mips/cavium-octeon/cpu.c

0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive
0004  * for more details.
0005  *
0006  * Copyright (C) 2009 Wind River Systems,
0007  *   written by Ralf Baechle <ralf@linux-mips.org>
0008  */
0009 #include <linux/init.h>
0010 #include <linux/irqflags.h>
0011 #include <linux/notifier.h>
0012 #include <linux/prefetch.h>
0013 #include <linux/ptrace.h>
0014 #include <linux/sched.h>
0015 #include <linux/sched/task_stack.h>
0016
0017 #include <asm/cop2.h>
0018 #include <asm/current.h>
0019 #include <asm/mipsregs.h>
0020 #include <asm/page.h>
0021 #include <asm/octeon/octeon.h>
0022
0023 static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
0024     void *data)
0025 {
0026     unsigned long flags;
0027     unsigned int status;
0028
0029     switch (action) {
0030     case CU2_EXCEPTION:
0031         prefetch(&current->thread.cp2);
0032         local_irq_save(flags);
0033         KSTK_STATUS(current) |= ST0_CU2;
0034         status = read_c0_status();
0035         write_c0_status(status | ST0_CU2);
0036         octeon_cop2_restore(&(current->thread.cp2));
0037         write_c0_status(status & ~ST0_CU2);
0038         local_irq_restore(flags);
0039
0040         return NOTIFY_BAD;  /* Don't call default notifier */
0041     }
0042
0043     return NOTIFY_OK;       /* Let default notifier send signals */
0044 }
0045
0046 static int __init cnmips_cu2_setup(void)
0047 {
0048     return cu2_notifier(cnmips_cu2_call, 0);
0049 }
0050 early_initcall(cnmips_cu2_setup);