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103 lines
2.2 KiB
103 lines
2.2 KiB
#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <asm/uaccess.h>
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#include "spufs.h"
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/**
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* sys_spu_run - run code loaded into an SPU
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*
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* @unpc: next program counter for the SPU
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* @ustatus: status of the SPU
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*
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* This system call transfers the control of execution of a
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* user space thread to an SPU. It will return when the
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* SPU has finished executing or when it hits an error
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* condition and it will be interrupted if a signal needs
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* to be delivered to a handler in user space.
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*
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* The next program counter is set to the passed value
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* before the SPU starts fetching code and the user space
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* pointer gets updated with the new value when returning
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* from kernel space.
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*
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* The status value returned from spu_run reflects the
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* value of the spu_status register after the SPU has stopped.
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*
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*/
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static long do_spu_run(struct file *filp,
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__u32 __user *unpc,
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__u32 __user *ustatus)
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{
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long ret;
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struct spufs_inode_info *i;
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u32 npc, status;
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ret = -EFAULT;
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if (get_user(npc, unpc) || get_user(status, ustatus))
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goto out;
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/* check if this file was created by spu_create */
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ret = -EINVAL;
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if (filp->f_op != &spufs_context_fops)
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goto out;
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i = SPUFS_I(filp->f_dentry->d_inode);
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ret = spufs_run_spu(filp, i->i_ctx, &npc, &status);
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if (put_user(npc, unpc) || put_user(status, ustatus))
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ret = -EFAULT;
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out:
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return ret;
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}
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#ifndef MODULE
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asmlinkage long sys_spu_run(int fd, __u32 __user *unpc, __u32 __user *ustatus)
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{
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int fput_needed;
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struct file *filp;
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long ret;
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ret = -EBADF;
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filp = fget_light(fd, &fput_needed);
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if (filp) {
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ret = do_spu_run(filp, unpc, ustatus);
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fput_light(filp, fput_needed);
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}
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return ret;
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}
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#endif
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asmlinkage long sys_spu_create(const char __user *pathname,
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unsigned int flags, mode_t mode)
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{
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char *tmp;
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int ret;
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tmp = getname(pathname);
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ret = PTR_ERR(tmp);
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if (!IS_ERR(tmp)) {
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struct nameidata nd;
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ret = path_lookup(tmp, LOOKUP_PARENT|
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LOOKUP_OPEN|LOOKUP_CREATE, &nd);
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if (!ret) {
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ret = spufs_create_thread(&nd, flags, mode);
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path_release(&nd);
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}
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putname(tmp);
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}
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return ret;
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}
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struct spufs_calls spufs_calls = {
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.create_thread = sys_spu_create,
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.spu_run = do_spu_run,
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.owner = THIS_MODULE,
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};
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