From 734f042c9d99e0110d5e4cf8f2994a5ce27385d1 Mon Sep 17 00:00:00 2001 From: garhve Date: Tue, 14 Feb 2023 18:29:13 +0800 Subject: delete zola --- content/post/architecture of linux kernel.md | 26 -------------------------- 1 file changed, 26 deletions(-) delete mode 100644 content/post/architecture of linux kernel.md (limited to 'content/post/architecture of linux kernel.md') diff --git a/content/post/architecture of linux kernel.md b/content/post/architecture of linux kernel.md deleted file mode 100644 index 5547051..0000000 --- a/content/post/architecture of linux kernel.md +++ /dev/null @@ -1,26 +0,0 @@ -+++ -title = "Architecture of Linux Kernel" -date = 2022-09-03 -[taxonomies] -categories = ["cs"] -tags = ["linux"] -[extra] -math = true -+++ -## Description - -Modern microcontrollers nowadays support at least two privilege levels. Intel/AMD x86-64 family supports 4 levels, whilst ARM (32bit) microcontrollers support up to 7 levels (6 privileged, 1 non-privileged). - -Modern operating systems support at least 2 levels: - -- **User space**: For applications to run in unprivileged user mode -- **Kernel space**: For the kernel (and all its components) to run in privileged mode – kernel mode - -Address of these 2 spaces are separate. - -Applications in user mode will auto-linked to glibc(the GNU standard C library). Libraries only available in user mode, kernel mode doesn't have this conception. An application only can through **System call** to access kernel. On the other hand, system calls are the only legal entry point into the kernel space. - -> Libraries APIs: man section 3 -> System calls APIs: man section 2 - -to be continue... -- cgit v1.2.3-70-g09d2