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Linux/arch/mips/cavium-octeon/cpu.c

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  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 
 23 static 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 
 46 static int __init cnmips_cu2_setup(void)
 47 {
 48         return cu2_notifier(cnmips_cu2_call, 0);
 49 }
 50 early_initcall(cnmips_cu2_setup);
 51 

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