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 unsigned int smp_max_threads __initdata; 61 62 extern asmlinkage void smp_bootstrap(void); 63 64 extern void calculate_cpu_foreign_map(void); 65 66 /* 67 * this function sends a 'reschedule' IPI to another CPU. 68 * it goes straight through and wastes no time serializing 69 * anything. Worst case is that we lose a reschedule ... 70 */ 71 static inline void arch_smp_send_reschedule(int cpu) 72 { 73 extern const struct plat_smp_ops *mp_ops; /* private */ 74 75 mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF); 76 } 77 78 #ifdef CONFIG_HOTPLUG_CPU 79 static inline int __cpu_disable(void) 80 { 81 extern const struct plat_smp_ops *mp_ops; /* private */ 82 83 return mp_ops->cpu_disable(); 84 } 85 86 static inline void __cpu_die(unsigned int cpu) 87 { 88 extern const struct plat_smp_ops *mp_ops; /* private */ 89 90 mp_ops->cpu_die(cpu); 91 } 92 93 extern void __noreturn play_dead(void); 94 #endif 95 96 #ifdef CONFIG_KEXEC 97 static inline void kexec_nonboot_cpu(void) 98 { 99 extern const struct plat_smp_ops *mp_ops; /* private */ 100 101 return mp_ops->kexec_nonboot_cpu(); 102 } 103 104 static inline void *kexec_nonboot_cpu_func(void) 105 { 106 extern const struct plat_smp_ops *mp_ops; /* private */ 107 108 return mp_ops->kexec_nonboot_cpu; 109 } 110 #endif 111 112 /* 113 * This function will set up the necessary IPIs for Linux to communicate 114 * with the CPUs in mask. 115 * Return 0 on success. 116 */ 117 int mips_smp_ipi_allocate(const struct cpumask *mask); 118 119 /* 120 * This function will free up IPIs allocated with mips_smp_ipi_allocate to the 121 * CPUs in mask, which must be a subset of the IPIs that have been configured. 122 * Return 0 on success. 123 */ 124 int mips_smp_ipi_free(const struct cpumask *mask); 125 126 static inline void arch_send_call_function_single_ipi(int cpu) 127 { 128 extern const struct plat_smp_ops *mp_ops; /* private */ 129 130 mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION); 131 } 132 133 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) 134 { 135 extern const struct plat_smp_ops *mp_ops; /* private */ 136 137 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION); 138 } 139 140 #endif /* __ASM_SMP_H */ 141