LXR linux/arch/mips/cavium-octeon/cpu.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 2009 Wind River Systems,
   7 *   written by Ralf Baechle <ralf@linux-mips.org>
   8 */
   9#include <linux/init.h>
  10#include <linux/irqflags.h>
  11#include <linux/notifier.h>
  12#include <linux/prefetch.h>
  13#include <linux/ptrace.h>
  14#include <linux/sched.h>
  15#include <linux/sched/task_stack.h>
  16
  17#include <asm/cop2.h>
  18#include <asm/current.h>
  19#include <asm/mipsregs.h>
  20#include <asm/page.h>
  21#include <asm/octeon/octeon.h>
  22
  23static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
  24        void *data)
  25{
  26        unsigned long flags;
  27        unsigned int status;
  28
  29        switch (action) {
  30        case CU2_EXCEPTION:
  31                prefetch(&current->thread.cp2);
  32                local_irq_save(flags);
  33                KSTK_STATUS(current) |= ST0_CU2;
  34                status = read_c0_status();
  35                write_c0_status(status | ST0_CU2);
  36                octeon_cop2_restore(&(current->thread.cp2));
  37                write_c0_status(status & ~ST0_CU2);
  38                local_irq_restore(flags);
  39
  40                return NOTIFY_BAD;      /* Don't call default notifier */
  41        }
  42
  43        return NOTIFY_OK;               /* Let default notifier send signals */
  44}
  45
  46static int __init cnmips_cu2_setup(void)
  47{
  48        return cu2_notifier(cnmips_cu2_call, 0);
  49}
  50early_initcall(cnmips_cu2_setup);
  51