Kernel

This came up during the discussion on #13640, which specifically only adds single character/code point/code unit display for three common text encodings. A nice feature would be to decode and display the entire user selection as a string. Right now, the length of the user selection is not considered for value inspector data, just the starting position is used to read the next 8-bit number, 16-bit

Now that we have the checklocks analyzer, we should annotate values that are lock-protected with an appropriate checklocks attribute.

以下测试环境为：

• Win10 系统
• 通过 scons --dist 新生成的 qemu 环境
• 每隔 1 秒通过串口 COM9 发送 hello world 的下位机

输入下述命令运行 qemu 程序：

qemu-system-arm -M vexpress-a9 -kernel rtthread.bin --nographic -serial mon:stdio -serial COM9

结果显示系统崩溃，并且是在 qemu 接收第一个字节后崩溃。

下位机不主动发送数据给上位机时，工作正常。

• The set_mode_X() HIL functions need to support returning an error if hardware does not support that mode or if the implementation cannot put the hardware in to that mode at that time. See for an example where panic is used instead of returning an error https://github.com/tock/tock/pull/2629/files.

Describe the bug
the bzimage package can't unpack kernels compress with xz. This is because when I wrote it I was not sure how to find
the compressed part and used a simple minded search.

To Reproduce
create a bzImage but enable XZ compression in the kernel (yep, it's still called a bzimage)
use the kexec command with debug and note you see this:
2022/02/02 21:13:15 Failed to unpa