[net-next-2.6.git] / arch / m32r / kernel / process.c

/*
 *  linux/arch/m32r/kernel/process.c
 *
 *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
 *                            Hitoshi Yamamoto
 *  Taken from sh version.
 *    Copyright (C) 1995  Linus Torvalds
 *    SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
 */

#undef DEBUG_PROCESS
#ifdef DEBUG_PROCESS
#define DPRINTK(fmt, args...)  printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
  __func__, ##args)
#else
#define DPRINTK(fmt, args...)
#endif

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

#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/hardirq.h>

#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/elf.h>
#include <asm/m32r.h>

#include <linux/err.h>

/*
 * Return saved PC of a blocked thread.
 */
unsigned long thread_saved_pc(struct task_struct *tsk)
{
	return tsk->thread.lr;
}

/*
 * Powermanagement idle function, if any..
 */
static void (*pm_idle)(void) = NULL;

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

/*
 * We use this is we don't have any better
 * idle routine..
 */
static void default_idle(void)
{
	/* M32R_FIXME: Please use "cpu_sleep" mode.  */
	cpu_relax();
}

/*
 * On SMP it's slightly faster (but much more power-consuming!)
 * to poll the ->work.need_resched flag instead of waiting for the
 * cross-CPU IPI to arrive. Use this option with caution.
 */
static void poll_idle (void)
{
	/* M32R_FIXME */
	cpu_relax();
}

/*
 * The idle thread. There's no useful work to be
 * done, so just try to conserve power and have a
 * low exit latency (ie sit in a loop waiting for
 * somebody to say that they'd like to reschedule)
 */
void cpu_idle (void)
{
	/* endless idle loop with no priority at all */
	while (1) {
		while (!need_resched()) {
			void (*idle)(void) = pm_idle;

			if (!idle)
				idle = default_idle;

			idle();
		}
		preempt_enable_no_resched();
		schedule();
		preempt_disable();
	}
}

void machine_restart(char *__unused)
{
#if defined(CONFIG_PLAT_MAPPI3)
	outw(1, (unsigned long)PLD_REBOOT);
#endif

	printk("Please push reset button!\n");
	while (1)
		cpu_relax();
}

void machine_halt(void)
{
	printk("Please push reset button!\n");
	while (1)
		cpu_relax();
}

void machine_power_off(void)
{
	/* M32R_FIXME */
}

static int __init idle_setup (char *str)
{
	if (!strncmp(str, "poll", 4)) {
		printk("using poll in idle threads.\n");
		pm_idle = poll_idle;
	} else if (!strncmp(str, "sleep", 4)) {
		printk("using sleep in idle threads.\n");
		pm_idle = default_idle;
	}

	return 1;
}

__setup("idle=", idle_setup);

void show_regs(struct pt_regs * regs)
{
	printk("\n");
	printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
	  regs->bpc, regs->psw, regs->lr, regs->fp);
	printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
	  regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
	printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
	  regs->r0, regs->r1, regs->r2, regs->r3);
	printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
	  regs->r4, regs->r5, regs->r6, regs->r7);
	printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
	  regs->r8, regs->r9, regs->r10, regs->r11);
	printk("R12[%08lx]\n", \
	  regs->r12);

#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
	printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
	  regs->acc0h, regs->acc0l);
	printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
	  regs->acc1h, regs->acc1l);
#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
	printk("ACCH[%08lx]:ACCL[%08lx]\n", \
	  regs->acc0h, regs->acc0l);
#else
#error unknown isa configuration
#endif
}

/*
 * Create a kernel thread
 */

/*
 * This is the mechanism for creating a new kernel thread.
 *
 * NOTE! Only a kernel-only process(ie the swapper or direct descendants
 * who haven't done an "execve()") should use this: it will work within
 * a system call from a "real" process, but the process memory space will
 * not be free'd until both the parent and the child have exited.
 */
static void kernel_thread_helper(void *nouse, 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;

	memset(&regs, 0, sizeof (regs));
	regs.r1 = (unsigned long)fn;
	regs.r2 = (unsigned long)arg;

	regs.bpc = (unsigned long)kernel_thread_helper;

	regs.psw = M32R_PSW_BIE;

	/* Ok, create the new process. */
	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
		NULL);
}

/*
 * Free current thread data structures etc..
 */
void exit_thread(void)
{
	/* Nothing to do. */
	DPRINTK("pid = %d\n", current->pid);
}

void flush_thread(void)
{
	DPRINTK("pid = %d\n", current->pid);
	memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
}

void release_thread(struct task_struct *dead_task)
{
	/* do nothing */
	DPRINTK("pid = %d\n", dead_task->pid);
}

/* Fill in the fpu structure for a core dump.. */
int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
{
	return 0; /* Task didn't use the fpu at all. */
}

int copy_thread(unsigned long clone_flags, unsigned long spu,
	unsigned long unused, struct task_struct *tsk, struct pt_regs *regs)
{
	struct pt_regs *childregs = task_pt_regs(tsk);
	extern void ret_from_fork(void);

	/* Copy registers */
	*childregs = *regs;

	childregs->spu = spu;
	childregs->r0 = 0;	/* Child gets zero as return value */
	regs->r0 = tsk->pid;
	tsk->thread.sp = (unsigned long)childregs;
	tsk->thread.lr = (unsigned long)ret_from_fork;

	return 0;
}

asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
	unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
	struct pt_regs regs)
{
#ifdef CONFIG_MMU
	return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
#else
	return -EINVAL;
#endif /* CONFIG_MMU */
}

asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
			 unsigned long parent_tidptr,
			 unsigned long child_tidptr,
			 unsigned long r4, unsigned long r5, unsigned long r6,
			 struct pt_regs regs)
{
	if (!newsp)
		newsp = regs.spu;

	return do_fork(clone_flags, newsp, &regs, 0,
		       (int __user *)parent_tidptr, (int __user *)child_tidptr);
}

/*
 * This is trivial, and on the face of it looks like it
 * could equally well be done in user mode.
 *
 * Not so, for quite unobvious reasons - register pressure.
 * In user mode vfork() cannot have a stack frame, and if
 * done by calling the "clone()" system call directly, you
 * do not have enough call-clobbered registers to hold all
 * the information you need.
 */
asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
	unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
	struct pt_regs regs)
{
	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs.spu, &regs, 0,
			NULL, NULL);
}

/*
 * sys_execve() executes a new program.
 */
asmlinkage int sys_execve(const char __user *ufilename,
			  const char __user *const __user *uargv,
			  const char __user *const __user *uenvp,
			  unsigned long r3, unsigned long r4, unsigned long r5,
			  unsigned long r6, struct pt_regs regs)
{
	int error;
	char *filename;

	filename = getname(ufilename);
	error = PTR_ERR(filename);
	if (IS_ERR(filename))
		goto out;

	error = do_execve(filename, uargv, uenvp, &regs);
	putname(filename);
out:
	return error;
}

/*
 * These bracket the sleeping functions..
 */
#define first_sched	((unsigned long) scheduling_functions_start_here)
#define last_sched	((unsigned long) scheduling_functions_end_here)

unsigned long get_wchan(struct task_struct *p)
{
	/* M32R_FIXME */
	return (0);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m32r/kernel/process.c
	3	*
	4	* Copyright (c) 2001, 2002 Hiroyuki Kondo, Hirokazu Takata,
	5	* Hitoshi Yamamoto
	6	* Taken from sh version.
	7	* Copyright (C) 1995 Linus Torvalds
	8	* SuperH version: Copyright (C) 1999, 2000 Niibe Yutaka & Kaz Kojima
	9	*/
	10
	11	#undef DEBUG_PROCESS
	12	#ifdef DEBUG_PROCESS
	13	#define DPRINTK(fmt, args...) printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
80a914dc	14	__func__, ##args)
1da177e4 LT	15	#else
	16	#define DPRINTK(fmt, args...)
	17	#endif
	18
	19	/*
	20	* This file handles the architecture-dependent parts of process handling..
	21	*/
	22
	23	#include <linux/fs.h>
5a0e3ad6	24	#include <linux/slab.h>
1da177e4 LT	25	#include <linux/module.h>
	26	#include <linux/ptrace.h>
	27	#include <linux/unistd.h>
1da177e4 LT	28	#include <linux/hardirq.h>
	29
	30	#include <asm/io.h>
	31	#include <asm/uaccess.h>
	32	#include <asm/mmu_context.h>
	33	#include <asm/elf.h>
	34	#include <asm/m32r.h>
	35
	36	#include <linux/err.h>
	37
1da177e4 LT	38	/*
	39	* Return saved PC of a blocked thread.
	40	*/
	41	unsigned long thread_saved_pc(struct task_struct *tsk)
	42	{
	43	return tsk->thread.lr;
	44	}
	45
	46	/*
	47	* Powermanagement idle function, if any..
	48	*/
81e48073	49	static void (*pm_idle)(void) = NULL;
5e38291d EB	50
	51	void (*pm_power_off)(void) = NULL;
	52	EXPORT_SYMBOL(pm_power_off);
1da177e4	53
1da177e4 LT	54	/*
	55	* We use this is we don't have any better
	56	* idle routine..
	57	*/
81e48073	58	static void default_idle(void)
1da177e4 LT	59	{
	60	/* M32R_FIXME: Please use "cpu_sleep" mode. */
	61	cpu_relax();
	62	}
	63
	64	/*
	65	* On SMP it's slightly faster (but much more power-consuming!)
	66	* to poll the ->work.need_resched flag instead of waiting for the
	67	* cross-CPU IPI to arrive. Use this option with caution.
	68	*/
	69	static void poll_idle (void)
	70	{
	71	/* M32R_FIXME */
	72	cpu_relax();
	73	}
	74
	75	/*
	76	* The idle thread. There's no useful work to be
	77	* done, so just try to conserve power and have a
	78	* low exit latency (ie sit in a loop waiting for
	79	* somebody to say that they'd like to reschedule)
	80	*/
	81	void cpu_idle (void)
	82	{
	83	/* endless idle loop with no priority at all */
	84	while (1) {
	85	while (!need_resched()) {
	86	void (*idle)(void) = pm_idle;
	87
	88	if (!idle)
	89	idle = default_idle;
	90
	91	idle();
	92	}
5bfb5d69	93	preempt_enable_no_resched();
1da177e4	94	schedule();
5bfb5d69	95	preempt_disable();
1da177e4 LT	96	}
	97	}
	98
	99	void machine_restart(char *__unused)
	100	{
0d34c86c HT	101	#if defined(CONFIG_PLAT_MAPPI3)
	102	outw(1, (unsigned long)PLD_REBOOT);
	103	#endif
	104
1da177e4 LT	105	printk("Please push reset button!\n");
	106	while (1)
	107	cpu_relax();
	108	}
	109
1da177e4 LT	110	void machine_halt(void)
	111	{
	112	printk("Please push reset button!\n");
	113	while (1)
	114	cpu_relax();
	115	}
	116
1da177e4 LT	117	void machine_power_off(void)
	118	{
	119	/* M32R_FIXME */
	120	}
	121
1da177e4 LT	122	static int __init idle_setup (char *str)
	123	{
	124	if (!strncmp(str, "poll", 4)) {
	125	printk("using poll in idle threads.\n");
	126	pm_idle = poll_idle;
	127	} else if (!strncmp(str, "sleep", 4)) {
	128	printk("using sleep in idle threads.\n");
	129	pm_idle = default_idle;
	130	}
	131
	132	return 1;
	133	}
	134
	135	__setup("idle=", idle_setup);
	136
	137	void show_regs(struct pt_regs * regs)
	138	{
	139	printk("\n");
	140	printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
	141	regs->bpc, regs->psw, regs->lr, regs->fp);
	142	printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
	143	regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
	144	printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
	145	regs->r0, regs->r1, regs->r2, regs->r3);
	146	printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
	147	regs->r4, regs->r5, regs->r6, regs->r7);
	148	printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
	149	regs->r8, regs->r9, regs->r10, regs->r11);
	150	printk("R12[%08lx]\n", \
	151	regs->r12);
	152
	153	#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
	154	printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
	155	regs->acc0h, regs->acc0l);
	156	printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
	157	regs->acc1h, regs->acc1l);
	158	#elif defined(CONFIG_ISA_M32R2) \|\| defined(CONFIG_ISA_M32R)
	159	printk("ACCH[%08lx]:ACCL[%08lx]\n", \
9674dcf7	160	regs->acc0h, regs->acc0l);
1da177e4 LT	161	#else
	162	#error unknown isa configuration
	163	#endif
	164	}
	165
	166	/*
	167	* Create a kernel thread
	168	*/
	169
	170	/*
	171	* This is the mechanism for creating a new kernel thread.
	172	*
	173	* NOTE! Only a kernel-only process(ie the swapper or direct descendants
	174	* who haven't done an "execve()") should use this: it will work within
	175	* a system call from a "real" process, but the process memory space will
	176	* not be free'd until both the parent and the child have exited.
	177	*/
	178	static void kernel_thread_helper(void nouse, int (fn)(void ), void arg)
	179	{
	180	fn(arg);
	181	do_exit(-1);
	182	}
	183
	184	int kernel_thread(int (fn)(void ), void *arg, unsigned long flags)
	185	{
	186	struct pt_regs regs;
	187
	188	memset(&regs, 0, sizeof (regs));
	189	regs.r1 = (unsigned long)fn;
	190	regs.r2 = (unsigned long)arg;
	191
	192	regs.bpc = (unsigned long)kernel_thread_helper;
	193
	194	regs.psw = M32R_PSW_BIE;
	195
	196	/* Ok, create the new process. */
	197	return do_fork(flags \| CLONE_VM \| CLONE_UNTRACED, 0, &regs, 0, NULL,
	198	NULL);
	199	}
	200
	201	/*
	202	* Free current thread data structures etc..
	203	*/
	204	void exit_thread(void)
	205	{
	206	/* Nothing to do. */
	207	DPRINTK("pid = %d\n", current->pid);
	208	}
	209
	210	void flush_thread(void)
	211	{
	212	DPRINTK("pid = %d\n", current->pid);
	213	memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
	214	}
	215
	216	void release_thread(struct task_struct *dead_task)
	217	{
	218	/* do nothing */
	219	DPRINTK("pid = %d\n", dead_task->pid);
	220	}
	221
	222	/* Fill in the fpu structure for a core dump.. */
	223	int dump_fpu(struct pt_regs regs, elf_fpregset_t fpu)
	224	{
225	return 0; /* Task didn't use the fpu at all. */
226	}
227
6f2c55b8	228	int copy_thread(unsigned long clone_flags, unsigned long spu,
1da177e4 LT	229	unsigned long unused, struct task_struct tsk, struct pt_regs regs)
1da177e4 LT	230	{
6c3559fc	231	struct pt_regs *childregs = task_pt_regs(tsk);
1da177e4 LT	232	extern void ret_from_fork(void);
	233
	234	/* Copy registers */
1da177e4 LT	235	childregs = regs;
	236
	237	childregs->spu = spu;
	238	childregs->r0 = 0; /* Child gets zero as return value */
	239	regs->r0 = tsk->pid;
	240	tsk->thread.sp = (unsigned long)childregs;
	241	tsk->thread.lr = (unsigned long)ret_from_fork;
	242
	243	return 0;
	244	}
	245
1da177e4 LT	246	asmlinkage int sys_fork(unsigned long r0, unsigned long r1, unsigned long r2,
	247	unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
	248	struct pt_regs regs)
	249	{
	250	#ifdef CONFIG_MMU
	251	return do_fork(SIGCHLD, regs.spu, &regs, 0, NULL, NULL);
	252	#else
	253	return -EINVAL;
	254	#endif /* CONFIG_MMU */
	255	}
	256
	257	asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
	258	unsigned long parent_tidptr,
	259	unsigned long child_tidptr,
	260	unsigned long r4, unsigned long r5, unsigned long r6,
	261	struct pt_regs regs)
	262	{
	263	if (!newsp)
	264	newsp = regs.spu;
	265
	266	return do_fork(clone_flags, newsp, &regs, 0,
	267	(int __user )parent_tidptr, (int __user )child_tidptr);
	268	}
	269
	270	/*
	271	* This is trivial, and on the face of it looks like it
	272	* could equally well be done in user mode.
	273	*
	274	* Not so, for quite unobvious reasons - register pressure.
	275	* In user mode vfork() cannot have a stack frame, and if
	276	* done by calling the "clone()" system call directly, you
	277	* do not have enough call-clobbered registers to hold all
	278	* the information you need.
	279	*/
	280	asmlinkage int sys_vfork(unsigned long r0, unsigned long r1, unsigned long r2,
	281	unsigned long r3, unsigned long r4, unsigned long r5, unsigned long r6,
	282	struct pt_regs regs)
	283	{
	284	return do_fork(CLONE_VFORK \| CLONE_VM \| SIGCHLD, regs.spu, &regs, 0,
	285	NULL, NULL);
	286	}
	287
	288	/*
	289	* sys_execve() executes a new program.
	290	*/
c7887325	291	asmlinkage int sys_execve(const char __user *ufilename,
d7627467 DH	292	const char __user const __user uargv,
d7627467 DH	293	const char __user const __user uenvp,
1da177e4 LT	294	unsigned long r3, unsigned long r4, unsigned long r5,
	295	unsigned long r6, struct pt_regs regs)
	296	{
	297	int error;
	298	char *filename;
	299
	300	filename = getname(ufilename);
	301	error = PTR_ERR(filename);
	302	if (IS_ERR(filename))
	303	goto out;
	304
	305	error = do_execve(filename, uargv, uenvp, &regs);
1da177e4 LT	306	putname(filename);
	307	out:
	308	return error;
	309	}
	310
	311	/*
	312	* These bracket the sleeping functions..
	313	*/
	314	#define first_sched ((unsigned long) scheduling_functions_start_here)
	315	#define last_sched ((unsigned long) scheduling_functions_end_here)
	316
	317	unsigned long get_wchan(struct task_struct *p)
	318	{
	319	/* M32R_FIXME */
	320	return (0);
	321	}