diff options
author | alc <alc@FreeBSD.org> | 2003-11-16 06:11:26 +0000 |
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committer | alc <alc@FreeBSD.org> | 2003-11-16 06:11:26 +0000 |
commit | 74614e7f63a3fda41bd634356405cc328a9e2284 (patch) | |
tree | b69ee615792b94ee1abcb1231c0534c04003fef9 /sys/amd64/include/sf_buf.h | |
parent | a26ad70ac9b89e66563dd0bcc539d7bf9a9c2757 (diff) | |
download | FreeBSD-src-74614e7f63a3fda41bd634356405cc328a9e2284.zip FreeBSD-src-74614e7f63a3fda41bd634356405cc328a9e2284.tar.gz |
- Modify alpha's sf_buf implementation to use the direct virtual-to-
physical mapping.
- Move the sf_buf API to its own header file; make struct sf_buf's
definition machine dependent. In this commit, we remove an
unnecessary field from struct sf_buf on the alpha, amd64, and ia64.
Ultimately, we may eliminate struct sf_buf on those architecures
except as an opaque pointer that references a vm page.
Diffstat (limited to 'sys/amd64/include/sf_buf.h')
-rw-r--r-- | sys/amd64/include/sf_buf.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/sys/amd64/include/sf_buf.h b/sys/amd64/include/sf_buf.h new file mode 100644 index 0000000..7fd1a64 --- /dev/null +++ b/sys/amd64/include/sf_buf.h @@ -0,0 +1,57 @@ +/*- + * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _MACHINE_SF_BUF_H_ +#define _MACHINE_SF_BUF_H_ + +#include <sys/queue.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/vm_page.h> + +struct sf_buf { + SLIST_ENTRY(sf_buf) free_list; /* list of free buffer slots */ + vm_page_t m; /* currently mapped page */ +}; + +static __inline vm_offset_t +sf_buf_kva(struct sf_buf *sf) +{ + + return (PHYS_TO_DMAP(sf->m->phys_addr)); +} + +static __inline vm_page_t +sf_buf_page(struct sf_buf *sf) +{ + + return (sf->m); +} + +#endif /* !_MACHINE_SF_BUF_H_ */ |