[deliverable/linux.git] / arch / h8300 / kernel / process.c

/*
 *  linux/arch/h8300/kernel/process.c
 *
 * Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 *  Based on:
 *
 *  linux/arch/m68knommu/kernel/process.c
 *
 *  Copyright (C) 1998  D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
 *                      Kenneth Albanowski <kjahds@kjahds.com>,
 *                      The Silver Hammer Group, Ltd.
 *
 *  linux/arch/m68k/kernel/process.c
 *
 *  Copyright (C) 1995  Hamish Macdonald
 *
 *  68060 fixes by Jesper Skov
 */

/*
 * This file handles the architecture-dependent parts of process handling..
 */

#include <linux/errno.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/interrupt.h>
#include <linux/reboot.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>

#include <asm/uaccess.h>
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/pgtable.h>

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

asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);

/*
 * The idle loop on an H8/300..
 */
#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
void arch_cpu_idle(void)
{
	local_irq_enable();
	/* XXX: race here! What if need_resched() gets set now? */
	__asm__("sleep");
}
#endif

void machine_restart(char * __unused)
{
	local_irq_disable();
	__asm__("jmp @@0"); 
}

void machine_halt(void)
{
	local_irq_disable();
	__asm__("sleep");
	for (;;);
}

void machine_power_off(void)
{
	local_irq_disable();
	__asm__("sleep");
	for (;;);
}

void show_regs(struct pt_regs * regs)
{
	show_regs_print_info(KERN_DEFAULT);

	printk("\nPC: %08lx  Status: %02x",
	       regs->pc, regs->ccr);
	printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
	       regs->orig_er0, regs->er0, regs->er1);
	printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
	       regs->er2, regs->er3, regs->er4, regs->er5);
	printk("\nER6' %08lx ",regs->er6);
	if (user_mode(regs))
		printk("USP: %08lx\n", rdusp());
	else
		printk("\n");
}

void flush_thread(void)
{
}

int copy_thread(unsigned long clone_flags,
                unsigned long usp, unsigned long topstk,
		 struct task_struct * p)
{
	struct pt_regs * childregs;

	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;

	if (unlikely(p->flags & PF_KTHREAD)) {
		memset(childregs, 0, sizeof(struct pt_regs));
		childregs->retpc = (unsigned long) ret_from_kernel_thread;
		childregs->er4 = topstk; /* arg */
		childregs->er5 = usp; /* fn */
		p->thread.ksp = (unsigned long)childregs;
	}
	*childregs = *current_pt_regs();
	childregs->retpc = (unsigned long) ret_from_fork;
	childregs->er0 = 0;
	p->thread.usp = usp ?: rdusp();
	p->thread.ksp = (unsigned long)childregs;

	return 0;
}

unsigned long thread_saved_pc(struct task_struct *tsk)
{
	return ((struct pt_regs *)tsk->thread.esp0)->pc;
}

unsigned long get_wchan(struct task_struct *p)
{
	unsigned long fp, pc;
	unsigned long stack_page;
	int count = 0;
	if (!p || p == current || p->state == TASK_RUNNING)
		return 0;

	stack_page = (unsigned long)p;
	fp = ((struct pt_regs *)p->thread.ksp)->er6;
	do {
		if (fp < stack_page+sizeof(struct thread_info) ||
		    fp >= 8184+stack_page)
			return 0;
		pc = ((unsigned long *)fp)[1];
		if (!in_sched_functions(pc))
			return pc;
		fp = *(unsigned long *) fp;
	} while (count++ < 16);
	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/h8300/kernel/process.c
	3	*
	4	* Yoshinori Sato <ysato@users.sourceforge.jp>
	5	*
	6	* Based on:
	7	*
	8	* linux/arch/m68knommu/kernel/process.c
	9	*
	10	* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
	11	* Kenneth Albanowski <kjahds@kjahds.com>,
	12	* The Silver Hammer Group, Ltd.
	13	*
	14	* linux/arch/m68k/kernel/process.c
	15	*
	16	* Copyright (C) 1995 Hamish Macdonald
	17	*
	18	* 68060 fixes by Jesper Skov
	19	*/
	20
	21	/*
	22	* This file handles the architecture-dependent parts of process handling..
	23	*/
	24
1da177e4 LT	25	#include <linux/errno.h>
	26	#include <linux/module.h>
	27	#include <linux/sched.h>
	28	#include <linux/kernel.h>
	29	#include <linux/mm.h>
	30	#include <linux/smp.h>
1da177e4 LT	31	#include <linux/stddef.h>
	32	#include <linux/unistd.h>
	33	#include <linux/ptrace.h>
1da177e4	34	#include <linux/user.h>
1da177e4 LT	35	#include <linux/interrupt.h>
1da177e4 LT	36	#include <linux/reboot.h>
0cd82ef1	37	#include <linux/fs.h>
5a0e3ad6	38	#include <linux/slab.h>
b2fe1430	39	#include <linux/rcupdate.h>
1da177e4 LT	40
1da177e4 LT	41	#include <asm/uaccess.h>
1da177e4 LT	42	#include <asm/traps.h>
	43	#include <asm/setup.h>
	44	#include <asm/pgtable.h>
	45
47f3fc94 AB	46	void (*pm_power_off)(void) = NULL;
	47	EXPORT_SYMBOL(pm_power_off);
	48
1da177e4	49	asmlinkage void ret_from_fork(void);
557e1995	50	asmlinkage void ret_from_kernel_thread(void);
1da177e4 LT	51
	52	/*
	53	* The idle loop on an H8/300..
	54	*/
	55	#if !defined(CONFIG_H8300H_SIM) && !defined(CONFIG_H8S_SIM)
0d24260c	56	void arch_cpu_idle(void)
1da177e4	57	{
0d24260c TG	58	local_irq_enable();
	59	/* XXX: race here! What if need_resched() gets set now? */
	60	__asm__("sleep");
1da177e4 LT	61	}
1da177e4 LT	62	#endif
1da177e4 LT	63
	64	void machine_restart(char * __unused)
	65	{
	66	local_irq_disable();
	67	__asm__("jmp @@0");
	68	}
	69
1da177e4 LT	70	void machine_halt(void)
	71	{
	72	local_irq_disable();
	73	__asm__("sleep");
	74	for (;;);
	75	}
	76
1da177e4 LT	77	void machine_power_off(void)
	78	{
	79	local_irq_disable();
	80	__asm__("sleep");
	81	for (;;);
	82	}
	83
1da177e4 LT	84	void show_regs(struct pt_regs * regs)
1da177e4 LT	85	{
a43cb95d TH	86	show_regs_print_info(KERN_DEFAULT);
a43cb95d TH	87
1da177e4 LT	88	printk("\nPC: %08lx Status: %02x",
	89	regs->pc, regs->ccr);
	90	printk("\nORIG_ER0: %08lx ER0: %08lx ER1: %08lx",
	91	regs->orig_er0, regs->er0, regs->er1);
	92	printk("\nER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx",
	93	regs->er2, regs->er3, regs->er4, regs->er5);
	94	printk("\nER6' %08lx ",regs->er6);
	95	if (user_mode(regs))
	96	printk("USP: %08lx\n", rdusp());
	97	else
	98	printk("\n");
	99	}
	100
1da177e4 LT	101	void flush_thread(void)
	102	{
	103	}
	104
6f2c55b8	105	int copy_thread(unsigned long clone_flags,
1da177e4	106	unsigned long usp, unsigned long topstk,
afa86fc4	107	struct task_struct * p)
1da177e4 LT	108	{
	109	struct pt_regs * childregs;
	110
68f8b1f8	111	childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
1da177e4	112
557e1995 AV	113	if (unlikely(p->flags & PF_KTHREAD)) {
	114	memset(childregs, 0, sizeof(struct pt_regs));
	115	childregs->retpc = (unsigned long) ret_from_kernel_thread;
	116	childregs->er4 = topstk; /* arg */
	117	childregs->er5 = usp; /* fn */
	118	p->thread.ksp = (unsigned long)childregs;
	119	}
3416e809	120	childregs = current_pt_regs();
1da177e4 LT	121	childregs->retpc = (unsigned long) ret_from_fork;
1da177e4 LT	122	childregs->er0 = 0;
3416e809	123	p->thread.usp = usp ?: rdusp();
1da177e4 LT	124	p->thread.ksp = (unsigned long)childregs;
	125
	126	return 0;
	127	}
	128
1da177e4 LT	129	unsigned long thread_saved_pc(struct task_struct *tsk)
	130	{
	131	return ((struct pt_regs *)tsk->thread.esp0)->pc;
	132	}
	133
	134	unsigned long get_wchan(struct task_struct *p)
	135	{
	136	unsigned long fp, pc;
	137	unsigned long stack_page;
	138	int count = 0;
	139	if (!p \|\| p == current \|\| p->state == TASK_RUNNING)
	140	return 0;
	141
	142	stack_page = (unsigned long)p;
	143	fp = ((struct pt_regs *)p->thread.ksp)->er6;
	144	do {
	145	if (fp < stack_page+sizeof(struct thread_info) \|\|
	146	fp >= 8184+stack_page)
	147	return 0;
	148	pc = ((unsigned long *)fp)[1];
	149	if (!in_sched_functions(pc))
	150	return pc;
	151	fp = (unsigned long ) fp;
	152	} while (count++ < 16);
	153	return 0;
	154	}