/*
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* Copyright (C) 2001,2002,2003 Philippe Gerum.
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*
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* Xenomai is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation, Inc., 675 Mass Ave, Cambridge MA
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* 02139, USA; either version 2 of the License, or (at your option)
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* any later version.
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*
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* Xenomai is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _COBALT_KERNEL_PIPE_H
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#define _COBALT_KERNEL_PIPE_H
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#include <linux/types.h>
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#include <linux/poll.h>
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#include <cobalt/kernel/synch.h>
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#include <cobalt/kernel/thread.h>
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#include <cobalt/uapi/kernel/pipe.h>
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#define XNPIPE_NDEVS CONFIG_XENO_OPT_PIPE_NRDEV
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#define XNPIPE_DEV_MAJOR 150
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#define XNPIPE_KERN_CONN 0x1
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#define XNPIPE_KERN_LCLOSE 0x2
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#define XNPIPE_USER_CONN 0x4
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#define XNPIPE_USER_SIGIO 0x8
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#define XNPIPE_USER_WREAD 0x10
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#define XNPIPE_USER_WREAD_READY 0x20
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#define XNPIPE_USER_WSYNC 0x40
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#define XNPIPE_USER_WSYNC_READY 0x80
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#define XNPIPE_USER_LCONN 0x100
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#define XNPIPE_USER_ALL_WAIT \
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(XNPIPE_USER_WREAD|XNPIPE_USER_WSYNC)
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#define XNPIPE_USER_ALL_READY \
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(XNPIPE_USER_WREAD_READY|XNPIPE_USER_WSYNC_READY)
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struct xnpipe_mh {
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size_t size;
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size_t rdoff;
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struct list_head link;
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};
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struct xnpipe_state;
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struct xnpipe_operations {
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void (*output)(struct xnpipe_mh *mh, void *xstate);
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int (*input)(struct xnpipe_mh *mh, int retval, void *xstate);
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void *(*alloc_ibuf)(size_t size, void *xstate);
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void (*free_ibuf)(void *buf, void *xstate);
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void (*free_obuf)(void *buf, void *xstate);
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void (*release)(void *xstate);
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};
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struct xnpipe_state {
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struct list_head slink; /* Link on sleep queue */
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struct list_head alink; /* Link on async queue */
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struct list_head inq; /* From user-space to kernel */
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int nrinq;
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struct list_head outq; /* From kernel to user-space */
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int nroutq;
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struct xnsynch synchbase;
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struct xnpipe_operations ops;
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void *xstate; /* Extra state managed by caller */
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/* Linux kernel part */
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unsigned long status;
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struct fasync_struct *asyncq;
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wait_queue_head_t readq; /* open/read/poll waiters */
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wait_queue_head_t syncq; /* sync waiters */
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int wcount; /* number of waiters on this minor */
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size_t ionrd;
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};
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extern struct xnpipe_state xnpipe_states[];
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#define xnminor_from_state(s) (s - xnpipe_states)
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#ifdef CONFIG_XENO_OPT_PIPE
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int xnpipe_mount(void);
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void xnpipe_umount(void);
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#else /* !CONFIG_XENO_OPT_PIPE */
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static inline int xnpipe_mount(void) { return 0; }
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static inline void xnpipe_umount(void) { }
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#endif /* !CONFIG_XENO_OPT_PIPE */
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/* Entry points of the kernel interface. */
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int xnpipe_connect(int minor,
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struct xnpipe_operations *ops, void *xstate);
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int xnpipe_disconnect(int minor);
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ssize_t xnpipe_send(int minor,
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struct xnpipe_mh *mh, size_t size, int flags);
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ssize_t xnpipe_mfixup(int minor, struct xnpipe_mh *mh, ssize_t size);
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ssize_t xnpipe_recv(int minor,
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struct xnpipe_mh **pmh, xnticks_t timeout);
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int xnpipe_flush(int minor, int mode);
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int xnpipe_pollstate(int minor, unsigned int *mask_r);
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static inline unsigned int __xnpipe_pollstate(int minor)
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{
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struct xnpipe_state *state = xnpipe_states + minor;
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unsigned int mask = POLLOUT;
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if (!list_empty(&state->inq))
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mask |= POLLIN;
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return mask;
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}
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static inline char *xnpipe_m_data(struct xnpipe_mh *mh)
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{
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return (char *)(mh + 1);
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}
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#define xnpipe_m_size(mh) ((mh)->size)
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#define xnpipe_m_rdoff(mh) ((mh)->rdoff)
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#endif /* !_COBALT_KERNEL_PIPE_H */
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