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#include <linux/file.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/namei.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;
}
#ifndef MODULE
asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus)
{
int fput_needed;
struct file *filp;
long ret;
ret = -EBADF;
filp = fget_light(fd, &fput_needed);
if (filp) {
ret = do_spu_run(filp, unpc, ustatus);
fput_light(filp, fput_needed);
}
return ret;
}
#endif
asmlinkage long do_spu_create(const char __user *pathname, unsigned int flags,
mode_t mode, struct file *neighbor)
{
char *tmp;
int ret;
tmp = getname(pathname);
ret = PTR_ERR(tmp);
if (!IS_ERR(tmp)) {
struct nameidata nd;
ret = path_lookup(tmp, LOOKUP_PARENT|
LOOKUP_OPEN|LOOKUP_CREATE, &nd);
if (!ret) {
ret = spufs_create(&nd, flags, mode, neighbor);
path_release(&nd);
}
putname(tmp);
}
return ret;
}
#ifndef MODULE
asmlinkage long sys_spu_create(const char __user *pathname, unsigned int flags,
mode_t mode, int neighbor_fd)
{
int fput_needed;
struct file *neighbor;
long ret;
if (flags & SPU_CREATE_AFFINITY_SPU) {
ret = -EBADF;
neighbor = fget_light(neighbor_fd, &fput_needed);
if (neighbor) {
ret = do_spu_create(pathname, flags, mode, neighbor);
fput_light(neighbor, fput_needed);
}
}
else {
ret = do_spu_create(pathname, flags, mode, NULL);
}
return ret;
}
#endif
struct spufs_calls spufs_calls = {
.create_thread = do_spu_create,
.spu_run = do_spu_run,
.owner = THIS_MODULE,
};
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