a8f6ac0573
Move FreeBSD from interface version 0x00030204 to 0x00030208. Updates are required to our grant table implementation before we can bump this further. sys/xen/hvm.h: Replace the implementation of hvm_get_parameter(), formerly located in sys/xen/interface/hvm/params.h. Linux has a similar file which primarily stores this function. sys/xen/xenstore/xenstore.c: Include new xen/hvm.h header file to get hvm_get_parameter(). sys/amd64/include/xen/xen-os.h: sys/i386/include/xen/xen-os.h: Correctly protect function definition and variables from being included into assembly files in xen-os.h Xen memory barriers are now prefixed with "xen_" to avoid conflicts with OS native primatives. Define Xen memory barriers in terms of the native FreeBSD primatives. Sponsored by: Spectra Logic Corporation Reviewed by: Roger Pau Monné Tested by: Roger Pau Monné Obtained from: Roger Pau Monné (bug fixes)
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/**
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* @file
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* @section AUTHORS
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*
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* Copyright (C) 2010 Rafal Wojtczuk <rafal@invisiblethingslab.com>
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*
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* Authors:
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* Rafal Wojtczuk <rafal@invisiblethingslab.com>
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* Daniel De Graaf <dgdegra@tycho.nsa.gov>
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*
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* @section LICENSE
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* @section DESCRIPTION
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*
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* Originally borrowed from the Qubes OS Project, http://www.qubes-os.org,
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* this code has been substantially rewritten to use the gntdev and gntalloc
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* devices instead of raw MFNs and map_foreign_range.
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*
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* This is a library for inter-domain communication. A standard Xen ring
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* buffer is used, with a datagram-based interface built on top. The grant
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* reference and event channels are shared in XenStore under a user-specified
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* path.
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*
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* The ring.h macros define an asymmetric interface to a shared data structure
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* that assumes all rings reside in a single contiguous memory space. This is
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* not suitable for vchan because the interface to the ring is symmetric except
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* for the setup. Unlike the producer-consumer rings defined in ring.h, the
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* size of the rings used in vchan are determined at execution time instead of
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* compile time, so the macros in ring.h cannot be used to access the rings.
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*/
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#include <stdint.h>
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#include <sys/types.h>
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struct ring_shared {
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uint32_t cons, prod;
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};
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#define VCHAN_NOTIFY_WRITE 0x1
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#define VCHAN_NOTIFY_READ 0x2
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/**
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* vchan_interface: primary shared data structure
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*/
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struct vchan_interface {
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/**
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* Standard consumer/producer interface, one pair per buffer
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* left is client write, server read
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* right is client read, server write
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*/
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struct ring_shared left, right;
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/**
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* size of the rings, which determines their location
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* 10 - at offset 1024 in ring's page
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* 11 - at offset 2048 in ring's page
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* 12+ - uses 2^(N-12) grants to describe the multi-page ring
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* These should remain constant once the page is shared.
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* Only one of the two orders can be 10 (or 11).
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*/
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uint16_t left_order, right_order;
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/**
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* Shutdown detection:
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* 0: client (or server) has exited
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* 1: client (or server) is connected
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* 2: client has not yet connected
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*/
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uint8_t cli_live, srv_live;
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/**
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* Notification bits:
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* VCHAN_NOTIFY_WRITE: send notify when data is written
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* VCHAN_NOTIFY_READ: send notify when data is read (consumed)
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* cli_notify is used for the client to inform the server of its action
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*/
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uint8_t cli_notify, srv_notify;
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/**
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* Grant list: ordering is left, right. Must not extend into actual ring
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* or grow beyond the end of the initial shared page.
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* These should remain constant once the page is shared, to allow
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* for possible remapping by a client that restarts.
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*/
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uint32_t grants[0];
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};
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