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Diffstat (limited to 'arch/ia64/include/asm/sn/sn_cpuid.h')
| -rw-r--r-- | arch/ia64/include/asm/sn/sn_cpuid.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/ia64/include/asm/sn/sn_cpuid.h b/arch/ia64/include/asm/sn/sn_cpuid.h new file mode 100644 index 000000000000..a676dd9ace3e --- /dev/null +++ b/arch/ia64/include/asm/sn/sn_cpuid.h @@ -0,0 +1,132 @@ +/* + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved. + */ + + +#ifndef _ASM_IA64_SN_SN_CPUID_H +#define _ASM_IA64_SN_SN_CPUID_H + +#include <linux/smp.h> +#include <asm/sn/addrs.h> +#include <asm/sn/pda.h> +#include <asm/intrinsics.h> + + +/* + * Functions for converting between cpuids, nodeids and NASIDs. + * + * These are for SGI platforms only. + * + */ + + + + +/* + * Definitions of terms (these definitions are for IA64 ONLY. Other architectures + * use cpuid/cpunum quite defferently): + * + * CPUID - a number in range of 0..NR_CPUS-1 that uniquely identifies + * the cpu. The value cpuid has no significance on IA64 other than + * the boot cpu is 0. + * smp_processor_id() returns the cpuid of the current cpu. + * + * CPU_PHYSICAL_ID (also known as HARD_PROCESSOR_ID) + * This is the same as 31:24 of the processor LID register + * hard_smp_processor_id()- cpu_physical_id of current processor + * cpu_physical_id(cpuid) - convert a <cpuid> to a <physical_cpuid> + * cpu_logical_id(phy_id) - convert a <physical_cpuid> to a <cpuid> + * * not real efficient - don't use in perf critical code + * + * SLICE - a number in the range of 0 - 3 (typically) that represents the + * cpu number on a brick. + * + * SUBNODE - (almost obsolete) the number of the FSB that a cpu is + * connected to. This is also the same as the PI number. Usually 0 or 1. + * + * NOTE!!!: the value of the bits in the cpu physical id (SAPICid or LID) of a cpu has no + * significance. The SAPIC id (LID) is a 16-bit cookie that has meaning only to the PROM. + * + * + * The macros convert between cpu physical ids & slice/nasid/cnodeid. + * These terms are described below: + * + * + * Brick + * ----- ----- ----- ----- CPU + * | 0 | | 1 | | 0 | | 1 | SLICE + * ----- ----- ----- ----- + * | | | | + * | | | | + * 0 | | 2 0 | | 2 FSB SLOT + * ------- ------- + * | | + * | | + * | | + * ------------ ------------- + * | | | | + * | SHUB | | SHUB | NASID (0..MAX_NASIDS) + * | |----- | | CNODEID (0..num_compact_nodes-1) + * | | | | + * | | | | + * ------------ ------------- + * | | + * + * + */ + +#define get_node_number(addr) NASID_GET(addr) + +/* + * NOTE: on non-MP systems, only cpuid 0 exists + */ + +extern short physical_node_map[]; /* indexed by nasid to get cnode */ + +/* + * Macros for retrieving info about current cpu + */ +#define get_nasid() (sn_nodepda->phys_cpuid[smp_processor_id()].nasid) +#define get_subnode() (sn_nodepda->phys_cpuid[smp_processor_id()].subnode) +#define get_slice() (sn_nodepda->phys_cpuid[smp_processor_id()].slice) +#define get_cnode() (sn_nodepda->phys_cpuid[smp_processor_id()].cnode) +#define get_sapicid() ((ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff) + +/* + * Macros for retrieving info about an arbitrary cpu + * cpuid - logical cpu id + */ +#define cpuid_to_nasid(cpuid) (sn_nodepda->phys_cpuid[cpuid].nasid) +#define cpuid_to_subnode(cpuid) (sn_nodepda->phys_cpuid[cpuid].subnode) +#define cpuid_to_slice(cpuid) (sn_nodepda->phys_cpuid[cpuid].slice) + + +/* + * Dont use the following in performance critical code. They require scans + * of potentially large tables. + */ +extern int nasid_slice_to_cpuid(int, int); + +/* + * cnodeid_to_nasid - convert a cnodeid to a NASID + */ +#define cnodeid_to_nasid(cnodeid) (sn_cnodeid_to_nasid[cnodeid]) + +/* + * nasid_to_cnodeid - convert a NASID to a cnodeid + */ +#define nasid_to_cnodeid(nasid) (physical_node_map[nasid]) + +/* + * partition_coherence_id - get the coherence ID of the current partition + */ +extern u8 sn_coherency_id; +#define partition_coherence_id() (sn_coherency_id) + +#endif /* _ASM_IA64_SN_SN_CPUID_H */ + |