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1 |
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2 | #ifndef _MINIX_ENDPOINT_H
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3 | #define _MINIX_ENDPOINT_H 1
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4 |
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5 | #include <minix/sys_config.h>
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6 | #include <minix/com.h>
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7 | #include <limits.h>
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8 |
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9 | /* The point of the padding in 'generation size' is to
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10 | * allow for certain bogus endpoint numbers such as NONE, ANY, etc.
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11 | *
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12 | * The _MAX_MAGIC_PROC is defined by <minix/com.h>. That include
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13 | * file defines some magic process numbers such as ANY and NONE,
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14 | * and must never be a valid endpoint number. Therefore we make sure
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15 | * the generation size is big enough to start the next generation
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16 | * above the highest magic number.
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17 | */
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18 | #define _ENDPOINT_GENERATION_SIZE (NR_TASKS+_MAX_MAGIC_PROC+1)
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19 | #define _ENDPOINT_MAX_GENERATION (INT_MAX/_ENDPOINT_GENERATION_SIZE-1)
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20 |
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21 | /* Generation + Process slot number <-> endpoint. */
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22 | #define _ENDPOINT(g, p) ((g) * _ENDPOINT_GENERATION_SIZE + (p))
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23 | #define _ENDPOINT_G(e) (((e)+NR_TASKS) / _ENDPOINT_GENERATION_SIZE)
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24 | #define _ENDPOINT_P(e) ((((e)+NR_TASKS) % _ENDPOINT_GENERATION_SIZE) - NR_TASKS)
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25 |
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26 | #endif
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