BITMAP_REMAP - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic Kernel Library Functions

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NAMEbitmap_remap − Apply map defined by a pair of bitmaps to another bitmap

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SYNOPSISvoid bitmap_remap(unsigned long * dst, const unsigned long * src, const unsigned long * old, const unsigned long * new, int bits);

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ARGUMENTSdst remapped result src subset to be remapped old defines domain of map new defines range of map bits number of bits in each of these bitmaps

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DESCRIPTIONLet old and new define a mapping of bit positions, such that whatever position is held by the n−th set bit in old is mapped to the n−th set bit in new​. In the more general case, allowing for the possibility that the weight ´w´ of new is less than the weight of old, map the position of the n−th set bit in old to the position of the m−th set bit in new, where m == n % w​. If either of the old and new bitmaps are empty, or if src and dst point to the same location, then this routine copies src to dst​. The positions of unset bits in old are mapped to themselves (the identify map)​. Apply the above specified mapping to src, placing the result in dst, clearing any bits previously set in dst​. For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set​. This defines the mapping of bit position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other bit positions unchanged​. So if say src comes into this routine with bits 1, 5 and 7 set, then dst should leave with bits 1, 13 and 15 set​.

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Online Linux Manual Page   :   Version   :   Online Linux Manual Page - Fedora.40 - march=x86-64 - mtune=generic - 24.12.05
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