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 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 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 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 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