| 65 | * | | | | |
| 66 | * | | | | |
| 67 | * 0 | | 2 0 | | 2 FSB SLOT |
| 68 | * ------- ------- |
| 69 | * | | |
| 70 | * | | |
| 71 | * | | |
| 72 | * ------------ ------------- |
| 73 | * | | | | |
| 74 | * | SHUB | | SHUB | NASID (0..MAX_NASIDS) |
| 75 | * | |----- | | CNODEID (0..num_compact_nodes-1) |
| 76 | * | | | | |
| 77 | * | | | | |
| 78 | * ------------ ------------- |
| 79 | * | | |
| 80 | * |
| 81 | * |
| 82 | */ |
| 83 | |
| 84 | #ifndef CONFIG_SMP |
| 85 | #define cpu_physical_id(cpuid) ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff) |
| 86 | #endif |
| 87 | |
| 88 | |
| 89 | #define get_node_number(addr) NASID_GET(addr) |
| 90 | |
| 91 | /* |
| 92 | * NOTE: on non-MP systems, only cpuid 0 exists |
| 93 | */ |
| 94 | |
| 95 | extern short physical_node_map[]; /* indexed by nasid to get cnode */ |
| 96 | |
| 97 | /* |
| 98 | * Macros for retrieving info about current cpu |
| 99 | */ |
| 100 | #define get_nasid() (nodepda->phys_cpuid[smp_processor_id()].nasid) |
| 101 | #define get_subnode() (nodepda->phys_cpuid[smp_processor_id()].subnode) |
| 102 | #define get_slice() (nodepda->phys_cpuid[smp_processor_id()].slice) |
| 103 | #define get_cnode() (nodepda->phys_cpuid[smp_processor_id()].cnode) |
| 104 | #define get_sapicid() ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff) |
| 105 | |
| 106 | /* |
| 107 | * Macros for retrieving info about an arbitrary cpu |
| 108 | * cpuid - logical cpu id |
| 109 | */ |
| 110 | #define cpuid_to_nasid(cpuid) (nodepda->phys_cpuid[cpuid].nasid) |
| 111 | #define cpuid_to_subnode(cpuid) (nodepda->phys_cpuid[cpuid].subnode) |
| 112 | #define cpuid_to_slice(cpuid) (nodepda->phys_cpuid[cpuid].slice) |
| 113 | #define cpuid_to_cnodeid(cpuid) (physical_node_map[cpuid_to_nasid(cpuid)]) |
| 114 | |
| 115 | |
| 116 | /* |
| 117 | * Dont use the following in performance critical code. They require scans |
| 118 | * of potentially large tables. |
| 119 | */ |
| 120 | extern int nasid_slice_to_cpuid(int, int); |
| 121 | #define nasid_slice_to_cpu_physical_id(nasid, slice) \ |
| 122 | cpu_physical_id(nasid_slice_to_cpuid(nasid, slice)) |
| 123 | |
| 124 | /* |
| 125 | * cnodeid_to_nasid - convert a cnodeid to a NASID |
| 126 | * Macro relies on pg_data for a node being on the node itself. |
| 127 | * Just extract the NASID from the pointer. |
| 128 | * |
| 129 | */ |
| 130 | #define cnodeid_to_nasid(cnodeid) pda->cnodeid_to_nasid_table[cnodeid] |
| 131 | |
| 132 | /* |
| 133 | * nasid_to_cnodeid - convert a NASID to a cnodeid |
| 134 | */ |
| 135 | #define nasid_to_cnodeid(nasid) (physical_node_map[nasid]) |
| 136 | |
| 137 | /* |
| 138 | * partition_coherence_id - get the coherence ID of the current partition |
| 139 | */ |
| 140 | extern u8 sn_coherency_id; |
| 141 | #define partition_coherence_id() (sn_coherency_id) |
| 142 | |
| 143 | #endif /* _ASM_IA64_SN_SN_CPUID_H */ |
| 144 | |