From 8a6d48c0542876eb3acfc0970c0ab7872db08d5f Mon Sep 17 00:00:00 2001 From: Zheng Da Date: Sun, 6 Dec 2009 05:26:23 +0100 Subject: check in the original version of dde linux26. --- libdde_linux26/contrib/include/linux/kdev_t.h | 100 ++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 libdde_linux26/contrib/include/linux/kdev_t.h (limited to 'libdde_linux26/contrib/include/linux/kdev_t.h') diff --git a/libdde_linux26/contrib/include/linux/kdev_t.h b/libdde_linux26/contrib/include/linux/kdev_t.h new file mode 100644 index 00000000..2dacab8b --- /dev/null +++ b/libdde_linux26/contrib/include/linux/kdev_t.h @@ -0,0 +1,100 @@ +#ifndef _LINUX_KDEV_T_H +#define _LINUX_KDEV_T_H +#ifdef __KERNEL__ +#define MINORBITS 20 +#define MINORMASK ((1U << MINORBITS) - 1) + +#define MAJOR(dev) ((unsigned int) ((dev) >> MINORBITS)) +#define MINOR(dev) ((unsigned int) ((dev) & MINORMASK)) +#define MKDEV(ma,mi) (((ma) << MINORBITS) | (mi)) + +#define print_dev_t(buffer, dev) \ + sprintf((buffer), "%u:%u\n", MAJOR(dev), MINOR(dev)) + +#define format_dev_t(buffer, dev) \ + ({ \ + sprintf(buffer, "%u:%u", MAJOR(dev), MINOR(dev)); \ + buffer; \ + }) + +/* acceptable for old filesystems */ +static inline int old_valid_dev(dev_t dev) +{ + return MAJOR(dev) < 256 && MINOR(dev) < 256; +} + +static inline u16 old_encode_dev(dev_t dev) +{ + return (MAJOR(dev) << 8) | MINOR(dev); +} + +static inline dev_t old_decode_dev(u16 val) +{ + return MKDEV((val >> 8) & 255, val & 255); +} + +static inline int new_valid_dev(dev_t dev) +{ + return 1; +} + +static inline u32 new_encode_dev(dev_t dev) +{ + unsigned major = MAJOR(dev); + unsigned minor = MINOR(dev); + return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12); +} + +static inline dev_t new_decode_dev(u32 dev) +{ + unsigned major = (dev & 0xfff00) >> 8; + unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00); + return MKDEV(major, minor); +} + +static inline int huge_valid_dev(dev_t dev) +{ + return 1; +} + +static inline u64 huge_encode_dev(dev_t dev) +{ + return new_encode_dev(dev); +} + +static inline dev_t huge_decode_dev(u64 dev) +{ + return new_decode_dev(dev); +} + +static inline int sysv_valid_dev(dev_t dev) +{ + return MAJOR(dev) < (1<<14) && MINOR(dev) < (1<<18); +} + +static inline u32 sysv_encode_dev(dev_t dev) +{ + return MINOR(dev) | (MAJOR(dev) << 18); +} + +static inline unsigned sysv_major(u32 dev) +{ + return (dev >> 18) & 0x3fff; +} + +static inline unsigned sysv_minor(u32 dev) +{ + return dev & 0x3ffff; +} + +#else /* __KERNEL__ */ + +/* +Some programs want their definitions of MAJOR and MINOR and MKDEV +from the kernel sources. These must be the externally visible ones. +*/ +#define MAJOR(dev) ((dev)>>8) +#define MINOR(dev) ((dev) & 0xff) +#define MKDEV(ma,mi) ((ma)<<8 | (mi)) +#endif /* __KERNEL__ */ +#endif -- cgit v1.2.3