1 /*- SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 __FBSDID("$FreeBSD$"); 29 30 #include <dev/hyperv/include/hyperv.h> 31 #include <dev/hyperv/include/hyperv_busdma.h> 32 #include <dev/hyperv/vmbus/aarch64/hyperv_machdep.h> 33 #include <dev/hyperv/vmbus/aarch64/hyperv_reg.h> 34 #include <dev/hyperv/vmbus/hyperv_var.h> 35 #include <dev/hyperv/vmbus/hyperv_common_reg.h> 36 #include <dev/psci/smccc.h> 37 38 #define HVCALL_SET_VP_REGISTERS 0x0051 39 #define HVCALL_GET_VP_REGISTERS 0x0050 40 #define BIT(A) (1 << (A)) 41 #define HV_HYPERCALL_FAST_BIT BIT(16) 42 #define BIT_ULL(a) (1ULL << (a)) 43 #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32) 44 #define HV_PARTITION_ID_SELF ((u64)-1) 45 #define HV_VP_INDEX_SELF ((u32)-2) 46 #define HV_SMCCC_FUNC_NUMBER 1 47 48 #define HV_FUNC_ID \ 49 SMCCC_FUNC_ID(SMCCC_YIELDING_CALL, SMCCC_64BIT_CALL, \ 50 SMCCC_VENDOR_HYP_SERVICE_CALLS, HV_SMCCC_FUNC_NUMBER) 51 52 void 53 arm_hv_set_vreg(u32 msr, u64 value) 54 { 55 arm_smccc_hvc(HV_FUNC_ID, 56 HVCALL_SET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT | 57 HV_HYPERCALL_REP_COMP_1, 58 HV_PARTITION_ID_SELF, HV_VP_INDEX_SELF, msr, 0, value, 0, NULL); 59 } 60 61 void 62 hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *result) 63 { 64 struct arm_smccc_1_2_regs args; 65 struct arm_smccc_1_2_regs res; 66 67 args.a0 = HV_FUNC_ID; 68 args.a1 = HVCALL_GET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT | 69 HV_HYPERCALL_REP_COMP_1; 70 args.a2 = HV_PARTITION_ID_SELF; 71 args.a3 = HV_VP_INDEX_SELF; 72 args.a4 = msr; 73 74 /* 75 * Use the SMCCC 1.2 interface because the results are in registers 76 * beyond X0-X3. 77 */ 78 arm_smccc_1_2_hvc(&args, &res); 79 80 result->as64.low = res.a6; 81 result->as64.high = res.a7; 82 } 83 84 u64 85 arm_hv_get_vreg(u32 msr) 86 { 87 struct hv_get_vp_registers_output output; 88 89 hv_get_vpreg_128(msr, &output); 90 91 return (output.as64.low); 92 } 93 94 uint64_t 95 hypercall_md(volatile void *hc_addr, uint64_t in_val, uint64_t in_paddr, 96 uint64_t out_paddr) 97 { 98 struct arm_smccc_res res; 99 100 arm_smccc_hvc(HV_FUNC_ID, in_val, in_paddr, out_paddr, 0, 0, 0, 0, 101 &res); 102 103 return (res.a0); 104 } 105