/*
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* Copyright (C) 2009 Philippe Gerum <rpm@xenomai.org>.
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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; either version 2 of the License,
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* or (at your option) 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 Xenomai; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#ifndef _COBALT_KERNEL_BUFD_H
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#define _COBALT_KERNEL_BUFD_H
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#include <linux/types.h>
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/**
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* @addtogroup cobalt_core_bufd
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*
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* @{
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*/
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struct mm_struct;
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struct xnbufd {
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caddr_t b_ptr; /* src/dst buffer address */
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size_t b_len; /* total length of buffer */
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off_t b_off; /* # of bytes read/written */
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struct mm_struct *b_mm; /* src/dst address space */
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caddr_t b_carry; /* pointer to carry over area */
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char b_buf[64]; /* fast carry over area */
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};
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void xnbufd_map_umem(struct xnbufd *bufd,
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void __user *ptr, size_t len);
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static inline void xnbufd_map_uread(struct xnbufd *bufd,
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const void __user *ptr, size_t len)
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{
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xnbufd_map_umem(bufd, (void __user *)ptr, len);
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}
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static inline void xnbufd_map_uwrite(struct xnbufd *bufd,
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void __user *ptr, size_t len)
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{
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xnbufd_map_umem(bufd, ptr, len);
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}
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ssize_t xnbufd_unmap_uread(struct xnbufd *bufd);
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ssize_t xnbufd_unmap_uwrite(struct xnbufd *bufd);
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void xnbufd_map_kmem(struct xnbufd *bufd,
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void *ptr, size_t len);
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static inline void xnbufd_map_kread(struct xnbufd *bufd,
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const void *ptr, size_t len)
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{
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xnbufd_map_kmem(bufd, (void *)ptr, len);
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}
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static inline void xnbufd_map_kwrite(struct xnbufd *bufd,
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void *ptr, size_t len)
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{
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xnbufd_map_kmem(bufd, ptr, len);
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}
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ssize_t xnbufd_unmap_kread(struct xnbufd *bufd);
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ssize_t xnbufd_unmap_kwrite(struct xnbufd *bufd);
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ssize_t xnbufd_copy_to_kmem(void *ptr,
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struct xnbufd *bufd, size_t len);
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ssize_t xnbufd_copy_from_kmem(struct xnbufd *bufd,
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void *from, size_t len);
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void xnbufd_invalidate(struct xnbufd *bufd);
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static inline void xnbufd_reset(struct xnbufd *bufd)
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{
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bufd->b_off = 0;
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}
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/** @} */
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#endif /* !_COBALT_KERNEL_BUFD_H */
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