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https://github.com/xen-project/xen.git
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Olaf Hering
50a5215f30
If the bitmap is used to represent domU pages, the amount of memory is limited to 8TB due to the 32bit value. Adjust the code to use 64bit values as input. All callers already use some form of 64bit as input, so no further adjustment is required. Signed-off-by: Olaf Hering <olaf@aepfle.de> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Wei Liu <wl@xen.org>
80 lines
1.9 KiB
C
80 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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/* 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 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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return calloc(1, bitmap_size(nr_bits));
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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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