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/* SPDX-License-Identifier: GPL-2.0 */
* SMP Support
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999 Walt Drummond <>
* (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
* David Mosberger-Tang <>
* Bjorn Helgaas <>
#ifndef _ASM_IA64_SMP_H
#define _ASM_IA64_SMP_H
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/kernel.h>
#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <linux/irqreturn.h>
#include <asm/param.h>
#include <asm/processor.h>
#include <asm/ptrace.h>
static inline unsigned int
ia64_get_lid (void)
union {
struct {
unsigned long reserved : 16;
unsigned long eid : 8;
unsigned long id : 8;
unsigned long ignored : 32;
} f;
unsigned long bits;
} lid;
lid.bits = ia64_getreg(_IA64_REG_CR_LID);
return << 8 | lid.f.eid;
#define hard_smp_processor_id() ia64_get_lid()
#define raw_smp_processor_id() (current_thread_info()->cpu)
extern struct smp_boot_data {
int cpu_count;
int cpu_phys_id[NR_CPUS];
} smp_boot_data __initdata;
extern char no_int_routing;
extern cpumask_t cpu_core_map[NR_CPUS];
DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
extern int smp_num_siblings;
extern void __iomem *ipi_base_addr;
extern volatile int ia64_cpu_to_sapicid[];
#define cpu_physical_id(i) ia64_cpu_to_sapicid[i]
extern unsigned long ap_wakeup_vector;
* Function to map hard smp processor id to logical id. Slow, so don't use this in
* performance-critical code.
static inline int
cpu_logical_id (int cpuid)
int i;
for (i = 0; i < NR_CPUS; ++i)
if (cpu_physical_id(i) == cpuid)
return i;
/* Upping and downing of CPUs */
extern int __cpu_disable (void);
extern void __cpu_die (unsigned int cpu);
extern void cpu_die (void) __attribute__ ((noreturn));
extern void __init smp_build_cpu_map(void);
extern void __init init_smp_config (void);
extern void smp_do_timer (struct pt_regs *regs);
extern irqreturn_t handle_IPI(int irq, void *dev_id);
extern void smp_send_reschedule (int cpu);
extern void identify_siblings (struct cpuinfo_ia64 *);
extern int is_multithreading_enabled(void);
extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
#else /* CONFIG_SMP */
#define cpu_logical_id(i) 0
#define cpu_physical_id(i) ia64_get_lid()
#endif /* CONFIG_SMP */
#endif /* _ASM_IA64_SMP_H */