/* * 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 <ralf@linux-mips.org> */ #include <linux/init.h> #include <linux/irqflags.h> #include <linux/notifier.h> #include <linux/prefetch.h> #include <linux/ptrace.h> #include <linux/sched.h> #include <linux/sched/task_stack.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(¤t->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);