mirror of https://gitee.com/openkylin/linux.git
48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_X25_ASY_H
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#define _LINUX_X25_ASY_H
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/* X.25 asy configuration. */
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#define SL_NRUNIT 256 /* MAX number of X.25 channels;
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This can be overridden with
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insmod -ox25_asy_maxdev=nnn */
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#define SL_MTU 256
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/* X25 async protocol characters. */
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#define X25_END 0x7E /* indicates end of frame */
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#define X25_ESC 0x7D /* indicates byte stuffing */
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#define X25_ESCAPE(x) ((x)^0x20)
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#define X25_UNESCAPE(x) ((x)^0x20)
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struct x25_asy {
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int magic;
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/* Various fields. */
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spinlock_t lock;
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struct tty_struct *tty; /* ptr to TTY structure */
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struct net_device *dev; /* easy for intr handling */
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/* These are pointers to the malloc()ed frame buffers. */
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unsigned char *rbuff; /* receiver buffer */
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int rcount; /* received chars counter */
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unsigned char *xbuff; /* transmitter buffer */
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unsigned char *xhead; /* pointer to next byte to XMIT */
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int xleft; /* bytes left in XMIT queue */
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int buffsize; /* Max buffers sizes */
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unsigned long flags; /* Flag values/ mode etc */
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#define SLF_INUSE 0 /* Channel in use */
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#define SLF_ESCAPE 1 /* ESC received */
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#define SLF_ERROR 2 /* Parity, etc. error */
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#define SLF_OUTWAIT 4 /* Waiting for output */
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};
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#define X25_ASY_MAGIC 0x5303
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int x25_asy_init(struct net_device *dev);
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#endif /* _LINUX_X25_ASY.H */
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