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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
14#include <linux/compiler.h>
15#include <linux/linkage.h>
16#include <linux/threads.h>
17#include <linux/cpumask.h>
18
19#include <asm/smp-ops.h>
20
21extern int smp_num_siblings;
22extern cpumask_t cpu_sibling_map[];
23extern cpumask_t cpu_core_map[];
24extern cpumask_t cpu_foreign_map[];
25
26static inline int raw_smp_processor_id(void)
27{
28#if defined(__VDSO__)
29 extern int vdso_smp_processor_id(void)
30 __compiletime_error("VDSO should not call smp_processor_id()");
31 return vdso_smp_processor_id();
32#else
33 return current_thread_info()->cpu;
34#endif
35}
36#define raw_smp_processor_id raw_smp_processor_id
37
38/* Map from cpu id to sequential logical cpu number. This will only
39 not be idempotent when cpus failed to come on-line. */
40extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
41#define cpu_number_map(cpu) __cpu_number_map[cpu]
42
43/* The reverse map from sequential logical cpu number to cpu id. */
44extern int __cpu_logical_map[NR_CPUS];
45#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
46
47#define NO_PROC_ID (-1)
48
49#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
50#define SMP_CALL_FUNCTION 0x2
51/* Octeon - Tell another core to flush its icache */
52#define SMP_ICACHE_FLUSH 0x4
53
54/* Mask of CPUs which are currently definitely operating coherently */
55extern cpumask_t cpu_coherent_mask;
56
57extern unsigned int smp_max_threads __initdata;
58
59extern asmlinkage void smp_bootstrap(void);
60
61extern void calculate_cpu_foreign_map(void);
62
63asmlinkage void start_secondary(void);
64
65/*
66 * this function sends a 'reschedule' IPI to another CPU.
67 * it goes straight through and wastes no time serializing
68 * anything. Worst case is that we lose a reschedule ...
69 */
70static inline void arch_smp_send_reschedule(int cpu)
71{
72 extern const struct plat_smp_ops *mp_ops; /* private */
73
74 mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
75}
76
77#ifdef CONFIG_HOTPLUG_CPU
78static inline int __cpu_disable(void)
79{
80 extern const struct plat_smp_ops *mp_ops; /* private */
81
82 return mp_ops->cpu_disable();
83}
84
85static inline void __cpu_die(unsigned int cpu)
86{
87 extern const struct plat_smp_ops *mp_ops; /* private */
88
89 mp_ops->cpu_die(cpu);
90}
91
92extern void __noreturn play_dead(void);
93#endif
94
95#ifdef CONFIG_KEXEC_CORE
96static inline void kexec_nonboot_cpu(void)
97{
98 extern const struct plat_smp_ops *mp_ops; /* private */
99
100 return mp_ops->kexec_nonboot_cpu();
101}
102
103static inline void *kexec_nonboot_cpu_func(void)
104{
105 extern const struct plat_smp_ops *mp_ops; /* private */
106
107 return mp_ops->kexec_nonboot_cpu;
108}
109#endif
110
111/*
112 * This function will set up the necessary IPIs for Linux to communicate
113 * with the CPUs in mask.
114 * Return 0 on success.
115 */
116int mips_smp_ipi_allocate(const struct cpumask *mask);
117
118/*
119 * This function will free up IPIs allocated with mips_smp_ipi_allocate to the
120 * CPUs in mask, which must be a subset of the IPIs that have been configured.
121 * Return 0 on success.
122 */
123int mips_smp_ipi_free(const struct cpumask *mask);
124
125static inline void arch_send_call_function_single_ipi(int cpu)
126{
127 extern const struct plat_smp_ops *mp_ops; /* private */
128
129 mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION);
130}
131
132static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
133{
134 extern const struct plat_smp_ops *mp_ops; /* private */
135
136 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
137}
138
139#endif /* __ASM_SMP_H */