Osman Karaketir karaketir16

The machine level has the highest privileges and is the only mandatory privilege level for a RISC-V hardware platform. Code run in machine-mode (M-mode) is usually inherently trusted, as it has low-level access to the machine implementation. M-mode can be used to manage secure execution environments on RISC-V. User-mode (U-mode) and supervisor-mode (S-mode) are intended for conventional application and operating system usage respectively.

The lock feature of the optional PMP facility can provide some limited protection even with only M-mode implemented.

The SYSTEM major opcode is used to encode all privileged instructions in the RISC-V ISA. These can be divided into two main classes: those that atomically read-modify-write control and status registers

Simple CPU Instruction Set

Overview

12-bit registers: R0--R7 (3-bit register indices).
R0 is hardwired to zero.
All instructions are 16 bits.
Instruction groups by opcode patterns:
- 0000 (0x0): Arithmetic & Shift Instructions (with funct field)
- 0001 (0x1): Logical Instructions (with funct field)

	import os
	import sys
	import shutil
	import hashlib
	from pathlib import Path

	def get_models_path(custom_path=None):
	if custom_path:
	return custom_path

	.section .text
	.globl start

	# riscv64-unknown-elf-as -g entry.s -o entry.o && riscv64-unknown-elf-ld -T baremetal.ld entry.o -o entry
	# qemu-system-riscv64 -machine virt -cpu sifive-u54 -smp 1 -s -S -nographic -bios none -kernel entry
	# or
	# qemu-system-riscv64 -machine virt -cpu rv64 -smp 1 -s -S -nographic -bios none -kernel entry

	start:
	# Load address of 'supervisor' into t0 and set mepc

	#include <iostream>

	int multiply(int number_a, int number_b){
	return number_a * number_b;
	}

	int my_function()
	{
	int c;
	c = 5;

	#/etc/systemd/network/20-wired.network

	[Match]

	Name=eth0

	[Network]

	Address=192.168.8.55/24

	#!/bin/sh
	#/etc/mini_x/session.d/disableDPMS

	/usr/bin/xset -dpms s off s noblank s 0 0 s noexpose