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 <asm/unified.h>
  17
  18 #include <mach/motherboard.h>
  19 #define V2M_PA_CS7 0x10000000
  20
  21 #include "core.h"
  22
  23 extern void versatile_secondary_startup(void);
  24
  25 /*
  26  * Initialise the CPU possible map early - this describes the CPUs
  27  * which may be present or become present in the system.
  28  */
  29 void __init smp_init_cpus(void)
  30 {
  31         ct_desc->init_cpu_map();
  32 }
  33
  34 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
  35 {
  36         /*
  37          * Initialise the present map, which describes the set of CPUs
  38          * actually populated at the present time.
  39          */
  40         ct_desc->smp_enable(max_cpus);
  41
  42         /*
  43          * Write the address of secondary startup into the
  44          * system-wide flags register. The boot monitor waits
  45          * until it receives a soft interrupt, and then the
  46          * secondary CPU branches to this address.
  47          */
  48         writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
  49         writel(BSYM(virt_to_phys(versatile_secondary_startup)),
  50                 MMIO_P2V(V2M_SYS_FLAGSSET));
  51 }