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
34 static inline void hv_set_msr(unsigned int reg, u64 value)
35 {
36 hv_set_vpreg(reg, value);
37 }
38
39 static 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
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