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MIPS: Support hard limit of cpu count (nr_cpu_ids)
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1/*
2 * This file is subject to the terms and conditions of the GNU General
3 * Public License. See the file "COPYING" in the main directory of this
4 * archive for more details.
5 *
6 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
7 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
8 * Copyright (C) 2000, 2001, 2002 Ralf Baechle
9 * Copyright (C) 2000, 2001 Broadcom Corporation
10 */
11#ifndef __ASM_SMP_H
12#define __ASM_SMP_H
13
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14#include <linux/bitops.h>
15#include <linux/linkage.h>
631330f5 16#include <linux/smp.h>
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17#include <linux/threads.h>
18#include <linux/cpumask.h>
87353d8a 19
60063497 20#include <linux/atomic.h>
87353d8a 21#include <asm/smp-ops.h>
1da177e4 22
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23extern int smp_num_siblings;
24extern cpumask_t cpu_sibling_map[];
25
39c715b7 26#define raw_smp_processor_id() (current_thread_info()->cpu)
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27
28/* Map from cpu id to sequential logical cpu number. This will only
70342287 29 not be idempotent when cpus failed to come on-line. */
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30extern int __cpu_number_map[NR_CPUS];
31#define cpu_number_map(cpu) __cpu_number_map[cpu]
32
33/* The reverse map from sequential logical cpu number to cpu id. */
34extern int __cpu_logical_map[NR_CPUS];
35#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
36
37#define NO_PROC_ID (-1)
38
70342287 39#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
1da177e4 40#define SMP_CALL_FUNCTION 0x2
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41/* Octeon - Tell another core to flush its icache */
42#define SMP_ICACHE_FLUSH 0x4
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43/* Used by kexec crashdump to save all cpu's state */
44#define SMP_DUMP 0x8
c4a987db 45#define SMP_ASK_C0COUNT 0x10
ddcdb1b4 46
773cb77d 47extern volatile cpumask_t cpu_callin_map;
1da177e4 48
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49/* Mask of CPUs which are currently definitely operating coherently */
50extern cpumask_t cpu_coherent_mask;
51
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52extern void asmlinkage smp_bootstrap(void);
53
54/*
55 * this function sends a 'reschedule' IPI to another CPU.
56 * it goes straight through and wastes no time serializing
57 * anything. Worst case is that we lose a reschedule ...
58 */
59static inline void smp_send_reschedule(int cpu)
60{
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61 extern struct plat_smp_ops *mp_ops; /* private */
62
63 mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
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64}
65
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66#ifdef CONFIG_HOTPLUG_CPU
67static inline int __cpu_disable(void)
68{
70342287 69 extern struct plat_smp_ops *mp_ops; /* private */
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70
71 return mp_ops->cpu_disable();
72}
73
74static inline void __cpu_die(unsigned int cpu)
75{
70342287 76 extern struct plat_smp_ops *mp_ops; /* private */
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77
78 mp_ops->cpu_die(cpu);
79}
80
81extern void play_dead(void);
82#endif
83
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84extern asmlinkage void smp_call_function_interrupt(void);
85
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86static inline void arch_send_call_function_single_ipi(int cpu)
87{
70342287 88 extern struct plat_smp_ops *mp_ops; /* private */
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89
90 mp_ops->send_ipi_mask(&cpumask_of_cpu(cpu), SMP_CALL_FUNCTION);
91}
92
93static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
94{
70342287 95 extern struct plat_smp_ops *mp_ops; /* private */
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96
97 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
98}
2f304c0a 99
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100#if defined(CONFIG_KEXEC)
101extern void (*dump_ipi_function_ptr)(void *);
102void dump_send_ipi(void (*dump_ipi_callback)(void *));
103#endif
1da177e4 104#endif /* __ASM_SMP_H */