original development tree for Linux kernel GTP module; now long in mainline.
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#include <linux/file.h>
#include <linux/fs.h>
#include <linux/export.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include "spufs.h"
/**
* sys_spu_run - run code loaded into an SPU
*
* @unpc: next program counter for the SPU
* @ustatus: status of the SPU
*
* This system call transfers the control of execution of a
* user space thread to an SPU. It will return when the
* SPU has finished executing or when it hits an error
* condition and it will be interrupted if a signal needs
* to be delivered to a handler in user space.
*
* The next program counter is set to the passed value
* before the SPU starts fetching code and the user space
* pointer gets updated with the new value when returning
* from kernel space.
*
* The status value returned from spu_run reflects the
* value of the spu_status register after the SPU has stopped.
*
*/
static long do_spu_run(struct file *filp,
__u32 __user *unpc,
__u32 __user *ustatus)
{
long ret;
struct spufs_inode_info *i;
u32 npc, status;
ret = -EFAULT;
if (get_user(npc, unpc))
goto out;
/* check if this file was created by spu_create */
ret = -EINVAL;
if (filp->f_op != &spufs_context_fops)
goto out;
i = SPUFS_I(filp->f_path.dentry->d_inode);
ret = spufs_run_spu(i->i_ctx, &npc, &status);
if (put_user(npc, unpc))
ret = -EFAULT;
if (ustatus && put_user(status, ustatus))
ret = -EFAULT;
out:
return ret;
}
static long do_spu_create(const char __user *pathname, unsigned int flags,
umode_t mode, struct file *neighbor)
{
struct path path;
struct dentry *dentry;
int ret;
dentry = user_path_create(AT_FDCWD, pathname, &path, 1);
ret = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
ret = spufs_create(&path, dentry, flags, mode, neighbor);
mutex_unlock(&path.dentry->d_inode->i_mutex);
dput(dentry);
path_put(&path);
}
return ret;
}
struct spufs_calls spufs_calls = {
.create_thread = do_spu_create,
.spu_run = do_spu_run,
.coredump_extra_notes_size = spufs_coredump_extra_notes_size,
.coredump_extra_notes_write = spufs_coredump_extra_notes_write,
.notify_spus_active = do_notify_spus_active,
.owner = THIS_MODULE,
};