Gustavo Duartes has a really great blog[1] about kernels and low-level development, with Linux on x86/amd64 being the reference. Here[2] is the one where he go

Gustavo Duartes has a really great blog[1] about kernels and low-level development, with Linux on x86/amd64 being the reference. Here[2] is the one where he goes into CPU rings and kernel- versus user-mode. 1. http://duartes.org/gustavo/blog/archives/ http://duartes.org/gustavo/blog/archives/ 2. http://duartes.org/gustavo/blog/post/cpu-rings-privilege-and-protection/ http://duartes.org/gustavo/blog/post/cpu-rings-privilege-and...