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/*
* linux/include/linux/switches.h
*
* Copyright (C) 2000 John Dorsey
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 23 October 2000 - created.
*/
#if !defined(_LINUX_SWITCHES_H)
#define _LINUX_SWITCHES_H
#define SWITCHES_MASK_SIZE (128)
typedef unsigned long switches_bitfield;
#define SWITCHES_BITS (sizeof(switches_bitfield) * 8)
#define SWITCHES_NUM_FIELDS (SWITCHES_MASK_SIZE / SWITCHES_BITS)
#define SWITCHES_FIELD_SELECT(i) ((i) / SWITCHES_BITS)
#define SWITCHES_FIELD_MASK(i) ((switches_bitfield)(1 << (i) % \
SWITCHES_BITS))
typedef struct switches_mask_t {
unsigned int count;
switches_bitfield events[SWITCHES_NUM_FIELDS];
switches_bitfield states[SWITCHES_NUM_FIELDS];
} switches_mask_t;
#define SWITCHES_ZERO(m) \
do { \
unsigned int sz_i; \
(m)->count = 0; \
for(sz_i = 0; sz_i < SWITCHES_NUM_FIELDS; ++sz_i) \
(m)->events[sz_i] = (m)->states[sz_i] = 0; \
} while (0)
/* `s' is the state of the switch, either 0 or non-zero: */
#define SWITCHES_SET(m, i, s) \
do { \
((m)->events[SWITCHES_FIELD_SELECT((i))] |= \
SWITCHES_FIELD_MASK((i))); \
if(s) \
((m)->states[SWITCHES_FIELD_SELECT((i))] |= \
SWITCHES_FIELD_MASK((i))); \
else \
((m)->states[SWITCHES_FIELD_SELECT((i))] &= \
~SWITCHES_FIELD_MASK((i))); \
++((m)->count); \
} while (0)
/* Should only use to clear an event set by SWITCHES_SET(): */
#define SWITCHES_CLEAR(m, i) \
do { \
((m)->events[SWITCHES_FIELD_SELECT((i))] &= \
~SWITCHES_FIELD_MASK((i))); \
((m)->states[SWITCHES_FIELD_SELECT((i))] &= \
~SWITCHES_FIELD_MASK((i))); \
--((m)->count); \
}
#define SWITCHES_COUNT(m) ((m)->count)
/* Returns 0 or non-zero: */
#define SWITCHES_EVENT(m, i) \
((m)->events[SWITCHES_FIELD_SELECT((i))] & SWITCHES_FIELD_MASK((i)))
/* Returns 0 or non-zero: */
#define SWITCHES_STATE(m, i) \
((m)->states[SWITCHES_FIELD_SELECT((i))] & SWITCHES_FIELD_MASK((i)))
#endif /* !defined(_LINUX_SWITCHES_H) */
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