1 /*- SPDX-License-Identifier: BSD-2-Clause
2 *
3 * Copyright (c) 2016-2017,2022 Microsoft Corp.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 #include <dev/hyperv/include/hyperv.h>
29 #include <dev/hyperv/include/hyperv_busdma.h>
30 #include <dev/hyperv/vmbus/aarch64/hyperv_machdep.h>
31 #include <dev/hyperv/vmbus/aarch64/hyperv_reg.h>
32 #include <dev/hyperv/vmbus/hyperv_var.h>
33 #include <dev/hyperv/vmbus/hyperv_common_reg.h>
34 #include <dev/psci/smccc.h>
35
36 #define HVCALL_SET_VP_REGISTERS 0x0051
37 #define HVCALL_GET_VP_REGISTERS 0x0050
38 #define BIT(A) (1 << (A))
39 #define HV_HYPERCALL_FAST_BIT BIT(16)
40 #define BIT_ULL(a) (1ULL << (a))
41 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32)
42 #define HV_PARTITION_ID_SELF ((u64)-1)
43 #define HV_VP_INDEX_SELF ((u32)-2)
44 #define HV_SMCCC_FUNC_NUMBER 1
45
46 #define HV_FUNC_ID \
47 SMCCC_FUNC_ID(SMCCC_YIELDING_CALL, SMCCC_64BIT_CALL, \
48 SMCCC_VENDOR_HYP_SERVICE_CALLS, HV_SMCCC_FUNC_NUMBER)
49
50 void
arm_hv_set_vreg(u32 msr,u64 value)51 arm_hv_set_vreg(u32 msr, u64 value)
52 {
53 arm_smccc_hvc(HV_FUNC_ID,
54 HVCALL_SET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT |
55 HV_HYPERCALL_REP_COMP_1,
56 HV_PARTITION_ID_SELF, HV_VP_INDEX_SELF, msr, 0, value, 0, NULL);
57 }
58
59 void
hv_get_vpreg_128(u32 msr,struct hv_get_vp_registers_output * result)60 hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *result)
61 {
62 struct arm_smccc_1_2_regs args;
63 struct arm_smccc_1_2_regs res;
64
65 args.a0 = HV_FUNC_ID;
66 args.a1 = HVCALL_GET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT |
67 HV_HYPERCALL_REP_COMP_1;
68 args.a2 = HV_PARTITION_ID_SELF;
69 args.a3 = HV_VP_INDEX_SELF;
70 args.a4 = msr;
71
72 /*
73 * Use the SMCCC 1.2 interface because the results are in registers
74 * beyond X0-X3.
75 */
76 arm_smccc_1_2_hvc(&args, &res);
77
78 result->as64.low = res.a6;
79 result->as64.high = res.a7;
80 }
81
82 u64
arm_hv_get_vreg(u32 msr)83 arm_hv_get_vreg(u32 msr)
84 {
85 struct hv_get_vp_registers_output output;
86
87 hv_get_vpreg_128(msr, &output);
88
89 return (output.as64.low);
90 }
91
92 uint64_t
hypercall_md(volatile void * hc_addr,uint64_t in_val,uint64_t in_paddr,uint64_t out_paddr)93 hypercall_md(volatile void *hc_addr, uint64_t in_val, uint64_t in_paddr,
94 uint64_t out_paddr)
95 {
96 struct arm_smccc_res res;
97
98 arm_smccc_hvc(HV_FUNC_ID, in_val, in_paddr, out_paddr, 0, 0, 0, 0,
99 &res);
100
101 return (res.a0);
102 }
103