4 /* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <linuxlist.h>
26 struct llist_head list;
28 /* the layer 1 header, if any */
30 /* the A-bis layer 2 header: OML, RSL(RLL), NS */
32 /* the layer 3 header. For OML: FOM; RSL: 04.08; GPRS: BSSGP */
38 unsigned char *head; /* start of buffer */
39 unsigned char *tail; /* end of message */
40 unsigned char *data; /* start of message */
41 unsigned char _data[0];
44 extern struct msgb *msgb_alloc(uint16_t size, const char *name);
45 extern void msgb_free(struct msgb *m);
46 extern void msgb_enqueue(struct llist_head *queue, struct msgb *msg);
47 extern struct msgb *msgb_dequeue(struct llist_head *queue);
48 extern void msgb_reset(struct msgb *m);
50 #define msgb_l1(m) ((void *)(m->l1h))
51 #define msgb_l2(m) ((void *)(m->l2h))
52 #define msgb_l3(m) ((void *)(m->l3h))
54 static inline unsigned int msgb_l1len(const struct msgb *msgb)
56 return msgb->tail - (uint8_t *)msgb_l1(msgb);
59 static inline unsigned int msgb_l2len(const struct msgb *msgb)
61 return msgb->tail - (uint8_t *)msgb_l2(msgb);
64 static inline unsigned int msgb_l3len(const struct msgb *msgb)
66 return msgb->tail - (uint8_t *)msgb_l3(msgb);
69 static inline unsigned int msgb_headlen(const struct msgb *msgb)
71 return msgb->len - msgb->data_len;
73 static inline int msgb_tailroom(const struct msgb *msgb)
75 return (msgb->head + msgb->data_len) - msgb->tail;
77 static inline unsigned char *msgb_put(struct msgb *msgb, unsigned int len)
79 unsigned char *tmp = msgb->tail;
81 /* we intentionally call cons_puts() here to display an allocation
82 * failure on the _other_ serial port (i.e. the one that doesn't
83 * have the HDLC layer on it */
84 if (msgb_tailroom(msgb) < len)
85 cons_puts("msgb_tailroom insufficient!\n");
91 static inline void msgb_put_u8(struct msgb *msgb, uint8_t word)
93 uint8_t *space = msgb_put(msgb, 1);
94 space[0] = word & 0xFF;
96 static inline void msgb_put_u16(struct msgb *msgb, uint16_t word)
98 uint8_t *space = msgb_put(msgb, 2);
99 space[0] = word >> 8 & 0xFF;
100 space[1] = word & 0xFF;
102 static inline void msgb_put_u32(struct msgb *msgb, uint32_t word)
104 uint8_t *space = msgb_put(msgb, 4);
105 space[0] = word >> 24 & 0xFF;
106 space[1] = word >> 16 & 0xFF;
107 space[2] = word >> 8 & 0xFF;
108 space[3] = word & 0xFF;
110 static inline unsigned char *msgb_get(struct msgb *msgb, unsigned int len)
112 unsigned char *tmp = msgb->data;
117 static inline uint8_t msgb_get_u8(struct msgb *msgb)
119 uint8_t *space = msgb_get(msgb, 1);
122 static inline uint16_t msgb_get_u16(struct msgb *msgb)
124 uint8_t *space = msgb_get(msgb, 2);
125 return space[0] << 8 | space[1];
127 static inline uint32_t msgb_get_u32(struct msgb *msgb)
129 uint8_t *space = msgb_get(msgb, 4);
130 return space[0] << 24 | space[1] << 16 | space[2] << 8 | space[3];
132 static inline unsigned char *msgb_push(struct msgb *msgb, unsigned int len)
138 static inline unsigned char *msgb_pull(struct msgb *msgb, unsigned int len)
141 return msgb->data += len;
144 /* increase the headroom of an empty msgb, reducing the tailroom */
145 static inline void msgb_reserve(struct msgb *msg, int len)
151 static inline struct msgb *msgb_alloc_headroom(int size, int headroom,
154 struct msgb *msg = msgb_alloc(size, name);
156 msgb_reserve(msg, headroom);