zircon/vdso/smc.fidl

// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
library zx;

// TODO(scottmg): ARM_SMC_xyz.

type SmcParameters = struct {
    func_id uint32;
    arg1 uint64;
    arg2 uint64;
    arg3 uint64;
    arg4 uint64;
    arg5 uint64;
    arg6 uint64;
    client_id uint16;
    secure_os_id uint16;
};

type SmcResult = struct {
    arg0 uint64;
    arg1 uint64;
    arg2 uint64;
    arg3 uint64;
    arg6 uint64; // at least one implementation uses it as a way to return session_id.
};

@transport("Syscall")
protocol smc {
    // TODO(fxbug.dev/32803): handle No rights required?
    /// Make Secure Monitor Call (SMC) from user space.
    smc_call(resource struct {
        handle handle:RESOURCE;
        parameters SmcParameters;
    }) -> (struct {
        status status;
        out_smc_result SmcResult;
    });
};