[net-next-2.6.git] / arch / mips / kernel / kspd.c

/*
 * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/unistd.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/fs.h>
#include <linux/syscalls.h>
#include <linux/workqueue.h>
#include <linux/errno.h>
#include <linux/list.h>

#include <asm/vpe.h>
#include <asm/rtlx.h>
#include <asm/kspd.h>

static struct workqueue_struct *workqueue;
static struct work_struct work;

extern unsigned long cpu_khz;

struct mtsp_syscall {
	int cmd;
	unsigned char abi;
	unsigned char size;
};

struct mtsp_syscall_ret {
	int retval;
	int errno;
};

struct mtsp_syscall_generic {
	int arg0;
	int arg1;
	int arg2;
	int arg3;
	int arg4;
	int arg5;
	int arg6;
};

static struct list_head kspd_notifylist;
static int sp_stopping;

/* these should match with those in the SDE kit */
#define MTSP_SYSCALL_BASE	0
#define MTSP_SYSCALL_EXIT	(MTSP_SYSCALL_BASE + 0)
#define MTSP_SYSCALL_OPEN	(MTSP_SYSCALL_BASE + 1)
#define MTSP_SYSCALL_READ	(MTSP_SYSCALL_BASE + 2)
#define MTSP_SYSCALL_WRITE	(MTSP_SYSCALL_BASE + 3)
#define MTSP_SYSCALL_CLOSE	(MTSP_SYSCALL_BASE + 4)
#define MTSP_SYSCALL_LSEEK32	(MTSP_SYSCALL_BASE + 5)
#define MTSP_SYSCALL_ISATTY	(MTSP_SYSCALL_BASE + 6)
#define MTSP_SYSCALL_GETTIME	(MTSP_SYSCALL_BASE + 7)
#define MTSP_SYSCALL_PIPEFREQ	(MTSP_SYSCALL_BASE + 8)
#define MTSP_SYSCALL_GETTOD	(MTSP_SYSCALL_BASE + 9)
#define MTSP_SYSCALL_IOCTL     (MTSP_SYSCALL_BASE + 10)

#define MTSP_O_RDONLY		0x0000
#define MTSP_O_WRONLY		0x0001
#define MTSP_O_RDWR		0x0002
#define MTSP_O_NONBLOCK		0x0004
#define MTSP_O_APPEND		0x0008
#define MTSP_O_SHLOCK		0x0010
#define MTSP_O_EXLOCK		0x0020
#define MTSP_O_ASYNC		0x0040
#define MTSP_O_FSYNC		O_SYNC
#define MTSP_O_NOFOLLOW		0x0100
#define MTSP_O_SYNC		0x0080
#define MTSP_O_CREAT		0x0200
#define MTSP_O_TRUNC		0x0400
#define MTSP_O_EXCL		0x0800
#define MTSP_O_BINARY		0x8000

extern int tclimit;

struct apsp_table  {
	int sp;
	int ap;
};

/* we might want to do the mode flags too */
struct apsp_table open_flags_table[] = {
	{ MTSP_O_RDWR, O_RDWR },
	{ MTSP_O_WRONLY, O_WRONLY },
	{ MTSP_O_CREAT, O_CREAT },
	{ MTSP_O_TRUNC, O_TRUNC },
	{ MTSP_O_NONBLOCK, O_NONBLOCK },
	{ MTSP_O_APPEND, O_APPEND },
	{ MTSP_O_NOFOLLOW, O_NOFOLLOW }
};

struct apsp_table syscall_command_table[] = {
	{ MTSP_SYSCALL_OPEN, __NR_open },
	{ MTSP_SYSCALL_CLOSE, __NR_close },
	{ MTSP_SYSCALL_READ, __NR_read },
	{ MTSP_SYSCALL_WRITE, __NR_write },
	{ MTSP_SYSCALL_LSEEK32, __NR_lseek },
	{ MTSP_SYSCALL_IOCTL, __NR_ioctl }
};

static int sp_syscall(int num, int arg0, int arg1, int arg2, int arg3)
{
	register long int _num  __asm__("$2") = num;
	register long int _arg0  __asm__("$4") = arg0;
	register long int _arg1  __asm__("$5") = arg1;
	register long int _arg2  __asm__("$6") = arg2;
	register long int _arg3  __asm__("$7") = arg3;

	mm_segment_t old_fs;

	old_fs = get_fs();
 	set_fs(KERNEL_DS);

  	__asm__ __volatile__ (
 	"	syscall					\n"
 	: "=r" (_num), "=r" (_arg3)
 	: "r" (_num), "r" (_arg0), "r" (_arg1), "r" (_arg2), "r" (_arg3));

	set_fs(old_fs);

	/* $a3 is error flag */
	if (_arg3)
		return -_num;

	return _num;
}

static int translate_syscall_command(int cmd)
{
	int i;
	int ret = -1;

	for (i = 0; i < ARRAY_SIZE(syscall_command_table); i++) {
		if ((cmd == syscall_command_table[i].sp))
			return syscall_command_table[i].ap;
	}

	return ret;
}

static unsigned int translate_open_flags(int flags)
{
	int i;
	unsigned int ret = 0;

	for (i = 0; i < ARRAY_SIZE(open_flags_table); i++) {
		if( (flags & open_flags_table[i].sp) ) {
			ret |= open_flags_table[i].ap;
		}
	}

	return ret;
}


static void sp_setfsuidgid( uid_t uid, gid_t gid)
{
	current->cred->fsuid = uid;
	current->cred->fsgid = gid;

	key_fsuid_changed(current);
	key_fsgid_changed(current);
}

/*
 * Expects a request to be on the sysio channel. Reads it.  Decides whether
 * its a linux syscall and runs it, or whatever.  Puts the return code back
 * into the request and sends the whole thing back.
 */
void sp_work_handle_request(void)
{
	struct mtsp_syscall sc;
	struct mtsp_syscall_generic generic;
	struct mtsp_syscall_ret ret;
	struct kspd_notifications *n;
	unsigned long written;
	mm_segment_t old_fs;
	struct timeval tv;
	struct timezone tz;
	int cmd;

	char *vcwd;
	int size;

	ret.retval = -1;

	old_fs = get_fs();
	set_fs(KERNEL_DS);

	if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall))) {
		set_fs(old_fs);
		printk(KERN_ERR "Expected request but nothing to read\n");
		return;
	}

	size = sc.size;

	if (size) {
		if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size)) {
			set_fs(old_fs);
			printk(KERN_ERR "Expected request but nothing to read\n");
			return;
		}
	}

	/* Run the syscall at the privilege of the user who loaded the
	   SP program */

	if (vpe_getuid(tclimit))
		sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit));

	switch (sc.cmd) {
	/* needs the flags argument translating from SDE kit to
	   linux */
 	case MTSP_SYSCALL_PIPEFREQ:
 		ret.retval = cpu_khz * 1000;
 		ret.errno = 0;
 		break;

 	case MTSP_SYSCALL_GETTOD:
 		memset(&tz, 0, sizeof(tz));
 		if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv,
					     (int)&tz, 0, 0)) == 0)
		ret.retval = tv.tv_sec;
		break;

 	case MTSP_SYSCALL_EXIT:
		list_for_each_entry(n, &kspd_notifylist, list)
			n->kspd_sp_exit(tclimit);
		sp_stopping = 1;

		printk(KERN_DEBUG "KSPD got exit syscall from SP exitcode %d\n",
		       generic.arg0);
 		break;

 	case MTSP_SYSCALL_OPEN:
 		generic.arg1 = translate_open_flags(generic.arg1);

		vcwd = vpe_getcwd(tclimit);

		/* change to cwd of the process that loaded the SP program */
		old_fs = get_fs();
		set_fs(KERNEL_DS);
		sys_chdir(vcwd);
		set_fs(old_fs);

 		sc.cmd = __NR_open;

		/* fall through */

  	default:
 		if ((sc.cmd >= __NR_Linux) &&
		    (sc.cmd <= (__NR_Linux +  __NR_Linux_syscalls)) )
			cmd = sc.cmd;
		else
			cmd = translate_syscall_command(sc.cmd);

		if (cmd >= 0) {
			ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1,
			                        generic.arg2, generic.arg3);
		} else
 			printk(KERN_WARNING
			       "KSPD: Unknown SP syscall number %d\n", sc.cmd);
		break;
 	} /* switch */

	if (vpe_getuid(tclimit))
		sp_setfsuidgid( 0, 0);

	old_fs = get_fs();
	set_fs(KERNEL_DS);
	written = rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(ret));
	set_fs(old_fs);
	if (written < sizeof(ret))
		printk("KSPD: sp_work_handle_request failed to send to SP\n");
}

static void sp_cleanup(void)
{
	struct files_struct *files = current->files;
	int i, j;
	struct fdtable *fdt;

	j = 0;

	/*
	 * It is safe to dereference the fd table without RCU or
	 * ->file_lock
	 */
	fdt = files_fdtable(files);
	for (;;) {
		unsigned long set;
		i = j * __NFDBITS;
		if (i >= fdt->max_fds)
			break;
		set = fdt->open_fds->fds_bits[j++];
		while (set) {
			if (set & 1) {
				struct file * file = xchg(&fdt->fd[i], NULL);
				if (file)
					filp_close(file, files);
			}
			i++;
			set >>= 1;
		}
	}

	/* Put daemon cwd back to root to avoid umount problems */
	sys_chdir("/");
}

static int channel_open;

/* the work handler */
static void sp_work(struct work_struct *unused)
{
	if (!channel_open) {
		if( rtlx_open(RTLX_CHANNEL_SYSIO, 1) != 0) {
			printk("KSPD: unable to open sp channel\n");
			sp_stopping = 1;
		} else {
			channel_open++;
			printk(KERN_DEBUG "KSPD: SP channel opened\n");
		}
	} else {
		/* wait for some data, allow it to sleep */
		rtlx_read_poll(RTLX_CHANNEL_SYSIO, 1);

		/* Check we haven't been woken because we are stopping */
		if (!sp_stopping)
			sp_work_handle_request();
	}

	if (!sp_stopping)
		queue_work(workqueue, &work);
	else
		sp_cleanup();
}

static void startwork(int vpe)
{
	sp_stopping = channel_open = 0;

	if (workqueue == NULL) {
		if ((workqueue = create_singlethread_workqueue("kspd")) == NULL) {
			printk(KERN_ERR "unable to start kspd\n");
			return;
		}

		INIT_WORK(&work, sp_work);
	}

	queue_work(workqueue, &work);
}

static void stopwork(int vpe)
{
	sp_stopping = 1;

	printk(KERN_DEBUG "KSPD: SP stopping\n");
}

void kspd_notify(struct kspd_notifications *notify)
{
	list_add(&notify->list, &kspd_notifylist);
}

static struct vpe_notifications notify;
static int kspd_module_init(void)
{
	INIT_LIST_HEAD(&kspd_notifylist);

	notify.start = startwork;
	notify.stop = stopwork;
	vpe_notify(tclimit, &notify);

	return 0;
}

static void kspd_module_exit(void)
{

}

module_init(kspd_module_init);
module_exit(kspd_module_exit);

MODULE_DESCRIPTION("MIPS KSPD");
MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
MODULE_LICENSE("GPL");
Commit	Line	Data
2600990e RB	1	/*
	2	* Copyright (C) 2005 MIPS Technologies, Inc. All rights reserved.
	3	*
	4	* This program is free software; you can distribute it and/or modify it
	5	* under the terms of the GNU General Public License (Version 2) as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	11	* for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
	16	*
	17	*/
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
7f5a7716	20	#include <linux/sched.h>
2600990e RB	21	#include <linux/unistd.h>
2600990e RB	22	#include <linux/file.h>
9f3acc31	23	#include <linux/fdtable.h>
2600990e RB	24	#include <linux/fs.h>
	25	#include <linux/syscalls.h>
	26	#include <linux/workqueue.h>
	27	#include <linux/errno.h>
	28	#include <linux/list.h>
	29
	30	#include <asm/vpe.h>
	31	#include <asm/rtlx.h>
	32	#include <asm/kspd.h>
	33
982f6ffe	34	static struct workqueue_struct *workqueue;
2600990e RB	35	static struct work_struct work;
	36
	37	extern unsigned long cpu_khz;
	38
	39	struct mtsp_syscall {
	40	int cmd;
	41	unsigned char abi;
	42	unsigned char size;
	43	};
	44
	45	struct mtsp_syscall_ret {
	46	int retval;
	47	int errno;
	48	};
	49
	50	struct mtsp_syscall_generic {
	51	int arg0;
	52	int arg1;
	53	int arg2;
	54	int arg3;
	55	int arg4;
	56	int arg5;
	57	int arg6;
	58	};
	59
	60	static struct list_head kspd_notifylist;
982f6ffe	61	static int sp_stopping;
2600990e RB	62
	63	/* these should match with those in the SDE kit */
	64	#define MTSP_SYSCALL_BASE 0
	65	#define MTSP_SYSCALL_EXIT (MTSP_SYSCALL_BASE + 0)
	66	#define MTSP_SYSCALL_OPEN (MTSP_SYSCALL_BASE + 1)
	67	#define MTSP_SYSCALL_READ (MTSP_SYSCALL_BASE + 2)
	68	#define MTSP_SYSCALL_WRITE (MTSP_SYSCALL_BASE + 3)
	69	#define MTSP_SYSCALL_CLOSE (MTSP_SYSCALL_BASE + 4)
	70	#define MTSP_SYSCALL_LSEEK32 (MTSP_SYSCALL_BASE + 5)
	71	#define MTSP_SYSCALL_ISATTY (MTSP_SYSCALL_BASE + 6)
	72	#define MTSP_SYSCALL_GETTIME (MTSP_SYSCALL_BASE + 7)
	73	#define MTSP_SYSCALL_PIPEFREQ (MTSP_SYSCALL_BASE + 8)
	74	#define MTSP_SYSCALL_GETTOD (MTSP_SYSCALL_BASE + 9)
0e6ee854	75	#define MTSP_SYSCALL_IOCTL (MTSP_SYSCALL_BASE + 10)
2600990e RB	76
	77	#define MTSP_O_RDONLY 0x0000
	78	#define MTSP_O_WRONLY 0x0001
	79	#define MTSP_O_RDWR 0x0002
	80	#define MTSP_O_NONBLOCK 0x0004
	81	#define MTSP_O_APPEND 0x0008
	82	#define MTSP_O_SHLOCK 0x0010
	83	#define MTSP_O_EXLOCK 0x0020
	84	#define MTSP_O_ASYNC 0x0040
	85	#define MTSP_O_FSYNC O_SYNC
	86	#define MTSP_O_NOFOLLOW 0x0100
	87	#define MTSP_O_SYNC 0x0080
	88	#define MTSP_O_CREAT 0x0200
	89	#define MTSP_O_TRUNC 0x0400
	90	#define MTSP_O_EXCL 0x0800
	91	#define MTSP_O_BINARY 0x8000
	92
07cc0c9e	93	extern int tclimit;
2600990e RB	94
	95	struct apsp_table {
	96	int sp;
	97	int ap;
	98	};
	99
	100	/* we might want to do the mode flags too */
	101	struct apsp_table open_flags_table[] = {
	102	{ MTSP_O_RDWR, O_RDWR },
	103	{ MTSP_O_WRONLY, O_WRONLY },
	104	{ MTSP_O_CREAT, O_CREAT },
	105	{ MTSP_O_TRUNC, O_TRUNC },
	106	{ MTSP_O_NONBLOCK, O_NONBLOCK },
	107	{ MTSP_O_APPEND, O_APPEND },
	108	{ MTSP_O_NOFOLLOW, O_NOFOLLOW }
	109	};
	110
	111	struct apsp_table syscall_command_table[] = {
	112	{ MTSP_SYSCALL_OPEN, __NR_open },
	113	{ MTSP_SYSCALL_CLOSE, __NR_close },
	114	{ MTSP_SYSCALL_READ, __NR_read },
	115	{ MTSP_SYSCALL_WRITE, __NR_write },
0e6ee854 RB	116	{ MTSP_SYSCALL_LSEEK32, __NR_lseek },
0e6ee854 RB	117	{ MTSP_SYSCALL_IOCTL, __NR_ioctl }
2600990e RB	118	};
	119
	120	static int sp_syscall(int num, int arg0, int arg1, int arg2, int arg3)
	121	{
49a89efb RB	122	register long int _num __asm__("$2") = num;
	123	register long int _arg0 __asm__("$4") = arg0;
	124	register long int _arg1 __asm__("$5") = arg1;
	125	register long int _arg2 __asm__("$6") = arg2;
	126	register long int _arg3 __asm__("$7") = arg3;
2600990e RB	127
	128	mm_segment_t old_fs;
	129
	130	old_fs = get_fs();
	131	set_fs(KERNEL_DS);
	132
	133	__asm__ __volatile__ (
	134	" syscall \n"
	135	: "=r" (_num), "=r" (_arg3)
	136	: "r" (_num), "r" (_arg0), "r" (_arg1), "r" (_arg2), "r" (_arg3));
	137
	138	set_fs(old_fs);
	139
	140	/* $a3 is error flag */
	141	if (_arg3)
	142	return -_num;
	143
	144	return _num;
	145	}
	146
	147	static int translate_syscall_command(int cmd)
	148	{
	149	int i;
	150	int ret = -1;
	151
	152	for (i = 0; i < ARRAY_SIZE(syscall_command_table); i++) {
	153	if ((cmd == syscall_command_table[i].sp))
	154	return syscall_command_table[i].ap;
	155	}
	156
	157	return ret;
	158	}
	159
	160	static unsigned int translate_open_flags(int flags)
	161	{
	162	int i;
	163	unsigned int ret = 0;
	164
2b22c034	165	for (i = 0; i < ARRAY_SIZE(open_flags_table); i++) {
2600990e RB	166	if( (flags & open_flags_table[i].sp) ) {
	167	ret \|= open_flags_table[i].ap;
	168	}
	169	}
	170
	171	return ret;
	172	}
	173
	174
	175	static void sp_setfsuidgid( uid_t uid, gid_t gid)
	176	{
b6dff3ec DH	177	current->cred->fsuid = uid;
b6dff3ec DH	178	current->cred->fsgid = gid;
2600990e RB	179
	180	key_fsuid_changed(current);
	181	key_fsgid_changed(current);
	182	}
	183
	184	/*
	185	* Expects a request to be on the sysio channel. Reads it. Decides whether
	186	* its a linux syscall and runs it, or whatever. Puts the return code back
	187	* into the request and sends the whole thing back.
	188	*/
	189	void sp_work_handle_request(void)
	190	{
	191	struct mtsp_syscall sc;
	192	struct mtsp_syscall_generic generic;
	193	struct mtsp_syscall_ret ret;
	194	struct kspd_notifications *n;
46230aa6 RB	195	unsigned long written;
46230aa6 RB	196	mm_segment_t old_fs;
2600990e RB	197	struct timeval tv;
	198	struct timezone tz;
	199	int cmd;
	200
	201	char *vcwd;
2600990e RB	202	int size;
	203
	204	ret.retval = -1;
	205
46230aa6 RB	206	old_fs = get_fs();
	207	set_fs(KERNEL_DS);
	208
	209	if (!rtlx_read(RTLX_CHANNEL_SYSIO, &sc, sizeof(struct mtsp_syscall))) {
	210	set_fs(old_fs);
2600990e RB	211	printk(KERN_ERR "Expected request but nothing to read\n");
	212	return;
	213	}
	214
	215	size = sc.size;
	216
	217	if (size) {
46230aa6 RB	218	if (!rtlx_read(RTLX_CHANNEL_SYSIO, &generic, size)) {
46230aa6 RB	219	set_fs(old_fs);
2600990e RB	220	printk(KERN_ERR "Expected request but nothing to read\n");
	221	return;
	222	}
	223	}
	224
603e82ed	225	/* Run the syscall at the privilege of the user who loaded the
2600990e RB	226	SP program */
2600990e RB	227
07cc0c9e RB	228	if (vpe_getuid(tclimit))
07cc0c9e RB	229	sp_setfsuidgid(vpe_getuid(tclimit), vpe_getgid(tclimit));
2600990e RB	230
	231	switch (sc.cmd) {
	232	/* needs the flags argument translating from SDE kit to
	233	linux */
	234	case MTSP_SYSCALL_PIPEFREQ:
	235	ret.retval = cpu_khz * 1000;
	236	ret.errno = 0;
	237	break;
	238
	239	case MTSP_SYSCALL_GETTOD:
	240	memset(&tz, 0, sizeof(tz));
	241	if ((ret.retval = sp_syscall(__NR_gettimeofday, (int)&tv,
21a151d8	242	(int)&tz, 0, 0)) == 0)
2600990e	243	ret.retval = tv.tv_sec;
2600990e RB	244	break;
	245
	246	case MTSP_SYSCALL_EXIT:
	247	list_for_each_entry(n, &kspd_notifylist, list)
07cc0c9e	248	n->kspd_sp_exit(tclimit);
2600990e RB	249	sp_stopping = 1;
	250
	251	printk(KERN_DEBUG "KSPD got exit syscall from SP exitcode %d\n",
	252	generic.arg0);
	253	break;
	254
	255	case MTSP_SYSCALL_OPEN:
	256	generic.arg1 = translate_open_flags(generic.arg1);
	257
07cc0c9e	258	vcwd = vpe_getcwd(tclimit);
2600990e	259
1928cc84	260	/* change to cwd of the process that loaded the SP program */
2600990e RB	261	old_fs = get_fs();
	262	set_fs(KERNEL_DS);
	263	sys_chdir(vcwd);
	264	set_fs(old_fs);
	265
	266	sc.cmd = __NR_open;
	267
	268	/* fall through */
	269
	270	default:
	271	if ((sc.cmd >= __NR_Linux) &&
	272	(sc.cmd <= (__NR_Linux + __NR_Linux_syscalls)) )
	273	cmd = sc.cmd;
	274	else
	275	cmd = translate_syscall_command(sc.cmd);
	276
	277	if (cmd >= 0) {
	278	ret.retval = sp_syscall(cmd, generic.arg0, generic.arg1,
	279	generic.arg2, generic.arg3);
2600990e RB	280	} else
	281	printk(KERN_WARNING
	282	"KSPD: Unknown SP syscall number %d\n", sc.cmd);
	283	break;
	284	} /* switch */
	285
07cc0c9e	286	if (vpe_getuid(tclimit))
2600990e RB	287	sp_setfsuidgid( 0, 0);
2600990e RB	288
46230aa6 RB	289	old_fs = get_fs();
	290	set_fs(KERNEL_DS);
	291	written = rtlx_write(RTLX_CHANNEL_SYSIO, &ret, sizeof(ret));
	292	set_fs(old_fs);
	293	if (written < sizeof(ret))
2600990e RB	294	printk("KSPD: sp_work_handle_request failed to send to SP\n");
	295	}
	296
	297	static void sp_cleanup(void)
	298	{
	299	struct files_struct *files = current->files;
	300	int i, j;
	301	struct fdtable *fdt;
	302
	303	j = 0;
	304
	305	/*
	306	* It is safe to dereference the fd table without RCU or
	307	* ->file_lock
	308	*/
	309	fdt = files_fdtable(files);
	310	for (;;) {
	311	unsigned long set;
	312	i = j * __NFDBITS;
bbea9f69	313	if (i >= fdt->max_fds)
2600990e RB	314	break;
	315	set = fdt->open_fds->fds_bits[j++];
	316	while (set) {
	317	if (set & 1) {
	318	struct file * file = xchg(&fdt->fd[i], NULL);
	319	if (file)
	320	filp_close(file, files);
	321	}
	322	i++;
	323	set >>= 1;
	324	}
	325	}
1928cc84 KK	326
	327	/* Put daemon cwd back to root to avoid umount problems */
	328	sys_chdir("/");
2600990e RB	329	}
2600990e RB	330
982f6ffe	331	static int channel_open;
2600990e RB	332
2600990e RB	333	/* the work handler */
6d5aefb8	334	static void sp_work(struct work_struct *unused)
2600990e RB	335	{
	336	if (!channel_open) {
	337	if( rtlx_open(RTLX_CHANNEL_SYSIO, 1) != 0) {
	338	printk("KSPD: unable to open sp channel\n");
	339	sp_stopping = 1;
	340	} else {
	341	channel_open++;
	342	printk(KERN_DEBUG "KSPD: SP channel opened\n");
	343	}
	344	} else {
	345	/* wait for some data, allow it to sleep */
	346	rtlx_read_poll(RTLX_CHANNEL_SYSIO, 1);
	347
	348	/* Check we haven't been woken because we are stopping */
	349	if (!sp_stopping)
	350	sp_work_handle_request();
	351	}
	352
	353	if (!sp_stopping)
	354	queue_work(workqueue, &work);
	355	else
	356	sp_cleanup();
	357	}
	358
	359	static void startwork(int vpe)
	360	{
	361	sp_stopping = channel_open = 0;
	362
	363	if (workqueue == NULL) {
	364	if ((workqueue = create_singlethread_workqueue("kspd")) == NULL) {
	365	printk(KERN_ERR "unable to start kspd\n");
	366	return;
	367	}
	368
6d5aefb8	369	INIT_WORK(&work, sp_work);
07cc0c9e	370	}
2600990e	371
07cc0c9e	372	queue_work(workqueue, &work);
2600990e RB	373	}
	374
	375	static void stopwork(int vpe)
	376	{
	377	sp_stopping = 1;
	378
	379	printk(KERN_DEBUG "KSPD: SP stopping\n");
	380	}
	381
	382	void kspd_notify(struct kspd_notifications *notify)
	383	{
	384	list_add(&notify->list, &kspd_notifylist);
	385	}
	386
	387	static struct vpe_notifications notify;
	388	static int kspd_module_init(void)
	389	{
	390	INIT_LIST_HEAD(&kspd_notifylist);
	391
	392	notify.start = startwork;
	393	notify.stop = stopwork;
07cc0c9e	394	vpe_notify(tclimit, &notify);
2600990e RB	395
	396	return 0;
	397	}
	398
	399	static void kspd_module_exit(void)
	400	{
	401
	402	}
	403
	404	module_init(kspd_module_init);
	405	module_exit(kspd_module_exit);
	406
	407	MODULE_DESCRIPTION("MIPS KSPD");
	408	MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc.");
	409	MODULE_LICENSE("GPL");