26 lines
971 B
C
26 lines
971 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_SIZE (NR_TASKS+_MAX_MAGIC_PROC+1)
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#define _ENDPOINT_MAX_GENERATION (INT_MAX/_ENDPOINT_GENERATION_SIZE-1)
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/* Generation + Process slot number <-> endpoint. */
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#define _ENDPOINT(g, p) ((g) * _ENDPOINT_GENERATION_SIZE + (p))
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#define _ENDPOINT_G(e) (((e)+NR_TASKS) / _ENDPOINT_GENERATION_SIZE)
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#define _ENDPOINT_P(e) ((((e)+NR_TASKS) % _ENDPOINT_GENERATION_SIZE) - NR_TASKS)
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#endif
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