projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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/config.h> | |
| 15 | ||
| 16 | #ifdef CONFIG_SMP | |
| 17 | ||
| 18 | #include <linux/bitops.h> | |
| 19 | #include <linux/linkage.h> | |
| 20 | #include <linux/threads.h> | |
| 21 | #include <linux/cpumask.h> | |
| 22 | #include <asm/atomic.h> | |
| 23 | ||
| 24 | #define smp_processor_id() (current_thread_info()->cpu) | |
| 25 | ||
| 26 | /* Map from cpu id to sequential logical cpu number. This will only | |
| 27 | not be idempotent when cpus failed to come on-line. */ | |
| 28 | extern int __cpu_number_map[NR_CPUS]; | |
| 29 | #define cpu_number_map(cpu) __cpu_number_map[cpu] | |
| 30 | ||
| 31 | /* The reverse map from sequential logical cpu number to cpu id. */ | |
| 32 | extern int __cpu_logical_map[NR_CPUS]; | |
| 33 | #define cpu_logical_map(cpu) __cpu_logical_map[cpu] | |
| 34 | ||
| 35 | #define NO_PROC_ID (-1) | |
| 36 | ||
| 37 | struct call_data_struct { | |
| 38 | void (*func)(void *); | |
| 39 | void *info; | |
| 40 | atomic_t started; | |
| 41 | atomic_t finished; | |
| 42 | int wait; | |
| 43 | }; | |
| 44 | ||
| 45 | extern struct call_data_struct *call_data; | |
| 46 | ||
| 47 | #define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */ | |
| 48 | #define SMP_CALL_FUNCTION 0x2 | |
| 49 | ||
| 50 | extern cpumask_t phys_cpu_present_map; | |
| 51 | extern cpumask_t cpu_online_map; | |
| 52 | #define cpu_possible_map phys_cpu_present_map | |
| 53 | ||
| 54 | extern cpumask_t cpu_callout_map; | |
| 55 | /* We don't mark CPUs online until __cpu_up(), so we need another measure */ | |
| 56 | static inline int num_booting_cpus(void) | |
| 57 | { | |
| 58 | return cpus_weight(cpu_callout_map); | |
| 59 | } | |
| 60 | ||
| 61 | /* These are defined by the board-specific code. */ | |
| 62 | ||
| 63 | /* | |
| 64 | * Cause the function described by call_data to be executed on the passed | |
| 65 | * cpu. When the function has finished, increment the finished field of | |
| 66 | * call_data. | |
| 67 | */ | |
| 68 | extern void core_send_ipi(int cpu, unsigned int action); | |
| 69 | ||
| 70 | /* | |
| 71 | * Firmware CPU startup hook | |
| 72 | */ | |
| 73 | extern void prom_boot_secondary(int cpu, struct task_struct *idle); | |
| 74 | ||
| 75 | /* | |
| 76 | * After we've done initial boot, this function is called to allow the | |
| 77 | * board code to clean up state, if needed | |
| 78 | */ | |
| 79 | extern void prom_init_secondary(void); | |
| 80 | ||
| 81 | /* | |
| 82 | * Detect available CPUs, populate phys_cpu_present_map before smp_init | |
| 83 | */ | |
| 84 | extern void prom_prepare_cpus(unsigned int max_cpus); | |
| 85 | ||
| 86 | /* | |
| 87 | * Last chance for the board code to finish SMP initialization before | |
| 88 | * the CPU is "online". | |
| 89 | */ | |
| 90 | extern void prom_smp_finish(void); | |
| 91 | ||
| 92 | /* Hook for after all CPUs are online */ | |
| 93 | extern void prom_cpus_done(void); | |
| 94 | ||
| 95 | extern void asmlinkage smp_bootstrap(void); | |
| 96 | ||
| 97 | /* | |
| 98 | * this function sends a 'reschedule' IPI to another CPU. | |
| 99 | * it goes straight through and wastes no time serializing | |
| 100 | * anything. Worst case is that we lose a reschedule ... | |
| 101 | */ | |
| 102 | static inline void smp_send_reschedule(int cpu) | |
| 103 | { | |
| 104 | core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF); | |
| 105 | } | |
| 106 | ||
| 107 | extern asmlinkage void smp_call_function_interrupt(void); | |
| 108 | ||
| 109 | #endif /* CONFIG_SMP */ | |
| 110 | ||
| 111 | #endif /* __ASM_SMP_H */ |