1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158
// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use crate::{Error, Result};
use optee_utee_sys as raw;
use std::fmt;
/// A millisecond resolution structure for saving the time.
pub struct Time {
/// The field for the seconds.
pub seconds: u32,
/// The field for the milliseconds within this second.
pub millis: u32,
}
impl Time {
/// Create a new empty time structure.
pub fn new() -> Self {
Time {
seconds: 0,
millis: 0,
}
}
/// Retrieve the current system time.
/// The origin of this system time is arbitrary and implementation-dependent.
/// Different TA instances may even have different system times.
/// The only guarantee is that the system time is not reset or rolled back during the life of a
/// given TA instance, so it can be used to compute time differences and operation deadlines.
///
/// # Example
///
/// ```no_run
/// let mut time = Time::new();
/// time.system_time()?;
/// ```
///
/// # Panics
///
/// 1) If the Implementation detects any error.
pub fn system_time(&mut self) {
unsafe {
raw::TEE_GetSystemTime(self as *mut _ as _);
}
}
/// Wait for the specified number of milliseconds or wait forever if timeout equals
/// `raw::TEE_TIMEOUT_INFINITE` (0xFFFFFFFF). The waiting timer is `System Time`.
///
/// # Parameters
///
/// 1) `timeout`: The number of milliseconds to wait, or `raw::TEE_TIMEOUT_INFINITE`.
///
/// # Example
///
/// ```no_run
/// Time::wait(1000)?;
/// ```
///
/// # Errors
///
/// 1) `Cancel`: If the wait has been cancelled.
///
/// # Panics
///
/// 1) If the Implementation detects any error.
pub fn wait(timeout: u32) -> Result<()> {
match unsafe { raw::TEE_Wait(timeout) } {
raw::TEE_SUCCESS => Ok(()),
code => Err(Error::from_raw_error(code)),
}
}
/// Retrieve the persisten time of the Trusted Application. Since the timer is not
/// automatically set, this function should be called after [set_ta_time](Time::set_ta_time).
/// The time is a real-time source of time and the origin of this time is set individually by each Trusted Application.
/// Also, the time SHALL persist across reboots.
///
/// # Example
///
/// ```no_run
/// let mut time = Time()?;
/// time.system_time()?;
/// time.set_ta_time()?;
/// time.ta_time()?;
/// ```
///
/// # Errors
///
/// 1) `TimeNotSet`: Time is not set.
/// 2) `TimeNeedsReset`: Time needs to be reset.
/// 3) `Overflow`: The number of seconds in the TA Persistent Time overflows the range of a
/// `u32`. The field `seconds` is still set to the TA Persistent Time truncated to 32 bits.
///
/// # Panics
///
/// 1) If the Implementation detects any error.
pub fn ta_time(&mut self) -> Result<()> {
match unsafe { raw::TEE_GetTAPersistentTime(self as *mut _ as _) } {
raw::TEE_SUCCESS => Ok(()),
code => Err(Error::from_raw_error(code)),
}
}
/// Set the persistent time of the current Trusted Application.
///
/// # Errors
///
/// 1) `OutOfMemory`: If not enough memory is available to complete the operation.
/// 2) `SotrageNoSpace`: If insufficient storage space is available to complete the operation.
///
/// # Panics
///
/// 1) If the Implementation detects any error.
pub fn set_ta_time(&self) -> Result<()> {
match unsafe { raw::TEE_SetTAPersistentTime(self as *const _ as _) } {
raw::TEE_SUCCESS => Ok(()),
code => Err(Error::from_raw_error(code)),
}
}
/// Retrieve the current REE system time.
/// The time is as trusted as the REE itself and may also be tampered by the user.
///
/// Panics
///
/// 1) If the Implementation detects any error.
pub fn ree_time(&mut self) {
unsafe {
raw::TEE_GetREETime(self as *mut _ as _);
}
}
}
impl fmt::Display for Time {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"(second: {}, millisecond: {})",
self.seconds, self.millis
)
}
}