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syscalls.c

#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;
}

static 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, &nd);
            if (!ret) {
                  nd.flags |= LOOKUP_OPEN | LOOKUP_CREATE;
                  ret = spufs_create(&nd, flags, mode, neighbor);
                  path_put(&nd.path);
            }
            putname(tmp);
      }

      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,
};

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