Linux-2.6.12-rc2
[linux-2.6/kvm.git] / include / asm-mips / 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.
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
11 #ifndef __ASM_SMP_H
12 #define __ASM_SMP_H
14 #include <linux/config.h>
16 #ifdef CONFIG_SMP
18 #include <linux/bitops.h>
19 #include <linux/linkage.h>
20 #include <linux/threads.h>
21 #include <linux/cpumask.h>
22 #include <asm/atomic.h>
24 #define smp_processor_id() (current_thread_info()->cpu)
26 /* Map from cpu id to sequential logical cpu number. This will only
27 not be idempotent when cpus failed to come on-line. */
28 extern int __cpu_number_map[NR_CPUS];
29 #define cpu_number_map(cpu) __cpu_number_map[cpu]
31 /* The reverse map from sequential logical cpu number to cpu id. */
32 extern int __cpu_logical_map[NR_CPUS];
33 #define cpu_logical_map(cpu) __cpu_logical_map[cpu]
35 #define NO_PROC_ID (-1)
37 struct call_data_struct {
38 void (*func)(void *);
39 void *info;
40 atomic_t started;
41 atomic_t finished;
42 int wait;
45 extern struct call_data_struct *call_data;
47 #define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
48 #define SMP_CALL_FUNCTION 0x2
50 extern cpumask_t phys_cpu_present_map;
51 extern cpumask_t cpu_online_map;
52 #define cpu_possible_map phys_cpu_present_map
54 extern cpumask_t cpu_callout_map;
55 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
56 static inline int num_booting_cpus(void)
58 return cpus_weight(cpu_callout_map);
61 /* These are defined by the board-specific code. */
64 * Cause the function described by call_data to be executed on the passed
65 * cpu. When the function has finished, increment the finished field of
66 * call_data.
68 extern void core_send_ipi(int cpu, unsigned int action);
71 * Firmware CPU startup hook
73 extern void prom_boot_secondary(int cpu, struct task_struct *idle);
76 * After we've done initial boot, this function is called to allow the
77 * board code to clean up state, if needed
79 extern void prom_init_secondary(void);
82 * Detect available CPUs, populate phys_cpu_present_map before smp_init
84 extern void prom_prepare_cpus(unsigned int max_cpus);
87 * Last chance for the board code to finish SMP initialization before
88 * the CPU is "online".
90 extern void prom_smp_finish(void);
92 /* Hook for after all CPUs are online */
93 extern void prom_cpus_done(void);
95 extern void asmlinkage smp_bootstrap(void);
98 * this function sends a 'reschedule' IPI to another CPU.
99 * it goes straight through and wastes no time serializing
100 * anything. Worst case is that we lose a reschedule ...
102 static inline void smp_send_reschedule(int cpu)
104 core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
107 extern asmlinkage void smp_call_function_interrupt(void);
109 #endif /* CONFIG_SMP */
111 #endif /* __ASM_SMP_H */