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https://github.com/xen-project/xen.git
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Roger Pau Monné
2fc98a9587
Do this before adding any more stuff to xg_cpuid_x86.c. The placement in xenctrl.h is wrong, as they are implemented by the xenguest library. Note that xg_cpuid_x86.c needs to include xg_private.h, and in turn also fix xg_private.h to include xc_bitops.h. The bitops definition of BITS_PER_LONG needs to be changed to not be an expression, so that xxhash.h can use it in a preprocessor if directive. As a result also modify xen-cpuid to include xenguest.h. Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Anthony PERARD <anthony.perard@citrix.com>
85 lines
1.9 KiB
C
85 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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#ifdef __LP64__
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#define BITS_PER_LONG 64
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#else
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#define BITS_PER_LONG 32
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#endif
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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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