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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
4 * Author: Christoffer Dall <c.dall@virtualopensystems.com>
5 */
6
7#include <linux/linkage.h>
8
9 .text
10
11/********************************************************************
12 * Call function in Hyp mode
13 *
14 *
15 * unsigned long kvm_call_hyp(void *hypfn, ...);
16 *
17 * This is not really a variadic function in the classic C-way and care must
18 * be taken when calling this to ensure parameters are passed in registers
19 * only, since the stack will change between the caller and the callee.
20 *
21 * Call the function with the first argument containing a pointer to the
22 * function you wish to call in Hyp mode, and subsequent arguments will be
23 * passed as r0, r1, and r2 (a maximum of 3 arguments in addition to the
24 * function pointer can be passed). The function being called must be mapped
25 * in Hyp mode (see init_hyp_mode in arch/arm/kvm/arm.c). Return values are
26 * passed in r0 (strictly 32bit).
27 *
28 * The calling convention follows the standard AAPCS:
29 * r0 - r3: caller save
30 * r12: caller save
31 * rest: callee save
32 */
33ENTRY(__kvm_call_hyp)
34 hvc #0
35 bx lr
36ENDPROC(__kvm_call_hyp)