Update Utility containers

Utility-containers.md

@@ -2,7 +2,51 @@
 
 (Add a section for each new utility container,  as well as documentation)
 
+Preliminary list of essential software:
+- QEMU: open-source machine emulator
+- gcc:
+- gdb:
+- make:
+- objdump:
+- ...
 
+(ubuntu dockerfile...)
+ 
+### Step 1: Make a bootloader that prints 'dmzOS'
+> **Suggested reading**:
+> [Operating Systems: From 0 to 1, Chapter 7: *Bootloader*][os01]
+
+A few dilemmas had already emerged before even having started writing any code.
+
+***Should the kernel be 32-bit or 64-bit?***
+* A 32-bit kernel can provide access to 2<sup>32</sup> memory addresses. For a byte-addressable memory, that equals 2<sup>32</sup> B = 4*2<sup>30</sup> B = 4 GiB of physical memory. On the other hand, a 64-bit kernel can provide access to 2<sup>64</sup> B = 16 EiB of physical memory.
+* Having more RAM available makes heavy multitasking and memory-intensive operations perform better. On the other hand, 64-bit programs use about 50% more memory then their 32-bit counterpart; this is due to numerous reasons, one of which is that 64-bit pointers take up twice as much space as 32-bit ones.
+* The x86_64 architecture has two primary [modes of operation](https://en.wikipedia.org/wiki/X86-64#Operating_modes), each having different sub-modes. A 64-bit and 32-bit kernel require the processor to operate in different modes.
+
+*Decision*: In order to prevent running into chaos, we will first stick to the steps outlined in [Operating Systems: From 0 to 1][os01], which will result in our developing a 32-bit kernel stub. At that point, we will have necessary information to decide whether it aligns better with our goals to keep the kernel 32-bit or to convert it into a 64-bit version.
+
+***Intel or AT&T syntax for asm code?***
+* This is simply a matter of personal preference, as both are translated into the same machine code.
+
+*Decision*: Intel syntax, as it is used both in [AMD][amd64v1] and [Intel][intel64] architecture manuals.
+(...)
+
+### Step 2:
+(...)
+
+## List of command cheatsheets
+### Docker
+### gcc, gdb, clang-format...
+(...)
+
+## Useful links
+### Wiki
+* [OSDev Wiki](https://wiki.osdev.org/Expanded_Main_Page): a good way to get acquainted with multiple topics at a high level, though a bit outdated.
+### Books
+* [Operating Systems: From 0 to 1][os01]: pretty in-depth and with hands-on instructions on how to use many of the tools needed.
+* [OpenCSF](https://w3.cs.jmu.edu/kirkpams/OpenCSF/Books/csf/html/index.html): an all-encompassing CS guide with a focus on many important OS-related topics.
+### Blogs
+* [CPU Land](https://cpu.land/): an avid learner's perspective on the CS fundamentals.
 
 [//]: # (Second part of reference-style links)
 [os01]: https://github.com/tuhdo/os01