157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*-
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* Copyright (c) 2012 EMC Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_MEMDESC_H_
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#define _SYS_MEMDESC_H_
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struct bio;
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struct bus_dma_segment;
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struct uio;
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struct mbuf;
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union ccb;
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/*
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* struct memdesc encapsulates various memory descriptors and provides
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* abstract access to them.
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*/
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struct memdesc {
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union {
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void *md_vaddr;
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vm_paddr_t md_paddr;
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struct bus_dma_segment *md_list;
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struct bio *md_bio;
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struct uio *md_uio;
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struct mbuf *md_mbuf;
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union ccb *md_ccb;
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} u;
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size_t md_opaque; /* type specific data. */
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uint32_t md_type; /* Type of memory. */
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};
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#define MEMDESC_VADDR 1 /* Contiguous virtual address. */
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#define MEMDESC_PADDR 2 /* Contiguous physical address. */
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#define MEMDESC_VLIST 3 /* scatter/gather list of kva addresses. */
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#define MEMDESC_PLIST 4 /* scatter/gather list of physical addresses. */
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#define MEMDESC_BIO 5 /* Pointer to a bio (block io). */
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#define MEMDESC_UIO 6 /* Pointer to a uio (any io). */
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#define MEMDESC_MBUF 7 /* Pointer to a mbuf (network io). */
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#define MEMDESC_CCB 8 /* Cam control block. (scsi/ata io). */
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static inline struct memdesc
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memdesc_vaddr(void *vaddr, size_t len)
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{
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struct memdesc mem;
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mem.u.md_vaddr = vaddr;
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mem.md_opaque = len;
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mem.md_type = MEMDESC_VADDR;
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return (mem);
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}
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static inline struct memdesc
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memdesc_paddr(vm_paddr_t paddr, size_t len)
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{
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struct memdesc mem;
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mem.u.md_paddr = paddr;
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mem.md_opaque = len;
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mem.md_type = MEMDESC_PADDR;
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return (mem);
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}
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static inline struct memdesc
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memdesc_vlist(struct bus_dma_segment *vlist, int sglist_cnt)
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{
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struct memdesc mem;
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mem.u.md_list = vlist;
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mem.md_opaque = sglist_cnt;
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mem.md_type = MEMDESC_VLIST;
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return (mem);
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}
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static inline struct memdesc
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memdesc_plist(struct bus_dma_segment *plist, int sglist_cnt)
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{
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struct memdesc mem;
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mem.u.md_list = plist;
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mem.md_opaque = sglist_cnt;
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mem.md_type = MEMDESC_PLIST;
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return (mem);
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}
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static inline struct memdesc
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memdesc_bio(struct bio *bio)
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{
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struct memdesc mem;
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mem.u.md_bio = bio;
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mem.md_type = MEMDESC_BIO;
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return (mem);
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}
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static inline struct memdesc
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memdesc_uio(struct uio *uio)
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{
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struct memdesc mem;
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mem.u.md_uio = uio;
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mem.md_type = MEMDESC_UIO;
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return (mem);
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}
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static inline struct memdesc
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memdesc_mbuf(struct mbuf *mbuf)
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{
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struct memdesc mem;
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mem.u.md_mbuf = mbuf;
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mem.md_type = MEMDESC_MBUF;
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return (mem);
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}
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static inline struct memdesc
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memdesc_ccb(union ccb *ccb)
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{
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struct memdesc mem;
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mem.u.md_ccb = ccb;
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mem.md_type = MEMDESC_CCB;
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return (mem);
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}
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#endif /* _SYS_MEMDESC_H_ */
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