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