1/* SPDX-License-Identifier: GPL-2.0 */
2
3/*
4 * Linux-specific definitions for managing interactions with Microsoft's
5 * Hyper-V hypervisor. The definitions in this file are specific to
6 * the ARM64 architecture.  See include/asm-generic/mshyperv.h for
7 * definitions are that architecture independent.
8 *
9 * Definitions that are specified in the Hyper-V Top Level Functional
10 * Spec (TLFS) should not go in this file, but should instead go in
11 * hyperv-tlfs.h.
12 *
13 * Copyright (C) 2021, Microsoft, Inc.
14 *
15 * Author : Michael Kelley <mikelley@microsoft.com>
16 */
17
18#ifndef _ASM_MSHYPERV_H
19#define _ASM_MSHYPERV_H
20
21#include <linux/types.h>
22#include <linux/arm-smccc.h>
23#include <asm/hyperv-tlfs.h>
24
25/*
26 * Declare calls to get and set Hyper-V VP register values on ARM64, which
27 * requires a hypercall.
28 */
29
30void hv_set_vpreg(u32 reg, u64 value);
31u64 hv_get_vpreg(u32 reg);
32void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
33
34static inline void hv_set_msr(unsigned int reg, u64 value)
35{
36	hv_set_vpreg(reg, value);
37}
38
39static inline u64 hv_get_msr(unsigned int reg)
40{
41	return hv_get_vpreg(reg);
42}
43
44/* SMCCC hypercall parameters */
45#define HV_SMCCC_FUNC_NUMBER	1
46#define HV_FUNC_ID	ARM_SMCCC_CALL_VAL(			\
47				ARM_SMCCC_STD_CALL,		\
48				ARM_SMCCC_SMC_64,		\
49				ARM_SMCCC_OWNER_VENDOR_HYP,	\
50				HV_SMCCC_FUNC_NUMBER)
51
52#include <asm-generic/mshyperv.h>
53
54#endif
55