汇编语言

Martin Fowler最新洞察：LLM 不止是“更高”的抽象，它正在改变编程的“本质”！ - Tony Bai =============== Tony Bai 一个程序员的心路历程 Google Go语言编码风格规范 ...

本文永久链接 – https://tonybai.com/2022/12/18/go-type-system Go是一门强类型的静态编程语言。使用Go编程，我们的每一行代码几乎都离不开类型。因此，深入学习Go，我们首先要对Go的类型系统(type system)有一个全面和深入的认知。Go类型系统可以给予我们一个全局整体的视角，以帮助我们更好地学习和理解Go语言中那些具体的与类型相关的内容。 ...

这几天以前曾经做过的一个项目上线测试了，果不其然，没有经过’战争洗礼’的产品就是靠不住，这不出了若干问题。害得我逃了半天课远程支持。 其中的一个问题很值得思考。其所在的模块并非是一个核心功能模块，而是一个提高系统Availability的一个功能模块，主要功能就是监视磁盘占用率。我们通过配置给出允许使用的磁盘空间大小(以M Byte为单位)，以及两个阈值，即当占用率达到多少的时候，Do A；达到多少的时候Do B。 ...

After being decompressed, the kernel image starts with another ‘startup_32′ function included in $(linux-2.6.15.3_dir/arch/i386/kernel/head.S’. This ‘head.S’ is the second one in linux source package, which is also called ‘kernel head’. And it is exactly what we want to describe in this artical. ...

_Why do we do this? Don’t ask me.. Incomprehensible are the ways of bootloaders. _ — comments in arch/i386/boot/compressed/misc.c There are two ‘head.S’ in linux source package. One is in $(Linux-2.6.15.3_dir/arch/i386/boot/compressed and the other one is in $(Linux-2.6.15.3_dir/arch/i386/kernel. The first one will be analyzed in this artical. Before we go ahead, let’s show a news of linux, that is ‘Army leans toward Linux for FCS(Future Combat System)’. ...

The phase we talked about before is in ‘Real-address Mode’, which runs 16-bit program modules. At the tail of “Begin ‘setup.S’”, we had moved to ‘Protected Mode’, which usu runs 32-bit program modules. So there are two big problems which are ‘How to transfer control between 16-bit code and 32-bit code’ and how to transfer control from ‘real-mode’ to protected mode’. They are also what we wanna talk about in this artical. ...

So far we have arrived at the gate leading to the real kernel. And we’d better stop for a short break in order that we would have more energy to go ahead. Now let’s examine what we do to memory these days. Virtually what we want to do is drawing some pictures to describe the layout of the memory in various phases. For the layout is related to the bootloader, we’d better make our work based on the following assumption: The machine has two systems installed (Windows XP and Linux) and uses LILO as the bootloader. Let us look at the LILO configuration: ...

It is time for ‘setup.S’ to show its power. The ‘setup.S’ is loaded by the bootloader and virtually it belongs to neither the ‘bootstrap’ routine nor the kernel program, although it is a portion of the kernel image. The source of the ‘setup.S’ is kinda ‘big’ and what it does can be summarized into one word: “the ‘setup.S’ is responsible to establish the environment for the execution of the kernel program”. ...

The term ‘Bootstrap’, which originally refers to a person who tries to stand up by pulling his own boots, refers to a subroutine used to establish the full routine(its own left part, i think) or another routine in computer science. Today modern computers act as a vital role in our daily life and many of you may wonder what happens to the computer when you have it powered on. The ‘Bootstrap’, which is also called ‘boot’ for short, is the first step to be done by the computer. The process of ‘Bootstrap’, which starts on when the computer is powered on and usu ends off when the kernel of the operating system begins to run, is just what we are gonna describe. ...

The term ‘i386′ in the title does not refer to the real Intel 80386 processor but the representative of Intel 32-bit architecture(IA32). I prefer ‘i386′ rather than ‘IA32′ just like what the linux kernel does, since you can find ‘i386′ folder in $(linux-2.6.x_dir)/arch directory. This artical describes some basic knowledge of ‘i386′, which may be kinda useful to those guys who wanna do research on or develop operating system. ...