freebsd-src/usr.sbin/bhyve/fwctl.h
Peter Grehan 88ac695858 Simple sysctl-like firmware query interface. Similar in operation
to the qemu one, and uses the same i/o ports but with different
messaging. Requires the 'bootrom' option to be enabled.

This is used by UEFI (and potentially other BIOSs/firmware) to
request information from bhyve. Currently, only the number of
vCPUs is made available, with more to follow.

A very large thankyou to Ben Perrault who helped out testing
an earlier version of this, and bhyve/Windows in general.

Reviewed by:	tychon
Discussed with:	neel
Sponsored by:	Nahanni Systems
2015-10-02 21:09:49 +00:00

55 lines
1.8 KiB
C

/*-
* Copyright (c) 2015 Peter Grehan <grehan@freebsd.org>
* 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 ``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 _FWCTL_H_
#define _FWCTL_H_
#include <sys/linker_set.h>
/*
* Linker set api for export of information to guest firmware via
* a sysctl-like OID interface
*/
struct ctl {
const char *c_oid;
const void *c_data;
const int c_len;
};
#define CTL_NODE(oid, data, len) \
static struct ctl __CONCAT(__ctl, __LINE__) = { \
oid, \
(data), \
(len), \
}; \
DATA_SET(ctl_set, __CONCAT(__ctl, __LINE__))
void fwctl_init(void);
#endif /* _FWCTL_H_ */