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/compiler.h> 15 #include <linux/linkage.h> 16 #include <linux/threads.h> 17 #include <linux/cpumask.h> 18 19 #include <asm/smp-ops.h> 20 21 extern int smp_num_siblings; 22 extern cpumask_t cpu_sibling_map[]; 23 extern cpumask_t cpu_core_map[]; 24 extern cpumask_t cpu_foreign_map[]; 25 26 static inline int raw_smp_processor_id(void) 27 { 28 #if defined(__VDSO__) 29 extern int vdso_smp_processor_id(void) 30 __compiletime_error("VDSO should not call smp_processor_id()"); 31 return vdso_smp_processor_id(); 32 #else 33 return current_thread_info()->cpu; 34 #endif 35 } 36 #define raw_smp_processor_id raw_smp_processor_id 37 38 /* Map from cpu id to sequential logical cpu number. This will only 39 not be idempotent when cpus failed to come on-line. */ 40 extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP]; 41 #define cpu_number_map(cpu) __cpu_number_map[cpu] 42 43 /* The reverse map from sequential logical cpu number to cpu id. */ 44 extern int __cpu_logical_map[NR_CPUS]; 45 #define cpu_logical_map(cpu) __cpu_logical_map[cpu] 46 47 #define NO_PROC_ID (-1) 48 49 #define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */ 50 #define SMP_CALL_FUNCTION 0x2 51 /* Octeon - Tell another core to flush its icache */ 52 #define SMP_ICACHE_FLUSH 0x4 53 /* Loongson64 - Self IPI for IRQ work */ 54 #define SMP_IRQ_WORK 0x8 55 56 /* Mask of CPUs which are currently definitely operating coherently */ 57 extern cpumask_t cpu_coherent_mask; 58 59 extern unsigned int smp_max_threads __initdata; 60 61 extern asmlinkage void smp_bootstrap(void); 62 63 extern void calculate_cpu_foreign_map(void); 64 65 asmlinkage void start_secondary(void); 66 67 /* 68 * this function sends a 'reschedule' IPI to another CPU. 69 * it goes straight through and wastes no time serializing 70 * anything. Worst case is that we lose a reschedule ... 71 */ 72 static inline void arch_smp_send_reschedule(int cpu) 73 { 74 extern const struct plat_smp_ops *mp_ops; /* private */ 75 76 mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF); 77 } 78 79 #ifdef CONFIG_HOTPLUG_CPU 80 static inline int __cpu_disable(void) 81 { 82 extern const struct plat_smp_ops *mp_ops; /* private */ 83 84 return mp_ops->cpu_disable(); 85 } 86 87 static inline void __cpu_die(unsigned int cpu) 88 { 89 extern const struct plat_smp_ops *mp_ops; /* private */ 90 91 mp_ops->cpu_die(cpu); 92 } 93 94 extern void __noreturn play_dead(void); 95 #endif 96 97 #ifdef CONFIG_KEXEC_CORE 98 static inline void kexec_nonboot_cpu(void) 99 { 100 extern const struct plat_smp_ops *mp_ops; /* private */ 101 102 return mp_ops->kexec_nonboot_cpu(); 103 } 104 105 static inline void *kexec_nonboot_cpu_func(void) 106 { 107 extern const struct plat_smp_ops *mp_ops; /* private */ 108 109 return mp_ops->kexec_nonboot_cpu; 110 } 111 #endif 112 113 /* 114 * This function will set up the necessary IPIs for Linux to communicate 115 * with the CPUs in mask. 116 * Return 0 on success. 117 */ 118 int mips_smp_ipi_allocate(const struct cpumask *mask); 119 120 /* 121 * This function will free up IPIs allocated with mips_smp_ipi_allocate to the 122 * CPUs in mask, which must be a subset of the IPIs that have been configured. 123 * Return 0 on success. 124 */ 125 int mips_smp_ipi_free(const struct cpumask *mask); 126 127 static inline void arch_send_call_function_single_ipi(int cpu) 128 { 129 extern const struct plat_smp_ops *mp_ops; /* private */ 130 131 mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION); 132 } 133 134 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) 135 { 136 extern const struct plat_smp_ops *mp_ops; /* private */ 137 138 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION); 139 } 140 141 #endif /* __ASM_SMP_H */ 142