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 
30 void hv_set_vpreg(u32 reg, u64 value);
31 u64 hv_get_vpreg(u32 reg);
32 void hv_get_vpreg_128(u32 reg, struct hv_get_vp_registers_output *result);
33 
hv_set_register(unsigned int reg,u64 value)34 static inline void hv_set_register(unsigned int reg, u64 value)
35 {
36 	hv_set_vpreg(reg, value);
37 }
38 
hv_get_register(unsigned int reg)39 static inline u64 hv_get_register(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