1/*
2 * SPU file system -- system call stubs
3 *
4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
5 *
6 * Author: Arnd Bergmann <arndb@de.ibm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22#include <linux/file.h>
23#include <linux/module.h>
24#include <linux/syscalls.h>
25
26#include <asm/spu.h>
27
28struct spufs_calls spufs_calls = {
29	.owner = NULL,
30};
31
32/* These stub syscalls are needed to have the actual implementation
33 * within a loadable module. When spufs is built into the kernel,
34 * this file is not used and the syscalls directly enter the fs code */
35
36asmlinkage long sys_spu_create(const char __user *name,
37		unsigned int flags, mode_t mode)
38{
39	long ret;
40	struct module *owner = spufs_calls.owner;
41
42	ret = -ENOSYS;
43	if (owner && try_module_get(owner)) {
44		ret = spufs_calls.create_thread(name, flags, mode);
45		module_put(owner);
46	}
47	return ret;
48}
49
50asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus)
51{
52	long ret;
53	struct file *filp;
54	int fput_needed;
55	struct module *owner = spufs_calls.owner;
56
57	ret = -ENOSYS;
58	if (owner && try_module_get(owner)) {
59		ret = -EBADF;
60		filp = fget_light(fd, &fput_needed);
61		if (filp) {
62			ret = spufs_calls.spu_run(filp, unpc, ustatus);
63			fput_light(filp, fput_needed);
64		}
65		module_put(owner);
66	}
67	return ret;
68}
69
70int register_spu_syscalls(struct spufs_calls *calls)
71{
72	if (spufs_calls.owner)
73		return -EBUSY;
74
75	spufs_calls.create_thread = calls->create_thread;
76	spufs_calls.spu_run = calls->spu_run;
77	smp_mb();
78	spufs_calls.owner = calls->owner;
79	return 0;
80}
81EXPORT_SYMBOL_GPL(register_spu_syscalls);
82
83void unregister_spu_syscalls(struct spufs_calls *calls)
84{
85	BUG_ON(spufs_calls.owner != calls->owner);
86	spufs_calls.owner = NULL;
87}
88EXPORT_SYMBOL_GPL(unregister_spu_syscalls);
89