eb50439b92
It turns out that the logical CPU mapping is useful even when !CONFIG_SMP for manipulation of devices like interrupt and power controllers when running a UP kernel on a CPU other than 0. This can happen when kexecing a UP image from an SMP kernel. In the future, multi-cluster systems running AMP configurations will require something similar for mapping cluster IDs, so it makes sense to decouple this logic in preparation for this support. Acked-by: Yang Bai <hamo.by@gmail.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Reported-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
/*
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* arch/arm/include/asm/smp.h
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*
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* Copyright (C) 2004-2005 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARM_SMP_H
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#define __ASM_ARM_SMP_H
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#include <linux/thread_info.h>
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#ifndef CONFIG_SMP
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# error "<asm/smp.h> included in non-SMP build"
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#endif
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#define raw_smp_processor_id() (current_thread_info()->cpu)
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struct seq_file;
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/*
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* generate IPI list text
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*/
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extern void show_ipi_list(struct seq_file *, int);
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/*
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* Called from assembly code, this handles an IPI.
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*/
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asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
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/*
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* Called from C code, this handles an IPI.
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*/
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void handle_IPI(int ipinr, struct pt_regs *regs);
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/*
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* Setup the set of possible CPUs (via set_cpu_possible)
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*/
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extern void smp_init_cpus(void);
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/*
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* Provide a function to raise an IPI cross call on CPUs in callmap.
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*/
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extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
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/*
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* Boot a secondary CPU, and assign it the specified idle task.
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* This also gives us the initial stack to use for this CPU.
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*/
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extern int boot_secondary(unsigned int cpu, struct task_struct *);
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/*
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* Called from platform specific assembly code, this is the
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* secondary CPU entry point.
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*/
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asmlinkage void secondary_start_kernel(void);
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/*
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* Perform platform specific initialisation of the specified CPU.
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*/
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extern void platform_secondary_init(unsigned int cpu);
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/*
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* Initialize cpu_possible map, and enable coherency
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*/
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extern void platform_smp_prepare_cpus(unsigned int);
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/*
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* Initial data for bringing up a secondary CPU.
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*/
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struct secondary_data {
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unsigned long pgdir;
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unsigned long swapper_pg_dir;
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void *stack;
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};
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extern struct secondary_data secondary_data;
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extern int __cpu_disable(void);
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extern int platform_cpu_disable(unsigned int cpu);
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extern void __cpu_die(unsigned int cpu);
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extern void cpu_die(void);
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extern void platform_cpu_die(unsigned int cpu);
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extern int platform_cpu_kill(unsigned int cpu);
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extern void platform_cpu_enable(unsigned int cpu);
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extern void arch_send_call_function_single_ipi(int cpu);
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extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
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#endif /* ifndef __ASM_ARM_SMP_H */
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