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https://github.com/xen-project/xen.git
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Olaf Hering
8862cb679c
There are no users left, xenpaging has its own variant.
The last user was removed with commit 11d0044a16
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Acked-by: Wei Liu <wl@xen.org>
81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
#ifndef XC_BITOPS_H
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#define XC_BITOPS_H 1
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/* bitmap operations for single threaded access */
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#include <stdlib.h>
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#include <string.h>
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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#define BITMAP_ENTRY(_nr,_bmap) ((_bmap))[(_nr) / 8]
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#define BITMAP_SHIFT(_nr) ((_nr) % 8)
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/* calculate required space for number of bytes needed to hold nr_bits */
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static inline unsigned long bitmap_size(unsigned long nr_bits)
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{
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return (nr_bits + 7) / 8;
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}
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static inline void *bitmap_alloc(unsigned long nr_bits)
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{
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unsigned long longs;
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longs = (nr_bits + BITS_PER_LONG - 1) / BITS_PER_LONG;
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return calloc(longs, sizeof(unsigned long));
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}
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static inline void bitmap_set(void *addr, unsigned long nr_bits)
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{
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memset(addr, 0xff, bitmap_size(nr_bits));
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}
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static inline void bitmap_clear(void *addr, unsigned long nr_bits)
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{
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memset(addr, 0, bitmap_size(nr_bits));
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}
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static inline int test_bit(unsigned long nr, const void *_addr)
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{
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const char *addr = _addr;
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return (BITMAP_ENTRY(nr, addr) >> BITMAP_SHIFT(nr)) & 1;
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}
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static inline void clear_bit(unsigned long nr, void *_addr)
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{
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char *addr = _addr;
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BITMAP_ENTRY(nr, addr) &= ~(1UL << BITMAP_SHIFT(nr));
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}
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static inline void set_bit(unsigned long nr, void *_addr)
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{
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char *addr = _addr;
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BITMAP_ENTRY(nr, addr) |= (1UL << BITMAP_SHIFT(nr));
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}
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static inline int test_and_clear_bit(unsigned long nr, void *addr)
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{
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int oldbit = test_bit(nr, addr);
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clear_bit(nr, addr);
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return oldbit;
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}
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static inline int test_and_set_bit(unsigned long nr, void *addr)
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{
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int oldbit = test_bit(nr, addr);
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set_bit(nr, addr);
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return oldbit;
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}
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static inline void bitmap_or(void *_dst, const void *_other,
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unsigned long nr_bits)
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{
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char *dst = _dst;
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const char *other = _other;
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unsigned long i;
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for ( i = 0; i < bitmap_size(nr_bits); ++i )
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dst[i] |= other[i];
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}
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#endif /* XC_BITOPS_H */
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