1/*
2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
3 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
17 */
18
19#include <linux/linkage.h>
20
21	.text
22
23/********************************************************************
24 *  Call function in Hyp mode
25 *
26 *
27 * unsigned long kvm_call_hyp(void *hypfn, ...);
28 *
29 * This is not really a variadic function in the classic C-way and care must
30 * be taken when calling this to ensure parameters are passed in registers
31 * only, since the stack will change between the caller and the callee.
32 *
33 * Call the function with the first argument containing a pointer to the
34 * function you wish to call in Hyp mode, and subsequent arguments will be
35 * passed as r0, r1, and r2 (a maximum of 3 arguments in addition to the
36 * function pointer can be passed).  The function being called must be mapped
37 * in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c).  Return values are
38 * passed in r0 (strictly 32bit).
39 *
40 * The calling convention follows the standard AAPCS:
41 *   r0 - r3: caller save
42 *   r12:     caller save
43 *   rest:    callee save
44 */
45ENTRY(kvm_call_hyp)
46	hvc	#0
47	bx	lr
48ENDPROC(kvm_call_hyp)
49