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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef _LINUX_KDEV_T_H |
| 2 | #define _LINUX_KDEV_T_H |
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| 3 | #ifdef __KERNEL__ |
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| 4 | #define MINORBITS 20 |
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| 5 | #define MINORMASK ((1U << MINORBITS) - 1) |
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| 6 | |||
| 7 | #define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS)) |
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| 8 | #define MINOR(dev) ((unsigned int) ((dev) & MINORMASK)) |
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| 9 | #define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi)) |
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| 10 | |||
| 11 | #define print_dev_t(buffer, dev) \ |
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| 12 | sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev)) |
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| 13 | |||
| 14 | #define format_dev_t(buffer, dev) \ |
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| 15 | ({ \ |
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| 16 | sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \ |
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| 17 | buffer; \ |
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| 18 | }) |
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| 19 | |||
| 20 | /* acceptable for old filesystems */ |
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| 21 | static inline int old_valid_dev(dev_t dev) |
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| 22 | { |
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| 23 | return MAJOR(dev) < 256 && MINOR(dev) < 256; |
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| 24 | } |
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| 25 | |||
| 26 | static inline u16 old_encode_dev(dev_t dev) |
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| 27 | { |
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| 28 | return (MAJOR(dev) << 8) | MINOR(dev); |
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| 29 | } |
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| 30 | |||
| 31 | static inline dev_t old_decode_dev(u16 val) |
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| 32 | { |
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| 33 | return MKDEV((val >> 8) & 255, val & 255); |
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| 34 | } |
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| 35 | |||
| 36 | static inline int new_valid_dev(dev_t dev) |
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| 37 | { |
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| 38 | return 1; |
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| 39 | } |
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| 40 | |||
| 41 | static inline u32 new_encode_dev(dev_t dev) |
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| 42 | { |
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| 43 | unsigned major = MAJOR(dev); |
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| 44 | unsigned minor = MINOR(dev); |
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| 45 | return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); |
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| 46 | } |
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| 47 | |||
| 48 | static inline dev_t new_decode_dev(u32 dev) |
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| 49 | { |
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| 50 | unsigned major = (dev & 0xfff00) >> 8; |
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| 51 | unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); |
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| 52 | return MKDEV(major, minor); |
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| 53 | } |
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| 54 | |||
| 55 | static inline int huge_valid_dev(dev_t dev) |
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| 56 | { |
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| 57 | return 1; |
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| 58 | } |
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| 59 | |||
| 60 | static inline u64 huge_encode_dev(dev_t dev) |
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| 61 | { |
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| 62 | return new_encode_dev(dev); |
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| 63 | } |
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| 64 | |||
| 65 | static inline dev_t huge_decode_dev(u64 dev) |
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| 66 | { |
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| 67 | return new_decode_dev(dev); |
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| 68 | } |
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| 69 | |||
| 70 | static inline int sysv_valid_dev(dev_t dev) |
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| 71 | { |
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| 72 | return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18); |
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| 73 | } |
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| 74 | |||
| 75 | static inline u32 sysv_encode_dev(dev_t dev) |
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| 76 | { |
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| 77 | return MINOR(dev) | (MAJOR(dev) << 18); |
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| 78 | } |
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| 79 | |||
| 80 | static inline unsigned sysv_major(u32 dev) |
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| 81 | { |
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| 82 | return (dev >> 18) & 0x3fff; |
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| 83 | } |
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| 84 | |||
| 85 | static inline unsigned sysv_minor(u32 dev) |
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| 86 | { |
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| 87 | return dev & 0x3ffff; |
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| 88 | } |
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| 89 | |||
| 90 | |||
| 91 | #else /* __KERNEL__ */ |
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| 92 | |||
| 93 | /* |
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| 94 | Some programs want their definitions of MAJOR and MINOR and MKDEV |
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| 95 | from the kernel sources. These must be the externally visible ones. |
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| 96 | */ |
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| 97 | #define MAJOR(dev) ((dev)>>8) |
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| 98 | #define MINOR(dev) ((dev) & 0xff) |
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| 99 | #define MKDEV(ma,mi) ((ma)<<8 | (mi)) |
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| 100 | #endif /* __KERNEL__ */ |
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| 101 | #endif |