arch/arm/mach-vexpress/platsmp.c

   1 /*
   2  *  linux/arch/arm/mach-vexpress/platsmp.c
   3  *
   4  *  Copyright (C) 2002 ARM Ltd.
   5  *  All Rights Reserved
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/init.h>
  12 #include <linux/errno.h>
  13 #include <linux/smp.h>
  14 #include <linux/io.h>
  15
  16 #include <mach/motherboard.h>
  17 #define V2M_PA_CS7 0x10000000
  18
  19 #include "core.h"
  20
  21 extern void versatile_secondary_startup(void);
  22
  23 /*
  24  * Initialise the CPU possible map early - this describes the CPUs
  25  * which may be present or become present in the system.
  26  */
  27 void __init smp_init_cpus(void)
  28 {
  29         ct_desc->init_cpu_map();
  30 }
  31
  32 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
  33 {
  34         /*
  35          * Initialise the present map, which describes the set of CPUs
  36          * actually populated at the present time.
  37          */
  38         ct_desc->smp_enable(max_cpus);
  39
  40         /*
  41          * Write the address of secondary startup into the
  42          * system-wide flags register. The boot monitor waits
  43          * until it receives a soft interrupt, and then the
  44          * secondary CPU branches to this address.
  45          */
  46         writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
  47         writel(virt_to_phys(versatile_secondary_startup),
  48                 MMIO_P2V(V2M_SYS_FLAGSSET));
  49 }