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sim_smtc.c

/*
 * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 */
/*
 * Simulator Platform-specific hooks for SMTC operation
 */
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
#include <linux/smp.h>

#include <asm/atomic.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/smtc_ipi.h>

/* VPE/SMP Prototype implements platform interfaces directly */

/*
 * Cause the specified action to be performed on a targeted "CPU"
 */

static void ssmtc_send_ipi_single(int cpu, unsigned int action)
{
      smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
      /* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */
}

static inline void ssmtc_send_ipi_mask(cpumask_t mask, unsigned int action)
{
      unsigned int i;

      for_each_cpu_mask(i, mask)
            ssmtc_send_ipi_single(i, action);
}

/*
 * Post-config but pre-boot cleanup entry point
 */
static void __cpuinit ssmtc_init_secondary(void)
{
      void smtc_init_secondary(void);

      smtc_init_secondary();
}

/*
 * SMP initialization finalization entry point
 */
static void __cpuinit ssmtc_smp_finish(void)
{
      smtc_smp_finish();
}

/*
 * Hook for after all CPUs are online
 */
static void ssmtc_cpus_done(void)
{
}

/*
 * Platform "CPU" startup hook
 */
static void __cpuinit ssmtc_boot_secondary(int cpu, struct task_struct *idle)
{
      smtc_boot_secondary(cpu, idle);
}

static void __init ssmtc_smp_setup(void)
{
      if (read_c0_config3() & (1 << 2))
            mipsmt_build_cpu_map(0);
}

/*
 * Platform SMP pre-initialization
 */
static void ssmtc_prepare_cpus(unsigned int max_cpus)
{
      /*
       * As noted above, we can assume a single CPU for now
       * but it may be multithreaded.
       */

      if (read_c0_config3() & (1 << 2)) {
            mipsmt_prepare_cpus();
      }
}

struct plat_smp_ops ssmtc_smp_ops = {
      .send_ipi_single  = ssmtc_send_ipi_single,
      .send_ipi_mask          = ssmtc_send_ipi_mask,
      .init_secondary         = ssmtc_init_secondary,
      .smp_finish       = ssmtc_smp_finish,
      .cpus_done        = ssmtc_cpus_done,
      .boot_secondary         = ssmtc_boot_secondary,
      .smp_setup        = ssmtc_smp_setup,
      .prepare_cpus           = ssmtc_prepare_cpus,
};

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