mirror of
https://github.com/xen-project/xen.git
synced 2026-10-28 02:01:24 +01:00
Juergen Gross
af6c78d9dc
Today tools/libxc needs to be built after tools/libs as libxenctrl is depending on some libraries in tools/libs. This in turn blocks moving other libraries depending on libxenctrl below tools/libs. So carve out libxenctrl from tools/libxc and move it into tools/libs/ctrl. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org> (stubdom parts) Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> (python parts) Acked-by: Wei Liu <wl@xen.org>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
#ifndef XC_BITOPS_H
|
|
#define XC_BITOPS_H 1
|
|
|
|
/* bitmap operations for single threaded access */
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/* Needed by several includees, but no longer used for bitops. */
|
|
#define BITS_PER_LONG (sizeof(unsigned long) * 8)
|
|
#define ORDER_LONG (sizeof(unsigned long) == 4 ? 5 : 6)
|
|
|
|
#define BITMAP_ENTRY(_nr,_bmap) ((_bmap))[(_nr) / 8]
|
|
#define BITMAP_SHIFT(_nr) ((_nr) % 8)
|
|
|
|
/* calculate required space for number of bytes needed to hold nr_bits */
|
|
static inline int bitmap_size(int nr_bits)
|
|
{
|
|
return (nr_bits + 7) / 8;
|
|
}
|
|
|
|
static inline void *bitmap_alloc(int nr_bits)
|
|
{
|
|
return calloc(1, bitmap_size(nr_bits));
|
|
}
|
|
|
|
static inline void bitmap_set(void *addr, int nr_bits)
|
|
{
|
|
memset(addr, 0xff, bitmap_size(nr_bits));
|
|
}
|
|
|
|
static inline void bitmap_clear(void *addr, int nr_bits)
|
|
{
|
|
memset(addr, 0, bitmap_size(nr_bits));
|
|
}
|
|
|
|
static inline int test_bit(int nr, const void *_addr)
|
|
{
|
|
const char *addr = _addr;
|
|
return (BITMAP_ENTRY(nr, addr) >> BITMAP_SHIFT(nr)) & 1;
|
|
}
|
|
|
|
static inline void clear_bit(int nr, void *_addr)
|
|
{
|
|
char *addr = _addr;
|
|
BITMAP_ENTRY(nr, addr) &= ~(1UL << BITMAP_SHIFT(nr));
|
|
}
|
|
|
|
static inline void set_bit(int nr, void *_addr)
|
|
{
|
|
char *addr = _addr;
|
|
BITMAP_ENTRY(nr, addr) |= (1UL << BITMAP_SHIFT(nr));
|
|
}
|
|
|
|
static inline int test_and_clear_bit(int nr, void *addr)
|
|
{
|
|
int oldbit = test_bit(nr, addr);
|
|
clear_bit(nr, addr);
|
|
return oldbit;
|
|
}
|
|
|
|
static inline int test_and_set_bit(int nr, void *addr)
|
|
{
|
|
int oldbit = test_bit(nr, addr);
|
|
set_bit(nr, addr);
|
|
return oldbit;
|
|
}
|
|
|
|
static inline void bitmap_or(void *_dst, const void *_other,
|
|
int nr_bits)
|
|
{
|
|
char *dst = _dst;
|
|
const char *other = _other;
|
|
int i;
|
|
for ( i = 0; i < bitmap_size(nr_bits); ++i )
|
|
dst[i] |= other[i];
|
|
}
|
|
|
|
#endif /* XC_BITOPS_H */
|