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bitops: Add MAKE_64BIT_MASK macro

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Add a macro that creates a 64bit value which has length number of ones
shifted across by the value of shift.

Backports commit ae2923b5c20a21c6457680330506a9c13873485c from qemu
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Alistair Francis 2018-02-25 00:30:30 -05:00 committed by Lioncash
parent efc6cc2b83
commit fbb0645fb3
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1 changed files with 3 additions and 0 deletions
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3
qemu/include/qemu/bitops.h
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@ -26,6 +26,9 @@
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG) #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
#define MAKE_64BIT_MASK(shift, length) \
(((~0ULL) >> (64 - (length))) << (shift))
/** /**
* set_bit - Set a bit in memory * set_bit - Set a bit in memory
* @nr: the bit to set * @nr: the bit to set