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 static 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. */ 42 extern 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. */ 46 extern 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 */ 58 extern cpumask_t cpu_coherent_mask; 59 60 extern asmlinkage void smp_bootstrap(void); 61 62 extern 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 */ 69 static 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 77 static 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 84 static 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 91 extern void play_dead(void); 92 #endif 93 94 #ifdef CONFIG_KEXEC 95 static 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 } 101 102 static 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 */ 115 int 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 */ 122 int mips_smp_ipi_free(const struct cpumask *mask); 123 124 static 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 } 130 131 static 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