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# 教程 07 - 时间戳
## tl;dr
- 我们为计时器硬件添加了抽象，并在`_arch/aarch64`中实现了ARM架构计时器。
- 新的计时器函数用于给UART打印添加时间戳，
- 添加了`warn!()`宏。
## 测试它
请通过 chainboot 进行检查（在上一个教程中添加）。
```console
$ make chainboot
[...]
Minipush 1.0
[MP] ⏳ Waiting for /dev/ttyUSB0
[MP] ✅ Serial connected
[MP] 🔌 Please power the target now
__ __ _ _ _ _
| \/ (_)_ _ (_) | ___ __ _ __| |
| |\/| | | ' \| | |__/ _ \/ _` / _` |
|_| |_|_|_||_|_|____\___/\__,_\__,_|
Raspberry Pi 3
[ML] Requesting binary
[MP] ⏩ Pushing 12 KiB =========================================🦀 100% 0 KiB/s Time: 00:00:00
[ML] Loaded! Executing the payload now
[ 0.143123] mingo version 0.7.0
[ 0.143323] Booting on: Raspberry Pi 3
[ 0.143778] Architectural timer resolution: 52 ns
[ 0.144352] Drivers loaded:
[ 0.144688] 1. BCM PL011 UART
[ 0.145110] 2. BCM GPIO
[W 0.145469] Spin duration smaller than architecturally supported, skipping
[ 0.146313] Spinning for 1 second
[ 1.146715] Spinning for 1 second
[ 2.146938] Spinning for 1 second
```
## 相比之前的变化（ ）