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088e7b727d
Also a bunch of somewhat related changes, I was too lazy to break this into more than one commit
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
#ifndef DEV_H
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#define DEV_H
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#include <sys/types.h>
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#if __linux__
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#include <sys/sysmacros.h>
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#endif
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#include "fs/fd.h"
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// a dev_t is encoded like this in hex, where M is major and m is minor:
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// mmmMMMmm
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// (legacy I guess)
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typedef uint32_t dev_t_;
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static inline dev_t_ dev_make(int major, int minor) {
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return ((minor & 0xfff00) << 12) | (major << 8) | (minor & 0xff);
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}
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static inline int dev_major(dev_t_ dev) {
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return (dev & 0xfff00) >> 8;
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}
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static inline int dev_minor(dev_t_ dev) {
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return ((dev & 0xfff00000) >> 12) | (dev & 0xff);
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}
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static inline dev_t dev_real_from_fake(dev_t_ dev) {
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return makedev(dev_major(dev), dev_minor(dev));
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}
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static inline dev_t_ dev_fake_from_real(dev_t dev) {
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return dev_make(major(dev), minor(dev));
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}
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#define DEV_BLOCK 0
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#define DEV_CHAR 1
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struct dev_ops {
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int (*open)(int major, int minor, struct fd *fd);
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struct fd_ops fd;
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};
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extern struct dev_ops *block_devs[];
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extern struct dev_ops *char_devs[];
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int dev_open(int major, int minor, int type, struct fd *fd);
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extern struct dev_ops null_dev;
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#endif
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