sim_smp.c

LINUX 2.6.17.4的源码

/*
 * 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 SMP operation
 */
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpumask.h>
#include <linux/interrupt.h>
#include <asm/atomic.h>
#include <asm/cpu.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/hardirq.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
#ifdef CONFIG_MIPS_MT_SMTC
#include <asm/smtc_ipi.h>
#endif /* CONFIG_MIPS_MT_SMTC */

/* VPE/SMP Prototype implements platform interfaces directly */
#if !defined(CONFIG_MIPS_MT_SMP)

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

void core_send_ipi(int cpu, unsigned int action)
{
#ifdef CONFIG_MIPS_MT_SMTC
	smtc_send_ipi(cpu, LINUX_SMP_IPI, action);
#endif /* CONFIG_MIPS_MT_SMTC */
/* "CPU" may be TC of same VPE, VPE of same CPU, or different CPU */

}

/*
 * Detect available CPUs/VPEs/TCs and populate phys_cpu_present_map
 */

void __init prom_build_cpu_map(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	int nextslot;

	/*
	 * As of November, 2004, MIPSsim only simulates one core
	 * at a time.  However, that core may be a MIPS MT core
	 * with multiple virtual processors and thread contexts.
	 */

	if (read_c0_config3() & (1<<2)) {
		nextslot = mipsmt_build_cpu_map(1);
	}
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Platform "CPU" startup hook
 */

void prom_boot_secondary(int cpu, struct task_struct *idle)
{
#ifdef CONFIG_MIPS_MT_SMTC
	smtc_boot_secondary(cpu, idle);
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Post-config but pre-boot cleanup entry point
 */

void prom_init_secondary(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	void smtc_init_secondary(void);

	smtc_init_secondary();
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Platform SMP pre-initialization
 */

void prom_prepare_cpus(unsigned int max_cpus)
{
#ifdef CONFIG_MIPS_MT_SMTC
	/*
	 * 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(max_cpus);
	}
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * SMP initialization finalization entry point
 */

void prom_smp_finish(void)
{
#ifdef CONFIG_MIPS_MT_SMTC
	smtc_smp_finish();
#endif /* CONFIG_MIPS_MT_SMTC */
}

/*
 * Hook for after all CPUs are online
 */

void prom_cpus_done(void)
{
#ifdef CONFIG_MIPS_MT_SMTC

#endif /* CONFIG_MIPS_MT_SMTC */
}
#endif /* CONFIG_MIPS32R2_MT_SMP */