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smp.h
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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 ([email protected])
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/bitops.h>
15 #include <linux/linkage.h>
16 #include <linux/smp.h>
17 #include <linux/threads.h>
18 #include <linux/cpumask.h>
19 
20 #include <linux/atomic.h>
21 #include <asm/smp-ops.h>
22 
23 extern int smp_num_siblings;
24 extern cpumask_t cpu_sibling_map[];
25 
26 #define raw_smp_processor_id() (current_thread_info()->cpu)
27 
28 /* Map from cpu id to sequential logical cpu number. This will only
29  not be idempotent when cpus failed to come on-line. */
30 extern 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. */
34 extern int __cpu_logical_map[NR_CPUS];
35 #define cpu_logical_map(cpu) __cpu_logical_map[cpu]
36 
37 #define NO_PROC_ID (-1)
38 
39 #define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
40 #define SMP_CALL_FUNCTION 0x2
41 /* Octeon - Tell another core to flush its icache */
42 #define SMP_ICACHE_FLUSH 0x4
43 
44 extern volatile cpumask_t cpu_callin_map;
45 
46 extern void asmlinkage smp_bootstrap(void);
47 
48 /*
49  * this function sends a 'reschedule' IPI to another CPU.
50  * it goes straight through and wastes no time serializing
51  * anything. Worst case is that we lose a reschedule ...
52  */
53 static inline void smp_send_reschedule(int cpu)
54 {
55  extern struct plat_smp_ops *mp_ops; /* private */
56 
57  mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
58 }
59 
60 #ifdef CONFIG_HOTPLUG_CPU
61 static inline int __cpu_disable(void)
62 {
63  extern struct plat_smp_ops *mp_ops; /* private */
64 
65  return mp_ops->cpu_disable();
66 }
67 
68 static inline void __cpu_die(unsigned int cpu)
69 {
70  extern struct plat_smp_ops *mp_ops; /* private */
71 
72  mp_ops->cpu_die(cpu);
73 }
74 
75 extern void play_dead(void);
76 #endif
77 
78 extern asmlinkage void smp_call_function_interrupt(void);
79 
80 static inline void arch_send_call_function_single_ipi(int cpu)
81 {
82  extern struct plat_smp_ops *mp_ops; /* private */
83 
84  mp_ops->send_ipi_mask(&cpumask_of_cpu(cpu), SMP_CALL_FUNCTION);
85 }
86 
87 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
88 {
89  extern struct plat_smp_ops *mp_ops; /* private */
90 
91  mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
92 }
93 
94 #endif /* __ASM_SMP_H */