c0a1fd1292
- the magic numbers ANY, NONE and SELF are kept for the compatibility with the current userspace. It is OK as long as NR_PROCS is greater so they don't colide with other endpoints - the 32 bit endpoint_t value is split in half, lower 16 bits for process slot number and upper half for generation number - transition to a structured endpoint_t in the future possible
29 lines
1020 B
C
29 lines
1020 B
C
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#ifndef _MINIX_ENDPOINT_H
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#define _MINIX_ENDPOINT_H 1
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#include <minix/sys_config.h>
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#include <minix/com.h>
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#include <limits.h>
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/* The point of the padding in 'generation size' is to
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* allow for certain bogus endpoint numbers such as NONE, ANY, etc.
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*
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* The _MAX_MAGIC_PROC is defined by <minix/com.h>. That include
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* file defines some magic process numbers such as ANY and NONE,
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* and must never be a valid endpoint number. Therefore we make sure
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* the generation size is big enough to start the next generation
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* above the highest magic number.
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*/
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#define _ENDPOINT_GENERATION_BITS 16
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#define _ENDPOINT_PNUM_BITS 16
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#define _ENDPOINT_MAX_GENERATION ((1 << _ENDPOINT_GENERATION_BITS)-1)
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#define _ENDPOINT_MAX_PNUM ((1 << _ENDPOINT_PNUM_BITS) - 1)
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/* Generation + Process slot number <-> endpoint. */
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#define _ENDPOINT(g, p) ((endpoint_t)(((g) << _ENDPOINT_PNUM_BITS) | (p)))
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#define _ENDPOINT_G(e) ((u16_t)((e) >> _ENDPOINT_PNUM_BITS))
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#define _ENDPOINT_P(e) ((i16_t)((e) & _ENDPOINT_MAX_PNUM))
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#endif
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