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| Rev | Author | Line No. | Line |
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| 422 | giacomo | 1 | /* |
| 2 | * linux/include/asm-i386/topology.h |
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| 3 | * |
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| 4 | * Written by: Matthew Dobson, IBM Corporation |
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| 5 | * |
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| 6 | * Copyright (C) 2002, IBM Corp. |
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| 7 | * |
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| 8 | * All rights reserved. |
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| 9 | * |
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| 10 | * This program is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; either version 2 of the License, or |
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| 13 | * (at your option) any later version. |
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| 14 | * |
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| 15 | * This program is distributed in the hope that it will be useful, but |
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| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
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| 18 | * NON INFRINGEMENT. See the GNU General Public License for more |
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| 19 | * details. |
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| 20 | * |
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| 21 | * You should have received a copy of the GNU General Public License |
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| 22 | * along with this program; if not, write to the Free Software |
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| 23 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 24 | * |
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| 25 | * Send feedback to <colpatch@us.ibm.com> |
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| 26 | */ |
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| 27 | #ifndef _ASM_I386_TOPOLOGY_H |
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| 28 | #define _ASM_I386_TOPOLOGY_H |
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| 29 | |||
| 30 | #ifdef CONFIG_NUMA |
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| 31 | |||
| 32 | #include <asm/mpspec.h> |
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| 33 | |||
| 34 | #include <linux/cpumask.h> |
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| 35 | |||
| 36 | /* Mappings between logical cpu number and node number */ |
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| 37 | extern cpumask_t node_2_cpu_mask[]; |
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| 38 | extern int cpu_2_node[]; |
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| 39 | |||
| 40 | /* Returns the number of the node containing CPU 'cpu' */ |
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| 41 | static inline int cpu_to_node(int cpu) |
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| 42 | { |
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| 43 | return cpu_2_node[cpu]; |
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| 44 | } |
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| 45 | |||
| 46 | /* Returns the number of the node containing MemBlk 'memblk' */ |
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| 47 | #define memblk_to_node(memblk) (memblk) |
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| 48 | |||
| 49 | /* Returns the number of the node containing Node 'node'. This architecture is flat, |
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| 50 | so it is a pretty simple function! */ |
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| 51 | #define parent_node(node) (node) |
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| 52 | |||
| 53 | /* Returns a bitmask of CPUs on Node 'node'. */ |
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| 54 | static inline cpumask_t node_to_cpumask(int node) |
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| 55 | { |
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| 56 | return node_2_cpu_mask[node]; |
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| 57 | } |
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| 58 | |||
| 59 | /* Returns the number of the first CPU on Node 'node'. */ |
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| 60 | static inline int node_to_first_cpu(int node) |
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| 61 | { |
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| 62 | cpumask_t mask = node_to_cpumask(node); |
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| 63 | return first_cpu(mask); |
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| 64 | } |
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| 65 | |||
| 66 | /* Returns the number of the first MemBlk on Node 'node' */ |
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| 67 | #define node_to_memblk(node) (node) |
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| 68 | |||
| 69 | /* Returns the number of the node containing PCI bus 'bus' */ |
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| 70 | static inline cpumask_t pcibus_to_cpumask(int bus) |
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| 71 | { |
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| 72 | return node_to_cpumask(mp_bus_id_to_node[bus]); |
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| 73 | } |
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| 74 | |||
| 75 | /* Cross-node load balancing interval. */ |
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| 76 | #define NODE_BALANCE_RATE 100 |
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| 77 | |||
| 78 | #else /* !CONFIG_NUMA */ |
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| 79 | /* |
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| 80 | * Other i386 platforms should define their own version of the |
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| 81 | * above macros here. |
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| 82 | */ |
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| 83 | |||
| 84 | #include <asm-generic/topology.h> |
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| 85 | |||
| 86 | #endif /* CONFIG_NUMA */ |
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| 87 | |||
| 88 | #endif /* _ASM_I386_TOPOLOGY_H */ |