pepperOS/docs/MANUAL.md

PepperOS Manual

Table of Contents

• Overview
  • Supported Hardware
  • Features
• Kernel architecture
  • Boot process
  • Memory management
  • Scheduling
  • Input/output
• Syscall table

I. Overview

a. Supported Hardware

The recommended hardware to run PepperOS is the following:

• UEFI/BIOS
• Any x86 processor, 64-bits only
• PS/2 Keyboard
• Minimum 128MB of memory

b. Features

• Round robin preemptive scheduling
• Coexistence of ring 0 and ring 3 processes

II. Kernel architecture

a. Boot process

b. Memory management

c. Scheduling

d. Input/Output

III. Syscall table

The syscall interface in the Pepper kernel uses the System V ABI convention for argument order. It vaguely mimics Unix-like systems.

Name	Number (%rax)	arg0 (%rdi)	arg1 (%rsi)	arg2 (%rdx)
sys_read	0	unsigned int fd	char* buf	size_t count
sys_write	1	unsigned int fd	const char* buf	size_t count
sys_open	2	const char* filename	int flags
sys_close	3	unsigned int fd
sys_exit	60	int error_code