arch/powerpc/platforms/chrp/smp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Smp support for CHRP machines.
   4  *
   5  * Written by Cort Dougan (cort@cs.nmt.edu) borrowing a great
   6  * deal of code from the sparc and intel versions.
   7  *
   8  * Copyright (C) 1999 Cort Dougan <cort@cs.nmt.edu>
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/smp.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/kernel_stat.h>
  17 #include <linux/delay.h>
  18 #include <linux/spinlock.h>
  19
  20 #include <asm/ptrace.h>
  21 #include <linux/atomic.h>
  22 #include <asm/irq.h>
  23 #include <asm/page.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/sections.h>
  26 #include <asm/io.h>
  27 #include <asm/prom.h>
  28 #include <asm/smp.h>
  29 #include <asm/machdep.h>
  30 #include <asm/mpic.h>
  31 #include <asm/rtas.h>
  32
  33 static int smp_chrp_kick_cpu(int nr)
  34 {
  35         *(unsigned long *)KERNELBASE = nr;
  36         asm volatile("dcbf 0,%0"::"r"(KERNELBASE):"memory");
  37
  38         return 0;
  39 }
  40
  41 static void smp_chrp_setup_cpu(int cpu_nr)
  42 {
  43         mpic_setup_this_cpu();
  44 }
  45
  46 /* CHRP with openpic */
  47 struct smp_ops_t chrp_smp_ops = {
  48         .cause_nmi_ipi = NULL,
  49         .message_pass = smp_mpic_message_pass,
  50         .probe = smp_mpic_probe,
  51         .kick_cpu = smp_chrp_kick_cpu,
  52         .setup_cpu = smp_chrp_setup_cpu,
  53         .give_timebase = rtas_give_timebase,
  54         .take_timebase = rtas_take_timebase,
  55 };