LXR linux/arch/ia64/include/asm/smp.h

   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 */
 104