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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SMP_H
   3#define __ASM_SMP_H
   4
   5#include <linux/threads.h>
   6#include <linux/cpumask.h>
   7#include <linux/bitops.h>
   8#include <asm/pal.h>
   9
  10/* HACK: Cabrio WHAMI return value is bogus if more than 8 bits used.. :-( */
  11
  12static __inline__ unsigned char
  13__hard_smp_processor_id(void)
  14{
  15        register unsigned char __r0 __asm__("$0");
  16        __asm__ __volatile__(
  17                "call_pal %1 #whami"
  18                : "=r"(__r0)
  19                :"i" (PAL_whami)
  20                : "$1", "$22", "$23", "$24", "$25");
  21        return __r0;
  22}
  23
  24#ifdef CONFIG_SMP
  25
  26#include <asm/irq.h>
  27
  28struct cpuinfo_alpha {
  29        unsigned long loops_per_jiffy;
  30        unsigned long last_asn;
  31        int need_new_asn;
  32        int asn_lock;
  33        unsigned long ipi_count;
  34        unsigned long prof_multiplier;
  35        unsigned long prof_counter;
  36        unsigned char mcheck_expected;
  37        unsigned char mcheck_taken;
  38        unsigned char mcheck_extra;
  39} __attribute__((aligned(64)));
  40
  41extern struct cpuinfo_alpha cpu_data[NR_CPUS];
  42
  43#define hard_smp_processor_id() __hard_smp_processor_id()
  44#define raw_smp_processor_id()  (current_thread_info()->cpu)
  45
  46extern int smp_num_cpus;
  47
  48extern void arch_send_call_function_single_ipi(int cpu);
  49extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  50
  51#else /* CONFIG_SMP */
  52
  53#define hard_smp_processor_id()         0
  54#define smp_call_function_on_cpu(func,info,wait,cpu)    ({ 0; })
  55
  56#endif /* CONFIG_SMP */
  57
  58#define NO_PROC_ID      (-1)
  59
  60#endif
  61