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/*
* SPU file system -- system call stubs
*
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
*
* Author: Arnd Bergmann <arndb@de.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/file.h>
#include <linux/module.h>
#include <linux/syscalls.h>
#include <asm/spu.h>
struct spufs_calls spufs_calls = {
.owner = NULL,
};
/* These stub syscalls are needed to have the actual implementation
* within a loadable module. When spufs is built into the kernel,
* this file is not used and the syscalls directly enter the fs code */
asmlinkage long sys_spu_create(const char __user *name,
unsigned int flags, mode_t mode)
{
long ret;
struct module *owner = spufs_calls.owner;
ret = -ENOSYS;
if (owner && try_module_get(spufs_calls.owner)) {
ret = spufs_calls.create_thread(name, flags, mode);
module_put(owner);
}
return ret;
}
asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus)
{
long ret;
struct file *filp;
int fput_needed;
struct module *owner = spufs_calls.owner;
ret = -ENOSYS;
if (owner && try_module_get(owner)) {
ret = -EBADF;
filp = fget_light(fd, &fput_needed);
if (filp) {
ret = spufs_calls.spu_run(filp, unpc, ustatus);
fput_light(filp, fput_needed);
}
module_put(owner);
}
return ret;
}
int register_spu_syscalls(struct spufs_calls *calls)
{
if (spufs_calls.owner)
return -EBUSY;
spufs_calls.create_thread = calls->create_thread;
spufs_calls.spu_run = calls->spu_run;
smp_mb();
spufs_calls.owner = calls->owner;
return 0;
}
EXPORT_SYMBOL_GPL(register_spu_syscalls);
void unregister_spu_syscalls(struct spufs_calls *calls)
{
BUG_ON(spufs_calls.owner != calls->owner);
spufs_calls.owner = NULL;
}
EXPORT_SYMBOL_GPL(unregister_spu_syscalls);
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