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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kdev_t.h (1843B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _LINUX_KDEV_T_H
      3#define _LINUX_KDEV_T_H
      4
      5#include <uapi/linux/kdev_t.h>
      6
      7#define MINORBITS	20
      8#define MINORMASK	((1U << MINORBITS) - 1)
      9
     10#define MAJOR(dev)	((unsigned int) ((dev) >> MINORBITS))
     11#define MINOR(dev)	((unsigned int) ((dev) & MINORMASK))
     12#define MKDEV(ma,mi)	(((ma) << MINORBITS) | (mi))
     13
     14#define print_dev_t(buffer, dev)					\
     15	sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev))
     16
     17#define format_dev_t(buffer, dev)					\
     18	({								\
     19		sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev));	\
     20		buffer;							\
     21	})
     22
     23/* acceptable for old filesystems */
     24static __always_inline bool old_valid_dev(dev_t dev)
     25{
     26	return MAJOR(dev) < 256 && MINOR(dev) < 256;
     27}
     28
     29static __always_inline u16 old_encode_dev(dev_t dev)
     30{
     31	return (MAJOR(dev) << 8) | MINOR(dev);
     32}
     33
     34static __always_inline dev_t old_decode_dev(u16 val)
     35{
     36	return MKDEV((val >> 8) & 255, val & 255);
     37}
     38
     39static __always_inline u32 new_encode_dev(dev_t dev)
     40{
     41	unsigned major = MAJOR(dev);
     42	unsigned minor = MINOR(dev);
     43	return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
     44}
     45
     46static __always_inline dev_t new_decode_dev(u32 dev)
     47{
     48	unsigned major = (dev & 0xfff00) >> 8;
     49	unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
     50	return MKDEV(major, minor);
     51}
     52
     53static __always_inline u64 huge_encode_dev(dev_t dev)
     54{
     55	return new_encode_dev(dev);
     56}
     57
     58static __always_inline dev_t huge_decode_dev(u64 dev)
     59{
     60	return new_decode_dev(dev);
     61}
     62
     63static __always_inline int sysv_valid_dev(dev_t dev)
     64{
     65	return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18);
     66}
     67
     68static __always_inline u32 sysv_encode_dev(dev_t dev)
     69{
     70	return MINOR(dev) | (MAJOR(dev) << 18);
     71}
     72
     73static __always_inline unsigned sysv_major(u32 dev)
     74{
     75	return (dev >> 18) & 0x3fff;
     76}
     77
     78static __always_inline unsigned sysv_minor(u32 dev)
     79{
     80	return dev & 0x3ffff;
     81}
     82
     83#endif