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6.4节的翻译问题 about mit6.s081 HOT 1 CLOSED

huihongxiao commented on August 20, 2024

6.4节的翻译问题

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huihongxiao commented on August 20, 2024

原文中有这么一段话

这里的控制是通过STVEC寄存器完成的，这是一个只能在supervisor mode下读写的特权寄存器。在从用户空间进入到内核空间之前，内核会设置好STVEC寄存器指向内核希望trap代码运行的位置。

这里说STVEC寄存器是内核设置的，那么是不是应该是“从内核空间进入到用户空间之前，内核会设置好STVEC寄存器”？

的确。因为用户空间在最最最开始是从内核空间的代码进入的，在这个时候，内核会设置STVEC寄存器，这样当用户空间代码需要进入trap时，PC会跳转到STVEC寄存器的地址。

还有一处可能有问题的地方

切换page table的代价比较高，如果ecall打包完成了这部分工作，那就不可能对一些系统调用进行改进，使其不用在不必要的场景切换page table。

这里的这个不可能似乎有些不通畅？

不可能改成了不能

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