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https://github.com/xen-project/xen.git
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Andrew Cooper
11d0044a16
The type of the pointer to a bitmap is not interesting; it does not affect the representation of the block of bits being pointed to. Make the libxc functions consistent with those in Xen, so they can work just as well with 'unsigned int *' based bitmaps. As part of doing so, change the implementation to be in terms of char rather than unsigned long. This fixes alignment concerns with ARM. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Wei Liu <wei.liu2@citrix.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
80 lines
1.8 KiB
C
80 lines
1.8 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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/* Needed by several includees, but no longer used for bitops. */
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#define BITS_PER_LONG (sizeof(unsigned long) * 8)
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#define ORDER_LONG (sizeof(unsigned long) == 4 ? 5 : 6)
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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 longs needed to hold nr_bits */
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static inline int bitmap_size(int 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(int nr_bits)
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{
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return calloc(1, bitmap_size(nr_bits));
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}
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static inline void bitmap_set(void *addr, int 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, int 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(int 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(int 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(int 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(int 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(int 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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int 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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int 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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