FreeBSD/Linux Kernel Cross Reference
sys/dev/hyperv/vmbus/aarch64/hyperv_machdep.c

     /*- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2016-2017,2022 Microsoft Corp.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <dev/hyperv/include/hyperv.h>
    #include <dev/hyperv/include/hyperv_busdma.h>
    #include <dev/hyperv/vmbus/aarch64/hyperv_machdep.h>
    #include <dev/hyperv/vmbus/aarch64/hyperv_reg.h>
    #include <dev/hyperv/vmbus/hyperv_var.h>
    #include <dev/hyperv/vmbus/hyperv_common_reg.h>
    #include <dev/psci/smccc.h>
    
    #define HVCALL_SET_VP_REGISTERS 0x0051
    #define HVCALL_GET_VP_REGISTERS 0x0050
    #define BIT(A) (1 << (A))
    #define HV_HYPERCALL_FAST_BIT BIT(16)
    #define BIT_ULL(a) (1ULL << (a))
    #define HV_HYPERCALL_REP_COMP_1 BIT_ULL(32)
    #define HV_PARTITION_ID_SELF ((u64)-1)
    #define HV_VP_INDEX_SELF ((u32)-2)
    #define HV_SMCCC_FUNC_NUMBER 1
    
    #define HV_FUNC_ID                                           \
            SMCCC_FUNC_ID(SMCCC_YIELDING_CALL, SMCCC_64BIT_CALL, \
                SMCCC_VENDOR_HYP_SERVICE_CALLS, HV_SMCCC_FUNC_NUMBER)
    
    void
    arm_hv_set_vreg(u32 msr, u64 value)
    {
            arm_smccc_hvc(HV_FUNC_ID,
                HVCALL_SET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT |
                    HV_HYPERCALL_REP_COMP_1,
                HV_PARTITION_ID_SELF, HV_VP_INDEX_SELF, msr, 0, value, 0, NULL);
    }
    
    void
    hv_get_vpreg_128(u32 msr, struct hv_get_vp_registers_output *result)
    {
            struct arm_smccc_1_2_regs args;
            struct arm_smccc_1_2_regs res;
    
            args.a0 = HV_FUNC_ID;
            args.a1 = HVCALL_GET_VP_REGISTERS | HV_HYPERCALL_FAST_BIT |
                HV_HYPERCALL_REP_COMP_1;
            args.a2 = HV_PARTITION_ID_SELF;
            args.a3 = HV_VP_INDEX_SELF;
            args.a4 = msr;
    
            /*
             * Use the SMCCC 1.2 interface because the results are in registers
             * beyond X0-X3.
             */
            arm_smccc_1_2_hvc(&args, &res);
    
            result->as64.low = res.a6;
            result->as64.high = res.a7;
    }
    
    u64
    arm_hv_get_vreg(u32 msr)
    {
            struct hv_get_vp_registers_output output;
    
            hv_get_vpreg_128(msr, &output);
    
            return (output.as64.low);
    }
    
    uint64_t
    hypercall_md(volatile void *hc_addr, uint64_t in_val, uint64_t in_paddr,
        uint64_t out_paddr)
    {
            struct arm_smccc_res res;
    
           arm_smccc_hvc(HV_FUNC_ID, in_val, in_paddr, out_paddr, 0, 0, 0, 0,
               &res);
   
           return (res.a0);
   }

Cache object: 01ae3dfc3abedbfdde1611b09547cb55