arch/powerpc/platforms/chrp/smp.c

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