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
  25 static inline unsigned int
  26 ia64_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
  48 extern struct smp_boot_data {
  49         int cpu_count;
  50         int cpu_phys_id[NR_CPUS];
  51 } smp_boot_data __initdata;
  52
  53 extern char no_int_routing;
  54
  55 extern cpumask_t cpu_core_map[NR_CPUS];
  56 DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
  57 extern int smp_num_siblings;
  58 extern void __iomem *ipi_base_addr;
  59
  60 extern volatile int ia64_cpu_to_sapicid[];
  61 #define cpu_physical_id(i)      ia64_cpu_to_sapicid[i]
  62
  63 extern 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  */
  69 static inline int
  70 cpu_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 */
  81 extern int __cpu_disable (void);
  82 extern void __cpu_die (unsigned int cpu);
  83 extern void cpu_die (void) __attribute__ ((noreturn));
  84 extern void __init smp_build_cpu_map(void);
  85
  86 extern void __init init_smp_config (void);
  87 extern void smp_do_timer (struct pt_regs *regs);
  88
  89 extern irqreturn_t handle_IPI(int irq, void *dev_id);
  90 extern void smp_send_reschedule (int cpu);
  91 extern void identify_siblings (struct cpuinfo_ia64 *);
  92 extern int is_multithreading_enabled(void);
  93
  94 extern void arch_send_call_function_single_ipi(int cpu);
  95 extern 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 */