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[Feature] 对 hwtimer/ktime/cputime 进行整体重构
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@BernardXiong is already working on this.
Since Dec 29, 2025.
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Description
Describe problem solved by the proposed feature
目前 hwtimer/ktime/cputime 整体非常乱，应该从整体维度上进行重构，让它有一个更好的架构：
- 简单清晰；
- 针对MCU场景考虑，针对MPU场景考虑；
- 反映到实时场景下的要求；
- 如进行更改，应对所有涉及到的bsp进行检查并进行修改，至少保证构建无错，qemu测试通过；
对于这部分的重构，应该先给出整体设计，涉及到的文件评估，完成重构，ci涉及到的每个bsp构建，qemu测试通过。
Describe your preferred solution
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Describe possible alternatives
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Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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