Timeline

Thought I might amuse myself by creating a devlopment timeline for OZONE. This is being done retrospectively as of today, Feb 11, 2002. I am doing this by looking back at old versions of my source files.

The things listed here are when a particular element was started. There are always continual bug fixes of old stuff going on. Nothing is ever finished, except the bootblock!

• March 1997

  The earliest source files I have are dated March 1997. They are for threads, physical memory, processes, system-global data and sections. Here it sits for a year-and-a-half.

• August 1998

  Create AST's, a boot routine, the device/IO objects, event flags, handles, kernel memory malloc (linked list), and printk. Get this all running as a program under VMS.

• September 1998

  Create 486 boot block, floppy driver, kernel console driver, logical names, lowipl (gets from high-ipl back to lowipl), dummy security objects, system pagetable entry manager, startup routine (orignally contained what is now the console diag stuff), secondary loader, beginning of system service calls. Start disk filesystem driver.

• October 1998

  Assembler routines common to loader and kernel moved to common source file. Created timer driver, main kernel module, start c-runtime library routines, create OZONE image loader, create logical name objects, finish writing loader. Create IDE disk driver.

• November 1998

  Create C-runtime-like I/O calls, user-mode malloc and Unix-like signal handlers. Create spawn syscall, write elf-to-ozone image converter.

• December 1998

  Create User, Job and Quota objects. Create 'logon' executable.

• January 1999

  Create OZ_CLI (shell), create user-mode I/O and logical name system calls. Create generic xprintf routine and user-mode copy command executable.

• February 1999

  Create disk partition driver, Realtek 8139 driver. Create console diag module. Create user-mode callable user/job/process/thread syscalls. Create dir, initvol, mountvol command-line utilities.

• March 1999

  Create IP stack driver and IP command line utility

• April 1999

  Create Dec Tulip driver (gave up on Realtek), create kernel debugger, condition handlers and instruction disassembler routine. Also create Telnet client.

• May 1999

  Create console driver along with VGA and pseudo-terminal drivers. Create Telnet daemon.

• June 1999

  Create stdio replacement, ramdisk driver, generic xscanf routine. Create dismount command line utility. Replace linked-list malloc with boundary-tag.

• July 1999

  Create IP-FS filesystem driver. Create 'create directory' command line utility.

• August 1999 thru December 1999

  nothing

• January 2000

  Created pipe driver, user-mode debugger

• February 2000

  Created mutex driver, disk cache routines, 'make' command line utility. Port GLIBC, GCC, LD, AR, GAS, AS86, LD86 to run under OZONE.

• March 2000

  Created PS/2 mouse driver, split 486 console driver into separate keyboard and video modules. Wrote shutdown command line utility.

• April 2000

  Split out cache routines from disk cache so they can be used to cache DNS entries. Started on BSD-style network routines.

• July 2000

  Created LSI Logic SCSI driver

• August 2000

  Unify OZONE Make and Linux Make. Create SCSI Disk class driver. Create crash dump file routines. Create 'cat', 'dd', 'dump', 'make', 'scsi' command line utilities. Create FTP daemon. Create EDT.

• September 2000

  Create partition boot block. Create ethernet loopback driver. Create 'write boot-block' command line utility.

• October 2000

  Create 'binned' malloc routine (replaced boundary-tag method). Create a 'become user' routine for servers to assume identity of a given user. Create password checking routines. Create kernel profiling utility.

• November 2000

  Create DNS lookup driver, create 'top' command line utility.

• December 2000

  Try to create i82558 driver from Linux. Create 'fork' routine. Create 'delete' command line utility.

• January 2001

  Split SMP routines into their own module and create uniprocessor equivalents

• February 2001 thru July 2001

  nothing (good God ya'll!)

• August 2001

  nothing new, bug fixes

• September 2001

  PIIX4 IDE driver, use PCI BIOS to scan PCI bus for devices

• October 2001

  nothing new, bug fixes

• November 2001

  nothing new, bug fixes

• December 2001

  Split disk filesystem driver into FS-independent and -dependent sections

• January 2002

  Finish kernel extension image loading. Start porting UDI.

• March, April, May 2002

  Port StorageCenter backup software and deploy at nii.net. Write oz_stego driver.

• June 2002

  Implement per-process data for kernel and put image header stuff in it. Implement paged pool. Implement memoury colouring.

• July 2002

  Make a bootable CDROM.

• August 2002

  Fix crash dumps. Fix Realtek 8139 driver (thanks to Tim Robinson).

Thought I might log some recent stuff

• February thru April 2004

  Develop EMMY emulator. I did this mostly to teach myself C++ but then it took on a life of its own.

• May and June 2004

  Develop usermode source/symbolic debugger utility. It is very GDB-like except for one aspect. It takes about 80K instead of well over 1.5Meg. Granted, it only does ELF-format x86 executables, but what do you want from something that's about 1/20th the size?

• July and August 2004

  Port to run under XEN virtual machine system from University of Cambridge