[net-next-2.6.git] / arch / mips / cavium-octeon / cpu.c

/*
 * 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/sched.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(&current->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);
Commit	Line	Data
69f3a7de RB	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/sched.h>
	14
	15	#include <asm/cop2.h>
	16	#include <asm/current.h>
	17	#include <asm/mipsregs.h>
	18	#include <asm/page.h>
	19	#include <asm/octeon/octeon.h>
	20
	21	static int cnmips_cu2_call(struct notifier_block *nfb, unsigned long action,
	22	void *data)
	23	{
	24	unsigned long flags;
	25	unsigned int status;
	26
	27	switch (action) {
	28	case CU2_EXCEPTION:
	29	prefetch(&current->thread.cp2);
	30	local_irq_save(flags);
	31	KSTK_STATUS(current) \|= ST0_CU2;
	32	status = read_c0_status();
	33	write_c0_status(status \| ST0_CU2);
	34	octeon_cop2_restore(&(current->thread.cp2));
	35	write_c0_status(status & ~ST0_CU2);
	36	local_irq_restore(flags);
	37
	38	return NOTIFY_BAD; /* Don't call default notifier */
	39	}
	40
	41	return NOTIFY_OK; /* Let default notifier send signals */
	42	}
	43
158d6742	44	static int __init cnmips_cu2_setup(void)
69f3a7de	45	{
4483b159	46	return cu2_notifier(cnmips_cu2_call, 0);
69f3a7de RB	47	}
69f3a7de RB	48	early_initcall(cnmips_cu2_setup);