Robert Crossfield segrax

segrax / BashHistoryAutocomplete

Last active August 29, 2015 14:03

search command prompt history with auto complete

	# .bashrc
	bind '"\e[A":history-search-backward'
	bind '"\e[B":history-search-forward'

segrax / CreateFreeBSDVm.sh

Last active September 8, 2020 16:05

Create a FreeBSD 64bit VM with VirtualBox, on FreeBSD, Accepting VNC Connections

	# Create a VM named 'MyBSDBox' (64 bit FreeBSD)
	VBoxManage createvm --ostype FreeBSD_64 --register --basefolder /vms --name MyBSDBox

	# 1gig of memory, 1 CPU.. and set the network to bridged via EM0, emulating the 82540EM chipset
	VBoxManage modifyvm MyBSDBox --memory 1024 --ioapic on --cpus 1 --chipset ich9 --nic1 bridged --nictype1 82540EM --bridgeadapter1 em0

	# 20 gig Dynamic HDD image, on sata controller
	VBoxManage createhd --size 20000 --filename "/vms/MyBSDBox/MyBSDBox.vdi"
	VBoxManage storagectl MyBSDBox --name "SATA Controller" --add sata --controller IntelAhci --portcount 4
	VBoxManage storageattach MyBSDBox --storagectl "SATA Controller" --port 0 --device 0 --type hdd --medium "/vms/MyBSDBox/MyBSDBox.vdi"

segrax / BSD Youtrack rc script

Last active January 22, 2023 00:12 — forked from artuomvproskunin/BSD Youtrack rc script

Youtrack Startup script

	#!/bin/sh

	# $FreeBSD: head/devel/youtrack/files/youtrack.in 329474 2013-10-05 16:11:37Z lwhsu $
	#
	# PROVIDE: youtrack
	# REQUIRE: LOGIN
	# KEYWORD: shutdown

	#
	# Configuration settings for youtrack in /etc/rc.conf:

segrax / MemorySegments

Last active August 29, 2015 14:12

Memory Segment Calculations

	To calculate the segment of a memory address,

	Memory Address >> 4 = Segment
	-----------------------------
	0xFFFF0 >> 4 = 0xFFFF


	To calculate the memory address from a segment

	Segment << 4 = Memory Address

segrax / x64_function_call_register_use

Last active August 29, 2015 14:16

x64 CPU Register function call usage

	RAX temporary register; with variable arguments passes information about the number of vector registers used; 1st return register

	RDI used to pass 1st argument to functions
	RSI used to pass 2nd argument to functions
	RDX used to pass 3rd argument to functions; 2nd return register
	RCX used to pass 4th argument to functions
	R8 used to pass 5th argument to functions
	R9 used to pass 6th argument to functions

segrax / X64 Memory Paging

Last active August 29, 2015 14:16

Calculating Indexs from a virtual address

	PML4 Directory Ptr Page Directory Page Table Page Offset
	x-xxxx-xxxx x-xxxx-xxxx x-xxxx-xxxx x-xxxx-xxxx XXXX-XXXX-XXXX


	$address = 0xFF8000000000;

	$pml4 = ($address & 0xFF8000000000) >> 39;
	$pdp = ($address & 0x7FC0000000) >> 30;
	$pd = ($address & 0x3FE00000) >> 21;
	$pt = ($address & 0x1FF000) >> 12;

segrax / BytesToSigned.php

Last active August 29, 2015 14:25

Take an array of bytes, and output a series of signed integers (16bit)

segrax / ConvertSpriteData.php

Last active September 6, 2015 23:44

Convert structures of sprite data and change address to a relative address, instead of an absolute

segrax / FreeBSD_ManualInstall

Last active July 6, 2017 21:43

FreeBSD manual install on zfs


	mdconfig -a -t vnode -f FreeBSD-11.0-RELEASE-amd64-disc1.iso
	mount -t cd9660 /dev/md0 /cdrom

	zfs create pool/os
	zfs create pool/os/fbsd11

	export DESTDIR=/pool/os/fbsd11

	cd /cdrom/usr/freebsd-dist

segrax / Amiga_Lemmings_Codes

Created December 22, 2015 06:47

Lemmings Codes