Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/pcu_utils.h

95 lines
2.1 KiB

/*
* Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include <osmocom/gsm/gsm_utils.h>
#ifdef __cplusplus
}
#endif
#include <time.h>
#include <stdint.h>
#define FN_UNSET 0xFFFFFFFF
static inline int msecs_to_frames(int msecs) {
return (msecs * (1024 * 1000 / 4615)) / 1024;
}
static inline uint32_t next_fn(uint32_t fn, uint32_t offset)
{
return (fn + offset) % GSM_MAX_FN;
}
static inline void csecs_to_timespec(unsigned csecs, struct timespec *ts) {
ts->tv_sec = csecs / 100;
ts->tv_nsec = (csecs % 100) * 10000000;
}
static inline uint32_t rts_next_fn(uint32_t rts_fn, uint8_t block_nr)
{
uint32_t fn = rts_fn + 4;
if ((block_nr % 3) == 2)
fn++;
fn = fn % GSM_MAX_FN;
return fn;
}
static inline unsigned fn2bn(unsigned fn)
{
return (fn % 52) / 4;
}
static inline bool fn_valid(uint32_t fn)
{
uint32_t f = fn % 13;
return f == 0 || f == 4 || f == 8;
}
static inline unsigned fn_next_block(unsigned fn)
{
unsigned bn = fn2bn(fn) + 1;
fn = fn - (fn % 52);
fn += bn * 4 + bn / 3;
return fn % GSM_MAX_FN;
}
#ifdef __cplusplus
template <typename T>
inline unsigned int pcu_bitcount(T x)
{
unsigned int count = 0;
for (count = 0; x; count += 1)
x &= x - 1;
return count;
}
#endif
static inline uint8_t pcu_lsb(uint8_t x)
{
return x & -x;
}
/* Used to store a C++ class in a llist used by C code */
struct llist_item {
struct llist_head list; /* item used by llist */
void *entry;
};