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 cnmips_cu2_call(struct notifier_block * nfb,unsigned long action,void * data)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(¤t->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 cnmips_cu2_setup(void)46static int __init cnmips_cu2_setup(void) 47 { 48 return cu2_notifier(cnmips_cu2_call, 0); 49 } 50 early_initcall(cnmips_cu2_setup); 51