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/*
* Copyright (c) 2020 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef included_clib_interrupt_h
#define included_clib_interrupt_h
#include <vppinfra/clib.h>
#include <vppinfra/bitops.h> /* for count_set_bits */
#include <vppinfra/vec.h>
typedef struct
{
CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
int n_int;
uword n_uword_alloc;
} clib_interrupt_header_t;
void clib_interrupt_init (void **data, uword n_interrupts);
void clib_interrupt_resize (void **data, uword n_interrupts);
static_always_inline void
clib_interrupt_free (void **data)
{
if (data[0])
{
clib_mem_free (data[0]);
data[0] = 0;
}
}
static_always_inline int
clib_interrupt_get_n_int (void *d)
{
clib_interrupt_header_t *h = d;
if (h)
return h->n_int;
return 0;
}
static_always_inline uword *
clib_interrupt_get_bitmap (void *d)
{
return d + sizeof (clib_interrupt_header_t);
}
static_always_inline uword *
clib_interrupt_get_atomic_bitmap (void *d)
{
clib_interrupt_header_t *h = d;
return clib_interrupt_get_bitmap (d) + h->n_uword_alloc;
}
static_always_inline void
clib_interrupt_set (void *in, int int_num)
{
uword *bmp = clib_interrupt_get_bitmap (in);
uword mask = 1ULL << (int_num & (uword_bits - 1));
bmp += int_num >> log2_uword_bits;
ASSERT (int_num < ((clib_interrupt_header_t *) in)->n_int);
*bmp |= mask;
}
static_always_inline void
clib_interrupt_set_atomic (void *in, int int_num)
{
uword *bmp = clib_interrupt_get_atomic_bitmap (in);
uword mask = 1ULL << (int_num & (uword_bits - 1));
bmp += int_num >> log2_uword_bits;
ASSERT (int_num < ((clib_interrupt_header_t *) in)->n_int);
__atomic_fetch_or (bmp, mask, __ATOMIC_RELAXED);
}
static_always_inline void
clib_interrupt_clear (void *in, int int_num)
{
uword *bmp = clib_interrupt_get_bitmap (in);
uword *abm = clib_interrupt_get_atomic_bitmap (in);
uword mask = 1ULL << (int_num & (uword_bits - 1));
uword off = int_num >> log2_uword_bits;
ASSERT (int_num < ((clib_interrupt_header_t *) in)->n_int);
bmp[off] |= __atomic_exchange_n (abm + off, 0, __ATOMIC_SEQ_CST);
bmp[off] &= ~mask;
}
static_always_inline int
clib_interrupt_get_next (void *in, int last)
{
uword *bmp = clib_interrupt_get_bitmap (in);
uword *abm = clib_interrupt_get_atomic_bitmap (in);
clib_interrupt_header_t *h = in;
uword bmp_uword, off;
ASSERT (last >= -1 && last < h->n_int);
off = (last + 1) >> log2_uword_bits;
last -= off << log2_uword_bits;
bmp[off] |= __atomic_exchange_n (abm + off, 0, __ATOMIC_SEQ_CST);
bmp_uword = bmp[off] & ~pow2_mask (last + 1);
next:
if (bmp_uword)
return (off << log2_uword_bits) + count_trailing_zeros (bmp_uword);
off++;
if (off > h->n_int >> log2_uword_bits)
return -1;
bmp[off] |= __atomic_exchange_n (abm + off, 0, __ATOMIC_SEQ_CST);
bmp_uword = bmp[off];
goto next;
}
#endif /* included_clib_interrupt_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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