int
ddi_soft_state_init(void **state_p, size_t size, size_t n_items)
{
struct i_ddi_soft_state *ss;
if (state_p == NULL || *state_p != NULL || size == 0)
return (EINVAL);
ss = kmem_zalloc(sizeof (*ss), KM_SLEEP);
mutex_init(&ss->lock, NULL, MUTEX_DRIVER, NULL);
ss->size = size;
if (n_items < MIN_N_ITEMS)
ss->n_items = MIN_N_ITEMS;
else {
int bitlog;
if ((bitlog = ddi_fls(n_items)) == ddi_ffs(n_items))
bitlog--;
ss->n_items = 1 << bitlog;
}
ASSERT(ss->n_items >= n_items);
ss->array = kmem_zalloc(ss->n_items * sizeof (void *), KM_SLEEP);
*state_p = ss;
return (0);
}
/* check to see if value is power of 2 or not. */
static int
isnot_pow2(uint64_t value)
{
uint32_t low;
uint32_t hi;
low = value & 0xffffffff;
hi = value >> 32;
/*
* ddi_ffs and ddi_fls gets long values, so in 32bit environment
* won't work correctly for 64bit values
*/
if ((ddi_ffs(low) == ddi_fls(low)) &&
(ddi_ffs(hi) == ddi_fls(hi)))
return (0);
return (1);
}
