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/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 23extern int smp_num_siblings; 24extern cpumask_t cpu_sibling_map[]; 25extern cpumask_t cpu_core_map[]; 26extern cpumask_t cpu_foreign_map[]; 27 28static inline int raw_smp_processor_id(void) 29{ 30#if defined(__VDSO__) 31 extern int vdso_smp_processor_id(void) 32 __compiletime_error("VDSO should not call smp_processor_id()"); 33 return vdso_smp_processor_id(); 34#else 35 return current_thread_info()->cpu; 36#endif 37} 38#define raw_smp_processor_id raw_smp_processor_id 39 40/* Map from cpu id to sequential logical cpu number. This will only 41 not be idempotent when cpus failed to come on-line. */ 42extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP]; 43#define cpu_number_map(cpu) __cpu_number_map[cpu] 44 45/* The reverse map from sequential logical cpu number to cpu id. */ 46extern int __cpu_logical_map[NR_CPUS]; 47#define cpu_logical_map(cpu) __cpu_logical_map[cpu] 48 49#define NO_PROC_ID (-1) 50 51#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */ 52#define SMP_CALL_FUNCTION 0x2 53/* Octeon - Tell another core to flush its icache */ 54#define SMP_ICACHE_FLUSH 0x4 55#define SMP_ASK_C0COUNT 0x8 56 57/* Mask of CPUs which are currently definitely operating coherently */ 58extern cpumask_t cpu_coherent_mask; 59 60extern asmlinkage void smp_bootstrap(void); 61 62extern void calculate_cpu_foreign_map(void); 63 64/* 65 * this function sends a 'reschedule' IPI to another CPU. 66 * it goes straight through and wastes no time serializing 67 * anything. Worst case is that we lose a reschedule ... 68 */ 69static inline void smp_send_reschedule(int cpu) 70{ 71 extern const struct plat_smp_ops *mp_ops; /* private */ 72 73 mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF); 74} 75 76#ifdef CONFIG_HOTPLUG_CPU 77static inline int __cpu_disable(void) 78{ 79 extern const struct plat_smp_ops *mp_ops; /* private */ 80 81 return mp_ops->cpu_disable(); 82} 83 84static inline void __cpu_die(unsigned int cpu) 85{ 86 extern const struct plat_smp_ops *mp_ops; /* private */ 87 88 mp_ops->cpu_die(cpu); 89} 90 91extern void play_dead(void); 92#endif 93 94#ifdef CONFIG_KEXEC 95static inline void kexec_nonboot_cpu(void) 96{ 97 extern const struct plat_smp_ops *mp_ops; /* private */ 98 99 return mp_ops->kexec_nonboot_cpu(); 100} 101 102static inline void *kexec_nonboot_cpu_func(void) 103{ 104 extern const struct plat_smp_ops *mp_ops; /* private */ 105 106 return mp_ops->kexec_nonboot_cpu; 107} 108#endif 109 110/* 111 * This function will set up the necessary IPIs for Linux to communicate 112 * with the CPUs in mask. 113 * Return 0 on success. 114 */ 115int mips_smp_ipi_allocate(const struct cpumask *mask); 116 117/* 118 * This function will free up IPIs allocated with mips_smp_ipi_allocate to the 119 * CPUs in mask, which must be a subset of the IPIs that have been configured. 120 * Return 0 on success. 121 */ 122int mips_smp_ipi_free(const struct cpumask *mask); 123 124static inline void arch_send_call_function_single_ipi(int cpu) 125{ 126 extern const struct plat_smp_ops *mp_ops; /* private */ 127 128 mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION); 129} 130 131static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) 132{ 133 extern const struct plat_smp_ops *mp_ops; /* private */ 134 135 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION); 136} 137 138#endif /* __ASM_SMP_H */ 139