cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mtio.h (1317B)


      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_MTIO_COMPAT_H
      3#define _LINUX_MTIO_COMPAT_H
      4
      5#include <linux/compat.h>
      6#include <uapi/linux/mtio.h>
      7#include <linux/uaccess.h>
      8
      9/*
     10 * helper functions for implementing compat ioctls on the four tape
     11 * drivers: we define the 32-bit layout of each incompatible structure,
     12 * plus a wrapper function to copy it to user space in either format.
     13 */
     14
     15struct	mtget32 {
     16	s32	mt_type;
     17	s32	mt_resid;
     18	s32	mt_dsreg;
     19	s32	mt_gstat;
     20	s32	mt_erreg;
     21	s32	mt_fileno;
     22	s32	mt_blkno;
     23};
     24#define	MTIOCGET32	_IOR('m', 2, struct mtget32)
     25
     26struct	mtpos32 {
     27	s32 	mt_blkno;
     28};
     29#define	MTIOCPOS32	_IOR('m', 3, struct mtpos32)
     30
     31static inline int put_user_mtget(void __user *u, struct mtget *k)
     32{
     33	struct mtget32 k32 = {
     34		.mt_type   = k->mt_type,
     35		.mt_resid  = k->mt_resid,
     36		.mt_dsreg  = k->mt_dsreg,
     37		.mt_gstat  = k->mt_gstat,
     38		.mt_erreg  = k->mt_erreg,
     39		.mt_fileno = k->mt_fileno,
     40		.mt_blkno  = k->mt_blkno,
     41	};
     42	int ret;
     43
     44	if (in_compat_syscall())
     45		ret = copy_to_user(u, &k32, sizeof(k32));
     46	else
     47		ret = copy_to_user(u, k, sizeof(*k));
     48
     49	return ret ? -EFAULT : 0;
     50}
     51
     52static inline int put_user_mtpos(void __user *u, struct mtpos *k)
     53{
     54	if (in_compat_syscall())
     55		return put_user(k->mt_blkno, (u32 __user *)u);
     56	else
     57		return put_user(k->mt_blkno, (long __user *)u);
     58}
     59
     60#endif