SET(9) BSD Kernel Developer's Manual SET(9)NAME
SET -- primitive bit macros
These macros define three standard bit-operations:
1. SET() sets the bit x in val;
2. CLR() clears the bit x in val; and
3. ISSET() returns 1 if the bit x is set in val.
SEE ALSO bits(3)BUGS
The rationale is to provide clarity in the source code, but arguably these operations are clear enough without the use of the macros.
BSD April 13, 2010 BSD
Check Out this Related Man Page
BITS(3) BSD Library Functions Manual BITS(3)NAME
__BIT, __BITS, __SHIFTIN, __SHIFTOUT, __SHIFTOUT_MASK -- macros for preparing bitmasks and operating on bit fields
These macros prepare bitmasks, extract bitfields from words, and insert bitfields into words. A ``bitfield'' is a span of consecutive bits
defined by a bitmask, where 1s select the bits in the bitfield.
Use __BIT() and __BITS() to define bitmasks:
Return a bitmask with bit n set, where the least significant bit is bit 0.
Return a bitmask with bits m through n, inclusive, set. It does not matter whether m > n or m <= n. The least significant bit
is bit 0.
__SHIFTIN(), __SHIFTOUT(), and __SHIFTOUT_MASK() help read and write bitfields from words:
Left-shift bits v into the bitfield defined by mask, and return them. No side-effects.
Extract and return the bitfield selected by mask from v, right-shifting the bits so that the rightmost selected bit is
at bit 0. No side-effects.
Right-shift the bits in mask so that the rightmost non-zero bit is at bit 0. This is useful for finding the greatest
unsigned value that a bitfield can hold. No side-effects. Note that __SHIFTOUT_MASK(m) = __SHIFTOUT(m, m).
The following example demonstrates basic usage of the bits macros:
uint32_t bits, mask, val;
bits = __BITS(2, 3); /* 00001100 */
mask = __BIT(2) | __BIT(3); /* 00001100 */
val = __SHIFTIN(0x03, mask); /* 00001100 */
val = __SHIFTOUT(0xf, mask); /* 00000011 */
SEE ALSO bitops(3), cdefs(3)HISTORY
The bits macros first appeared in atw(4), with different names and implementation. In their current form these macros appeared in
The bits macros were written by David Young <dyoung@NetBSD.org>.
Matt Thomas <matt@NetBSD.org> suggested important improvements to the implementation, and contributed the macro names SHIFTIN() and
__BIT() and __BITS() can only express 32-bit bitmasks.
BSD October 17, 2012 BSD
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