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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 */ |