MIT 6.828 Operating System Lab https://pdos.csail.mit.edu/6.828/2018/schedule.html
Home Page: https://pdos.csail.mit.edu/6.828/2018/schedule.html
License: GNU General Public License v3.0
✨ Interested in OS kernel, system security and virtualization.
✍️ I wrote dev articles on My Blog
📫 How to reach me: Email: [email protected] | 知乎
📝 Blog posts:
因為這repo應該是最容易搜到的6.828repo.
所以在這裡填一個坑.
使用新的 toolchain 有可能在lab5之後遇上multiple definition 的error. 這是由於 gcc 把 default 的 -fcommon 改成了 -fno-common.
解決方法：在 makefile 中的 CFLAGS 加上 -fcommon
这是怎么回事？
__attribute__((__aligned__(PGSIZE)))
pde_t entry_pgdir[NPDENTRIES] = {
// Map VA's [0, 4MB) to PA's [0, 4MB)
// 在数组定义中，这是什么写法？
[0]
= ((uintptr_t)entry_pgtable - KERNBASE) + PTE_P,
// Map VA's [KERNBASE, KERNBASE+4MB) to PA's [0, 4MB)
[KERNBASE>>PDXSHIFT]
= ((uintptr_t)entry_pgtable - KERNBASE) + PTE_P + PTE_W
};
这是C99初始化数组的一个写法，给特定下标赋值。
此处把页描述符数据写入页表的第0项和第KERNBASE>>PDXSHIFT项，其余全为0（page invalid），非常简洁明了
感谢您整理的笔记，学到了很多
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