39 lines
1.6 KiB
C
39 lines
1.6 KiB
C
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#ifndef _KERNEL_ALGO_RINGBUFFER_H
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#define _KERNEL_ALGO_RINGBUFFER_H
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#include <libkern/libkern.h>
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#include <libkern/lock.h>
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#include <mem/kmemzone.h>
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#define RINGBUFFER_STD_SIZE (16 * KB)
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struct __ringbuffer {
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kmemzone_t zone;
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size_t start;
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size_t end;
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};
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typedef struct __ringbuffer ringbuffer_t;
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ringbuffer_t ringbuffer_create(size_t size);
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static ALWAYS_INLINE ringbuffer_t ringbuffer_create_std() { return ringbuffer_create(RINGBUFFER_STD_SIZE); }
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void ringbuffer_free(ringbuffer_t* rbuf);
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ssize_t ringbuffer_space_to_read_from(ringbuffer_t* rbuf, size_t start);
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ssize_t ringbuffer_space_to_read(ringbuffer_t* rbuf);
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ssize_t ringbuffer_space_to_write(ringbuffer_t* rbuf);
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size_t ringbuffer_read_from(ringbuffer_t* rbuf, size_t ustart, uint8_t __user* buf, size_t siz);
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size_t ringbuffer_read_user_from(ringbuffer_t* rbuf, size_t ustart, uint8_t __user* buf, size_t siz);
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size_t ringbuffer_read(ringbuffer_t* rbuf, uint8_t*, size_t);
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size_t ringbuffer_read_user(ringbuffer_t* rbuf, uint8_t __user* buf, size_t siz);
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size_t ringbuffer_write(ringbuffer_t* rbuf, const uint8_t*, size_t);
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size_t ringbuffer_write_user(ringbuffer_t* rbuf, const uint8_t __user* buf, size_t siz);
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size_t ringbuffer_write_ignore_bounds(ringbuffer_t* rbuf, const uint8_t* buf, size_t siz);
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size_t ringbuffer_write_user_ignore_bounds(ringbuffer_t* rbuf, const uint8_t* __user buf, size_t siz);
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size_t ringbuffer_read_one(ringbuffer_t* rbuf, uint8_t* data);
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size_t ringbuffer_write_one(ringbuffer_t* rbuf, uint8_t data);
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void ringbuffer_clear(ringbuffer_t* rbuf);
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#endif //_KERNEL_ALGO_RINGBUFFER_H
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