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