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
15#ifdef CONFIG_SMP
16
17#include <linux/bitops.h>
18#include <linux/linkage.h>
19#include <linux/threads.h>
20#include <linux/cpumask.h>
21#include <asm/atomic.h>
22
23#define raw_smp_processor_id() (current_thread_info()->cpu)
24
25/* Map from cpu id to sequential logical cpu number.  This will only
26   not be idempotent when cpus failed to come on-line.  */
27extern int __cpu_number_map[NR_CPUS];
28#define cpu_number_map(cpu)  __cpu_number_map[cpu]
29
30/* The reverse map from sequential logical cpu number to cpu id.  */
31extern int __cpu_logical_map[NR_CPUS];
32#define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
33
34#define NO_PROC_ID	(-1)
35
36struct call_data_struct {
37	void		(*func)(void *);
38	void		*info;
39	atomic_t	started;
40	atomic_t	finished;
41	int		wait;
42};
43
44extern struct call_data_struct *call_data;
45
46#define SMP_RESCHEDULE_YOURSELF	0x1
47#define SMP_CALL_FUNCTION	0x2
48
49extern cpumask_t phys_cpu_present_map;
50#define cpu_possible_map	phys_cpu_present_map
51
52extern cpumask_t cpu_callout_map;
53/* We don't mark CPUs online until __cpu_up(), so we need another measure */
54static inline int num_booting_cpus(void)
55{
56	return cpus_weight(cpu_callout_map);
57}
58
59/*
60 * These are defined by the board-specific code.
61 */
62
63/*
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.
67 */
68extern void core_send_ipi(int cpu, unsigned int action);
69
70/*
71 * Firmware CPU startup hook
72 */
73extern void prom_boot_secondary(int cpu, struct task_struct *idle);
74
75/*
76 *  After we've done initial boot, this function is called to allow the
77 *  board code to clean up state, if needed
78 */
79extern void prom_init_secondary(void);
80
81/*
82 * Populate cpu_possible_map before smp_init, called from setup_arch.
83 */
84extern void plat_smp_setup(void);
85
86/*
87 * Called in smp_prepare_cpus.
88 */
89extern void plat_prepare_cpus(unsigned int max_cpus);
90
91/*
92 * Last chance for the board code to finish SMP initialization before
93 * the CPU is "online".
94 */
95extern void prom_smp_finish(void);
96
97/* Hook for after all CPUs are online */
98extern void prom_cpus_done(void);
99
100extern void asmlinkage smp_bootstrap(void);
101
102/*
103 * this function sends a 'reschedule' IPI to another CPU.
104 * it goes straight through and wastes no time serializing
105 * anything. Worst case is that we lose a reschedule ...
106 */
107static inline void smp_send_reschedule(int cpu)
108{
109	core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
110}
111
112extern asmlinkage void smp_call_function_interrupt(void);
113
114#endif /* CONFIG_SMP */
115
116#endif /* __ASM_SMP_H */
117