At the end of the day, linux wants to make software and windows wants to make money
# How does a Computer Work?
Creating a design of a house can be considered as computer architecture, whereas building the house can be considered as computer organization.
- Charge, current
- Diod
- How do junctions work?
- Doping process?
- Forward and Backward biased
- Transistor, BJT, MOSFET, CMOS
- Logic Gates
- Flip Flops - Registers
- How to we save config in system. Design memory
- S-RAM, D-RAM
- Boolean Algebra - CPU Logic
- Control Unit
- Arithmetic And Logic Unit
- ISA - Instruction Set Architecture
- operations and microoperations
- load, store, jump, aluops
- ISA Comparision
- operations and microoperations
- Architectures
- SISD, SIMD, MISD, MIMD
- vector architecture
- How do we tell CPU what to do?
- Programming
- levels of praogramming
- How does CPU keep track of multiple instructions
- CPU CLock synchronization
- CPU Pipelining
- TOmosulos algorithm
- Memory Hierarchy
Software make for society
- Computer only understand 0 and 1, unreadable for humans
- Assembly level languages - Opcode mnemonics
- more redable than machine code
ADD R1 R2- use hexademical, decimal and octal number system for representing 0's and 1's
- Assembly level languages - Opcode mnemonics
- Assemly is hard to write by humans, keeping track of all memory locations and pointers
- Enter Compilers
- How to process the opcodes? Hardware problem
- How we generate opcoddes? - COmpiler Backend problem
- GNU Compiler COllection GCC, LLVM
- Then came more hardware peripherals
- Operating System
- Drivers
- Firmware
- Application Software
- Why did we have to put
;at the end of each line?- to make it easy for parser to break instructions
Machine Code | Bytecode | Assembly Code?
Machine code is generally different from bytecode (also known as p-code), which is either executed by an interpreter or itself compiled into machine code for faster (direct) execution. An exception is when a processor is designed to use a particular bytecode directly as its machine code, such as is the case with Java processors.
Machine code and assembly code are sometimes called native code when referring to platform-dependent parts of language features or libraries
# questions
- How to count the #lines of machine code written by a program?
- for source code cloc
- How to print the machine code?
gcc -o fib fib.c
otool -tv fib
# Why do people contribute to opensource?
- I want to solve a problem
- I want to build my reputation
- I feel like I belong here, found theor tribe
- Its fun for me
- I am learning
# Rust vs C++
- 90,000 bugs in C++ source code
- All gaming engines are in
C++