1/* SPDX-License-Identifier: GPL-2.0 */
  2/*
  3 * SMP Support
  4 *
  5 * Copyright (C) 1999 VA Linux Systems
  6 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  7 * (c) Copyright 2001-2003, 2005 Hewlett-Packard Development Company, L.P.
  8 *	David Mosberger-Tang <davidm@hpl.hp.com>
  9 *	Bjorn Helgaas <bjorn.helgaas@hp.com>
 10 */
 11#ifndef _ASM_IA64_SMP_H
 12#define _ASM_IA64_SMP_H
 13
 14#include <linux/init.h>
 15#include <linux/threads.h>
 16#include <linux/kernel.h>
 17#include <linux/cpumask.h>
 18#include <linux/bitops.h>
 19#include <linux/irqreturn.h>
 20
 21#include <asm/param.h>
 22#include <asm/processor.h>
 23#include <asm/ptrace.h>
 24
 25static inline unsigned int
 26ia64_get_lid (void)
 27{
 28	union {
 29		struct {
 30			unsigned long reserved : 16;
 31			unsigned long eid : 8;
 32			unsigned long id : 8;
 33			unsigned long ignored : 32;
 34		} f;
 35		unsigned long bits;
 36	} lid;
 37
 38	lid.bits = ia64_getreg(_IA64_REG_CR_LID);
 39	return lid.f.id << 8 | lid.f.eid;
 40}
 41
 42#define hard_smp_processor_id()		ia64_get_lid()
 43
 44#ifdef CONFIG_SMP
 45
 46#define raw_smp_processor_id() (current_thread_info()->cpu)
 47
 48extern struct smp_boot_data {
 49	int cpu_count;
 50	int cpu_phys_id[NR_CPUS];
 51} smp_boot_data __initdata;
 52
 53extern char no_int_routing;
 54
 55extern cpumask_t cpu_core_map[NR_CPUS];
 56DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
 57extern int smp_num_siblings;
 58extern void __iomem *ipi_base_addr;
 59
 60extern volatile int ia64_cpu_to_sapicid[];
 61#define cpu_physical_id(i)	ia64_cpu_to_sapicid[i]
 62
 63extern unsigned long ap_wakeup_vector;
 64
 65/*
 66 * Function to map hard smp processor id to logical id.  Slow, so don't use this in
 67 * performance-critical code.
 68 */
 69static inline int
 70cpu_logical_id (int cpuid)
 71{
 72	int i;
 73
 74	for (i = 0; i < NR_CPUS; ++i)
 75		if (cpu_physical_id(i) == cpuid)
 76			break;
 77	return i;
 78}
 79
 80/* Upping and downing of CPUs */
 81extern int __cpu_disable (void);
 82extern void __cpu_die (unsigned int cpu);
 83extern void cpu_die (void) __attribute__ ((noreturn));
 84extern void __init smp_build_cpu_map(void);
 85
 86extern void __init init_smp_config (void);
 87extern void smp_do_timer (struct pt_regs *regs);
 88
 89extern irqreturn_t handle_IPI(int irq, void *dev_id);
 90extern void smp_send_reschedule (int cpu);
 91extern void identify_siblings (struct cpuinfo_ia64 *);
 92extern int is_multithreading_enabled(void);
 93
 94extern void arch_send_call_function_single_ipi(int cpu);
 95extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
 96
 97#else /* CONFIG_SMP */
 98
 99#define cpu_logical_id(i)		0
100#define cpu_physical_id(i)		ia64_get_lid()
101
102#endif /* CONFIG_SMP */
103#endif /* _ASM_IA64_SMP_H */