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