/* * This file is subject to the terms and conditions of the GNU General * Public License. See the file "COPYING" in the main directory of this * archive for more details. * * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com) * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc. * Copyright (C) 2000, 2001, 2002 Ralf Baechle * Copyright (C) 2000, 2001 Broadcom Corporation */ #ifndef __ASM_SMP_H #define __ASM_SMP_H #ifdef CONFIG_SMP #include <linux/bitops.h> #include <linux/linkage.h> #include <linux/threads.h> #include <linux/cpumask.h> #include <asm/atomic.h> #define raw_smp_processor_id() (current_thread_info()->cpu) /* Map from cpu id to sequential logical cpu number. This will only not be idempotent when cpus failed to come on-line. */ extern int __cpu_number_map[NR_CPUS]; #define cpu_number_map(cpu) __cpu_number_map[cpu] /* The reverse map from sequential logical cpu number to cpu id. */ extern int __cpu_logical_map[NR_CPUS]; #define cpu_logical_map(cpu) __cpu_logical_map[cpu] #define NO_PROC_ID (-1) struct call_data_struct { void (*func)(void *); void *info; atomic_t started; atomic_t finished; int wait; }; extern struct call_data_struct *call_data; #define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */ #define SMP_CALL_FUNCTION 0x2 extern cpumask_t phys_cpu_present_map; #define cpu_possible_map phys_cpu_present_map extern cpumask_t cpu_callout_map; /* We don't mark CPUs online until __cpu_up(), so we need another measure */ static inline int num_booting_cpus(void) { return cpus_weight(cpu_callout_map); } /* * These are defined by the board-specific code. */ /* * Cause the function described by call_data to be executed on the passed * cpu. When the function has finished, increment the finished field of * call_data. */ extern void core_send_ipi(int cpu, unsigned int action); /* * Firmware CPU startup hook */ extern void prom_boot_secondary(int cpu, struct task_struct *idle); /* * After we've done initial boot, this function is called to allow the * board code to clean up state, if needed */ extern void prom_init_secondary(void); /* * Populate cpu_possible_map before smp_init, called from setup_arch. */ extern void plat_smp_setup(void); /* * Called in smp_prepare_cpus. */ extern void plat_prepare_cpus(unsigned int max_cpus); /* * Last chance for the board code to finish SMP initialization before * the CPU is "online". */ extern void prom_smp_finish(void); /* Hook for after all CPUs are online */ extern void prom_cpus_done(void); extern void asmlinkage smp_bootstrap(void); /* * this function sends a 'reschedule' IPI to another CPU. * it goes straight through and wastes no time serializing * anything. Worst case is that we lose a reschedule ... */ static inline void smp_send_reschedule(int cpu) { core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF); } extern asmlinkage void smp_call_function_interrupt(void); #endif /* CONFIG_SMP */ #endif /* __ASM_SMP_H */