[deliverable/linux.git] / arch / microblaze / kernel / process.c

/*
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/pm.h>
#include <linux/tick.h>
#include <linux/bitops.h>
#include <asm/system.h>
#include <asm/pgalloc.h>

void show_regs(struct pt_regs *regs)
{
	printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->pt_mode);
	printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
				regs->r1, regs->r2, regs->r3, regs->r4);
	printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
				regs->r5, regs->r6, regs->r7, regs->r8);
	printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
				regs->r9, regs->r10, regs->r11, regs->r12);
	printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
				regs->r13, regs->r14, regs->r15, regs->r16);
	printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
				regs->r17, regs->r18, regs->r19, regs->r20);
	printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
				regs->r21, regs->r22, regs->r23, regs->r24);
	printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
				regs->r25, regs->r26, regs->r27, regs->r28);
	printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
				regs->r29, regs->r30, regs->r31, regs->pc);
	printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
				regs->msr, regs->ear, regs->esr, regs->fsr);
}

void (*pm_idle)(void);
void (*pm_power_off)(void) = NULL;
EXPORT_SYMBOL(pm_power_off);

static int hlt_counter = 1;

void disable_hlt(void)
{
	hlt_counter++;
}
EXPORT_SYMBOL(disable_hlt);

void enable_hlt(void)
{
	hlt_counter--;
}
EXPORT_SYMBOL(enable_hlt);

static int __init nohlt_setup(char *__unused)
{
	hlt_counter = 1;
	return 1;
}
__setup("nohlt", nohlt_setup);

static int __init hlt_setup(char *__unused)
{
	hlt_counter = 0;
	return 1;
}
__setup("hlt", hlt_setup);

void default_idle(void)
{
	if (!hlt_counter) {
		clear_thread_flag(TIF_POLLING_NRFLAG);
		smp_mb__after_clear_bit();
		local_irq_disable();
		while (!need_resched())
			cpu_sleep();
		local_irq_enable();
		set_thread_flag(TIF_POLLING_NRFLAG);
	} else
		while (!need_resched())
			cpu_relax();
}

void cpu_idle(void)
{
	set_thread_flag(TIF_POLLING_NRFLAG);

	/* endless idle loop with no priority at all */
	while (1) {
		void (*idle)(void) = pm_idle;

		if (!idle)
			idle = default_idle;

		tick_nohz_stop_sched_tick(1);
		while (!need_resched())
			idle();
		tick_nohz_restart_sched_tick();

		preempt_enable_no_resched();
		schedule();
		preempt_disable();
		check_pgt_cache();
	}
}

void flush_thread(void)
{
}

int copy_thread(unsigned long clone_flags, unsigned long usp,
		unsigned long unused,
		struct task_struct *p, struct pt_regs *regs)
{
	struct pt_regs *childregs = task_pt_regs(p);
	struct thread_info *ti = task_thread_info(p);

	*childregs = *regs;
	if (user_mode(regs))
		childregs->r1 = usp;
	else
		childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;

	memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
	ti->cpu_context.r1 = (unsigned long)childregs;
	ti->cpu_context.msr = (unsigned long)childregs->msr;
	ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;

	if (clone_flags & CLONE_SETTLS)
		;

	return 0;
}

/*
 * Return saved PC of a blocked thread.
 */
unsigned long thread_saved_pc(struct task_struct *tsk)
{
	struct cpu_context *ctx =
		&(((struct thread_info *)(tsk->stack))->cpu_context);

	/* Check whether the thread is blocked in resume() */
	if (in_sched_functions(ctx->r15))
		return (unsigned long)ctx->r15;
	else
		return ctx->r14;
}

static void kernel_thread_helper(int (*fn)(void *), void *arg)
{
	fn(arg);
	do_exit(-1);
}

int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
	struct pt_regs regs;
	int ret;

	memset(&regs, 0, sizeof(regs));
	/* store them in non-volatile registers */
	regs.r5 = (unsigned long)fn;
	regs.r6 = (unsigned long)arg;
	local_save_flags(regs.msr);
	regs.pc = (unsigned long)kernel_thread_helper;
	regs.pt_mode = 1;

	ret = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
			&regs, 0, NULL, NULL);

	return ret;
}

unsigned long get_wchan(struct task_struct *p)
{
/* TBD (used by procfs) */
	return 0;
}

/* Set up a thread for executing a new program */
void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
{
	set_fs(USER_DS);
	regs->pc = pc;
	regs->r1 = usp;
	regs->pt_mode = 0;
}
Commit	Line	Data
6496a23a MS	1	/*
	2	* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
	3	* Copyright (C) 2008-2009 PetaLogix
	4	* Copyright (C) 2006 Atmark Techno, Inc.
	5	*
	6	* This file is subject to the terms and conditions of the GNU General Public
	7	* License. See the file "COPYING" in the main directory of this archive
	8	* for more details.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/sched.h>
	13	#include <linux/pm.h>
	14	#include <linux/tick.h>
	15	#include <linux/bitops.h>
	16	#include <asm/system.h>
	17	#include <asm/pgalloc.h>
	18
	19	void show_regs(struct pt_regs *regs)
	20	{
ac3efab5	21	printk(KERN_INFO " Registers dump: mode=%X\r\n", regs->pt_mode);
6496a23a MS	22	printk(KERN_INFO " r1=%08lX, r2=%08lX, r3=%08lX, r4=%08lX\n",
	23	regs->r1, regs->r2, regs->r3, regs->r4);
	24	printk(KERN_INFO " r5=%08lX, r6=%08lX, r7=%08lX, r8=%08lX\n",
	25	regs->r5, regs->r6, regs->r7, regs->r8);
	26	printk(KERN_INFO " r9=%08lX, r10=%08lX, r11=%08lX, r12=%08lX\n",
	27	regs->r9, regs->r10, regs->r11, regs->r12);
	28	printk(KERN_INFO " r13=%08lX, r14=%08lX, r15=%08lX, r16=%08lX\n",
	29	regs->r13, regs->r14, regs->r15, regs->r16);
	30	printk(KERN_INFO " r17=%08lX, r18=%08lX, r19=%08lX, r20=%08lX\n",
	31	regs->r17, regs->r18, regs->r19, regs->r20);
	32	printk(KERN_INFO " r21=%08lX, r22=%08lX, r23=%08lX, r24=%08lX\n",
	33	regs->r21, regs->r22, regs->r23, regs->r24);
	34	printk(KERN_INFO " r25=%08lX, r26=%08lX, r27=%08lX, r28=%08lX\n",
	35	regs->r25, regs->r26, regs->r27, regs->r28);
	36	printk(KERN_INFO " r29=%08lX, r30=%08lX, r31=%08lX, rPC=%08lX\n",
	37	regs->r29, regs->r30, regs->r31, regs->pc);
	38	printk(KERN_INFO " msr=%08lX, ear=%08lX, esr=%08lX, fsr=%08lX\n",
	39	regs->msr, regs->ear, regs->esr, regs->fsr);
6496a23a MS	40	}
	41
	42	void (*pm_idle)(void);
	43	void (*pm_power_off)(void) = NULL;
	44	EXPORT_SYMBOL(pm_power_off);
	45
	46	static int hlt_counter = 1;
	47
	48	void disable_hlt(void)
	49	{
	50	hlt_counter++;
	51	}
	52	EXPORT_SYMBOL(disable_hlt);
	53
	54	void enable_hlt(void)
	55	{
	56	hlt_counter--;
	57	}
	58	EXPORT_SYMBOL(enable_hlt);
	59
	60	static int __init nohlt_setup(char *__unused)
	61	{
	62	hlt_counter = 1;
	63	return 1;
	64	}
	65	__setup("nohlt", nohlt_setup);
	66
	67	static int __init hlt_setup(char *__unused)
	68	{
	69	hlt_counter = 0;
	70	return 1;
	71	}
	72	__setup("hlt", hlt_setup);
	73
	74	void default_idle(void)
	75	{
	76	if (!hlt_counter) {
	77	clear_thread_flag(TIF_POLLING_NRFLAG);
	78	smp_mb__after_clear_bit();
	79	local_irq_disable();
	80	while (!need_resched())
	81	cpu_sleep();
	82	local_irq_enable();
	83	set_thread_flag(TIF_POLLING_NRFLAG);
	84	} else
	85	while (!need_resched())
	86	cpu_relax();
	87	}
	88
	89	void cpu_idle(void)
	90	{
	91	set_thread_flag(TIF_POLLING_NRFLAG);
	92
	93	/* endless idle loop with no priority at all */
	94	while (1) {
	95	void (*idle)(void) = pm_idle;
	96
	97	if (!idle)
	98	idle = default_idle;
	99
	100	tick_nohz_stop_sched_tick(1);
	101	while (!need_resched())
	102	idle();
	103	tick_nohz_restart_sched_tick();
104
105	preempt_enable_no_resched();
106	schedule();
107	preempt_disable();
108	check_pgt_cache();
109	}
110	}
111
112	void flush_thread(void)
113	{
114	}
115
a8fb748e	116	int copy_thread(unsigned long clone_flags, unsigned long usp,
6496a23a MS	117	unsigned long unused,
	118	struct task_struct p, struct pt_regs regs)
	119	{
	120	struct pt_regs *childregs = task_pt_regs(p);
	121	struct thread_info *ti = task_thread_info(p);
	122
	123	childregs = regs;
	124	if (user_mode(regs))
	125	childregs->r1 = usp;
	126	else
	127	childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
	128
	129	memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
	130	ti->cpu_context.r1 = (unsigned long)childregs;
	131	ti->cpu_context.msr = (unsigned long)childregs->msr;
	132	ti->cpu_context.r15 = (unsigned long)ret_from_fork - 8;
	133
	134	if (clone_flags & CLONE_SETTLS)
	135	;
	136
	137	return 0;
	138	}
	139
	140	/*
	141	* Return saved PC of a blocked thread.
	142	*/
	143	unsigned long thread_saved_pc(struct task_struct *tsk)
	144	{
	145	struct cpu_context *ctx =
	146	&(((struct thread_info *)(tsk->stack))->cpu_context);
	147
	148	/* Check whether the thread is blocked in resume() */
	149	if (in_sched_functions(ctx->r15))
	150	return (unsigned long)ctx->r15;
	151	else
	152	return ctx->r14;
	153	}
	154
	155	static void kernel_thread_helper(int (fn)(void ), void *arg)
	156	{
	157	fn(arg);
	158	do_exit(-1);
	159	}
	160
	161	int kernel_thread(int (fn)(void ), void *arg, unsigned long flags)
	162	{
	163	struct pt_regs regs;
	164	int ret;
	165
	166	memset(&regs, 0, sizeof(regs));
	167	/* store them in non-volatile registers */
	168	regs.r5 = (unsigned long)fn;
	169	regs.r6 = (unsigned long)arg;
	170	local_save_flags(regs.msr);
	171	regs.pc = (unsigned long)kernel_thread_helper;
ac3efab5	172	regs.pt_mode = 1;
6496a23a MS	173
	174	ret = do_fork(flags \| CLONE_VM \| CLONE_UNTRACED, 0,
	175	&regs, 0, NULL, NULL);
	176
	177	return ret;
	178	}
	179
	180	unsigned long get_wchan(struct task_struct *p)
	181	{
	182	/* TBD (used by procfs) */
	183	return 0;
	184	}
e1c4bd08 MS	185
	186	/* Set up a thread for executing a new program */
	187	void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
	188	{
	189	set_fs(USER_DS);
	190	regs->pc = pc;
	191	regs->r1 = usp;
	192	regs->pt_mode = 0;
	193	}