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gsm_08_58.h: Introduce struct abis_rsl_chan_nr 

It will allow to make code handling chan_nr values more easier to read
and less prone to errors.
union is used to be able to get the full octet in
case we need to pass it somewhere else or encode it.

An extra union is used in struct abis_rsl_common_hdr and others to allow
using fields directly while keeping API compatibility.

Change-Id: Icd6822021207270a00106c50f8ca6b93c1250df9
This commit is contained in:
Pau Espin 2018-10-10 20:41:40 +02:00 committed by Harald Welte
parent 2e0a945d3d
commit fb97e72e52
1 changed files with 32 additions and 3 deletions
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35
include/osmocom/gsm/protocol/gsm_08_58.h
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@ -31,6 +31,26 @@
* @{
* \file gsm_08_58.h */
/* Channel Number 9.3.1 */
union abis_rsl_chan_nr {
#if OSMO_IS_BIG_ENDIAN
uint8_t cbits:5,
tn:3;
#elif OSMO_IS_LITTLE_ENDIAN
uint8_t tn:3,
cbits:5;
#endif
uint8_t chan_nr;
} __attribute__ ((packed));
#define ABIS_RSL_CHAN_NR_CBITS_Bm_ACCHs 0x01
#define ABIS_RSL_CHAN_NR_CBITS_Lm_ACCHs(ss) (0x02 + (ss))
#define ABIS_RSL_CHAN_NR_CBITS_SDCCH4_ACCH(ss) (0x04 + (ss))
#define ABIS_RSL_CHAN_NR_CBITS_SDCCH8_ACCH(ss) (0x08 + (ss))
#define ABIS_RSL_CHAN_NR_CBITS_BCCH 0x10
#define ABIS_RSL_CHAN_NR_CBITS_RACH 0x11
#define ABIS_RSL_CHAN_NR_CBITS_PCH_AGCH 0x12
#define ABIS_RSL_CHAN_NR_CBITS_OSMO_PDCH 0x18 /*< non-standard, for dyn TS */
/* Link Identifier 9.3.2 */
union abis_rsl_link_id {
#if OSMO_IS_BIG_ENDIAN
@ -60,7 +80,10 @@ struct abis_rsl_common_hdr {
struct abis_rsl_rll_hdr {
struct abis_rsl_common_hdr c;
uint8_t ie_chan; /*!< \ref RSL_IE_CHAN_NR (tag) */
uint8_t chan_nr; /*!< RSL channel number (value) */
union {
uint8_t chan_nr; /* API backward compat */
union abis_rsl_chan_nr chan_nr_fields; /*!< RSL channel number (value) */
};
uint8_t ie_link_id; /*!< \ref RSL_IE_LINK_IDENT (tag) */
union {
uint8_t link_id; /* API backward compat */
@ -73,7 +96,10 @@ struct abis_rsl_rll_hdr {
struct abis_rsl_dchan_hdr {
struct abis_rsl_common_hdr c;
uint8_t ie_chan; /*!< \ref RSL_IE_CHAN_NR (tag) */
uint8_t chan_nr; /*!< RSL channel number (value) */
union {
uint8_t chan_nr; /* API backward compat */
union abis_rsl_chan_nr chan_nr_fields; /*!< RSL channel number (value) */
};
uint8_t data[0]; /*!< message payload data */
} __attribute__ ((packed));
@ -81,7 +107,10 @@ struct abis_rsl_dchan_hdr {
struct abis_rsl_cchan_hdr {
struct abis_rsl_common_hdr c;
uint8_t ie_chan; /*!< \ref RSL_IE_CHAN_NR (tag) */
uint8_t chan_nr; /*!< RSL channel number (value) */
union {
uint8_t chan_nr; /* API backward compat */
union abis_rsl_chan_nr chan_nr_fields; /*!< RSL channel number (value) */
};
uint8_t data[0]; /*!< message payload data */
} __attribute__ ((packed));