cpu.c

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/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2009 Wind River Systems,
 *   written by Ralf Baechle <[email protected]>
 */
#include <linux/init.h>
#include <linux/irqflags.h>
#include <linux/notifier.h>
#include <linux/prefetch.h>
#include <linux/sched.h>

#include <asm/cop2.h>
#include <asm/current.h>
#include <asm/mipsregs.h>
#include <asm/page.h>
#include <asm/octeon/octeon.h>

static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
    void *data)
{
    unsigned long flags;
    unsigned int status;

    switch (action) {
    case CU2_EXCEPTION:
        prefetch(&current->thread.cp2);
        local_irq_save(flags);
        KSTK_STATUS(current) |= ST0_CU2;
        status = read_c0_status();
        write_c0_status(status | ST0_CU2);
        octeon_cop2_restore(&(current->thread.cp2));
        write_c0_status(status & ~ST0_CU2);
        local_irq_restore(flags);

        return NOTIFY_BAD;  /* Don't call default notifier */
    }

    return NOTIFY_OK;       /* Let default notifier send signals */
}

static int __init cnmips_cu2_setup(void)
{
    return cu2_notifier(cnmips_cu2_call, 0);
}
early_initcall(cnmips_cu2_setup);